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- Kutikula (12)
- Lymphom (12)
- Magnetische Kernresonanz (12)
- Medienkompetenz (12)
- Metastase (12)
- Modell (12)
- Monitoring (12)
- NFAT (12)
- Nanostrukturiertes Material (12)
- Netzhaut (12)
- Nigeria (12)
- Non-Hodgkin-Lymphom (12)
- Onkogen (12)
- PCR (12)
- PRRT (12)
- Pharmakologie (12)
- Pilzkörper (12)
- Polytrauma (12)
- Psychiatrie (12)
- Quality of Experience (12)
- Quantenchemie (12)
- Rekonstruktion (12)
- Religion (12)
- Replikation (12)
- Risikofaktor (12)
- Rotatorenmanschette (12)
- Ruthenium (12)
- SMN (12)
- SNP (12)
- Schule (12)
- Siliciumorganische Verbindungen (12)
- Spracherwerb (12)
- Supraleitung (12)
- Toll-like-Rezeptoren (12)
- Tumor-Nekrose-Faktor <alpha> (12)
- Ubiquitin (12)
- Ultrakurzer Lichtimpuls (12)
- Validierung (12)
- Westafrika (12)
- Zelladhäsion (12)
- age (12)
- amygdala (12)
- antibody (12)
- biofabrication (12)
- blood–brain barrier (12)
- carbenes (12)
- catalysis (12)
- colorectal carcinoma (12)
- complications (12)
- database (12)
- dementia (12)
- drug delivery (12)
- dynamics (12)
- electronic properties and materials (12)
- emotions (12)
- endothelium (12)
- enzyme replacement therapy (12)
- genome (12)
- genomics (12)
- head and neck cancer (12)
- heart rate (12)
- hypoxia (12)
- interaction (12)
- malignant hyperthermia (12)
- measles (12)
- meiosis (12)
- microarray (12)
- microbiome (12)
- molecular beam epitaxy (12)
- molecular biology (12)
- monoclonal antibodies (12)
- neuropathy (12)
- oncology (12)
- optimization (12)
- pollen (12)
- polymers (12)
- proteomics (12)
- rats (12)
- recombination (12)
- review (12)
- screening (12)
- synaptic plasticity (12)
- systematic review (12)
- thrombosis (12)
- tinnitus (12)
- topological insulator (12)
- total knee arthroplasty (12)
- trabeculectomy (12)
- ubiquitin (12)
- ultrasound (12)
- vitamin D (12)
- vorsprachliche Entwicklung (12)
- water oxidation (12)
- zebrafish (12)
- ++ (11)
- 3D (11)
- Alzheimer’s disease (11)
- Anorexia nervosa (11)
- Antigen CD8 (11)
- Arabidopsis (11)
- Arzneimittelüberwachung (11)
- Atherosclerosis (11)
- B-Zelle (11)
- Bakterielle Infektion (11)
- Bioisosterie (11)
- Biosynthese (11)
- Bioverfügbarkeit (11)
- Blazar (11)
- Bruchpilot (11)
- CRISPR/Cas9 (11)
- Chromatin (11)
- Computertomografie (11)
- Durchflusscytometrie (11)
- Dynamik (11)
- Elektronentransfer (11)
- Epidemiologie (11)
- Epidermaler Wachstumsfaktor-Rezeptor (11)
- Flavonoide (11)
- Fließverhalten (11)
- Fotovoltaik (11)
- Genom (11)
- Geschlecht (11)
- Hypoxie (11)
- Immuncytochemie (11)
- Immunology (11)
- Japankärpfling (11)
- Knochen (11)
- Knochenersatz (11)
- Kolorektales Karzinom (11)
- LASP1 (11)
- LPS (11)
- Laser (11)
- Längsschnittuntersuchung (11)
- MS (11)
- Mais (11)
- Mathematik (11)
- Megakaryozyt (11)
- Mensch-Maschine-Kommunikation (11)
- Mesenchymale Stammzellen (11)
- Mesenchymzelle (11)
- Model (11)
- Multiple Myeloma (11)
- NIRS (11)
- Nanodiamant (11)
- Neuropathie (11)
- Niereninsuffizienz (11)
- Operation (11)
- Osteoinduktion (11)
- Parasit (11)
- Parathormon (11)
- Perylenbisimid (11)
- Phylogenie (11)
- Proteaseinhibitor (11)
- Proteasen (11)
- Pulmonale Hypertonie (11)
- Quality of life (11)
- Quanten-Hall-Effekt (11)
- Reperfusion (11)
- Risikofaktoren (11)
- Salmonella (11)
- Schizophrenia (11)
- Schlafapnoe (11)
- Schließzelle (11)
- Schultergelenk (11)
- Schädel-Hirn-Trauma (11)
- Silicate (11)
- Skala (11)
- Small RNA (11)
- Sprache (11)
- Squark (11)
- Stammzellen (11)
- Sterblichkeit (11)
- Symbiose (11)
- T cell (11)
- TWEAK (11)
- Training (11)
- Transplantat-Wirt-Reaktion (11)
- Tuberkelbakterium (11)
- USA (11)
- Vasodilatator-stimuliertes Phosphoprotein (11)
- Wahrnehmung (11)
- X-ray crystallography (11)
- Zelltod (11)
- adhesion (11)
- allergy (11)
- atrial fibrillation (11)
- biocompatibility (11)
- biofilm (11)
- cancer treatment (11)
- cell adhesion (11)
- cochlear implant (11)
- communication (11)
- coping (11)
- dosimetry (11)
- emotion regulation (11)
- fatigue (11)
- fear (11)
- fluorescence microscopy (11)
- glioblastoma multiforme (11)
- immunology (11)
- kinetics (11)
- lung (11)
- mechanism (11)
- membrane proteins (11)
- microglia (11)
- molecular dynamics (11)
- molecular imaging (11)
- nervous system (11)
- neural networks (11)
- neuroendocrine tumor (11)
- next generation sequencing (11)
- nuclear envelope (11)
- oncolytic virus (11)
- periodontitis (11)
- plasticity (11)
- pollination (11)
- randomized controlled trial (11)
- reactive oxygen species (11)
- relapse (11)
- safety (11)
- signaling (11)
- tight junctions (11)
- transport (11)
- tumor microenvironment (11)
- university (11)
- Alkohol (10)
- Alzheimer's disease (10)
- Antigen CD28 (10)
- BERA (10)
- BMP-2 (10)
- Bacteria (10)
- Beschichtung (10)
- Bildverarbeitung (10)
- Bioinformatics (10)
- Biokompatibilität (10)
- Borole (10)
- Cadherine (10)
- Calciumphosphate (10)
- Carbene (10)
- Children (10)
- Chronische Niereninsuffizienz (10)
- Churritisch (10)
- Cochlear-Implantat (10)
- Computational chemistry (10)
- Coronaviren (10)
- Covid-19 (10)
- Cyclo-GMP (10)
- Depressivität (10)
- Diamant (10)
- Digital Humanities (10)
- Dimerisierung (10)
- Dotierung (10)
- Echokardiographie (10)
- Eierstockkrebs (10)
- Elektrochemie (10)
- Elektronenkorrelation (10)
- Englisch (10)
- Enzyminhibitor (10)
- Erbkrankheit (10)
- Ereigniskorreliertes Potenzial (10)
- Erwachsener (10)
- Franken (10)
- Frau (10)
- Funktionalisierung <Chemie> (10)
- Funktionelle Kernspintomografie (10)
- Förderung (10)
- Geldpolitik (10)
- Glatter Krallenfrosch (10)
- Grenzfläche (10)
- HSM-Satztest (10)
- Herzmuskelzelle (10)
- Honigbiene (10)
- Hypophosphatasie (10)
- Impfstoff (10)
- Induzierte pluripotente Stammzelle (10)
- Interleukin 4 (10)
- JNK (10)
- Klassifikation (10)
- Kleinsatellit (10)
- Kniegelenk (10)
- Kohlenstoff (10)
- Kommunikation (10)
- Komplikation (10)
- Kooperation (10)
- Kultur (10)
- LC-MS (10)
- Ladungstransfer (10)
- Ligand (10)
- Lokalisation (10)
- Magnesiumphosphate (10)
- Magnetismus (10)
- Mathematikunterricht (10)
- Mathematisches Modell (10)
- Medulloblastom (10)
- Metakognition (10)
- Metallocene (10)
- Methylphenidat (10)
- Mikrokerne (10)
- Musik (10)
- Mutagenität (10)
- Nahrungserwerb (10)
- Nebennierenrindenkarzinom (10)
- Neolithikum (10)
- Neuropathischer Schmerz (10)
- Niger (10)
- Osteosynthese (10)
- PD-1 (10)
- Pain (10)
- Panikstörung (10)
- Parodontitis (10)
- Pathogenität (10)
- Platelets (10)
- Plattenepithelkarzinom (10)
- Prevalence (10)
- Prostaglandine (10)
- Präfrontaler Cortex (10)
- Psychotherapie (10)
- Pädagogik (10)
- Qualitätskontrolle (10)
- RNA interference (10)
- RNA-seq (10)
- RNS-Spleißen (10)
- Radiotherapy (10)
- Remote Sensing (10)
- Rhodium (10)
- Rituximab (10)
- SAR (10)
- Schilddrüse (10)
- Sentinel-1 (10)
- Silaanaloga (10)
- Silber (10)
- Silicon (10)
- South Africa (10)
- Sprachverstehen (10)
- Staphylococcus (10)
- Starke Kopplung (10)
- Stickstoffmonoxid-Synthase (10)
- Stressreaktion (10)
- Stroke (10)
- Struktur (10)
- T-Lymphozyten (10)
- T-Lymphozyten-Rezeptor (10)
- Tagesrhythmus (10)
- Theologie (10)
- Totalsynthese (10)
- Toxizität (10)
- Transthorakale Echokardiographie (10)
- Treg (10)
- Trypanosomen (10)
- Verwaltungsrecht (10)
- Vitamin D (10)
- Vor- und Frühgeschichte (10)
- Vorschulkind (10)
- Wachstum (10)
- Zebrabärbling (10)
- agriculture (10)
- aldosterone (10)
- amino acids (10)
- antimicrobial resistance (10)
- bariatric surgery (10)
- bioinformatics (10)
- biosynthesis (10)
- boranes (10)
- cancer therapy (10)
- chemokines (10)
- chronic heart failure (10)
- circadian rhythms (10)
- clinical trial (10)
- collagen (10)
- comparison (10)
- complex (10)
- coronary artery disease (10)
- cortisol (10)
- decision-making (10)
- density functional calculations (10)
- eNOS (10)
- education (10)
- genome-wide association (10)
- global change (10)
- glycine receptor (10)
- human behaviour (10)
- hydrogels (10)
- immunomodulation (10)
- induced pluripotent stem cells (10)
- injury (10)
- insect (10)
- knockout (10)
- leaf-cutting ants (10)
- leukemia (10)
- lymph nodes (10)
- mapping (10)
- membrane potential (10)
- motivation (10)
- near-infrared spectroscopy (10)
- neuroscience (10)
- oncolytic virotherapy (10)
- oxidativer Stress (10)
- phenotype (10)
- psychiatric disorders (10)
- quality assurance (10)
- regulatorische T-Zellen (10)
- remodeling (10)
- senescence (10)
- silicon (10)
- social interaction (10)
- stem cell transplantation (10)
- tDCS (10)
- transcriptomics (10)
- tumors (10)
- vaccination (10)
- vertigo (10)
- walking (10)
- Östrogene (10)
- 3 (9)
- Adenosin (9)
- Adenosine receptors (9)
- Affekt (9)
- Afrika (9)
- Alps (9)
- Analyse (9)
- Angeregter Zustand (9)
- Anxiety (9)
- Aorta (9)
- Aortenstenose (9)
- Autophagie (9)
- Bauchspeicheldrüsenkrebs (9)
- Beyond Standard Model (9)
- Biotransformation (9)
- Bordetella pertussis (9)
- Borylierung (9)
- Boğazkale (9)
- Butyrat (9)
- CT (9)
- Carcinogenese (9)
- Catalysis (9)
- Chiralität <Chemie> (9)
- Cloud Computing (9)
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- Dendritic cells (9)
- Diagnose (9)
- Diborane (9)
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- Dünndarm (9)
- Einzelphotonenemission (9)
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- Elektronenmikroskopie (9)
- Elektronenstruktur (9)
- Elementarteilchenphysik (9)
- Epithel (9)
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- Fibromyalgie (9)
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- Frühgeborene (9)
- GIS (9)
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- IL-4 (9)
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- Jugendliche (9)
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- Knorpel (9)
- Konflikt (9)
- Koordinationslehre (9)
- Korpus <Linguistik> (9)
- LC-MS/MS (9)
- Landsat (9)
- Leber (9)
- Linguistik (9)
- Löslichkeit (9)
- MAPK (9)
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- PD-L1 (9)
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- Revision (9)
- Sarkoidose (9)
- Satellit (9)
- Schmalwand <Arabidopsis> (9)
- Schwindel (9)
- Schüttgut (9)
- Spin-Bahn-Wechselwirkung (9)
- Squaraine (9)
- Stathmin (9)
- Stereoselektive Synthese (9)
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- adolescence (9)
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- M-1240-2017 (1)
- N-2030-2015 (1)
Malaria still persists as one of the deadliest infectious disease in addition to AIDS and tuberculosis. lt is a leading cause of high mortality and morbidity rates in the developing world despite of groundbreaking research on global eradication of the disease initiated by WHO, about half a century ago. Lack of a commercially available vaccine and rapid spread of drug resistance have hampered the attempts of extinguishing malaria, which still leads to an annual death toll of about one million people. Resistance to anti-malarial compounds thus renders search for new target proteins imperative. The kinome of the human malaria parasite Plasmodium falciparum comprises representatives of most eukaryotic protein kinase groups, including kinases which regulate proliferation and differentiation processes. Several reports till date have suggested involvement of parasite kinases in the human host and as well as in the mosquito vector. Kinases essential for life cycle stages of the parasite represent promising targets for anti-malarial compounds thus, provoking characterization of additional malarial kinases. Despite extensive research on most plasmodial enzymes, very little information is available regarding the four identified members of the cyclin dependent kinase like kinase (CLK) family. Thus, the present thesis dealt with the functional characterization of four members of the PfCLK kinase family of the parasite denoted as PfCLK-1/Lammer, PfCLK-2, PfCLK-3 and PfCLK-4 with a special focus on the first two kinases. Additionally, one Ca2+/Calmodulin dependent putative kinase-related protein, PfPKRP, presumed to be involved in sexual stage development of the parasite, was investigated for its expression in the life cycle of the parasite. In other eukaryotes, CLK kinases regulate mRNA splicing through phosphorylation of Serine/Arginine-rich proteins. Transcription analysis revealed abundance of PfCLK kinase genes throughout the asexual blood stages and in gametocytes. By reverse genetics approach it was demonstrated that all four kinases are essential for completion of the asexual replication cycle of P. falciparum. PfCLK 1/Lammer possesses two nuclear localization signals and PfCLK-2 possesses one of these signals upstream of the C-terminal catalytic domains. Protein level expression and sub-cellular localization of the two kinases was determined by generation of antiserum directed against the kinase domains of the respective kinase. Indirect immunofluorescence, Western blot and electron microscopy data confirm that the kinases are primarily localized in the parasite nucleus, and in vitro assays show that both enzymes are associated with phosphorylation activity. Finally, mass spectrometric analysis of co immunoprecipitated proteins shows interactions of the two PfCLK kinases with proteins, which have putative nuclease, phosphatase or helicase functions. PfPKRP on the other hand is predominantly expressed during gametocyte differentiation as identified from transcriptional analysis. Antiserum directed against the catalytic domain of PfPKRP detected the protein expression profile in both asexual and gametocyte parasite lysates. Via immunofluorescence assay, the kinase was localized in the parasite cytoplasm in a punctuated manner, mostly in the gametocyte stages. Reverse genetics resulted in the generation of PfPKRP gene-disruptant parasites, thus demonstrating that unlike CLK kinases, PfPKRP is dispensable for asexual parasite survival and hence might have crucial role in sexual development of the parasite. On one hand, characterization of PfCLK kinases exemplified the kinases involved in parasite replication cycle. Successful gene-disruption and protein expression of PfPKRP kinase on the other hand, demonstrated a role of the kinase in sexual stage development of the parasite. Both kinase families therefore, represent potential candidates for anti-plasmodial compounds.
Streptococcus pneumoniae (pneumococci) are Gram-positive bacteria and commensals of the nasopharyngeal cavity. Besides colonization, pneumococci are responsible for severe local infections such as otitis media, sinusitis and life-threatening invasive diseases, including pneumonia, sepsis and meningitis. The surface of pneumococci is decorated with proteins that are covalently or non-covalently anchored to the cell wall. The most unique group of cell wall associated proteins in pneumococci are the choline-binding proteins (CBPs). PspC, also known as SpsA or CbpA, is a multifunctional choline-binding protein that plays an essential role in pneumococcal pathogenesis by functioning as an adhesin. PspC promotes adherence of pneumococci to mucosal epithelial cells by interacting in a human specific manner with the free secretory component (SC) or to SC as part of the secretory IgA (SIgA) or polymeric immunoglobulin receptor (pIgR). PspC also interacts specifically with the soluble complement Factor H. Apparently, PspC uses two different epitopes for binding the soluble host protein Factor H and SC of pIgR. However, the mechanism by which these independent interactions facilitate pneumococcal infections under physiological and host specific conditions have not yet been completely elucidated. This study aims to explore the impact of the PspC interaction with human pIgR (hpIgR) or complement regulator Factor H on pneumococcal virulence. Here the cellular and molecular basis of PspC-mediated adherence to and invasion of host epithelial and endothelial cells was demonstrated. The genetic approach, specific pharmacological inhibitors and immunoblot analysis demonstrated the complexity of the induced signal transduction pathways during PspC-hpIgR mediated pneumococcal uptake by host cells. Inhibition studies with specific inhibitors of actin cytoskeleton and microtubules demonstrated that the dynamics of host cell cytoskeleton are essential for pneumococcal uptake by mucosal epithelial cells. Moreover, this study reports for the first time that the small GTPase Cdc42 is essential for pneumococcal internalization into epithelial cells via the PspC-hpIgR mechanism. In addition, in infection experiments performed in presence of specific inhibitors of PI3-kinase/Akt and protein tyrosine kinase (PTKs), hpIgR-mediated pneumococcal uptake by host cells was significantly blocked. Amongst PTKs the Src kinase pathway, ERK1/2 and JNK pathways were implicated during pneumococcal ingestion by hpIgR expressing cells. In addition, inhibition experiments performed in the presence of individual inhibitors or with a combination of inhibitors suggested the independent activation of PI3-kinase/Akt and Src kinase pathways during pneumococcal infections of hpIgR expressing cells. By employing specific inhibitors and siRNA in cell culture infection experiments it was further demonstrated that pneumococcal endocytosis by host epithelial cells via the PspC-hpIgR mechanism depends on clathrin and dynamin. PspC recruits also Factor H to the pneumococcal cell surface. Consequently, the impact of pneumococcal cell surface bound Factor H on adherence to host cells and the molecular mechanism facilitating the uptake of Factor H bound pneumococci by epithelial cells was investigated. Flow cytometry and immunoblots revealed that S. pneumoniae has evolved the ability to recruit both purified Factor H as well as Factor H from human plasma or serum. Moreover, it was demonstrated that the recruitment of Factor H is independent of the PspC-subtypes and that capsular polysaccharide (CPS) interferes with its recruitment. Factor H bound to pneumococci significantly increased bacterial attachment to and invasion of host epithelial cells including nasopharyngeal cells (Detroit562), lung epithelial cells (A549), and human brain-derived endothelial cells (HBMEC). Blocking experiments demonstrated that bacteria bound Factor H interacts via the heparin binding sites on Factor H with eukaryotic cell surface glycosaminoglycans and that this interaction promotes pneumococcal adherence to host cells. In addition, inhibition studies with mAbs recognizing specifically different short consensus repeats (SCR) of Factor H suggested that SCR 19-20 of Factor H are essential for the pneumococcal interaction with host epithelial cells via Factor H. In the presence of Factor H, attachment of pneumococci to human polymorphonuclear leukocytes (PMNs) is enhanced. The integrin CD11b/CD18 was identified as the cellular receptor on PMNs. By using pharmacological inhibitors the impact of host cell cytoskeleton and signalling molecules, such as PTKs and PI3-kinase, for Factor H-mediated pneumococcal internalization into eukaryotic cells was shown. Taken together, the results revealed that Factor-H mediated pneumococcal infection requires a concerted role of host epithelial cell surface glycosaminoglycans, integrins and host cell signalling pathways.
Insights;
(2023)
The cluster of texts assembled here were imagined, crafted, and brought together as a collaborative writing project that emerged from the seminar titled "Words Matter Worlds: Activist Scholarship and Literary Praxis," which convened over the course of the 2021/22 winter semester as an offering of the American Studies department of the Julius-Maximilians-Universität Würzburg. Like the seminar that nurtured the considerations that evolve here, these contributions engage with how scholarly writing practices in general, and literary and cultural studies in particular, can remake the world.
Der Gram-positive Erreger Staphylococcus aureus ist ein Bestandteil der normalen Haut und Schleimhautflora des Menschen, kann aber auch ein weites Spektrum von Krankheitsbildern hervorrufen. Ein besonderes Charakteristikum dieses Pathogens besteht in der Expression von Oberflächenstrukturen, welche eine hohe Affinität für Proteine der extrazellulären Matrix (ECM) von eukaryontischen Organismen aufweisen und die kollektiv als MSCRAMM (microbial surface components recognizing adhesive matrix molecules) bezeichnet werden. Das auf der Bakterienoberfläche gebundene Fn kann in der Folge als eine Art molekulare Brücke zwischen FnBP exprimierenden S. aureus und dem Fn-Rezeptor auf der Wirtszellseite, dem Integrin 51, dienen. Neben der Anheftung an das Wirtsgewebe kann die indirekte Assoziation mit Integrin 51 die Aufnahme der Bakterien durch die eukaryontische Zelle auslösen. Wie die bakterielle Adhäsion an Integrin 51 und die Aggregation der Integrine durch die mit Fn-beschichteten Bakterien in ein Signal zur Aufnahme der Pathogene durch die Zelle umgesetzt wird, ist nicht vollständig geklärt und sollte im Rahmen dieser Arbeit untersucht werden. Zu diesem Zweck wurde ein neues und effektives Protokoll zur fluoreszenzmikroskopischen Differenzierung von extra- und intrazellulären Bakterien entwickelt. Diese Methode besitzt den Vorteil, von Bakterien-spezifischen Antikörpern unabhängig zu sein. Dadurch bietet sich die Möglichkeit, Bakterien, gegen die es noch keine spezifischen Antiseren gibt, dennoch auf ihre zelluläre Lokalisation und Invasivität mittels mikrobiologischer Methoden untersuchen zu können. Im Hinblick auf die nähere Untersuchung der Signaltransduktion bei der Invasion von S. aureus war die kritische Rolle von Tyrosinkinasen für die Integrin-vermittelte Invasion ein erster wichtiger Hinweis. Diese Befunde führten zu weiteren spezifischeren Untersuchungen, wobei eine wichtige Rolle für Kinasen der Src Familie gezeigt werden konnte. Ein weiterer Hinweis auf die Bedeutung der Src-Kinasen für die Internalisierung von S. aureus war ein dramatischer Rückgang der Aufnahmerate in Src/Yes/Fyn-defizienten Maus-Fibroblasten, verglichen mit Src-rekonstituierten Zellen. Auf biochemischer Ebene konnte eine deutliche Aktivierung der Src-Kinase nach einer Infektion mit S. aureus, nicht aber nach Infektion mit dem nicht-pathogenen S. carnosus festgestellt werden. Integrin-reiche fokale Kontakte (FK) sind angereichert mit Proteinen wie Talin, Vinculin, Paxillin, Tensin, -Actinin oder Zyxin sowie Signalenzymen wie der Fokalen Adhäsions Kinase (FAK) oder Kinasen der Src Familie. Die Protein Tyrosin Kinase (PTK) FAK ist nach Integrinstimulierung eines der Schlüsselenzyme in FK. Dies war der Anlass nach der Bedeutung von FAK für die Integrin-vermittelte Internalisierung von S. aureus zu fragen. Ebenfalls ein wichtiger Hinweis waren die starken Rekrutierungen von Markerproteinen von fokalen Komplexen zum Ort von zellgebunden S. aureus nicht aber von S. carnosus. Daraufhin wurde mittels dominant-negativer FAK-Mutanten und FAKdefizienter Mausfibroblasten der Einfluss von FAK für die Internalisierung von S. aureus untersucht. Bei beiden Versuchsansätzen konnte ein starker Rückgang der Aufnahme beobachtet werden. Zusammengefasst bestätigten diese Ergebnisse die essentielle Rolle von FAK für die Integrin vermittelte Aufnahme der pathogenen S. aureus. Bei der Reorganisation des Aktin-Zytoskeletts spielen eine Reihe von Proteinen eine wichtige Rolle, darunter auch Cortactin. Cortactin ist ein bekanntes Substrat der Src-Kinasen und es lag nahe, nach einer funktionellen Verbindung von Src, FAK und Cortactin zu suchen. Dominant-negative Cortactin-Mutanten, die keine Assoziation mit dem Arp2/3 Komplex oder mit Dynamin aufweisen, oder welche die von Src-vermittelte Phosphorylierung am C-Terminus verhindern, blockierten die Aufnahme von S. aureus. Mikroskopisch konnte eine starke Rekrutierung von Cortactin zu zellgebundenen S. aureus beobachtet werden, jedoch wurde die Rekrutierung nicht von FAK beeinflusst. Die Phosphorylierung von Cortactin aufgrund S. aureus-Infektion war allerdings FAK- und Src-abhängig. Diese Ergebnisse legen nahe, dass ine bisher unbeschriebene FAK/Src Cortactin Signalachse für die Regulation der Integrin-Internalisierung verantwortlich ist. Die detaillierten Untersuchungen der rezeptorvermittelten Aufnahme und der dabei induzierten Signaltransduktion in Wirtszellen gaben neue Erkenntnisse über die Pathogenitätsstrategien von S. aureus. Darüber hinaus ermöglichen diese Arbeiten neue Einblicke in die molekularen Vorgänge, welche die Internalisierung von Integrinen steuern.
Eine Dysbalance zwischen regulatorischen und proinflammatorischen T-Helferzellen kann zu Autoimmunerkrankungen führen. In dieser methodischen Arbeit wurde die Polarisierbarkeit von peripheren T-Lymphozyten durch verschiedene Zytokin-Stimuli untersucht. Hauptziel war es, CD4+CD25-CD127- Lymphozyten durch Stimulation mit einem IL-2 und TGFβ-beinhaltenden Zytokin-Cocktail (Treg-Cocktail) zu iTregs zu polarisieren und deren Suppressionsfunktion auf autologe Effektor-Leukozyten zu untersuchen.
Es erfolgte eine Phänotypisierung der PBMCs gesunder Probanden, insbesondere im Hinblick auf die Verteilung der T-Lymphozyten-Subpopulationen, deren Zytokinproduktion und FoxP3-Expression. Zudem wurden aus den PBMCs der Probanden Tregs (CD4+CD25+CD127low/-) sowie CD4+CD25-CD127- Zellen isoliert und deren Funktionsfähigkeit durch die Untersuchung ihrer Suppressionsfunktion auf autologe Effektor-Lymphozyten analysiert. Die Zellen wurden mittels verschiedener Zytokin-Cocktails in Richtung Treg sowie in Richtung Th17-Zellen polarisiert; anschließend wurde die Funktionsfähigkeit der polarisierten Zellen in Suppression-Assays gemessen.
Wir konnten zeigen, dass die CD4+CD25+CD127low/- Zellen Tregs mit der Fähigkeit zur Suppression der Proliferation autologer Effektor-Lymphozyten waren. Bei den CD4+CD25-CD127-Zellen handelte es sich um T-Lymphozyten ohne Suppressionsfunktion. Nach Stimulation der CD4+CD25-CD127-Zellen mit dem Treg-Cocktail zeigten die Zellen eine mit den Tregs vergleichbare Suppressionsfunktion.
Mit dieser Studie haben wir eine aktuelle methodische Quelle für die Untersuchung von Phänotyp und Funktion regulatorischer T-Zellen sowie für die Stimulation peripherer T-Lymphozyten hin zu Tregs geschaffen, die als Basis für Folgeversuche dienen soll, in denen Zellen von Patienten mit Autoimmunkrankheiten untersucht werden sollen. Da sich die Inflammation bei Autoimmunerkrankungen insbesondere in den betroffenen Geweben abspielt, wäre eine Studie anzustreben, in der aus dem Blut isolierte T-Lymphozyten den Zellen aus den entzündeten Geweben gegenübergestellt werden. Ergänzend sollte eine Phänotypisierung der Tregs und der CD4+CD25-CD127- Zellen nach der Zytokin-Stimulation erfolgen.
Zusammenfassend konnte die Plastizität peripherer T-Lymphozyten in Richtung Treg gezeigt werden. Besonders hervorzuheben ist die bislang wenig untersuchte Zellpopulation der CD4+CD25-CD127- Zellen, die eine vielversprechende Zellpopulation für die in vitro Induktion von Tregs darstellt.
A liquid chromatography tandem mass spectrometry method for the analysis of ten kinase inhibitors (afatinib, axitinib, bosutinib,cabozantinib, dabrafenib, lenvatinib, nilotinib, osimertinib, ruxolitinib, and trametinib) in human serum and plasma for theapplication in daily clinical routine has been developed and validated according to the US Food and Drug Administration andEuropean Medicines Agency validation guidelines for bioanalytical methods. After protein precipitation of plasma samples withacetonitrile, chromatographic separation was performed at ambient temperature using a Waters XBridge® Phenyl 3.5μm(2.1×50 mm) column. The mobile phases consisted of water-methanol (9:1, v/v) with 10 mM ammonium bicarbonate as phase A andmethanol-water (9:1, v/v) with 10 mM ammonium bicarbonate as phase B. Gradient elution was applied at a flow rate of 400μL/min. Analytes were detected and quantified using multiple reaction monitoring in electrospray ionization positive mode. Stableisotopically labeled compounds of each kinase inhibitor were used as internal standards. The acquisition time was 7.0 min perrun. All analytes and internal standards eluted within 3.0 min. The calibration curves were linear over the range of 2–500 ng/mLfor afatinib, axitinib, bosutinib, lenvatinib, ruxolitinib, and trametinib, and 6–1500 ng/mL for cabozantinib, dabrafenib, nilotinib,and osimertinib (coefficients of correlation≥0.99). Validation assays for accuracy and precision, matrix effect, recovery,carryover, and stability were appropriate according to regulatory agencies. The rapid and sensitive assay ensures high throughputand was successfully applied to monitor concentrations of kinase inhibitors in patients.
Die Ergebnisse von bisherigen neuropathologischen Studien konnten die wichtige Bedeutung bestimmter Hirnstammareale bei der Pathogenese der Alzheimer-Erkrankung belegen. Zu diesen Strukturen gehören vor allem die Vaguskerngebiete, die in Anbetracht der zeitlich-topographischen Entwicklungsdynamik der AD als frühe Prädilektionsstellen für die Alzheimer-typischen Pathologien fungieren könnten. Eine Ausbreitung dieser Pathologie nach kranial, wie etwa ins limbische System und in andere kortikale Hirnregionen, erfolgt erst in späteren Krankheitsstadien. Deshalb wäre es im Hinblick auf die Früherkennung einer AD von großem diagnostischem Nutzen, eine geeignete nicht-invasive Methode zum Nachweis der Hirnstammaffektion zu entwickeln. Diese könnte insbesondere im Rahmen eines Screeningprogrammes für MCI-Patienten, die ohnehin ein stark erhöhtes Risiko für Entwicklung einer AD aufweisen, eingesetzt werden. In Anbetracht solcher makroskopisch oft nicht sichtbarer pathologischer Veränderungen im Hirnstamm, die meist der Nachweisbarkeit durch die strukturelle moderne Bildgebung entgehen, ist die Technik der Vagus-evozierten Potentiale (VSEP) wegen ihrer exzellenten zeitlichen Auflösung möglicherweise in der Lage, durch Erfassung der Funktionsstörungen der Vagus-Kerngebiete, eine Affektion dieser Strukturen festzustellen. Eine solche Funktionsstörung sollte sich dann als eine Latenzverzögerung der Potentiale darstellen.
Zu diesem Zweck wurden in dieser Arbeit insgesamt 52 Personen (13 Alzheimer-Patienten, 12 MCI-Patienten und 27 gesunden Probanden) in einer ersten Sitzung neuropsychologisch und in der zweiten Sitzung elektrophysiologisch untersucht, wobei in der ersten Sitzung zusätzlich eine ausführliche Anamnese erhoben wurde. In der zweiten Sitzung wurde dann nach elektrischer Stimulation des Hautastes des N. Vagus am äußeren Gehörgang auf beiden Seiten mittels 2 haardünnen Kupferdrähten, jeweils die VSEP in Form der Fernfeldpotentiale über EEG-Elektroden abgeleitet.
Die Stimulation erfolgte analog zu den vorangegangenen Arbeiten mit einer Stimulationsstärke von 8mA, einer Stimulationsdauer von 0,1 msec und einem Interstimulusintervall von 2 sec, zuerst auf der rechten und danach auf der linken Seite mit 100 Wiederholungen pro Seite, wobei nach 50 artefaktfreien Kurven in einer Stimulationspause von 5 sek. die Stimulationselektroden in ihrer Polarisierung manuell gedreht wurden. Da es bisher keine Standarddefinition für die frühestmögliche Latenz (P1) bei der Ableitung der VSEP existiert, wurde in dieser Arbeit die Auswertung der VSEP mit zwei Methoden durchgeführt, wobei die erste Latenz P1 im ersten Ansatz abhängig und im zweiten Ansatz unabhängig von der Potentialamplitude definiert wurde. Demnach konnten je nach Analysemethode unterschiedliche Anzahlen an auswertbaren Potentialkurven eingeschlossen werden.
Die dieser Arbeit zugrunde liegende Hypothese, dass die VSEP bei Alzheimer-Patienten sich gegenüber MCI-Patienten und Kontrollpersonen durch eine Latenzverzögerung kennzeichnen, konnte in der primären statistischen Auswertung mittels Bi- und Univarianzanalyse (3x2 und 3x1 ANOVA) nicht bestätigt werden, und zwar weder im amplitudenabhängigen noch im amplitudenunabhängigen Modul. Eine der möglichen Erklärungen hierfür ist die geringe Anzahl an untersuchten Patienten, sodass die zukünftigen Studien mit größeren Subgruppen erfolgen sollen. Erst nach statistischer Analyse von hemisphärenspezifischen Mittelwerten und zwar nur für die rechte Hemisphäre konnte ausschließlich für P2 in der amplitudenunabhängigen Auswertung ein hypothesenkonformes Ergebnis erreicht werden. Eine Latenzverzögerung in der MCI-Gruppe gegenüber Kontrollpersonen konnte in den statistischen Analysen nicht gezeigt werden.
In der ersten Sitzung wurde bei allen Patienten und Probanden mittels CERAD-Testbatterie der neuropsychologische Status erhoben. Anschließend wurden die Ergebnisse der VSEP aus der amplitudenunabhängigen Auswertung und CERAD miteinander verglichen, woraus sich eine signifikant negative Korrelation zwischen den einzelnen Testabschnitten (Semantische Flüssigkeit, Lernen und Speichern einer Wortliste sowie Figurenabzeichnung) und den Latenzzeiten ergab. Außerdem wurde zwecks Screening und besserem Vergleich mit den Voruntersuchungen im Rahmen der klinischen Betreuung der Patienten, der kurze neuropsychologische Test DemTect durchgeführt.
Für die Weiterentwicklung der Methode der VESP ist es unerlässlich, mittels weiteren Studien die Entwicklung der evozierten Potentiale bei den bereits untersuchten Personen im Verlauf zu beobachten. Die Dynamik der MCI mit erhöhtem Risiko zur Entwicklung einer AD macht es verständlich, dass eine solche Verlaufskontrolle insbesondere in dieser Gruppe sehr erstrebenswert ist. Parallel zu den klinischen Verlaufskontrollen, die in der Gedächtnisambulanz der Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie der Universität Würzburg bei nahezu allen MCI- und AD-Patienten durchgeführt wurden, wurde zur Evaluation der Veränderungen der VSEP für die in dieser Studie eingeschlossenen Patienten ein 12-monatiges Zeitintervall für die Verlaufsmessung der VSEP gewählt. Diese Verlaufsmessung wurde nach dem Abschluss dieser Arbeit von der Arbeitsgruppe von Thomas Polak et al. in der oben genannten Klinik durchgeführt und wird eigenständig beschrieben.
Solche Verlaufskontrollen können es ermöglichen, im Falle des Übergangs der MCI in AD frühzeitig mit aktuellen symptomatischen Behandlungen und insbesondere zukünftig zu entwickelnden neuroprotektiven Therapien zu beginnen. Hierdurch bestehen prinzipiell größere Erfolgsaussichten, die Progression der irreversiblen Nervenzellschädigung im Rahmen der neurodegenerativen Erkrankung zu verlangsamen oder gar aufzuhalten.
G protein-coupled receptor research looks out for new technologies to elucidate the complex
processes of receptor activation, function and downstream signaling with spatiotemporal
resolution, preferably in living cells and organisms. A thriving approach consists in making use
of the unsurpassed properties of light, including its high precision in space and time, noninvasiveness
and high degree of orthogonality regarding biological processes. This is realized
by the incorporation of molecular photoswitches, which are able to effectively respond to light,
such as azobenzene, into the structure of a ligand of a given receptor. The muscarinic
acetylcholine receptors belong to class A GPCRs and have received special attention in this
regard due to their role as a prototypic pharmacological system and their therapeutic potential.
They mediate the excitatory and inhibitory effects of the neurotransmitter acetylcholine and
thus regulate diverse important biological processes, especially many neurological functions in
our brain.
In this work, the application of photopharmacological tool compounds to muscarinic receptors
is presented, consisting of pharmacophores extended with azobenzene as light-responsive
motif. Making use of the dualsteric concept, such photochromic ligands can be designed to bind
concomitantly to the orthosteric and allosteric binding site of the receptor, which is
demonstrated for BQCAAI (M1) and PAI (M2) and may lead to subtype- and functionalselective
photoswitchable ligands, suitable for further ex vivo and in vivo studies.
Moreover, photoswitchable ligands based on the synthetic agonist iperoxo were investigated
extensively with regard to their photochemical behavior and pharmacological profile, outlining
the advantages and challenges of using red-shifted molecular photoswitches, such as tetraortho-
fluoro azobenzene. For the first time on a GPCR it was examined, which impact the
different substitution pattern has on both the binding and the activity on the M1 receptor. Results
show that substituted azobenzenes in photopharmacological compounds (F4-photoiperoxo and
F4-iper-azo-iper) not just represent analogs with other photophysical properties but can exhibit
a considerably different biological profile that has to be investigated carefully.
The achievements gained in this study can give important new insights into the binding mode
and time course of activation processes, enabling precise spatial and temporal resolution of the
complex signaling pathway of muscarinic receptors. Due to their role as exemplary model
system, these findings may be useful for the investigation into other therapeutically relevant
GPCRs.
Die nächtliche (24-stündige) Überwachung des intraokularen Drucks (IOD) bei stationären Glaukompatienten wird in Europa seit mehr als 100 Jahren eingesetzt, um Spitzenwerte zu erkennen, die während der regulären Sprechstundenzeiten übersehen werden. Daten, die diese Praxis unterstützen, fehlen, zum Teil weil es schwierig ist, manuell erstellte IOD-Kurven mit dem objektiven Verlauf des Glaukoms zu korrelieren. Um dieses Problem zu beheben, haben wir automatisierte IOD-Datenextraktionswerkzeuge eingesetzt und auf eine Korrelation mit einem fortschreitenden Verlust der retinalen Nervenfaserschicht auf der optischen Kohärenztomographie im Spektralbereich (SDOCT) getestet.
Background: During early stages of brain development, secreted molecules, components of intracellular signaling pathways and transcriptional regulators act in positive and negative feed-back or feed-forward loops at the mid-hindbrain boundary. These genetic interactions are of central importance for the specification and subsequent development of the adjacent mid-and hindbrain. Much less, however, is known about the regulatory relationship and functional interaction of molecules that are expressed in the tectal anlage after tectal fate specification has taken place and tectal development has commenced.
Results: Here, we provide experimental evidence for reciprocal regulation and subsequent cooperation of the paired-type transcription factors Pax3, Pax7 and the TALE-homeodomain protein Meis2 in the tectal anlage. Using in ovo electroporation of the mesencephalic vesicle of chick embryos we show that (i) Pax3 and Pax7 mutually regulate each other's expression in the mesencephalic vesicle, (ii) Meis2 acts downstream of Pax3/7 and requires balanced expression levels of both proteins, and (iii) Meis2 physically interacts with Pax3 and Pax7. These results extend our previous observation that Meis2 cooperates with Otx2 in tectal development to include Pax3 and Pax7 as Meis2 interacting proteins in the tectal anlage.
Conclusion: The results described here suggest a model in which interdependent regulatory loops involving Pax3 and Pax7 in the dorsal mesencephalic vesicle modulate Meis2 expression. Physical interaction with Meis2 may then confer tectal specificity to a wide range of otherwise broadly expressed transcriptional regulators, including Otx2, Pax3 and Pax7.
Barley stripe mosaic virus (BSMV) RNA which was previously reported to contain poly(A) sequences (Agranovsky et al., 1978) can be specifically esterified with tyrosine in vitro in the presence of an aminoacyl-tRNA synthetase fraction from wheat embryos. All the three RNA components of the BSMV strain with a three-component genome (Norwich) and both RNA components of a two-component strain (Russian) can be tyrosylated. The poly(A)-containing (bound to oligo(dT)-cellulose) and poly(A)-deficient(not bound to oligo(dT)-cellulose) fractions of BSMV RNA display a similar amino acidaccepting ability. The nucleotide sequence which accepts tyrosine is coupled with the intact genomic polyadenylated BSMV RNA. The viral RNA isolated after sucrose density gradient centrifugation under drastic denaturing conditions retains its aminoacylating activity, which suggests that this activity is not due to the presence in a BSMV RNA preparation of a tyrosine tRNA associated with BSMV RNA. Inhibition of aminoacylation of the 3’-oxidized (treated with sodium metaperiodate) BSMV RNA suggests that the tyrosine-accepting structure is localized at the 3’ terminus of BSMV RNA molecules. It is shown that segments of different lengths obtained upon random fragmentation can be tyrosylated. The 3’-terminal (tyrosine-accepting) poly(A)+ segments can be isolated. The shortest segments of viral RNA capable of being aminoacylated [i.e., containing both tRNA-like structure and poly(A)] consists of approximately 150-200 nucleotides. The analysis of the oligonucleotides derived from individual BSMV RNA components labeled with 32P at the 3’ end revealed two types of 3’-terminal sequences different from poly(A). It is suggested that a poly(A) sequence is intercalated between a 3’-terminal tyrosineaccepting structure and the 5’-terminal portion of poly(A)+ BSMV RNA.
Expression of human foamy virus is differentially regulated during development in transgenic mice
(1992)
Tbe human foamy virus (HFV) is a recently characterized member ofthe spumavirus family. Although no diseases have been unequivocally associated with HFV infection, expression of HFV regulatory genes in transgenie mice induces a characteristic aeute neuro degenerative disease and a myopathy. To better eharaeterize the sequenee of events leading to disease, and to gain a better understanding of the underlying pathogenetic meehanisms, we have analyzed in detail the transgene expression pattern during development. Transcription of a construet containing all regulatory elements and aneillary genes of mv was analyzed by in situ hybridization and was shown to occur in two distinct phases. At midgestation, low but widespread expression was first deteeted in eells of extraembryonie tissues. Later, various tissues originating from embryonie mesoderm, neuroeetoderm, and neural erest transeribed the transgene at moderate levels. However, expression deereased dramatically during late gestation and was suppressed shortly after birth. After a latency period of up to 5 weeks, transeription of the transgene resumed in single eelJs distributed irregularly in the central nervous system and in the skeletal museIe. By the age of 8 weeks, an increasing number of eells displayed much higher expression levels than in embryonie Iife and eventually underwent severe degenerative ehanges. These findings demonstrate that HFV transgene expression is differentially regulated in development and that HFV cytotoxicity may be dose-dependent. Such biphasic pattern of expression differs from that of murine retroviruses and may be explained by the specificity of HFV regulatory elements in combination with cellular faetors. Future studies of this model system should, therefore, provide novel insights in the mechanisms controlling retrovirallatency.
Humanfoamy virus (HFV) is a retrovirus encoding structural genes and, like human immunodeficiency virus and human T ceU leukemia virus I, several anciUary reading frames collectively termed the belgenes. We have previously shown that HFV transgenic mice develop an encephalopathy with neuronal loss in hippocampus and cerebral cortex. We have now raised and characterized rabbit antisera to various recombinant portions of gag, pot, env, and bel-I, the viraltransactivator. Immunoreactivity for gag and bel-I was observed in nuclei and processes of hippocampal and cortical neurons before the onset of morphological lesions and correlated with the appearance of HFV mRNA. Astrocyte-derived multinucleated giant ceUs containing HFV proteins were present in the brain oftransgenic mice coexpressingfuU- length HFV genes but not in mice expressing truncated gag and env, suggesting that these genes contain afusogenic domain. Expression of fuU-length structural genes decreased the life expectancy oftransgenic mice, implying an a4Juvant rolefor these proteins in HFV-induced brain damage. (Am] Pathol 1993, 142:1061-1072)
Diese Dissertation enthält eine Edition und eine annotierte Übersetzung des dem Bhasa zugeschriebenen Sanskrit-Schauspiels "Pratijnayaugandharayana". Die Edition beruht auf zehn Manuskripten, von denen bisherige Ausgaben nur drei verwendet hatten. Um Zusammenhänge zwischen den Manuskripten sichtbar zu machen, und so deren jeweiligen Wert besser beurteilen zu können, werden quantitative Methoden verwendet. In diesem Zusammenhang wird die effektive Verwendung von EDV für die Veröffentlichung von Sanskrit-Schauspielen reflektiert. Die vorgestellte Herangehensweise ermöglichte auch die automatische Erstellung des als Anhang enthaltenen Index aller in dem Schauspiel vorkommenden Sanskrit- und Prakrit-Wortformen.
Die Funktionalität β1- und β2-adrenerger Rezeptoren wird durch Polymorphismen in ihrer kodierenden Region moduliert. Wir haben uns die Technik des Fluoreszenz-Resonanz- Energie-Transfers (FRET) zu Nutze gemacht, um den Einfluss der am häufigsten vorkommenden Polymorphismen (Ser49Gly und Gly389Arg im β1AR, Arg16Gly und Gln27Glu im β2AR) auf die Rezeptorkonformation nach Aktivierung zu untersuchen. Dafür wurden FRET-Sensoren für die beiden βAR-Subtypen mit einem gelb-fluoreszierenden Protein (YFP) sowie einem cyan-fluoreszierenden Protein (CFP oder Cerulean) in der dritten intrazellulären Schleife bzw. am C-Terminus verwendet. Nach Stimulierung der βARSensoren konnte die Aktivierung der polymorphen Rezeptorvarianten in lebenden Zellen in Echtzeit untersucht werden. Dabei behielten die FRET-Sensoren sowohl die Bindungsaffinitäten der nativen Rezeptoren als auch eine intakte Funktionalität hinsichtlich der Bildung von sekundären Botenstoffen. Der Vergleich der Aktivierungskinetiken der verschieden polymorphen Varianten des β1AR und β2AR ergab keine signifikanten Unterschiede nach einer einmaligen Stimulation. Es zeigte sich jedoch, dass Rezeptorpolymorphismen die Aktivierungskinetik vorstimulierter βAR erheblich beeinflussen. So konnten wir im Vergleich zur ersten Aktivierung eine schnellere Aktivierung der Gly16-Varianten des β2AR sowie des Gly49Arg389-β1AR feststellen, während die Arg16-β2AR-Variante und der Ser49Gly389-β1AR dagegen bei einer wiederholten Stimulation langsamer aktiviert wurden. Diese Ergebnisse lassen auf ein "Rezeptorgedächtnis" schließen, das spezifisch für bestimmte polymorphe Rezeptorvarianten ist und eine βAR-Subtyp-spezische Ausprägung zeigt. Die Ausbildung der unterschiedlichen Aktivierungskinetiken hing von der Interaktion des Rezeptors mit löslichen intrazellulären Faktoren ab und bedurfte einer Phosphorylierung intrazellulärer Serin- und Threonin-Reste durch G-Protein-gekoppelte Rezeptorkinasen. Die Interaktion mit löslichen intrazellulären Faktoren scheint für den β1AR weniger stark ausgeprägt zu sein als für den β2AR. Die cAMP-Produktion war für die schneller werdenden, “hyperfunktionellen” Gly16-β2ARVarianten signifikant um mehr als 50% höher im Vergleich zur “hypofunktionellen” Arg16- Variante. Die unterschiedliche Funktionalität spiegelte sich im Therapieausgang bei Tokoysepatientinnen wider, dessen Erfolg mit dem Arg16Gly Polymorphismus verknüpft war. Die Daten implizieren eine intrinsische, polymorphismusabhängige Eigenschaft der βAR, die die Aktivierungskinetik der Rezeptoren bei wiederholten Stimulationen determiniert. Diese könnte auch für die zwischen Individuen variierende Ansprechbarkeit auf β-Agonisten und β-Blocker mitverantwortlich sein.
Imprinted genes play important roles in brain development. As the neural developmental capabilities of human parthenogenetic embryonic stem cells (hpESCs) with only a maternal genome were not assessed in great detail, hence here the potential of hpESCs to differentiate into various neural subtypes was determined. In addition DNA methylation and expression of imprinted genes upon neural differentiation was also investigated. The results demonstrated that hpESC-derived neural stem cells (hpNSCs) showed expression of NSC markers Sox1, Nestin, Pax6, and Musashi1 (MS1), the silencing of pluripotency genes (Oct4, Nanog) and the absence of activation of neural crest (Snai2, FoxD3) and mesodermal (Acta1) markers. Moreover, confocal images of hpNSC cultures exhibited ubiquitous expression of NSC markers Nestin, Sox1, Sox2 and Vimentin. Differentiating hpNSCs for 28 days generated neural subtypes with neural cell type-specific morphology and expression of neuronal and glial markers, including Tuj1, NeuN, Map2, GFAP, O4, Tau, Synapsin1 and GABA. hpNSCs also responded to region-specific differentiation signals and differentiated into regional phenotypes such as midbrain dopaminergic- and motoneuron-type cells. hpESC-derived neurons showed typical neuronal Na+/K+ currents in voltage clamp mode, elicited multiple action potentials with a maximum frequency of 30 Hz. Cell depicted a typical neuron-like current pattern that responded to selective pharmacological blockers of sodium (tetrodotoxin) and potassium (tetraethylammonium) channels. Furthermore, in hpESCs and hpNSCs the majority of CpGs of the differentially methylated regions (DMRs) KvDMR1 were methylated whereas DMR1 (H19/Igf2 locus) showed partial or complete absence of CpG methylation, which is consistent with a parthenogenetic (PG) origin. Upon differentiation parent-of-origin-specific gene expression was maintained in hpESCs and hpNSCs as demonstrated by imprinted gene expression analyses. Together this shows that despite the lack of a paternal genome, hpNSCs are proficient in differentiating into glial- and neuron-type cells, which exhibit electrical activity similar to newly formed neurons. Moreover, maternal-specific gene expression and imprinting-specific DNA-methylation are largely maintained upon neural differentiation. hpESCs are a means to generate histocompatible and disease allele-free ESCs. Additionally, hpESCs are a unique model to study the influence of imprinting on neurogenesis.
Parent of origin imprints on the genome have been implicated in the regulation of neural cell type differentiation. The ability of human parthenogenetic (PG) embryonic stem cells (hpESCs) to undergo neural lineage and cell type-specific differentiation is undefined. We determined the potential of hpESCs to differentiate into various neural subtypes. Concurrently, we examined DNA methylation and expression status of imprinted genes. Under culture conditions promoting neural differentiation, hpESC-derived neural stem cells (hpNSCs) gave rise to glia and neuron-like cells that expressed subtype-specific markers and generated action potentials. Analysis of imprinting in hpESCs and in hpNSCs revealed that maternal-specific gene expression patterns and imprinting marks were generally maintained in PG cells upon differentiation. Our results demonstrate that despite the lack of a paternal genome, hpESCs generate proliferating NSCs that are capable of differentiation into physiologically functional neuron-like cells and maintain allele-specific expression of imprinted genes. Thus, hpESCs can serve as a model to study the role of maternal and paternal genomes in neural development and to better understand imprinting-associated brain diseases.
Assessing particle deposition in a representative in vitro model of the rat respiratory tract
(2014)
The aim of this thesis was to develop an in vitro model (IVR) of the rat lung for the purpose of investigating the deposition of drug particles in the rat airways. The model attempted to account for the affect of drug product characteristics and physiological parameters on deposition in the lungs. In addition, the model outputs were compared with in vivo lung deposition results from live rats and in silico predictions using published computer model of lung deposition in pre-clinical species.
Initial work focussed on developing an aerosol exposure system capable of dosing small rodent to a range of airborne test materials. The system consists of two main parts; a fluidised bed aerosol generator and connection of the generator output to a nose only exposure chamber capable of accommodating 12 small animals in a single layer. In addition, an aerodynamic particle spectrometer (APS) was installed for continuously measuring the size distribution and airborne concentration of aerosol particles generated in the exposure chamber. System validation showed acceptable degree of variation of the test material tested, Fluorescent Microspheres (FMS) throughout the exposure chamber (CV < 15.0%). Particle size (MMAD ± GSD) using the APS was shown to be stable throughout the exposure periods.
The IVR model developed in this project was based on a number of euthanased (n=7), female Sprague-Dawley rats (weight: 372 ± 56 g), which underwent high-resolution micro-CT scans. The physical model consisted of five sub sections; Extra-Thoracic region containing the snout and nasophyarynx, trachea-bronchial region containing the trachea, bronchi, and bronchioles. All sections of the model were attached to one another in numerical order and housed within a containment unit. At the rear end of the cast, a flexible diaphragm was attached in order to collect the fraction of inhaled particles exiting the TB section and possibly reaching the lung, referred to as the Post-TB section.
A study was conducted to assess the influence of inhalation parameters such as the breathing frequency and tidal volume on total and regional dose distribution using FMS as test material. The major finding of this study was the demonstration of the model sensitivity to changes in breathing parameters especially respiratory frequency, where the data showed increased deposition in the peripheral regions of the model with decreased respiratory frequency. Other studies assessed the effect of particle characteristics on deposition on the IVR model, such as particle size, dose increase and formulation changes.
The results assessing particle size effect showed a slightly higher deposition levels for the 4µm sized particles versus 2µm sized particles in the head region; 90.8 ± 3.6% and 88.2 ± 6.6%. However, this difference did not reach statistical significance (P> 0.05) probably due to the polydispersity of aerosolised FMS particles. In addition, the regional deposition analysis showed an increased lung peripheral deposition with the smaller particles. In addition, the model was shown to be sensitive to changes in formulation composition mediated by inclusion of MgSt.
The next stage of work was to validate the model in terms of comparison with lung deposition for in vivo rats. For lung deposition comparison, the absolute amount deposited in the IVR lung model (expressed as µg/kg) was shown to have a reasonably strong correlation with in vivo lung concentration measures (µg/kg); R2= 0.66, P < 0.05. Compounds were predicted well and within 2-folds of the measured lung deposition values. However, knowing the variability in biological systems and the multiple components required to estimate lung doses, predictions within 2-fold of the measured values would seem reasonable
In terms of comparison with in silico model predictions using MPPD, similar deposition levels were noted between the two models, particularly when the data was expressed as percentage of total particles inhaled. The data showed the highest deposition levels were noted in the head region (> 80%) and less than 5.0% deposition for the peripheral lung fractions.
With regards to using the IVR model to assess the relationship between dose, particle size and efficacy, an in vivo study using FP with different particle sizes (2.0 and 4.0 µm) but same doses ( 100 and 1000 µg/kg). This study demonstrated that exposure of rat to FP powder resulted in a dose-dependent inhibition of neutrophils in BAL fluids. However, a clear difference in neutrophils suppression was demonstrated for equivalent doses but different particle sizes of FP, where the smaller FP particles (2.0 µm) induced a greater level of neutrophils suppression in comparison with larger FP particles (4.0 µm). In addition, a reasonably good correlation for the relationship between lung deposition in the IVR model and a neutrophils suppression level was demonstrated. Furthermore this data support the hypothesis that regional deposition is an important determinant in efficacy. Therefore, this suggests that the IVR model may be a useful as a tool to describe in vivo efficacy with in vitro data. However, further studies should be conducted to evaluate the validity of this model and relationship.
The IVR model has a number of important limitations. First, the model is based on scans up to generation four of the rat respiratory tract as this represented the limits of the micro-CT scanning technology at the time of this study. Therefore deposition in the deeper region of the lung may not be reflected precisely in the IVR model. Second, the regional deposition data generated using the model tended to show an overestimation of deposition in head region and an underestimation of deposition in the peripheral regions of the lung, in comparison with in vivo lung deposition data. Third, the current model does not take into account lung clearance. However, the amount of the drug present in the in vivo lungs is dependent on numerous physiological processes such as dissolution, passive or active absorption into the systemic circulation, binding to lung tissue and mucociliary clearance. Consequently, the results generated using this IVR model for drug molecules with high lung clearance rate should be treated with some caution.
Future work extending this research could go in a number of directions. In this research, a representative model of the rat respiratory tract was constructed from analysis of imaging data from a number of euthanised Sprague-Dawley rats. This model represented the “average respiratory tract” in terms of dimensions of Sprague-Dawley rats. However, there is considerable variability in the airway dimensions between rats. This variability encompasses a number of factors such as the strains of rats, sex and age, and disease state. Thus, it may be possible to produce a small number of airway models to represent small and large rats and scaled to represent the extrathoracic and peripheral regions based on literature reports of their dimensions in different rat populations. This approach will then enable the effect of intersubject airway dimensions for different rat populations on aerosol deposition to be thoroughly examined.
In addition, due to the limitation of the micro-CT technology used to construct the physical IVR model, detailed morphology only up to generation 4 were captured. However, recent advances in MRI technology, such as the use of in situ-MRI based scanning technology have enabled rat airway morphometry to be extended to 16 airway generation. This coupled with improvements in the resolutions of rapid-prototyping process means it may be possible to construct a rat model that reflects the in vivo lung morphology more accurately, and thus enable greater understanding of the link between aerosol deposition and airway geometry.
In conclusion, a model cast of the rat lung was developed and validated to allow the deposition of inhaled particles in the rat lung to be investigated. The model may be used to estimate the lung concentration in vivo rats in preference to exposure concentration measurements based on filter samples which have been shown to be a poor indicator of the lung concentration immediately after exposure. In addition, the model has the potential to be used along with live rats in an inhalation rig in pulmonary pharmaceutics research and may facilitate in development of inhaled formulations to target specific regions within the lung as well as screening of inhaled drugs in preclinical setting.
In the present report, well-defined WO3 nanorods (NRs) and a rGO–WO\(_3\) composite were successfully synthesized using a one-pot hydrothermal method. The crystal phase, structural morphology, shape, and size of the as-synthesized samples were studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements. The optical properties of the synthesized samples were investigated by Raman, ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy. Raman spectroscopy and TEM results validate the formation of WO\(_3\) (NRs) on the rGO sheet. The value of the dielectric constant (ε′) of WO3 NRs and rGO–WO\(_3\) composite is decreased with an increase in frequency. At low frequency (2.5 to 3.5 Hz), the value of ε′ for the rGO–WO3 composite is greater than that of pure WO\(_3\) NRs. This could be due to the fact that the induced charges follow the ac signal. However, at higher frequency (3.4 to 6.0), the value of ε′ for the rGO–WO\(_3\) composite is less compared to that of the pure WO3 NRs. The overall decrease in the value of ε′ could be due to the occurrence of a polarization process at the interface of the rGO sheet and WO3 NRs. Enhanced interfacial polarization in the rGO–WO\(_3\) composite is observed, which may be attributed to the presence of polar functional groups on the rGO sheet. These functional groups trap charge carriers at the interface, resulting in an enhancement of the interfacial polarization. The value of the dielectric modulus is also calculated to further confirm this enhancement. The values of the ac conductivity of the WO\(_3\) NRs and rGO–WO\(_3\) composite were calculated as a function of the frequency. The greater value of the ac conductivity in the rGO–WO\(_3\) composite compared to that of the WO\(_3\) NRs confirms the restoration of the sp:\(^{++}\) network during the in situ synthesis of the rGO–WO\(_3\) composite, which is well supported by the results obtained by Raman spectroscopy.
Mining biomedical images towards valuable information retrieval in biomedical and life sciences
(2016)
Biomedical images are helpful sources for the scientists and practitioners in drawing significant hypotheses, exemplifying approaches and describing experimental results in published biomedical literature. In last decades, there has been an enormous increase in the amount of heterogeneous biomedical image production and publication, which results in a need for bioimaging platforms for feature extraction and analysis of text and content in biomedical images to take advantage in implementing effective information retrieval systems. In this review, we summarize technologies related to data mining of figures. We describe and compare the potential of different approaches in terms of their developmental aspects, used methodologies, produced results, achieved accuracies and limitations. Our comparative conclusions include current challenges for bioimaging software with selective image mining, embedded text extraction and processing of complex natural language queries.
The composition of stable-isotope labelled isotopologues/isotopomers in metabolic products can be measured by mass spectrometry and supports the analysis of pathways and fluxes. As a prerequisite, the original mass spectra have to be processed, managed and stored to rapidly calculate, analyse and compare isotopomer enrichments to study, for instance, bacterial metabolism in infection. For such applications, we provide here the database application ‘Isotopo’. This software package includes (i) a database to store and process isotopomer data, (ii) a parser to upload and translate different data formats for such data and (iii) an improved application to process and convert signal intensities from mass spectra of \(^{13}C\)-labelled metabolites such as tertbutyldimethylsilyl-derivatives of amino acids. Relative mass intensities and isotopomer distributions are calculated applying a partial least square method with iterative refinement for high precision data. The data output includes formats such as graphs for overall enrichments in amino acids. The package is user-friendly for easy and robust data management of multiple experiments.
Diese Arbeit versucht, die wirtschaftliche Bedeutung der globalen Erwärmung zu erklären und die Lösung dieses Problems zu finden. Die globale Erwärmung als länderübergreifendes Problems kann durch das marktwirtschaftliche Preissystem gelöst werden, besonders durch den internationalen Handel der Schadstoffemission. Hierbei wird die dezentrale Lösungsprinzip betont. Die globale Erwärmung und Politik für die Lösung dieses Problem sind dauerhaft. Daher wird das intertemporale Wachstumsmodell zur Berechnung des Gewinns und der Kosten der Politik verlangt. Dabei wird ein Prinzip besagt, dass jede Generation verantwortlich auf ihre Generation ist. In dieser Arbeit wird versucht, die optimale Handelspolitik und die Kyoto-Politik zu vergleichen.
Langfristige Prognosen sportmotorischer Leistungen sowie die Kenntnis relevanter Einflussfaktoren auf die motorische Entwicklung gewinnen angesichts des veränderten Bewegungsverhaltens und der Zunahme motorischer Defizite von Kindern und Jugendlichen immer stärker an Bedeutung. Der bisherige Forschungsstand zur Stabilität und Vorhersage sportlicher Leistungsfähigkeit beschränkt sich bisher jedoch fast ausschließlich auf retrospektive Studien oder aber auf Längsschnittstudien, die nur einen begrenzten Lebensabschnitt erfassen. Im Vordergrund der vorliegenden multivariaten Längsschnittstudie steht die empirische Analyse potentieller personinterner und personexterner Einflussfaktoren auf die Entwicklung motorischer – insbesondere koordinativer - Fähigkeiten vom Vorschul- bis ins frühe Erwachsenenalter. Außerdem sollte versucht werden, die Ausprägung sportlicher Aktivität und motorischer Fähigkeiten im frühen Erwachsenenalter möglichst gut durch potentielle Prädiktoren aus der Kindheit vorherzusagen. Als theoretischer Rahmen wurde ausgehend von einem fähigkeitsorientierten Ansatz das transaktionale Handlungsmodell von Baur (1989, 1994) ausgewählt, das sowohl endogene als auch exogene Einflussfaktoren auf die motorische Entwicklung berücksichtigt. Die Daten zur motorischen, somatischen und psychischen Entwicklung wurden im Rahmen der Münchner Längsschnittstudie zur Genese individueller Kompetenzen (LOGIK) an 152 Mädchen und Jungen im Alter von 4, 5, 6, 8, 10, 12 und 23 Jahren erhoben. Es zeigen sich bereits im Vorschulalter substantielle Stabilitätskoeffizienten zu den motorischen Leistungen im frühen Erwachsenenalter, die ab dem Grundschulalter auf mittelhohe Werte ansteigen. Als bedeutsame Einflussfaktoren auf die motorische Entwicklung erweisen sich neben der sportlichen Aktivität und dem BMI auch die nonverbale Intelligenz und das athletische Selbstkonzept. In Abhängigkeit von der Schullaufbahn, dem sozioökonomischen Status sowie der Sportvereinszugehörigkeit können Unterschiede im motorischen Entwicklungsverlauf nur zum Teil nachgewiesen werden. Einen nachhaltigen Einfluss auf die motorische Entwicklung bis ins frühe Erwachsenenalter besitzt dagegen das frühe sportive Anregungsniveau im Elternhaus. Mittels schrittweiser Regression können unter Einbezug motorischer, somatischer, kognitiver, persönlichkeitsbezogener und soziodemographischer Merkmale im Vorschulalter bereits bis zu 31%, ab dem Grundschulalter bis zu 46% der Varianz motorischer Leistungen mit 23 J. aufgeklärt werden. Für eine befriedigende Prognose späterer motorischer Leistungen sollten deshalb neben den motorischen Leistungskomponenten auch somatische, kognitive, persönlichkeitsbezogene und sozialisationsbedingte Einflüsse berücksichtigt werden. Die relativ hohe Stabilität motorischer Fähigkeiten ab dem Grundschulalter deutet darauf hin, dass bereits in der Kindheit die Grundlagen für die weitere motorische Entwicklung gelegt werden. Ein effizienter Ansatzpunkt zur Intervention scheint hier vor allem die Förderung von sportlicher Aktivität und Sportinteresse im Elternhaus zu sein.
The Role of Attentional Control and Fear Acquisition and Generalization in Social Anxiety Disorder
(2020)
Although Social Anxiety Disorder (SAD) is one of the most prevalent mental disorders, still little is known about its development and maintenance. Cognitive models assume that deviations in attentional as well as associative learning processes play a role in the etiology of SAD. Amongst others, deficits in inhibitory attentional control as well as aberrations during fear generalization, which have already been observed in other anxiety disorders, are two candidate mechanisms that might contribute to the onset and retention of SAD. However, a review of the literature shows that there is a lack of research relating to these topics. Thus, the aim of the present thesis was to examine in which way individuals with SAD differ from healthy controls regarding attentional control and generalization of acquired fear during the processing of social stimuli.
Study 1 tested whether impairment in the inhibitory control of attention is a feature of SAD, and how it might be influenced by emotional expression and gaze direction of an interactional partner. For this purpose, individuals with SAD and healthy controls (HC) participated in an antisaccade task with faces displaying different emotional expressions (angry, neutral and happy) and gaze directions (direct and averted) serving as target stimuli. While the participants performed either pro- or antisaccades in response to the peripherally presented faces, their gaze behavior was recorded via eye-tracking, and ratings of valence and arousal were obtained. Results revealed that both groups showed prolonged latencies and increased error rates in trials with correct anti- compared to prosaccades. However, there were no differences between groups with regard to response latency or error rates, indicating that SAD patients did not exhibit impairment on inhibitory attentional control in comparison to HC during eye-tracking. Possible explanations for this finding could be that reduced inhibitory attentional control in SAD only occurs under certain circumstances, for example, when these individuals currently run the risk of being negatively evaluated by others and not in the mere presence of phobic stimuli, or when the cognitive load of a task is so high that it cannot be unwound by compensatory strategies, such as putting more effort into a task.
As not only deviations in attentional, but also associative learning processes might be pathogenic markers of SAD, these mechanisms were further addressed in the following experiments. Study 2 is the first that attempted to investigate the generalization of conditioned fear in patients with SAD. To this end, patients with SAD and HC were conditioned to two neutral female faces serving as conditioned stimuli (CS+: reinforced; CS-: non-reinforced) and a fearful face paired with a loud scream serving as unconditioned stimulus (US). Fear generalization was tested by presenting morphs of the two faces (GS: generalization stimuli), which varied in their similarity to the original faces. During the whole experiment, self-report ratings, heart rate (HR) and skin conductance responses (SCR) were recorded. Results demonstrated that SAD patients rated all stimuli as less pleasant and more arousing, and overestimated the occurrence of the US compared to HC, indicating a general hyperarousal in individuals with SAD. In addition, ratings and SCR indicated that both groups generalized their acquired fear from the CS+ to intermediate GSs as a function of their similarity to the CS+. However, except for the HR data, which indicated that only SAD patients but not HC displayed a generalization response in this measure, most of the results did not support the hypothesis that SAD is characterized by overgeneralization. A plausible reason for this finding could be that overgeneralization is just a key characteristic of some anxiety disorders and SAD is not one of them. Still, other factors, such as comorbidities in the individuals with SAD, could also have had an influence on the results, which is why overgeneralization was further examined in study 3.
The aim of study 3 was to investigate fear generalization on a neuronal level. Hence, high (HSA) and low socially anxious participants (LSA) underwent a conditioning paradigm, which was an adaption of the experimental design used study 2 for EEG. During the experiment, steady-state visually evoked potentials (ssVEPs) and ratings of valence and arousal were recorded. Analyses revealed significant generalization gradients in all ratings with highest fear responses to the CS+ and a progressive decline of these reactions with increasing similarity to the CS-. In contrast, the generalization gradient on a neuronal level showed highest amplitudes for the CS+ and a reduction in amplitude to the most proximal, but not distal GSs in the ssVEP signal, which might be interpreted as lateral inhibition in the visual cortex. The observed dissociation among explicit and implicit measures points to different functions of behavioral and sensory cortical processes during fear generalization: While the ratings might reflect an individual’s consciously increased readiness to react to threat, the lateral inhibition pattern in the occipital cortex might serve to maximize the contrast among stimuli with and without affective value and thereby improve adaptive behavior. As no group differences could be observed, the finding of study 2 that overgeneralization does not seem to be a marker of SAD is further consolidated.
In sum, the conducted experiments suggest that individuals with SAD are characterized by a general hyperarousal during the exposition to disorder-relevant stimuli as indicated by enhanced arousal and reduced valence ratings of the stimuli compared to HC. However, the hypotheses that reduced inhibitory attentional control and overgeneralization of conditioned fear are markers of SAD were mostly not confirmed. Further research is required to elucidate whether they only occur under certain circumstances, such as high cognitive load (e.g. handling two tasks simultaneously) or social stress (e.g. before giving a speech), or whether they are not characteristics of SAD at all. With the help of these findings, new interventions for the treatment of SAD can be developed, such as attentional bias modification or discrimination learning.
Past and the projected future climate change in Afghanistan has been analyzed systematically and differentiated with respect to its different climate regions to gain some first quantitative insights into Afghanistan’s vulnerability to ongoing and future climate changes. For this purpose, temperature, precipitation and five additional climate indices for extremes and agriculture assessments (heavy precipitation; spring precipitation; growing season length (GSL), the Heat Wave Magnitude Index (HWMI); and the Standardized Precipitation Evapotranspiration Index (SPEI)) from the reanalysis data were examined for their consistency to identify changes in the past (data since 1950). For future changes (up to the year 2100), the same parameters were extracted from an ensemble of 12 downscaled regional climate models (RCM) of the Coordinated Regional Climate Downscaling Experiment (CORDEX)-South Asia simulations for low and high emission scenarios (Representative Concentration Pathways 4.5 and 8.5). In the past, the climatic changes were mainly characterized by a mean temperature increase above global level of 1.8 °C from 1950 to 2010; uncertainty with regard to reanalyzed rainfall data limited a thorough analysis of past changes. Climate models projected the temperature trend to accelerate in the future, depending strongly on the global carbon emissions (2006–2050 Representative Concentration Pathways 4.5/8.5: 1.7/2.3 °C; 2006–2099: 2.7/6.4 °C, respectively). Despite the high uncertainty with regard to precipitation projections, it became apparent that the increasing evapotranspiration is likely to exacerbate Afghanistan’s already existing water stress, including a very strong increase of frequency and magnitude of heat waves. Overall, the results show that in addition to the already extensive deficiency in adaptation to current climate conditions, the situation will be aggravated in the future, particularly in regard to water management and agriculture. Thus, the results of this study underline the importance of adequate adaptation to climate change in Afghanistan. This is even truer taking into account that GSL is projected to increase substantially by around 20 days on average until 2050, which might open the opportunity for extended agricultural husbandry or even additional harvests when water resources are properly managed.
Abstrakt
Hypertrophe Kardiomyopathie (HCM) ist eine genetisch bedingte Herzmuskelerkrankung mit einer Prävalenz von 0,2 bis 0,6% und einem SCD-Risiko von 0,5 bis 1% pro Jahr. HCM ist die häufigste Ursache für plötzlichen Herztod in jungem Alter. Seit Jahrzehnten wird bei HCM der optimale Vorhersagescore für SCD untersucht. Der erste validierte SCD-Sore bei HCM wurde im Jahr 2014 in die ESC-Leitlinien integriert.
Ziel der Studie:
Vergleich des berechneten SCD-Scores bei HCM aus dem Jahr 2014 vor und nach Alkohol- Septum-Ablation (PTSMA) mit dem erreichten Endpunkt (SCD).
Methoden:
56 Patienten mit hypertropher obstruktiver Kardiomyopathie (HOCM) und Erst-PTSMA im Jahr 2009 wurden eingeschlossen: Alter 53,9 ± 11,5 Jahre, 7% positive Familienanamnese für SCD, 9% ungeklärte Synkope im letzten Jahr, 43% NSVT, maximale LV-Wanddicke 20,2 ± 4,3 mm, maximaler LVOT-Gradient 118 ± 42 mmHg, LA-Durchmesser 45,3 ± 6,4 mm.
Ergebnisse:
Vor dem ersten PTSMA hatten die HOCM-Patienten einen errechneten SCD-Wert von 4,2 ± 3,2%, nach PTSMA von 3,2 ± 2,2%. Wir beobachteten 2 (3,6%) SCD-Fälle in 5 Jahren.
Die PTSMA führte zu einer signifikanten Reduktion des errechneten SCD-Scores von 1,0 ± 2,8%, p <0,05. Diese Reduktion war hauptsächlich durch die signifikante Reduktion des LVOT-Gradienten (durchschnittlich 54 ± 42 mmHg, p <0,05) zurückzuführen.
Fazit:
PTSMA ist eine etablierte Behandlung zur Verbesserung der Symptome bei HOCM-Patienten ohne Hinweis auf eine höhere Mortalität nach induziertem Infarkt. Der ESC-SCD-Score ist nur ein Hilfsalgorithmus für die individuelle Entscheidung bezüglich einer primärprophylaktischen AICD-Implantation.
Veränderungen im intestinalen Mikrobiom bei Patienten mit akuter Leukämie im longitudinalen Verlauf
(2020)
In der vorliegenden Studie wurden Veränderungen des Darmmikrobioms anhand von Stuhlproben von Patienten mit akuter Leukämie longitudinal untersucht. Die Patienten wurden mit intensiver Chemotherapie behandelt. Die Therapie als auch die Erkrankung selbst führte zu einer erheblichen Immunsuppression der Patienten. Prophylaktisch und therapeutisch wurden intensive Antibiotikatherapien bei allen Patienten durchgeführt.
Das Mikrobiom wurde quantitativ und qualitativ analysiert. Die Bakterienmenge der Stuhlproben wurde mittels quantitativer Polymerase-Kettenreaktion und die Diversität des Mikrobioms mittels 16s rDNA Sequenzierung aufgezeigt. Zusätzlich dazu fand eine mikrobiologische Kultivierung von Bakterien in Rektalabstrichen statt, um multiresistente Keime nachzuweisen. Ebenso wurde der klinische Verlauf der Patienten dokumentiert.
Insgesamt wurde das Mikrobiom von drei verschiedenen Studiengruppen untersucht: Patienten mit akuter Leukämie, Patienten, die mit multiresistenten Keimen besiedelt waren und sich in der Nachsorge der Würzburger interdisziplinären onkologischen Tagesklinik befanden sowie gesunde Probanden.
Im Mikrobiom der Patienten mit akuter Leukämie war eine deutlich geringere Diversität sowie eine deutlich geringere Bakterienmenge im Vergleich zu beiden anderen Studiengruppen festzustellen. Das Mikrobiom änderte sich während des Therapieverlaufs erheblich und am Beispiel von einigen Patienten konnte gezeigt werden, dass einzelne Bakterien das Mikrobiom dominierten. Des Weiteren waren im Mikrobiom der Patienten mit akuter Leukämie mehr potenziell pathogene sowie weniger potenziell protektive Bakterien im Vergleich zur Kontrollgruppe vorhanden.
Zusammenfassend lässt sich sagen, dass sich das Mikrobiom der Patienten mit akuter Leukämie deutlich von dem der anderen Studiengruppen unterscheidet. Um die Daten zu validieren und einen eventuellen Einfluss des Mikrobioms auf das Überleben der Patienten zu identifizieren, sollten die Untersuchungen an einer deutlich größeren Studienpopulation wiederholt werden.
Gold nanoparticles of diameter ca. 60 nm have been synthesized based on Turkevich and Frens protocols. We have demonstrated that the carboxyl-modified gold nanoparticles can be coupled covalently with antibodies (Ab) of interest using the EDC/NHS coupling procedure. Binding studies with Ab-grafted AuNPs and GpL fusion proteins proved that conjugation of AuNPs with antibodies enables immobilization of antibodies with preservation of a significant antigen binding capacity. More importantly, our findings showed that the conjugation of types of anti-TNF receptors antibodies such as anti-Fn14 antibodies (PDL192 and 5B6) (Aido et al., 2021), anti-CD40, anti-4-1BB and anti-TNFR2 with gold nanoparticles confers them with potent agonism. Thus, our results suggest that AuNPs can be utilized as a platform to immobilize anti-TNFR antibodies which, on the one hand, helps to enhance their agonistic activity in comparison to “free” inactive antibodies by mimicking the effect of cell-anchored antibodies or membrane-bound TNF ligands and, on the other hand, allows to develop new generations of drug delivery systems. These constructs are characterized with their biocompatibility and their tunable synthesis process.
In a further work part, we combined the benefits of the established system of Ab-AuNPs with materials used widely in the modern biofabrication approaches such as the photo-crosslinked hydrogels, methacrylate-modified gelatin (GelMA), combined with embedded variants of human cell lines. The acquired results demonstrated clearly that the attaching of proteins like antibodies to gold nanoparticles might reduce their release rate from the crosslinked hydrogels upon the very low diffusion of gold nanoparticles from the solid constructs to the surrounding medium yielding long-term local functioning proteins-attached particles. Moreover, our finding suggests that hydrogel-embedded AuNP-immobilized antibodies, e.g. anti-TNFα-AuNPs or anti-IL1-AuNPs enable local inhibitory functions,
To sum up, our results demonstrate that AuNPs can act as a platform to attach anti-TNFR antibodies to enhance their agonistic activity by resembling the output of cell-anchoring or membrane bounding. Gold nanoparticles are considered, thus, as promising tool to develop the next generation of drug delivery systems, which may contribute to cancer therapy. On top of that, the embedding of anti-inflammatory-AuNPs in the biofabricated hydrogel presents new innovative strategy of the treatment of autoinflammatory diseases.
Conventional bivalent IgG antibodies targeting a subgroup of receptors of the TNF superfamily (TNFSF) including fibroblast growth factor-inducible 14 (anti-Fn14) typically display no or only very limited agonistic activity on their own and can only trigger receptor signaling by crosslinking or when bound to Fcγ receptors (FcγR). Both result in proximity of multiple antibody-bound TNFRSF receptor (TNFR) molecules, which enables engagement of TNFR-associated signaling pathways. Here, we have linked anti-Fn14 antibodies to gold nanoparticles to mimic the “activating” effect of plasma membrane-presented FcγR-anchored anti-Fn14 antibodies. We functionalized gold nanoparticles with poly-ethylene glycol (PEG) linkers and then coupled antibodies to the PEG surface of the nanoparticles. We found that Fn14 binding of the anti-Fn14 antibodies PDL192 and 5B6 is preserved upon attachment to the nanoparticles. More importantly, the gold nanoparticle-presented anti-Fn14 antibody molecules displayed strong agonistic activity. Our results suggest that conjugation of monoclonal anti-TNFR antibodies to gold nanoparticles can be exploited to uncover their latent agonism, e.g., for immunotherapeutic applications.
Platelets play an important role in the body, since they are part of the hemostasis
system, preventing and stopping blood loss. Nevertheless, when platelet or
coagulation system function are impaired, uncontrolled bleedings but also irreversible
vessel occlusion followed by ischemic tissue damage can occur. Therefore,
understanding platelet function and activation, mechanisms which are controlled by a
variety of platelet membrane receptors and other factors is important to advance out
knowledge of hemostasis and platelet malfunction. For a complete picture of platelet
function and their modulating behavior it is desired to be able to quantify receptor
distributions and interactions of these densely packed molecular ensembles in the
membrane. This challenges scientists for several reasons. Most importantly, platelets
are microscopically small objects, challenging the spatial resolution of conventional
light microscopy. Moreover, platelet receptors are highly abundant on the membrane
so even super-resolution microscopy struggles with quantitative receptor imaging on
platelets.
With Expansion microscopy (ExM), a new super-resolution technique was introduced,
allowing resolutions to achieve super-resolution without using a super-resolution
microscope, but by combining a conventional confocal microscopy with a highly
processed sample that has been expanded physically. In this doctoral thesis, I
evaluated the potential of this technique for super-resolution platelet imaging by
optimizing the sample preparation process and establishing an imaging and image
processing pipeline for dual-color 3D images of different membrane receptors. The
analysis of receptor colocalization using ExM demonstrated a clear superiority
compared to conventional microscopy. Furthermore, I identified a library of
fluorescently labeled antibodies against different platelet receptors compatible with
ExM and showed the possibility of staining membrane receptors and parts of the
cytoskeleton at the same time.
Myeloid-derived suppressor cells (MDSC) represent major regulators of immune responses, which can control T cells via their inducible nitric oxide synthase (iNOS)- and arginase 1 (Arg1)-mediated effector functions. While GM-CSF is well documented to promote MDSC development, little is known about this potential of IL-3, an established growth factor for mast cells. Here, we show that IL-3, similar to GM-CSF, generates monocytic MDSC (M-MDSC) from murine bone marrow (BM) cells after 3 days of in vitro culture. At this time point, predominantly CD11b+ CD49a+ monocytic and CD11b+ CD49a- FcεR I- neutrophilic cells were detectable, while CD11blow/neg FcεR I+ mast cells accumulated only after extended culture periods. Both growth factors were equivalent in generating M-MDSC with respect to phenotype, cell yield and typical surface markers. However, IL-3 generated M-MDSC produced less TNF, IL-1β and IL-10 after activation with LPS + IFN-γ but showed higher Arg1 expression compared to GM-CSF generated M-MDSC. Arg1 was further induced together with iNOS after MDSC activation. Accordingly, an increased Arg1-dependent suppressor activity by the IL-3 generated M-MDSC was observed using respective iNOS and Arg1 inhibitors. Together, these data indicate that M-MDSC can be generated in vitro by IL-3, similar to GM-CSF, but with increased Arg1 expression and Arg1-mediated suppression capacity. This protocol now allows further in vitro studies on the role of IL-3 for MDSC biology.
The Chlamydiae constitute an evolutionary well separated group of intracellular bacteria comprising important pathogens of humans as well as symbionts of protozoa. The amoeba symbiont Protochlamydia amoebophila lacks a homologue of the most abundant outer membrane protein of the Chlamydiaceae, the major outer membrane protein MOMP, highlighting a major difference between environmental chlamydiae and their pathogenic counterparts. We recently identified a novel family of putative porins encoded in the genome of P. amoebophila by in silico analysis. Two of these Protochlamydia outer membrane proteins, PomS (pc1489) and PomT (pc1077), are highly abundant in outer membrane preparations of this organism. Here we show that all four members of this putative porin family are toxic when expressed in the heterologous host Escherichia coli. Immunofluorescence analysis using antibodies against heterologously expressed PomT and PomS purified directly from elementary bodies, respectively, demonstrated the location of both proteins in the outer membrane of P. amoebophila. The location of the most abundant protein PomS was further confirmed by immuno-transmission electron microscopy. We could show that pomS is transcribed, and the corresponding protein is present in the outer membrane throughout the complete developmental cycle, suggesting an essential role for P. amoebophila. Lipid bilayer measurements demonstrated that PomS functions as a porin with anion-selectivity and a pore size similar to the Chlamydiaceae MOMP. Taken together, our results suggest that PomS, possibly in concert with PomT and other members of this porin family, is the functional equivalent of MOMP in P. amoebophila. This work contributes to our understanding of the adaptations of symbiotic and pathogenic chlamydiae to their different eukaryotic hosts.
Research on the deployment and use of technology to assist learning has seen a significant
rise over the last decades (Aparicio et al., 2017). The focus on course quality, technology,
learning outcome and learner satisfaction in e-learning has led to insufficient attention by
researchers to individual characteristics of learners (Cidral et al., 2017 ; Hsu et al., 2013). The current work aims to bridge this gap by investigating characteristics identified by previous works and backed by theory as influential individual differences in e-learning. These learner characteristics have been suggested as motivational factors (Edmunds et al., 2012) in decisions by learners to interact and exchange information (Luo et al., 2017).
In this work e-learning is defined as interaction dependent information seeking and sharing enabled by technology. This is primarily approached from a media psychology perspective. The role of learner characteristics namely, beliefs about the source of knowledge (Schommer, 1990), learning styles (Felder & Silverman, 1988), need for affect (Maio & Esses, 2001), need for cognition (Cacioppo & Petty, 1982) and power distance (Hofstede, 1980) on interactions to seek and share information in e-learning are investigated. These investigations were shaped by theory and empirical lessons as briefly mentioned in the next paragraphs. Theoretical support for investigations is derived from the technology acceptance model(TAM) by psychologist Davis (1989) and the hyper-personal model by communication scientist Walther (1996). The TAM was used to describe the influence of learner characteristics on decisions to use e-learning systems (Stantchev et al., 2014). The hyper-personal model described why computer-mediated communication thrives in e-learning (Kaye et al., 2016) and how learners interpret messages exchanged online (Hansen et al., 2015). This theoretical framework was followed by empirical reviews which justified the use of interaction and information seeking-sharing as key components of e-learning as well as the selection of learner characteristics. The reviews provided suggestions for the measurement of variables (Kühl et al., 2014) and the investigation design (Dascalau et al., 2015). Investigations were designed and implemented through surveys and quasi experiments which were used for three preliminary studies and two main studies. Samples were selected from Germany and Ghana with same variables tested in both countries. Hypotheses were tested with interaction and information seeking-sharing as dependent variables while beliefs about the source of knowledge, learning styles, need for affect, need for cognition and power distance were independent variables. Firstly, using analyses of variance, the influence of beliefs about the source of knowledge on interaction choices of learners was supported. Secondly, the role of need for cognition on interaction choices of learners was supported by results from a logistic regression. Thirdly, results from multiple linear regressions backed the influence of need for cognition and power distance on information seeking-sharing behaviour of learners. Fourthly, the relationship between need for affect and need for cognition
was supported. The findings may have implications for media psychology research, theories used in this work, research on e-learning, measurement of learner characteristics and the design of e-learning platforms. The findings suggest that, the beliefs learners have about the source of knowledge, their need for cognition and their power distance can influence decisions to interact and seek or share information. The outlook from reviews and findings in this work predicts more research on learner characteristics and a corresponding intensity in the use of e-learning by individuals. It is suggested that future studies investigate the relationship between learner autonomy and power distance. Studies on inter-cultural similarities amongst e-learners in different populations are also
suggested.
Protein-protein interaction (PPI) studies are gaining momentum these days due to the plethora of various high-throughput experimental methods available for detecting PPIs. Proteins create complexes and networks by functioning in harmony with other proteins and here in silico network biology hold the promise to reveal new functionality of genes as it is very difficult and laborious to carry out experimental high-throughput genetic screens in living organisms. We demonstrate this approach by computationally screening C. elegans conserved homologs of already reported human tumor suppressor and aging associated genes. We select by this nhr-6, vab-3 and gst-23 as predicted longevity genes for RNAi screen. The RNAi results demonstrated the pro-longevity effect of these genes. Nuclear hormone receptor nhr-6 RNAi inhibition resulted in a C. elegans phenotype of 23.46% lifespan reduction. Moreover, we show that nhr-6 regulates oxidative stress resistance in worms and does not affect the feeding behavior of worms. These findings imply the potential of nhr-6 as a common therapeutic target for aging and cancer ailments, stressing the power of in silico PPI network analysis coupled with RNAi screens to describe gene function.
The rapid appearance of resistant malarial parasites after introduction of atovaquone (ATQ) drug has prompted the search for new drugs as even single point mutations in the active site of Cytochrome b protein can rapidly render ATQ ineffective. The presence of Y268 mutations in the Cytochrome b (Cyt b) protein is previously suggested to be responsible for the ATQ resistance in Plasmodium falciparum (P. falciparum). In this study, we examined the resistance mechanism against ATQ in P. falciparum through computational methods. Here, we reported a reliable protein model of Cyt bc1 complex containing Cyt b and the Iron-Sulphur Protein (ISP) of P. falciparum using composite modeling method by combining threading, ab initio modeling and atomic-level structure refinement approaches. The molecular dynamics simulations suggest that Y268S mutation causes ATQ resistance by reducing hydrophobic interactions between Cyt bc1 protein complex and ATQ. Moreover, the important histidine contact of ATQ with the ISP chain is also lost due to Y268S mutation. We noticed the induced mutation alters the arrangement of active site residues in a fashion that enforces ATQ to find its new stable binding site far away from the wild-type binding pocket. The MM-PBSA calculations also shows that the binding affinity of ATQ with Cyt bc1 complex is enough to hold it at this new site that ultimately leads to the ATQ resistance.
In the recent years, translational studies comparing imaging data of animals and humans have gained increasing scientific interests with crucial findings stemming from both, human and animal work. In order to harmonize statistical analyses of data from different species and to optimize the transfer of knowledge between them, shared data acquisition protocols and combined statistical approaches have to be identified. Following this idea, methods of data analysis, which have until now mainly been used to model neural responses of electrophysiological recordings from rodent data, were applied on human hemodynamic responses (i.e. Blood-Oxygen-Level-Dependent BOLD signal) as measured via functional magnetic resonance imaging (fMRI).
At the example of two attention and impulsivity networks, timing dynamics and amplitude of the fMRI signal were determined (study 1). Study 2 described the same parameters frequency-specifically, and in study 3, the complexity of neural processing was quantified in terms of fractality. Determined parameters were compared with regard to the subjects’ task performance / impulsivity to validate findings with regard to reports of the current scientific debate.
In a general discussion, overlapping as well as additional information of methodological approaches were discussed with regard to its potential for biomarkers in the context of neuropsychiatric disorders.
In the recent years, translational studies comparing imaging data of animals and humans have gained increasing
scientific interests with crucial findings stemming from both, human and animal work. In order to harmonize
statistical analyses of data from different species and to optimize the transfer of knowledge between them, shared
data acquisition protocols and combined statistical approaches have to be identified. Following this idea, methods
of data analysis, which have until now mainly been used to model neural responses of electrophysiological
recordings from rodent data, were applied on human hemodynamic responses (i.e. Blood-Oxygen-Level-
Dependent BOLD signal) as measured via functional magnetic resonance imaging (fMRI).
At the example of two attention and impulsivity networks, timing dynamics and amplitude of the fMRI signal were
determined (study 1). Study 2 described the same parameters frequency-specifically, and in study 3, the
complexity of neural processing was quantified in terms of fractality. Determined parameters were compared with
regard to the subjects’ task performance / impulsivity to validate findings with regard to reports of the current
scientific debate.
In a general discussion, overlapping as well as additional information of methodological approaches were
discussed with regard to its potential for biomarkers in the context of neuropsychiatric disorders.
Fractal phenomena can be found in numerous scientific areas including neuroscience. Fractals are structures, in which the whole has the same shape as its parts. A specific structure known as pink noise (also called fractal or 1/f noise) is one key fractal manifestation, exhibits both stability and adaptability, and can be addressed via the Hurst exponent (H). FMRI studies using H on regional fMRI time courses used fractality as an important characteristic to unravel neural networks from artificial noise. In this fMRI-study, we examined 103 healthy male students at rest and while performing the 5-choice serial reaction time task. We addressed fractality in a network associated with waiting impulsivity using the adaptive fractal analysis (AFA) approach to determine H. We revealed the fractal nature of the impulsivity network. Furthermore, fractality was influenced by individual impulsivity in terms of decreasing fractality with higher impulsivity in regions of top-down control (left middle frontal gyrus) as well as reward processing (nucleus accumbens and anterior cingulate cortex). We conclude that fractality as determined via H is a promising marker to quantify deviations in network functions at an early stage and, thus, to be able to inform preventive interventions before the manifestation of a disorder.
The Kunduz River is one of the main tributaries of the Amu Darya Basin in North Afghanistan. Many communities live in the Kunduz River Basin (KRB), and its water resources have been the basis of their livelihoods for many generations. This study investigates climate change impacts on the KRB catchment. Rare station data are, for the first time, used to analyze systematic trends in temperature, precipitation, and river discharge over the past few decades, while using Mann–Kendall and Theil–Sen trend statistics. The trends show that the hydrology of the basin changed significantly over the last decades. A comparison of landcover data of the river basin from 1992 and 2019 shows significant changes that have additional impact on the basin hydrology, which are used to interpret the trend analysis. There is considerable uncertainty due to the data scarcity and gaps in the data, but all results indicate a strong tendency towards drier conditions. An extreme warming trend, partly above 2 °C since the 1960s in combination with a dramatic precipitation decrease by more than −30% lead to a strong decrease in river discharge. The increasing glacier melt compensates the decreases and leads to an increase in runoff only in the highland parts of the upper catchment. The reduction of water availability and the additional stress on the land leads to a strong increase of barren land and a reduction of vegetation cover. The detected trends and changes in the basin hydrology demand an active management of the already scarce water resources in order to sustain water supply for agriculture and ecosystems in the KRB.
We examined the regulation of NFATc1 in different lymphomas and observed an inversed correlation between the methylation status and expression of NFATc1. Our data demonstrate that aberrant DNA methylation associated with chromatin remodeling within nfatc1 locus is a major mechanism for the repression of NFATc1 expression, suggesting that the DNA methylation-mediated transcriptional silencing of NFATc1 may be a critical event in the tumorogenesis of ALCLs and cHLs. Furthermore, the DNA methylation of human nfatc1 promoter region could be used as a novel biomarker of tumor progression. Our results indicate a close link between the loss of immunoreceptor signaling and NFATc1 expression in human lymphomas. For both ALCLs and cHLs, defects in immunoreceptor signaling have been described which result in a loss of receptor-mediated gene expression programs (Schwering et al., 2003; Bonzheim et al., 2004; Marafioti et al., 2004). In T cells, one indicator gene of these programs appears to be the nfatc1 gene whose expression is controlled by TCR signals (Chuvpilo et al., 2002a). In contrast, in T cells NFATc1 expression is unaffected by TCR signals, and NFATc2 was found to be expressed at normal levels in ALCLs and cHLs (L.K., unpubl. data). Moreover, the activity of NF-kappaB factors which can bind to certain NFAT binding sites and share a distantly-related DNA binding domain with NFATs is strongly elevated in cHL cells (Bargou et al., 1997; Hinz et al., 2001; Hinz et al., 2002) suggesting that NFATs and NF-kappaBs exert very different effects on generation and maintenance of Hodgkin’s lymhomas. However, it should be mentioned that in Burkitt’s and further B cell lymphomas in which NFATc1 proteins are strongly expressed and controlled by receptor signals (Kondo et al., 2003), they could exert a promoting function in tumor development. The genes of p53 family members p63 and p73 are prominent examples for mammalian genes whose products can act both as oncoproteins and tumor suppressor genes (Hibi et al., 2000; Stiewe and Putzer, 2002), and it is likely that more genes exist which encode both tumor suppressors and oncoproteins. It remains to be shown whether the nfatc1 gene is one of them.
This thesis is devoted to numerical verification of optimality conditions for non-convex optimal control problems. In the first part, we are concerned with a-posteriori verification of sufficient optimality conditions. It is a common knowledge that verification of such conditions for general non-convex PDE-constrained optimization problems is very challenging. We propose a method to verify second-order sufficient conditions for a general class of optimal control problem. If the proposed verification method confirms the fulfillment of the sufficient condition then a-posteriori error estimates can be computed. A special ingredient of our method is an error analysis for the Hessian of the underlying optimization problem. We derive conditions under which positive definiteness of the Hessian of the discrete problem implies positive definiteness of the Hessian of the continuous problem. The results are complemented with numerical experiments. In the second part, we investigate adaptive methods for optimal control problems with finitely many control parameters. We analyze a-posteriori error estimates based on verification of second-order sufficient optimality conditions using the method developed in the first part. Reliability and efficiency of the error estimator are shown. We illustrate through numerical experiments, the use of the estimator in guiding adaptive mesh refinement.
Studies of the fragmentation of jets into charged particles in heavy-ion collisions can help in understanding the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. These proceedings present a measurement of the angular distribution of charged particles around the jet axis in root s(NN) = 5.02 TeV Pb+Pb and pp collisions, done using the ATLAS detector at the LHC. The measurement is performed inside jets reconstructed with the anti-k(t) algorithm with radius parameter R = 0.4, and is extended to regions outside the jet cone. Results are presented as a function of Pb+Pb collision centrality, and both jet and charged-particle transverse momenta.
Die Bedeutung der cAMP- und cGMP-abhängigen Proteinkinase für die Hemmung der Plättchenaktivierung und -aggregation ist gut beschrieben. Zahlreiche fundamentale Plättchenantworten wie die Erhöhung der intrazellulären Calciumkonzentration, die Exposition von Adhäsionsrezeptoren und die Aktinpolymerisation können durch die Cyclonukleotid vermittelte Kinasenaktivierung fast vollständig gehemmt werden. Die Vielfalt der cGMP bindenden Proteine und deren synergistische Interaktion mit cAMP vermittelten Signalwegen deuten auf eine Reihe von cGMP Zielproteinen hin. Vor kurzem wurde die zentrale Bedeutung einer Gi-Protein Stimulation für die Plättchenaktivierung und –aggregation gezeigt. In dieser Dissertation wurde daher der Frage nachgegangen, ob Signalmoleküle, die an Gi-Protein vermittelten Effekten beteiligt sind, einen Angriffspunkt für cAMP/cGMP-abhängige Proteinkinasen darstellen. Zu diesem Zweck wurden die Effekte erhöhter cGMP Spiegel und die selektive Aktivierung der cGMP-abhängigen Proteinkinase auf die adrenerge und purinerge Rezeptor vermittelte Erniedrigung stimulierter cAMP Konzentrationen untersucht. In unseren Versuchen konnte erstmalig gezeigt werden, dass eine Erhöhung der intrazellulären cGMP Konzentration Gi-Protein vermittelte Signale hemmt. Dieses erfolgt nicht auf Grund einer cGMP stimulierten Aktivierung von cyclonukleotidabbauenden Phosphodiesterasen, sondern auf Grund einer Aktivierung der cGMP-abhängigen Proteinkinase. In Anbetracht der essentiellen Bedeutung der Gi-Protein Stimulation für die Plättchenaktivierung stellt dies einen wichtigen Mechanismus dar, wie das aus dem Endothel freigesetzte NO über cGMP die Thrombozytenfunktion hemmt. Klinisch bedeutsame Substanzen wie Clopidogrel oder Ticlopidin imitieren diesen in vivo Effekt des NO, indem sie extrazellulär über eine Rezeptorhemmung Gi-Protein Stimulation verhindern. (Aktas et al., Biochem Pharmacol 2002; 64: 433-439) Dipyridamol und im Besonderen die Kombination von Dipyridamol und niedrig dosierter Acetylsalicylsäure sind in der Sekundärprävention des Schlaganfalles sehr gut wirksam. Jedoch sind die hierfür zu Grunde liegenden biochemischen Mechanismen noch nicht vollständig aufgeklärt. Da für das Dipyridamol eine in vitro Hemmung der cGMP-spezifischen Phosphodiesterase 5 (PDE 5) nachgewiesen ist, wurde in dieser Arbeit untersucht, ob Dipyridamol in therapeutisch relevanten Konzentrationen die NO/cGMP vermittelte Effekte auf die Plättchenfunktion unter ex vivo Bedingungen verstärkt. Die Phosphorylierung von VASP (VAsodilator-Stimulated Phosphoprotein) diente dabei als Meßparameter NO/cGMP Signale in Thrombozyten mit Hilfe von Antikörpern und Western Blot Technik zu quantifizieren. Die Sekretion von Serotonin aus Thrombozyten und die Aktivität der Thromboxansynthase wurden durch die fluorimetrische Bestimmung derivatisierten Serotonins bzw. des Synthaseprodukts Malondialdehyd quantifiziert. Endotheliale Faktoren wie NO oder PG-I2 erhöhen cGMP bzw. cAMP, die zu einer Plättchenhemmung und gleichzeitigen VASP Phosphorylierung führen. In in vitro Versuchen potenzierte Dipyridamol in einer therapeutisch relevanten Konzentration (3,5 µmol/l) nur die cGMP vermittelte, aber nicht die cAMP vermittelte VASP Phosphorylierung. Darüber hinaus konnte Dipyridamol (3,5 µmol/l) die Hemmung von Plättchenfunktionen wie der Serotoninsekretion und die Aktivität der Thromboxansynthase durch einen NO Donor klar verstärken. Schließlich steigerte Dipyridamol die NO vermittelte VASP Phosphorylierung auch in Thrombozyten von Probanden, die vorher Dipyridamol eingenommen hatten. Unter therapeutisch relevanten Bedingungen verstärkt also Dipyridamol NO/cGMP Signalwege und damit die Hemmung von Thrombozyten. Dieser Befund bekräftigt die Vorstellung, dass die Verstärkung endothelialer NO/cGMP Effekte auf Thrombozyten eine wichtige Komponente der Dipyridamol Wirkung unter in vivo Bedingungen darstellt. (Aktas et al., Stroke 2003; 34(3): 764-769) Die Stimulation von Thrombozyten führt u.a. zu einer Sekretion von Plättchenaktivatoren wie Thrombin, Thromboxan A2, ADP oder Serotonin aus dem Zellinnern. Durch diesen Prozess der Degranulierung können nun weitere Thrombozyten aktiviert werden. Die Sekretion stellt somit einen wichtigen, verstärkenden Schritt in der Aktivierung von Thrombozyten während der Hämostase dar. Diese Arbeit zeigt, dass in Thrombozyten eine Gi-Protein Aktivierung nicht nur wie bisher angenommen eine initiale Sekretion durch Gq verstärkt und aufrecht erhält, sondern der eigentliche Stimulus ist, der die Degranulierung von Thrombozyten auslöst. Die Stimulation Gq vermittelter Signalwege ist nur insofern erforderlich, als diese das Auslösen der Sekretion durch eine Aktivierung von Gi-Proteinen ermöglichen. Die Stimulierung beider G-Proteine ist daher essentiell für die thrombozytäre Sekretion. Zudem konnte die Phospholipase D als ein neuer Effektor des P2Y12 nachgewiesen werden, deren Stimulierung wahrscheinlich zur Degranulierung von Thrombozyten führt. Dieser Mechanismus könnte der Entscheidende sein, der der essentiellen Rolle des Gi-Proteins bei der Stimulation der Sekretion und der Aktivierung von Thrombozyten zu Grunde liegt und könnte ein neues Licht auf die Wirkweise des Clopidogrels und des Ticlopidins werfen, die irreversibel an den P2Y12 Rezeptor binden. (Aktas et al., Manuskript in Vorbereitung)
The Best for the Most Important: Maintaining a Pristine Proteome in Stem and Progenitor Cells
(2019)
Pluripotent stem cells give rise to reproductively enabled offsprings by generating progressively lineage-restricted multipotent stem cells that would differentiate into lineage-committed stem and progenitor cells. These lineage-committed stem and progenitor cells give rise to all adult tissues and organs. Adult stem and progenitor cells are generated as part of the developmental program and play critical roles in tissue and organ maintenance and/or regeneration. The ability of pluripotent stem cells to self-renew, maintain pluripotency, and differentiate into a multicellular organism is highly dependent on sensing and integrating extracellular and extraorganismal cues. Proteins perform and integrate almost all cellular functions including signal transduction, regulation of gene expression, metabolism, and cell division and death. Therefore, maintenance of an appropriate mix of correctly folded proteins, a pristine proteome, is essential for proper stem cell function. The stem cells' proteome must be pristine because unfolded, misfolded, or otherwise damaged proteins would interfere with unlimited self-renewal, maintenance of pluripotency, differentiation into downstream lineages, and consequently with the development of properly functioning tissue and organs. Understanding how various stem cells generate and maintain a pristine proteome is therefore essential for exploiting their potential in regenerative medicine and possibly for the discovery of novel approaches for maintaining, propagating, and differentiating pluripotent, multipotent, and adult stem cells as well as induced pluripotent stem cells. In this review, we will summarize cellular networks used by various stem cells for generation and maintenance of a pristine proteome. We will also explore the coordination of these networks with one another and their integration with the gene regulatory and signaling networks.
Das Ziel dieser retrospektiven Studie war der Vergleich zwischen den zwei am häufigsten durchgeführten mikroinzisionalen Glaukomoperationen (Trabectome und iStent inject) in Bezug auf die Reduktion des Augeninnendrucks und der Anzahl der Glaukommedikamente, da diese operative Verfahren zunehmend eine Alternative für die traditionellen Glaukomoperationen in den verschiedenen Glaukomstadien darstellen.
In dieser Studie wurden alle Patienten eingeschlossen, die in der Zeit zwischen Januar 2008 und März 2018 in unserer Klinik und Satelliten entweder Trabectome oder iStent inject bekommen haben. Die beiden Gruppen wurden in allen Fällen mit Phakoemulsifikation und Intraokularlinsenimplantation kombiniert. Um die Wahrscheinlichkeit von Exact Matching mit den neuen iStent inject zu erhöhen, wo nur wenige Daten existieren, wurden die verfügbaren Daten von iStent inject mit Daten von 3446 Patienten aus der Datenbank der Trabectome Study Group gematcht. Der postoperative Beobachtungszeitraum betrug 24 Monate. Bei jedem Patienten wurden in dieser Zeit der Augeninnendruck und die Anzahl der Glaukommedikamente analysiert. Die zwei exakt gematchten Gruppen hatten den gleichen präoperativen Augeninnendruck von 18,3 ± 5,1 mmHg und die gleiche Anzahl der präoperativ angewendeten Glaukommedikamente von 2,7 ± 1,2.
In der iStent inject Gruppe wurde ein Augeninnendruck von 14,6 ± 4,2 mmHg nach drei Monaten erreicht, der zunehmend im Verlauf ab dem sechsten Monat stieg und über dem Basisdurchschnitt am Ende der Studie lag (18,8 ± 9,0 mmHg). In der Trabectome Gruppe war der Augeninnendruck nach einem Monat auf ein Minimum von 13,1 ± 3,2 mmHg reduziert und er blieb während der gesamten Beobachtungszeit in diesem Niveau (14,2 ± 3,5 mmHg nach 24 Monaten). Die Trabectome Gruppe hatte bei allen postoperativen Nachkontrollen einen durchschnittlich niedrigeren Augeninnendruck als in der iStent inject Gruppe.
In der iStent inject Gruppe sank die Anzahl der Glaukommedikamente bis zum dritten Monat auf 1,7 ± 1,4, und dann stieg sie ab dem sechsten Monat an, sodass es im Monat 12 keinen signifikanten Unterschied im Vergleich zur präoperativen Medikamentenanzahl mehr gab (2,0 ± 1,5 nach 24 Monaten). In der Trabectome Gruppe sanken die Glaukommedikamente von der exakt gematchten Zahl der Patienten von 2,7 ± 1,2 zum Studienbeginn auf 1,6 ± 1,3 in sechs Monaten und auf 1,5 ± 1,4 nach 24 Monaten.
Unter Verwendung der Erfolgsdefinition, die üblicherweise für die mikroinzisionalen Glaukomoperationen angewendet wird (eine Augeninnendrucksenkung um ≥ 20 % des Ausgangsdrucks oder ein Augeninnendruck von < 21 mmHg), erreichten 97 % der Patienten der Trabectome Gruppe und 95 % der Patienten der iStent inject Gruppe dieses Ziel.
Dieser ausgewogene Vergleich zwischen den zwei Gruppen mittels Exact Matchings zeigte, dass die Senkung des Augeninnendrucks und der Anzahl der Glaukommedikamente bei Trabectome größer und anhaltender ist als bei iStent inject.
In this dissertation the electronic and high-energy optical properties of thin nanoscale
films of the magnetic topological insulator (MTI) (V,Cr)y(BixSb1-x)2-yTe3 are studied
by means of X-ray photoelectron spectroscopy (XPS) and electron energy-loss
spectroscopy (EELS). Magnetic topological insulators are presently of broad interest
as the combination of ferromagnetism and spin-orbit coupling in these materials
leads to a new topological phase, the quantum anomalous Hall state (QAHS), with
dissipation less conduction channels. Determining and controlling the physical
properties of these complex materials is therefore desirable for a fundamental understanding
of the QAHS and for their possible application in spintronics. EELS can
directly probe the electron energy-loss function of a material from which one can
obtain the complex dynamic dielectric function by means of the Kramers-Kronig
transformation and the Drude-Lindhard model of plasmon oscillations.
The XPS core-level spectra in (V,Cr)y(BixSb1-x)2-yTe3 are analyzed in detail with
regards to inelastic background contributions. It is shown that the spectra can be
accurately described based on the electron energy-loss function obtained from an
independent EELS measurement. This allows for a comprehensive and quantitative
analysis of the XPS data, which will facilitate future core-level spectroscopy studies
in this class of topological materials. From the EELS data, furthermore, the bulk and
surface optical properties were estimated, and compared to ab initio calculations
based on density functional theory (DFT) performed in the GW approximation
for Sb2Te3. The experimental results show a good agreement with the calculated
complex dielectric function and the calculated energy-loss function. The positions of
the main plasmon modes reported here are expected to be generally similar in other
materials in this class of nanoscale TI films. Hence, the present work introduces
EELS as a powerful method to access the high-energy optical properties of TI
thin films. Based on the presented results it will be interesting to explore more
systematically the effects of stoichiometry, magnetic doping, film thickness and
surface morphology on the electron-loss function, potentially leading to a better
understanding of the complex interplay of structural, electronic, magnetic and
optical properties in MTI nanostructures.
The coast of Aqaba and the Aqaba region (Jordan) were investigated on their hydrogeo-ecosystem. The results of the research were translated into digits to build a geo-spatial data base. The fillings of the graben aquifer receive indirect type of recharge through the side wadis which drain the highlands. Surface water balance was modeled for a period of 20 years of daily climate records using MODBIL program which attributes direct recharge to wet years only. The hydrodynamic fresh water/seawater interface in the coastal zones was investigated by applying vertical geoelectric surveys and models of several methods to confirm its coincidence with the aquifer’s flow amounts, where human impacts in terms of over-pumping allowed more encroachment of seawater into land, and unintended recharge which led to seaward interface migration. A groundwater balance and solute transport were approached by developing a flow model from the hydrogeological and hydrochemical data. The nature of soil cover and aquifer whose physical properties enhance human impacts indicated the vulnerability of groundwater to pollution. This certainly threatens the marine ecology which forms the sink where the in-excess flow ends. The constructed digital background was exported into GIS to sub-zone the study area in terms of the aquifer’s vulnerability to pollution risks using DRASTIC index. However, it was unable to meet all geo-spatial factors that proved to have significant impacts on the vulnerability. Consequently, a comprehensive index -SALUFT- was developed. This suggests the suitable land use units for each zone in the light of vulnerability grades aiming at protecting the available groundwater resources.
Verschiedene Forschungsergebnisse der letzten zehn Jahre ergaben, dass die weitaus häufigeren, nicht-syndromalen Schwerhörigkeiten durch Mutation eines Gens (GJB2-Gen) entstehen, welches im Cortischen Organ des Innenohrs exprimiert wird.
Das GJB2-Gen (Connexin-26-Gen), dessen Veränderung etwa 50 % der Fälle von autosomal rezessiver Schwerhörigkeit ausmacht, liegt im Chromosomenbereich 13q11–12.
Aktuell identifiziert sind mehr als 70 weitere Loki, die in Verbindung mit nicht-syndromalen Formen von Schwerhörigkeit stehen. Die Prävalenz von NSHL beträgt nach neusten Studien ca. 1,33 pro 1000 Neugeborenen.
In Würzburg wurden bis zum Jahr 2011 auf der Neugeborenenstation der Frauenklinik der Universitätsklinik in einem bewährten zweistufigen Neugeborenen-Hörscreening ca. 12853 Babys untersucht.
Ziel des Neugeborenen-Hörscreenings ist eine frühestmögliche Erkennung von Schwerhörigkeit bei Neugeborenen, damit durch die Behandlung eine ungehinderte Sprachentwicklung gewährleistet werden kann.
In dieser Arbeit wurde der Zusammenhang zwischen der Mutation im Connexin-26-Gen und dem Grad, dem Verlauf und der Konfiguration der Hörminderung untersucht.
Hierfür wurden 59 Patienten im Alter von 1 bis 15 Jahren mit beidseitigen, nicht-syndromalen Hörstörungen der Schallempfindung verschiedenen Grades rekrutiert.
Mithilfe der molekulargenetischen Befunde konnten Veränderungen im Connexin-26-Gen diagnostiziert werden. Anschließend wurde versucht, unter Zuhilfenahme aller vorhandenen Befunde der individuellen Audiogramm- und BERA- oder ASSR-Befunde eine Genotyp-Phänotyp-Korrelation abzuleiten.
Compared to cell therapy, where cells are injected into a defect region, the treatment of heart infarction with cells seeded in a vascularized scaffold bears advantages, such as an immediate nutrient supply or a controllable and persistent localization of cells. For this purpose, decellularized native tissues are a preferable choice as they provide an in vivo-like microenvironment. However, the quality of such scaffolds strongly depends on the decellularization process. Therefore, two protocols based on sodium dodecyl sulfate or sodium deoxycholate were tailored and optimized for the decellularization of a porcine heart. The obtained scaffolds were tested for their applicability to generate vascularized cardiac patches. Decellularization with sodium dodecyl sulfate was found to be more suitable and resulted in scaffolds with a low amount of DNA, a highly preserved extracellular matrix composition, and structure shown by GAG quantification and immunohistochemistry. After seeding human endothelial cells into the vasculature, a coagulation assay demonstrated the functionality of the endothelial cells to minimize the clotting of blood. Human-induced pluripotent-stem-cell-derived cardiomyocytes in co-culture with fibroblasts and mesenchymal stem cells transferred the scaffold into a vascularized cardiac patch spontaneously contracting with a frequency of 25.61 ± 5.99 beats/min for over 16 weeks. The customized decellularization protocol based on sodium dodecyl sulfate renders a step towards a preclinical evaluation of the scaffolds.
Cardiovascular diseases are considered the leading cause of death worldwide according to the World Health Organization. Heart failure is the last stage of most of these diseases, where loss of myocardium leads to architectural and functional decline.
The definitive treatment option for patients with CVDs is organ or tissue transplantation, which relies on donor availability. Therefore, generating an autologous bioengineered myocardium or heart could overcome this limitation. In addition, generating cardiac patches will provide ventricular wall support and enable reparative stem cells delivery to damaged areas. Although many hurdles still exist, a good number of researches have attempted to create an engineered cardiac tissue which can induce endogenous cardiac repair by replacing damaged myocardium.
The present study provided cardiac patches in two models, one by a detergent coronary perfusion decellularization protocol that was optimized, and the other that resulted in a 3D cell-free extracellular matrix with intact architecture and preserved s-glycosaminoglycan and vasculature conduits. Perfusion with 1% Sodium dodecyle sulfate (SDS) under constant pressure resulted in cell-free porcine scaffold within two and cell-free rat scaffold in 7 days, whereas scaffold perfused with 4% sodium deoxycholate (SDO) was not able to remove cells completely. Re-reendothelialization of tissue vasculature was obtained by injecting human microvascular endothelial cell and human fibroblast in 2:1 ratio in a dynamic culture. One-week later, CD31 positive cells and endothelium markers were observed, indicating new blood lining. Moreover, functionality test of re-endothelialized tissue revealed improvement in clotting seen in decellularized tissues. When the tissue was ready to be repopulated, porcine induced pluripotent stem cells (PiPSc) were generated by transfected reprogramming of porcine skin fibroblast and then differentiated to cardiac cells following a robust protocol, for an autologous cardiac tissue model. However, due to the limitation in the PiPSc cell number, alternatively, human induced pluripotent stem cells generated cardiac cells were used.
For reseeding a coculture of human iPSc generated cardiac cells, human mesenchymal stem cells and human fibroblast in 2:1:1 ratio respectively were used in a dynamic culture for 6-8 weeks. Contractions at different areas of the tissue were recorded at an average beating rate of 67 beats/min. In addition, positive cardiac markers (Troponin T), Fibroblast (vemintin), and mesenchymal stem cells (CD90) were detected. Not only that, but by week 3, MSC started differentiating to cardiac cells progressively until few CD90 positive cells were very few by week 6 with increasing troponin t positive cells in parallel. Electrophysiological and drug studies were difficult to obtain due to tissue thickness and limited assessment sources. However, the same construct was established using small intestine submucosa (SISer) scaffold, which recorded a spontaneous beating rate between 0.88 and 1.2 Hz, a conduction velocity of 23.9 ± 0.74 cm s−1, and a maximal contraction force of 0.453 ± 0.015 mN. Moreover, electrophysiological studies demonstrated a drug-dependent response on beating rate; a higher adrenalin frequency was revealed in comparison to the untreated tissue and isoproterenol administration, whereas a decrease in beating rate was observed with propranolol and untreated tissue.
The present study demonstrated the establishment of vascularized cardiac tissue, which can be used for human clinical application.
The objective was to determine the mRNA expression and protein levels of uPA system components in tissue specimens and serum samples, respectively, from prostate cancer (PCa) patients and to assess their association with clinicopathological parameters and overall survival (OS). The mRNA expression levels of uPA, its receptor (uPAR), and its inhibitor type 1 (PAI-1) were analyzed in corresponding malignant and adjacent nonmalignant tissue specimens from 132 PCa patients by quantitative PCR. Preoperative serum samples from 81 PCa patients were analyzed for antigen levels of uPA system members by ELISA. RNA levels of uPA system components displayed significant correlations with each other in the tumor tissues. A significantly decreased uP AmRNA expression in PCa compared to the corresponding nonmalignant tissue was detected. High uPA mRNA level was significantly associated with a high Gleason score. Elevated concentration of soluble uPAR (suPAR) in serum was significantly associated with a poor OS of PCa patients (P = 0.022). PCa patients with high suPAR levels have a significantly higher risk of death (multivariate Cox's regression analysis; IIR - 7.12, P - 0.027). The association of high suPAR levels with poor survival of PCa patients suggests a prognostic impact of suPAR levels in serum of cancer patients.
The growing interest in Radio Frequency Identification (RFID) technology in recent years has sparked an intensive debate on the benefits to be expected. With the growth of RFID implementations in size and scope comes a shift away from infrastructural aspects to the question of how to draw value from the large amounts of collected data. However, the necessary procedures for the handling of massive RFID data sets are still an under-researched issue. Against this background, the study presents results from a real-world trial conducted by a large apparel retailer. The objective of the trial was to explore the opportunities for generating novel performance indicators and reports on the reality of store processes and customer behavior on the sales floor. We give an overview of the algorithms used for RFID data processing and the interpretation of the resulting insights from a practitioner’s point of view. The case example thus provides an overview of the potential of RFID as a powerful tool for assortment optimization, customer research, store layout design, and other management tasks in retail.
Die pterygospinösen Strukturen zwischen Lamina lateralis des Processus pterygoideus und einer Spina ossis sphenoidalis können in unterschiedlicher Ausprägung vorliegen. Meist ist ein Ligamentum pterygospinosum, gelegentlich ein Arcus osseus oder ein Musculus pterygospinosus vorhanden. In einzelnen Fällen können mehrere Varianten parallel vorliegen. Die knöchernen Verbindengen kommen bei Altweltaffen immer vor, beim Menschen nur noch vereinzelt. Diese Strukturen können einen operativen lateralen Zugang zur Tiefe der Fossa infratemporalis behindern. Durch radiologische Methoden können präoperativ die pterygospinösen Strukturen dargestellt werden.
Hier wird über den objektiven Vergleich der Kurz- und Langzeitergebnisse, die mit der laparoskopischen Heller-Myotomie plus Dor-Fundoplikatio (LHM + Dor) und der per-oralen endoskopischen Myotomie (POEM) an einer einzigen Institution erzielt wurden und über die Entwicklung eines "maßgeschneiderten Ansatzes" berichtet. Die laparosko-pischen Heller Myotomie (LHM) gilt aktuell als das Standardverfahren zur Therapie der Achalasie. Die perorale endoskopische Myotomie (POEM) bietet eine neue Alternative zur Durchführung der Heller-Myotomie auf endoskopischem und natural orifice translu-minal endoscopic surgery (NOTES) Wege.
Wir berichten über unsere unselektierte konsekutive Patientenserien (n = 238), die zwi-schen 2009 und 2017 entweder einer LHM + Dor Prozedur (n = 100) oder einer POEM Operation (n = 138) unterzogen wurden.
Es gab keine Unterschiede hinsichtlich des Behandlungserfolgs (Eckardt-Score ≤ 3) nach 3 - 6 Monaten (LHM: 90,1% vs. POEM: 90,5%; p = 0,735), 12 Monate (LHM 84,4% vs. POEM 84,0%; p = 0,766 und> 2 Jahre (LHM 81,1% vs. POEM 79,2%; p = 0,432). Die Verbesserung der Lebensqualität (GIQLI-Score) und die Patientenzufriedenheit waren in beiden Gruppen ebenfalls ver-gleichbar gut (~ 90%) und zu jedem Zeitpunkt der Nachbeobachtung. Refluxraten sind ebenfalls ähnlich (Sodbrennen LHM: 32,9% vs. POEM: 30,1%; Ösophagitis LHM: 16,3% vs. POEM: 14,6%; PPI-Aufnahme 21,2% vs. 32,5%, pathologischer pH-Wert -Meter-LHM: 8,8% vs. POEM: 23,3%) ohne Signifikanz der Unterschiede.
Die „maßgeschneiderte Verfahrenswahl POEM vs. LHM“ könnte geeignet sein und sollte in weiteren Studien weiter untersucht werden.
Two phases of reef sampling were carried out. The first included regular samples taken along the coastline of Aqaba (27km long) at depths of 4-15m, and used to determine spatial distribution of pollution. The second phase included three 20cm-deep cores obtained from within the industrial zone. These cores were drilled from pre-dated communities, where the growth rate was determined earlier to be 10mm y-1, therefore the core obtained represented a period of 20 years (i.e. 1980-2000). The cores were used to reconstruct the metal pollution history at the most heavily used site along the coast (industrial zone).All samples were examined with respect to their metal content of Cd, Pb, Cu, Zn, Ni, and Cr. Almost all of them have shown records above the calculated background values. Mean values of Cd, Pb, Cu, Zn, Ni and Cr recorded along the coast were 1,25; 4,26; 9,76; 11,40; 2,29 and 10,522, µg g-1 respectively, and for core samples 1.4; 4.2; 5.7; 6.4; 2.3 and 8.21 µg g-1 respectively. Spatial distribution of metal enrichment in reef samples have shown a general and clear increasing trend towards the south. Same increasing trend was also in core samples where the six metals have shown a prominent increasing trend towards the core surface indicating an increase of coastal activities during the last twenty years. High and relatively high values were recorded at the oil port, the industrial area and main port, and thus categorized as highly impacted areas. Intermediate metal content were recorded in samples of the north beach, and thus classified as being relatively impacted, where the lowest metal concentrations were observed at the marine reserve, the least impacted site along the coast. The high enrichment of metal is attributed mainly to anthropogenic impacts. The natural inputs of the six metals studied in the Gulf of Aqaba are generally very low, due to the geographic positions and the absence of wadi discharge and as a result of low rainfall. Several potential sources of heavy metals were investigated. The industrial-related activities, port operations and phosphate dust were among the main sources currently threatening the marine ecosystem in Aqaba. Applying the Principle Components Analysis method (PCA) to all samples taken along the coastline has resulted in categorizing three different groups according to their metal enrichment, the first is composed of samples taken from the north beach and the main port with intermediate to high enrichment, the second joined the samples of the marine park and the marine reserve with low and relatively low enrichment, and the last group joined samples of the industrial zone and the oil port with high enrichment. The Principle Component Scores were also utilized to confirm the spatial distribution and relationships of the examined heavy metals along the coast. Two models (interpolated by SURFER  7.0 and ArcView 3.2a) were developed, the first was based on the PC scores of the first component, and shows clearly the positive anomalies in metal concentrations along the coast. The second model was developed by plotting the second factor scores on a landuse map of Aqaba. According to these models, it has shown that the positive anomalies are associated with three different zones; industrial area, the main port and the oil port. The results have shown that coral reefs can be used as good environmental indicator for assessments and monitoring processes, and they can provide data and information on both the spatial distribution of pollution and their history. The present work is the first to document the environmental status along the whole coast of Aqaba and the first to use coral reef as a tool/ indicator.
Olea europaea L. Cv. Arbequina (OEA) (Oleaceae) is an olive variety species that has received little attention. Besides our previous work for the chemical profiling of OEA leaves using LC–HRESIMS, an additional 23 compounds are identified. An excision wound model is used to measure wound healing action. Wounds are provided with OEA (2% w/v) or MEBO\(^®\) cream (marketed treatment). The wound closure rate related to vehicle-treated wounds is significantly increased by OEA. Comparing to vehicle wound tissues, significant levels of TGF-β in OEA and MEBO\(^®\) (p < 0.05) are displayed by gene expression patterns, with the most significant levels in OEA-treated wounds. Proinflammatory TNF-α and IL-1β levels are substantially reduced in OEA-treated wounds. The capability of several lignan-related compounds to interact with MMP-1 is revealed by extensive in silico investigation of the major OEA compounds (i.e., inverse docking, molecular dynamics simulation, and ΔG calculation), and their role in the wound-healing process is also characterized. The potential of OEA as a potent MMP-1 inhibitor is shown in subsequent in vitro testing (IC\(_{50}\) = 88.0 ± 0.1 nM). In conclusion, OEA is introduced as an interesting therapeutic candidate that can effectively manage wound healing because of its anti-inflammatory and antioxidant properties.
Migration and interactions of immune cells are routinely studied by time-lapse microscopy of in vitro migration and confrontation assays. To objectively quantify the dynamic behavior of cells, software tools for automated cell tracking can be applied. However, many existing tracking algorithms recognize only rather short fragments of a whole cell track and rely on cell staining to enhance cell segmentation. While our previously developed segmentation approach enables tracking of label-free cells, it still suffers from frequently recognizing only short track fragments. In this study, we identify sources of track fragmentation and provide solutions to obtain longer cell tracks. This is achieved by improving the detection of low-contrast cells and by optimizing the value of the gap size parameter, which defines the number of missing cell positions between track fragments that is accepted for still connecting them into one track. We find that the enhanced track recognition increases the average length of cell tracks up to 2.2-fold. Recognizing cell tracks as a whole will enable studying and quantifying more complex patterns of cell behavior, e.g. switches in migration mode or dependence of the phagocytosis efficiency on the number and type of preceding interactions. Such quantitative analyses will improve our understanding of how immune cells interact and function in health and disease.
The role of vessel wall-resident stem cells in the generation of microglia and angiogenisis in the adult CNS
Das Zentralnervensystem (ZNS) wird kontinuierlich durch ein eigenes Immunsystem überwacht. Die Mikroglia sind ein wichtiger Vertreter dieses Immunsystems und ein besonderes Charakteristikum des ZNS. Für die Aufrechterhaltung der Hämostase im ZNS spielen die Mikroglia eine zentrale Rolle. Die Herkunft der Mikroglia war für lange Zeit Gegenstand der kontroversen wissenschaftlichen Diskussion. Zusammengefasst wurde deren Ursprung als hämatopoetisch, mesodermal und neuroektodermal beschrieben. Allerdings überwiegt derzeit die Meinung, dass die Mikroglia von Vorläuferzellen geliefert wird, die während der Embryonalentwicklung aus der Dottersackwand ins Gehirn migrieren, dort bis zum Erwachsenenalter persistieren und immer wieder zur Erneuerung der Mikroglia herangezogen werden. Wo genau im Hirngewebe derartige oder andere potenzielle Mikrogliavorläuferzellen im ZNS residieren, ist bis heute nicht abschließend geklärt.
In der vorliegenden Arbeit konnte gezeigt werden, dass bereits die frisch präparierten Hirngefäße sowohl CD44+ als auch CD45+ Zellen in ihren Wänden aufweisen. Außerdem ließ sich beobachten, dass die CD44+ Zellen im BRA nach außen wanderten und sich zu Perizyten-ähnlichen und glatten Muskelzellen differenzierten. Diese Befunde ließen darauf schließen, dass die CD44+ Zellen mit diesen Eigenschaften das Potenzial haben, zur Gefäßneubildung beizutragen. Darüber hinaus konnten CD45+ Zellen in der Adventitia frisch isolierter Hirngefäße nachgewiesen werden, die im BRA teilweise für F4/80 und/oder Iba-1 positiv wurden. Dies wiederum lässt vermuten, dass aus der Wand der Hirngefäße Mikroglia- und Makrophagen-ähnliche Zellen generiert werden können. Es blieb jedoch offen, ob diese CD45+ Vorläuferzellen dauerhaft in der Adventitia der Hirngefäße residieren oder aber immer wieder durch im Blut zirkulierende Monozyten erneuert werden. Diese Frage zu klären, ist von klinischer Relevanz, bleibt jedoch zukünftigen Arbeiten überlassen. Das hier etablierte BRA könnte auch bei solchen Analysen hilfreich sein.
We consider the process of muon-electron elastic scattering, which has been proposed as an ideal framework to measure the running of the electromagnetic coupling constant at space-like momenta and determine the leading-order hadronic contribution to the muon g-2 (MUonE experiment). We compute the next-to-leading (NLO) contributions due to QED and purely weak corrections and implement them into a fully differential Monte Carlo event generator, which is available for first experimental studies. We show representative phenomenological results of interest for the MUonE experiment and examine in detail the impact of the various sources of radiative corrections under different selection criteria, in order to study the dependence of the NLO contributions on the applied cuts. The study represents the first step towards the realisation of a high-precision Monte Carlo code necessary for data analysis.
The Urban Heat Island (UHI) is the phenomenon of altered increased temperatures in urban areas compared to their rural surroundings. UHIs grow and intensify under extreme hot periods, such as during heat waves, which can affect human health and also increase the demand for energy for cooling. This study applies remote sensing and land use/land cover (LULC) data to assess the cooling effect of varying urban vegetation cover, especially during extreme warm periods, in the city of Munich, Germany. To compute the relationship between Land Surface Temperature (LST) and Land Use Land Cover (LULC), MODIS eight-day interval LST data for the months of June, July and August from 2002 to 2012 and the Corine Land Cover (CLC) database were used. Due to similarities in the behavior of surface temperature of different CLCs, some classes were reclassified and combined to form two major, rather simplified, homogenized classes: one of built-up area and one of urban vegetation. The homogenized map was merged with the MODIS eight-day interval LST data to compute the relationship between them. The results revealed that (i) the cooling effect accrued from urban vegetation tended to be non-linear; and (ii) a remarkable and stronger cooling effect in terms of LST was identified in regions where the proportion of vegetation cover was between seventy and almost eighty percent per square kilometer. The results also demonstrated that LST within urban vegetation was affected by the temperature of the surrounding built-up and that during the well-known European 2003 heat wave, suburb areas were cooler from the core of the urbanized region. This study concluded that the optimum green space for obtaining the lowest temperature is a non-linear trend. This could support urban planning strategies to facilitate appropriate applications to mitigate heat-stress in urban area.
5.1 Immuntherapie mit vom Tumorstroma abgeleiteten Peptiden Tumore bestehen nicht nur aus Tumorzellen, sondern auch aus der sie umgebenden extrazellulären Matrix (EZM), und Stromazellen wie Fibroblasten (cancer-associated fibroblast; CAF) und Endothelzellen (tumor endothelial cell; TEC). Diese Stromazellen haben durch die Ausschüttung von Zytokinen, proteolytischen Enzymen, Wachstums- und Angiogenesefaktoren einen entscheidenden Einfluss auf die Tumorprogression. Sie unterscheiden sich von den Stromazellen der normalen Gewebe durch die Expression von sogenannten Tumorstroma-assoziierten Antigenen (TSAA). Damit sollten Therapien, die auf TSAA abzielen, universell einsetzbar und weniger anfällig gegenüber Resistenzentwicklungen (immune escape Mechanismen) sein, da Stromazellen im Gegensatz zu neoplastischen Zellen genetisch relativ stabil sind. Für eine Immuntherapie mit vom Tumorstroma abgeleiteten Peptiden wählten wir die TSAA Endoglin und Fap, welche während der Wundheilung und im Tumorstroma induziert werden. Dabei sollte überprüft werden, ob prophylaktische Vakzinierungen in C57Bl/6j Mäusen Peptid-reaktive T-Zellen induzieren können, und das Wachstum von transplantieren Grm1-transgenen Tumoren reduziert werden kann. In der Tat konnten wir sowohl bei Endoglin- als auch bei Fap Peptid vakzinierten Tieren in vivo Peptid-reaktive Lymphozyten im Blut und zu einem geringeren Anteil auch in der Milz nachweisen, welche Peptid-gepulste syngene Milzzellen lysieren konnten. Allerdings konnte in beiden Fällen keine Reduktion des Tumorwachstums gegenüber der Kontrollgruppe beobachtet werden. Bei der Fap-Peptid-vakzinierten Gruppe war das Tumorwachstum gegenüber der Kontrollgruppe sogar gesteigert. Dies könnte darauf hindeuten, dass die Induktion Fap-Peptid-reaktiver T-Zellen tumorpromovierend wirkt. Möglicherweise könnte aber durch eine Modifikation des Vakzinierungsprotokolls bzw. durch eine Kombination mit anderen Immuntherapeutika ein verbessertes Ansprechen auf eine Endoglin bzw. Fap basierte Immuntherapie erzielt werden. 5.2 Immunsuppressive Mechanismen im Grm1-transgenen Melanom-Modell Grm1-transgene Mäuse entwickeln spontan kutane Melanome. Dieses Modell erlaubte es uns in der vorliegenden Arbeit spontane Immunantworten im Laufe der Melanomentstehung zu untersuchen. Hierfür analysierten wir sowohl ex vivo als auch in vitro aus Milz und Lymphknoten gewonnene Lymphozyten von Mäusen, welche keine Tumorläsionen bzw. eine niedrige oder hohe Tumorlast aufwiesen. Dabei konnten wir ex vivo einen Anstieg der Frequenz aktivierter CD4+ und CD8+ Lymphozyten mit zunehmender Tumorlast zeigen. Bei tumortragenden Tieren exprimierten jedoch hauptsächlich CD4+ T-Zellen Aktivierungsmarker nach in vitro Stimulation. Interessanterweise waren diese Zellen tumortragender Tiere auch funktionell beeinträchtigt, was sich in einer verminderten Proliferationskapazität nach in vitro Stimulation zeigte. Weitere Analysen ergaben, dass die erhöhte Frequenz regulatorischer T Zellen bei tumortragenden Tieren ein frühes Ereignis im Laufe der Tumorentstehung ist. Gleichzeitig konnte auch ein starker Anstieg der immunsupprimierenden Zytokine Tgf-β1 und Il-10 sowohl in den Lymphknoten als auch im Tumorgewebe beobachtet werden. Dabei war die Tgf-β1-Expression sowohl im Tumor als auch im tumor-drainierenden Lymphknoten erhöht, während Il-10 im Tumor nur moderat exprimiert wurde, was eine komplexere Regulation der Il-10-Expression nahe legt. Dies bedeutet, dass in Grm1-transgenen Mäusen ähnlich wie auch bei Melanompatienten zelluläre und zytokinabhängige Mechanismen zur Tumorentstehung beitragen und dieses Modell daher geeignet ist, um präklinisch immunmodulierende Therapieansätze zu testen.
Cellular and cytokine-dependent immunosuppressive mechanisms of grm1-transgenic murine melanoma
(2012)
Grm1-transgenic mice spontaneously develop cutaneous melanoma. This model allowed us to scrutinize the generic immune responses over the course of melanoma development. To this end, lymphocytes obtained from spleens, unrelated lymph nodes and tumor-draining lymph nodes of mice with no evidence of disease, and low or high tumor burden were analyzed ex vivo and in vitro. Thereby, we could demonstrate an increase in the number of activated CD4\(^+\) and CD8+ lymphocytes in the respective organs with increasing tumor burden. However, mainly CD4\(^+\) T cells, which could constitute both T helper as well as immunosuppressive regulatory T cells, but not CD8\(^+\) T cells, expressed activation markers upon in vitro stimulation when obtained from tumor-bearing mice. Interestingly, these cells from tumor-burdened animals were also functionally hampered in their proliferative response even when subjected to strong in vitro stimulation. Further analyses revealed that the increased frequency of regulatory T cells in tumor-bearing mice is an early event present in all lymphoid organs. Additionally, expression of the immunosuppressive cytokines TGF-β1 and IL-10 became more evident with increased tumor burden. Notably, TGF-β1 is strongly expressed in both the tumor and the tumor-draining lymph node, whereas IL-10 expression is more pronounced in the lymph node, suggesting a more complex regulation of IL-10. Thus, similar to the situation in melanoma patients, both cytokines as well as cellular immune escape mechanisms seem to contribute to the observed immunosuppressed state of tumor-bearing grm1-transgenic mice, suggesting that this model is suitable for preclinical testing of immunomodulatory therapeutics.
In dieser Arbeit wird die intraoperative Boost-Bestrahlung mit 9 oder 20 Gy bei Mammakarzinompatientinnen evaluiert. Es werden das onkologische Ergebnis, die bestrahlungsassoziierte Toxizität, das kosmetische Therapieergebnis und die Lebensqualität ausgewertet. Die Analyse bezieht sich auf 124 Fälle im frühen Brustkrebsstadium.
Neurotrophine beeinflussen durch die Modulation von Prozessen wie Zellproliferation, -migration, Apoptose und Synapsenbildung entscheidend die neuronale Plastizität. Sie gelten deshalb als Kandidatengene neuronaler Entwicklungsstörungen wie Autismus-Spektrum-Störungen (ASS). Die vorgelegte Arbeit zielt auf die weitere Klärung der Rolle von Brain Derived Neurotrophic Factor (BDNF) bei der Ätiopathophysiologie der ASS durch Expressionsanalysen im Blut als potenziellem Surrogat zentralnervöser Prozesse.
In gut charakterisierten ASS-Stichproben und - neben gesunden Kontrollprobanden - einer klinischen Kontrollgruppe von Patienten mit Aufmerksamkeitsdefizit-/ Hyperaktivitätsstörung (ADHS) wurde die BDNF-mRNA-Expression in Vollblut sowie BDNF-Proteinserumkonzentrationen untersucht. Zusätzlich wurden mögliche Einflussfaktoren auf die BDNF-Werte wie Alter, IQ, autismusspezifische Symptomatik, Komorbidität und Medikation analysiert.
In einer ersten Stichprobe (ASS-Patienten versus gesunde Kontrollen) wurden
signifikant erniedrigte BDNF-Serumkonzentrationen in der Patientengruppe mittels
Enzyme-Linked-Immunosorbent-Assay gemessen (p = 0,040). In einer zweiten unabhängigen Stichprobe (Patienten mit ASS, Patienten mit ADHS und gesunde Kontrollen) wurde auf mRNA-Ebene mittels quantitativer Real-Time-Polymerasekettenreaktion ebenfalls ein signifikanter Gruppenunterschied ermittelt mit erniedrigter BDNF-Expression in der ASS-Gruppe im Vergleich zu gesunder Kontrollgruppe (p = 0,011), sowie einem Trend zu erniedrigten BDNF-Werten bei ADHS-Patienten im Vergleich zu gesunden Probanden (p = 0,097). Des Weiteren wurde eine signifikante negative Korrelation zwischen Alter und BDNF-mRNA-Expression bei Patienten mit ASS sowie eine positive Korrelation von Alter und BDNF-Serumkonzentrationen bei gesunden Kontrollen gemessen. Auch korrelierten die BDNF-Werte im Serum mit der Ausprägung des autistischen Phänotyps. In einer Subgruppe der ADHS-Patienten wurde kein Einfluss von Psychostimulanzien auf die BDNF-mRNA-Expression gemessen.
Der Einbezug größerer Stichproben sowie die systematische Erfassung weiterer potenzieller Einflussfaktoren auf die BDNF-Expression (wie pubertärer Entwicklungsstand bzw. Geschlechtshormonkonzentrationen) könnten in zukünftigen Studien zu einer weiteren Klärung der pathophysiologischen Rolle von BDNF bei Kindern und Jugendlichen mit ASS beitragen.
Neurotrophine beeinflussen durch die Modulation von Prozessen wie Zellproliferation, -migration, Apoptose und Synapsenbildung entscheidend die neuronale Plastizität. Sie gelten deshalb als Kandidatengene neuronaler Entwicklungsstörungen wie Autismus-Spektrum-Störungen (ASS). Die vorgelegte Arbeit zielt auf die weitere Klärung der Rolle von Brain Derived Neurotrophic Factor (BDNF) bei der Ätiopathophysiologie der ASS durch Expressionsanalysen im Blut als potenziellem Surrogat zentralnervöser Prozesse.
In gut charakterisierten ASS-Stichproben und - neben gesunden Kontrollprobanden - einer klinischen Kontrollgruppe von Patienten mit Aufmerksamkeitsdefizit-/ Hyperaktivitätsstörung (ADHS) wurde die BDNF-mRNA-Expression in Vollblut sowie BDNF-Proteinserumkonzentrationen untersucht. Zusätzlich wurden mögliche Einflussfaktoren auf die BDNF-Werte wie Alter, IQ, autismusspezifische Symptomatik, Komorbidität und Medikation analysiert.
In einer ersten Stichprobe (ASS-Patienten versus gesunde Kontrollen) wurden
signifikant erniedrigte BDNF-Serumkonzentrationen in der Patientengruppe mittels
Enzyme-Linked-Immunosorbent-Assay gemessen (p = 0,040). In einer zweiten unabhängigen Stichprobe (Patienten mit ASS, Patienten mit ADHS und gesunde Kontrollen) wurde auf mRNA-Ebene mittels quantitativer Real-Time-Polymerasekettenreaktion ebenfalls ein signifikanter Gruppenunterschied ermittelt mit erniedrigter BDNF-Expression in der ASS-Gruppe im Vergleich zu gesunder Kontrollgruppe (p = 0,011), sowie einem Trend zu erniedrigten BDNF-Werten bei ADHS-Patienten im Vergleich zu gesunden Probanden (p = 0,097). Des Weiteren wurde eine signifikante negative Korrelation zwischen Alter und BDNF-mRNA-Expression bei Patienten mit ASS sowie eine positive Korrelation von Alter und BDNF-Serumkonzentrationen bei gesunden Kontrollen gemessen. Auch korrelierten die BDNF-Werte im Serum mit der Ausprägung des autistischen Phänotyps. In einer Subgruppe der ADHS-Patienten wurde kein Einfluss von Psychostimulanzien auf die BDNF-mRNA-Expression gemessen.
Der Einbezug größerer Stichproben sowie die systematische Erfassung weiterer potenzieller Einflussfaktoren auf die BDNF-Expression (wie pubertärer Entwicklungsstand bzw. Geschlechtshormonkonzentrationen) könnten in zukünftigen Studien zu einer weiteren Klärung der pathophysiologischen Rolle von BDNF bei Kindern und Jugendlichen mit ASS beitragen.
Hintergrund: Über die psychische Gesundheit von Asylsuchenden in Deutschland ist wenig bekannt. Ziel dieser Studie ist, (1) die psychische Gesundheit der Asylsuchenden in der Würzburger Gemeinschaftsunterkunft zu beschreiben, (2) ihre Wahrnehmung der aktuellen Lebensbedingungen zu erfassen, sowie (3) mögliche Zusammenhänge zwischen beiden Bereichen zu untersuchen. Methoden: Alle Bewohner der Würzburger Gemeinschaftsunterkunft, welche zum Zeitpunkt der Befragung mindestens 16 Jahre alt waren und den Studienfragebogen in einer der Sprachen Arabisch, Amharisch, Farsi, Russich, Somali, Deutsch oder Englisch ausfüllen konnten, konnten an dieser Querschnittbefragung teilnehmen. Das Vorhandensein von psychischen Erkrankungen (Somatoformes Syndrom, Depressive Syndrome, Angstsyndrome, Alkoholsyndrom und eine Screeningfrage für PTBS), sowie das Ausmaß an psychosozialem Stress wurden mittels des PRIME-MD Patient Health Questionnaire (PHQ) gemessen. Die subjektive Einschätzung der Lebensbedingungen durch die Teilnehmer wurde mit einem für die spezifischen Bedingungen entwickelten Fragebogen erfasst. Die Ergebnisse wurden deskriptiv dargestellt und Korrelationen zwischen der Bewertung der Lebensbedingungen und ausgewählten Parametern der psychischen Gesundheit wurden mittels Chi-Quadrat-Tests und des Spearman Rangkorrelationskoeffizienten berechnet. Ergebnisse: Insgesamt nahmen 183 Bewohner an der Befragung teil. Der PHQ konnte für 140 Teilnehmer ausgewertet werden, der Fragebogen zu aktuellen Lebensbedingungen für 113 Teilnehmer. Die häufigsten PHQ-Syndrome waren das Somatoforme Syndrom (38,6%; n=54), Depressive Syndrome (25,7% (n=36) Major Depressives Syndrom; 22,8% (n=32) andere depressive Syndrome) und Angstsyndrome (11,4% (n=16) Paniksyndrom, 9,3% (n=13) andere Angstsyndrome). Bei 38,6% (n=54) ergab der PHQ für mehr als ein Syndrom ein positives Ergebnis. Die Lebensbedingungen in der Gemeinschaftsunterkunft wurden größtenteils negativ bewertet und ihre Auswirkungen auf die eigene Gesundheit wurden im Mittel als „ziemlich stark“ beurteilt. Eine schlechtere Bewertung der Lebensbedingungen und eine längere Aufenthaltsdauer in der Gemeinschaftsunterkunft waren in univariaten Analysen mit einem schlechteren Ergebnis bezüglich verschiedener Parameter der psychischen Gesundheit assoziiert (z.B. depressive Syndrome, psychosoziale Belastung). Schlussfolgerung: Verschiedene Limitationen der Studie müssen berücksichtigt werden (z.B. Querschnittdesign, mangelnde Validierung der Fragebogenübersetzungen). Dennoch zeigen diese Ergebnisse eine deutliche Unzufriedenheit der Studienteilnehmer mit den Lebensbedingungen in der Gemeinschaftsunterkunft auf und lassen eine hohe Prävalenz psychischer Erkrankungen in der Studienpopulation vermuten.
Im Katabolismus methylverzweigter Fettsäuren spielt die alpha-Methylacyl-CoA-Racemase eine wichtige Rolle, indem sie die (R)- und (S)-Isomere von alpha-methylverzweigten Fettsäuren als Coenzym A Thioester racemisiert. Methylverzweigte Fettsäuren entstehen beim Abbau von Isoprenoiden und werden darüber hinaus auch von vielen Organismen, wie z.B. Mycobakterien, synthetisiert. Die Hauptaufgabe der Racemase ist aber vermutlich in der Biosynthese von Gallensäuren zu sehen. Das Ziel der vorliegenden Arbeit war es, die alpha-Methylacyl-CoA-Racemase aus humanem Gewebe zu reinigen und zu charakterisieren sowie ihre physiologische Rolle im Katabolismus verzweigtkettiger Fettsäuren und der Gallensäurebiosynthese zu untersuchen. Die alpha-Methylacyl-CoA-Racemase wurde aus humanem Gewebe zur Homogenität gereinigt, umfassend biochemisch charakterisiert und zur genauen molekularbiologischen Analyse in E.coli kloniert. Die Aktivität der Racemase wurde anhand der [³H]H2O-Freisetzung aus [alpha-³H]-a-Methylacyl-CoAs bestimmt. Die humane Racemase ist in der aktiven Form ein monomeres Protein und besteht aus 382 Aminosäuren. Als Substrate akzeptiert das Enzym ein breites Spektrum von alpha-Methylacyl-CoAs. Neben den Coenzym A-Thioestern alpha-methylverzweigter Fettsäuren, wie Pristansäure, werden auch CoA-Ester von Steroidderivaten, z.B. des Gallensäureintermediats Trihydroxycoprostansäure, und aromatischen Phenylpropionsäuren, wie dem Analgetikum Ibuprofen, umgesetzt. Freie Fettsäuren, geradkettige oder beta-methylverzweigte Acyl-CoAs werden nicht racemisiert. Die alpha-Methylacyl-CoA-Racemase ist im Menschen zu ca. 80 Prozent auf die Peroxisomen und ca. 20 Prozent auf die Mitochondrien verteilt, wobei entsprechende peroxisomale (PTS 1) und mitochondriale (MTS) Transportsignale die Lokalisation bestimmen. Die vollständige cDNA-Sequenz der humanen a-Methylacyl-CoA-Racemase hat eine Gesamtlänge von 2039 Basenpaaren mit einem offenen Leseraster von 89 - 1237 bp. Das Startcodon ATG ist in eine klassische Kozak-Sequenz zum Translationsstart eingebettet. Die Protein endet am C-Terminus mit dem Sequenzmotiv –KASL, das dem peroxisomalen Transportsignal (PTS I) einiger Säugetierkatalasen entspricht. Aufgrund alternativer Polyadenylierung sind in allen untersuchten menschlichen Geweben Transkripte von 1,6 kb bzw. 2,0 kb zu finden. Es liegt keine gewebsabhängige Polyadenylierung vor, die Racemase wird aber gewebsspezifisch exprimiert (besonders stark in Leber und Niere). Das humane Racemasegen liegt auf dem kurzen Arm des Chromosoms 5 nahe am Centromer (5p1.3), im Intervall von D5S651 (46,6 cM) und D5S634 (59.9 cM).
Ausgehend von einer potentiell anti-Tumor-aktiven B-Zellen des menschlichen Immunsystem haben sich durch die Untersuchung des peripheren Blutes auf das Vorliegen von lambda3r-positiven, CD19+B-Zellen bei Magenkarzinompatienten und Probanden unterschiedlichen Alters einige sehr interessante Ergebnisse im Bereich der B-Zellimmunität ergeben. Es scheint dabei eine Art B-Zell-Immunosurveillance in Form dieser B-Zellen, sowohl bei Karzinompatienten, als auch bei Gesunden von früher Kindheit an zu geben. Die relative Verteilung dieser Zellen ändert sich dabei im Laufe des Lebens ensprechend den Veränderungen des gesamten B-Zellkompartiments. Es findet eine Abnahme mit dem Alter statt. Im Falle des Auftretens eines Magenkarzinoms kommt es dann zu einer relativen Expansion der in dieser Arbeit beschriebenen lambda3r-positiven CD19+B-Zellen trotz einer gleichzeitig stattfindenden bisher nicht erklärlichen Involution des restlichen B-Zellsystems. Bei der relativen Zunahme dieser Zellen handelt es sich um eine Art Boosterung. Das expandierte Zellkompartiment zeigt dabei Reifungstendenzen, sichtbar im Verlust des Oberflächenmoleküls IgD sowie der Expression von CD27 und IgG. Dem Oberflächenmarker CD5 scheint im Gegensatz zur initialen Hypothese bei der Erst-beschreibung der SC-1-positiven B-Zelle keine zentrale Rolle zuzukommen.
We propose that false beliefs about own current economic status are an important factor for explaining populist attitudes. Eliciting subjects’ receptiveness to rightwing populism and their perceived relative income positions in a representative survey of German households, we find that people with pessimistic beliefs about their income position are more attuned to populist statements. Key to understanding the misperception-populism relationship are strong gender differences in the mechanism: men are much more likely to channel their discontent into affection for populist ideas. A simple information provision does neither sustainably reduce misperception nor curb populism.
One of the main objectives of the ANTARES telescope is the search for point- like neutrino sources. Both the pointing accuracy and the angular resolution of the detector are important in this context and a reliableway to evaluate this performance is needed. In order to measure the pointing accuracy of the detector, one possibility is to study the shadow of the Moon, i. e. the deficit of the atmospheric muon flux from the direction of the Moon induced by the absorption of cosmic rays. Analysing the data taken between 2007 and 2016, theMoon shadow is observed with 3.5s statistical significance. The detector angular resolution for downwardgoing muons is 0.73. +/- 0.14.. The resulting pointing performance is consistent with the expectations. An independent check of the telescope pointing accuracy is realised with the data collected by a shower array detector onboard of a ship temporarily moving around the ANTARES location.
No abstract available
In den starren Molekülen 1- 10 reagieren die benachbarten parallelen C = C- und N = N-Bindungen nahezu quantitativ unter Photocyclisierung lU den l,2-Diazetidinen 11-10, deren Struktur spektroskopisch und für 13 durch Kristallstrukturanalyse bewiesen wird. Die in Abwesenheit der C = C-Bindung beobachtete Photo-Denitrogenierung unterbleibt selbst bei den empfindlichen Derivaten des 2,3-Diazabicyclo[2.2.11heptens. Photocyclisierung von 6 mit lwei zur N=N· Bindung benachbarten C=C-Bindungen tritt nur mit der Norbornendoppelbindung ein.
Der Atypische teratoid/rhabdoide Tumor (ATRT) und der primitive neuroektodermale Tumor (PNET) sind hochmaligne Tumorentitäten (WHO-Grad IV) des zentralen Nervensystems, die überwiegend im Kleinkindalter auftreten. Beide zeigen eine sehr heterogene morphologische Struktur und sind bisher nur mittels Histopathologie und Immunhistochemie voneinander zu differenzieren. Bisherige Untersuchungen ließen noch keine neuroradiologische Unterscheidbarkeit zwischen beiden Tumorentitäten erkennen. Die vorliegende Arbeit befasst sich anhand eines diesbezüglich einmalig großen Patientenkollektives (23 ATRT, 36 PNET) mit den spezifisichen morphologischen Kriterien des supratentoriellen (st) ATRT und PNET in der Magnetresonanztomographie (MRT). Die Patienten rekrutierten sich aus der multizentrischen Hirntumorstudie HIT 2000 (Teil des Kompetenznetzes der Hirntumorstudien der „Gesellschaft für pädiatrische Onkologie und Hämatologie“). Retrospektiv wurden MRT-Bilder aus einem Zeitraum von 5 Jahren ausgewertet. Untersucht wurden T1- und T2-Wichtung, nativ und unter Kontrastmittelapplikation. Zur Abgrenzung beider Entitäten voneinander wurden verschiedene Kriterien herausgearbeitet. Dazu zählten zunächst die Darstellung in der nativen T1-Wichtung, die Schärfe der Tumorbegrenzung, das zeitgleiche Vorliegen von Zysten, Ödemen und Blutungen sowie die Ausprägung des Kontrastmittel-Enhancements. Als zentrales Ergebnis der Arbeit konnte ein markantes strukturelles Muster des Kontrastmittel-Enhancements herausgearbeitet werden, welches sich als charakteristisch für den stATRT erwies, während es nur bei einem sehr geringen Prozentsatz der stPNETs anzutreffen war. Hierbei handelt es sich um ein girlandenförmiges Band, welches den Tumor randständig um eine zentrale Nekrose herum auskleidet. Dieses als „ATRT-typisch“ bezeichnete Muster wiesen zehn der stATRTs (43,5%) und drei der stPNETs (8,3%) auf. Darüber hinaus konnte man bei fünf stATRTs (21,7%) Areale mit wie in der Girlande anzutreffenden vesikulären Strukturen aber ohne begleitende zentrale Tumornekrose beobachten. Nur ein stPNET (2,8%) wies ebenfalls vesikuläre Anteile ohne zentrale Nekrose auf. Es konnten somit charakteristische Muster identifiziert werden, welche auffällig häufig in Kontrastmittel-verstärkten T1-gewichteten MRT-Bildern des stATRT in Erscheinung treten, während sie bei stPNETs nur ausgesprochen selten vorzufinden sind.
Tropische Infektionskrankheiten wie Malaria, Leishmaniose oder auch die Afrikanische Trypanosomiase sind aufgrund von zunehmenden Resistenzen der Erreger, globaler Erwärmung, aber auch von Versäumnissen in der Vergangenheit bei der kontinuierlichen Weiterentwicklung bestehender sowie der Erforschung neuer Medikamente auch im 21. Jahrhundert noch eine große Bedrohung für Millionen von Menschen. Die Suche nach neuartigen Wirkstoffen und deren Weiterentwicklung zu potenziellen Medikamenten ist daher zwingend erforderlich. Insbesondere Produkte des Sekundärstoffwechsels wie etwa die Alkaloide bilden wichtige Grundlagen als Leitstrukturen für pharmazeutische Wirkstoffe. Eine solche Klasse phytochemischen Ursprungs sind die Naphthylisochinolin-Alkaloide mit interessanten strukturellen Eigenschaften sowie pharmakologischen Wirksamkeiten. Einige Vertreter zeigen ausgeprägte In-vitro-Aktivitäten gegen protozoische Erreger wie Plasmodien, Leishmanien und Trypanosomen. Besonders die neuartige Unterklasse ionischer N,C-verknüpfter Naphthylisochinolin-Alkaloide, wie z.B. Ancistrocladinium A und Ancistrocladinium B, zeichnen sich durch gute antileishmaniale Wirkungen aus. In Vorarbeiten zeigten erste Studien zu Struktur-Aktivitäts-Beziehungen (SAR-Studien) mit vereinfachten N,C-gekuppelten Arylisochinolinen, dass sich durch gezielte Strukturvariation die Aktivität gegen einen Erreger verbessern lässt. Zusätzlich wurde mit ersten Untersuchungen zum Wirkmechanismus dieser interessanten Verbindungen begonnen. Darüber hinaus ermöglicht die kontinuierliche Verbesserung der analytischen Methoden inzwischen die schnelle und gezielte Suche nach neuen Verbindungen aus der Natur. Durch die Anwendung von Online-Analyse-Verfahren, wie z.B. die Kopplung von HPLC mit NMR und MS, gelingt die Aufklärung der Konstitution von Substanzen direkt aus Extrakten. Ziel der vorliegenden Arbeit war die Verbesserung der biologischen Aktivitäten der N,C-verknüpften Arylisochinoline durch strukturelle Derivatisierung sowie Beiträge zur Aufklärung des Wirkmechanismus mittels markierter Verbindungen. Zusätzlich sollten Naturstoffe unter Verwendung moderner HPLC-Kopplungstechniken untersucht und strukturell aufgeklärt werden.
Das Ausmaß der Proteinbindung eines Arzneistoffs wirkt sich auf viele unterschiedliche pharmakokinetische Parameter aus. So wird beispielsweise das Verteilungsvolumen, die Metabolisierung oder die Elimination des entsprechenden Stoffes durch die Höhe seiner Proteinbindung beeinflusst. Da nur der im Plasma frei vorliegende Anteil eines Arzneistoffs in der Lage ist biologische Membranen zu überwinden, können auch nur die freien Arzneistoffmoleküle eine pharmakologische Wirkung an Rezeptoren oder Enzymen auslösen. Dementsprechend ist auch die Intensität der hervorgerufenen Wirkung von der Größe des ungebundenen Anteils eines Arzneistoffs abhängig. Aufgrund dieser Zusammenhänge ist klar, dass die Proteinbindung eines Arzneistoffes letztendlich Einfluss auf die Dosisfindung hat. Zur Ermittlung der Proteinbindung stehen viele unterschiedliche Methoden, wie beispielsweise die HPLC, Kapillarelektrophorese, Ultrazentrifugation, Gleichgewichtsdialyse und Ultrafiltration zur Verfügung. In der vorliegenden Arbeit wurde die kontinuierliche Ultrafiltration zur Ermittlung der Proteinbindung von Arzneistoffen angewendet. Hier wird die Proteinbindung nicht nur anhand einer bestimmten Arzneistoff- bzw. Albuminkonzentration gemessen, sondern über einen weiteren Bereich von Wirkstoff-Protein-Verhältnissen beobachtet. Des Weiteren ist der apparative Aufwand im Vergleich zu vielen anderen Methoden als geringer einzustufen. Im Rahmen dieser Arbeit wurde, die auf der von Heinze[122] entwickelte Messanlage weiter optimiert und eine zweite Anlage mit einem Diodenarraydetektor aufgebaut. Für letztere musste eine Software-Anpassung vorgenommen werden. Folgende Projekte wurden durchgeführt: 1) Um den In-vivo-Bedingungen nahe zu kommen, wurde bei der Bestimmung der Proteinbindung der Sartane nicht nur BSA und HSA verwendet, sondern erstmals auch humanes Plasma. Die Plasmamessungen der Sartane verliefen insgesamt problemlos, allerdings ist eine erfolgreiche Messung stark von der Qualität des eingesetzten Plasmas abhängig, wie Messungen der Naphthylisochinoline gezeigt haben. Im Vergleich mit HSA und Plasma ergaben die Messungen der Sartane mit bovinem Serumalbumin geringfügig erniedrigte Proteinbindungswerte. Insgesamt sind alle Ergebnisse sehr gut mit den Literaturwerten vergleichbar. 2) Das Ausmaß der Proteinbindung von Naphthylisochinolinen war bislang unbekannt und lag im Bereich von ca. 30-70%. Erneut waren die Resultate aus den Messungen von BSA und HSA nahezu gleich. 3) Am Beispiel der Interaktion zwischen Phenprocoumon und Phenylbutazon wurden zwei unterschiedliche Ansätze getestet, um die Verdrängung aus der Proteinbindung zu simulieren. Die erste Methode entsprach hierbei einer Konkurrenz der beiden interagierenden Stoffe um die Proteinbindungsstellen. Durch den Einfluss des Phenylbutazon verringerte sich die Proteinbindung des Phenprocoumon um 1%, was allerdings als statistisch nicht signifikant betrachtet werden kann. Im zweiten Ansatz, der eine direktere Verdrängung aus der Proteinbindung simulieren sollte, fiel die Proteinbindung des Phenprocoumon gegenüber den Einzelmessungen um 2,5% ab. Unter physiologischen Konzentrationsverhältnissen sank sich die Proteinbindung des Phenprocoumon auf 93,3%. Der freie Anteil erhöhte sich dementsprechend von 1% auf 6,7%. Somit konnte der Einfluss des Phenylbutazon auf die Proteinbindung des Phenprocoumon erfolgreich nachgewiesen werden. Die unveränderte Proteinbindung des Phenylbutazon im inversen Ansatz und die ermittelten pK-Werte bestätigen diese Interaktion. Grundsätzlich ist es also möglich mit der kontinuierlichen Ultrafiltration solche Interaktionen zu simulieren. 4) Zuletzt sollte der Frage nachgegangen werden, ob es mit der kontinuierlichen Ultrafiltration auch möglich ist die Proteinbindung von wasserunlöslichen Stoffen, nämlich den Aziridinen, in Gegenwart steigender Mengen DMSO, zu bestimmen. Die erhaltenen Ergebnisse wurden mit Literaturwerten ohne DMSO-Zusatz verglichen. Abgesehen von Candesartan, das eine lineare Korrelation zwischen DMSO-Gehalt der Wirkstofflösung und Absinken der Proteinbindung zeigte, konnte kein Zusammenhang zwischen der DMSO-Konzentration und der gemessenen Proteinbindung festgestellt werden. Die Mittelwerte lagen im Bereich der Literaturwerte. Insgesamt zeigten alle Versuchsreihen, dass die kontinuierliche Ultrafiltration eine ausgezeichnete, schnelle und robuste Screeningmethode zur Bestimmung des Ausmaßes der Proteinbindung bekannter und neuer Wirkstoffe darstellt.
Neurochemische und autoradiographische Untersuchungen von Serotonin-Transporter-Knockout-Mäusen
(2004)
Um die Auswirkungen der allelischen Expressionsvariabilität des 5-HTT auf das Gehirn zu untersuchen, wurde eine transgene 5-HTT-Knockout-Maus entwickelt, die als Grundlage der Untersuchungen der vorliegenden Arbeit diente. Vor allem aufgrund der Assoziation des kurzen Allels des 5-HTT-Promotorpolymorphismus mit M. Alzheimer wurde die Untersuchung der Mäusegehirne im Hinblick auf Veränderungen von Metaboliten des oxidativen Stresses, der als ein ätiopathogenetischer Faktor bei der Entstehung des M. Alzheimer gilt, vorgenommen. Zudem wurden aufgrund der vielfältigen Interaktionen des serotonergen Systems mit den Systemen der Neurotransmitter Adenosin und Glutamat sowie aufgrund der Bedeutung des serotonergen Systems für affektive Erkrankungen autoradiographische Untersuchungen mit der Fragestellung nach Veränderungen auf Rezeptorebene im adenosinergen und glutamatergen System durchgeführt. Zur Detektion oxidativer Veränderungen wurde mit Hilfe des Malondialdehyd-Assays die Substanz Malondialdehyd als Marker für die Lipidperoxidation gemessen. Die Autoradiographie wurde mittels radioaktiv markierter Liganden für die Adenosin A1- und A2A-Rezeptoren, sowie für NMDA-, AMPA- und Kainat-Rezeptoren als Vertreter der ionotropen Glutamatrezeptoren durchgeführt. Bei der Untersuchung der Lipidperoxidation ergab sich ein signifikanter Anstieg des oxidativen Stresses im Hirnstammbereich – dem Ursprungsort der serotonergen Neurone – bei 5-HTT-Knockout-Mäusen im Vergleich zu Wildtypmäusen. Bei den heterozygoten 5-HTT-defizienten Mäusen zeigte sich lediglich eine Tendenz zu erhöhten oxidativen Veränderungen. Diese Befunde stimmen mit Ergebnissen von Untersuchungen an post-mortem Gehirnen von Alzheimer-Patienten überein. Dort wurde in früheren Arbeiten ebenfalls eine Zunahme der Lipidperoxidation gefunden, begleitet von einer Degeneration serotonerger Raphe-Neurone und dem damit einhergehenden Untergang serotonerger Terminalen in verschiedenen serotonergen Projektionsgebieten, sowie dem Auftreten neurofibrillärer Bündel und seniler Plaques in der Raphe. Der Nachweis der erhöhten Lipidperoxidation bei 5-HTT-Knockout-Mäusen erhärtet somit den Verdacht, dass das kurze Allel des 5-HTTLPR, welches mit einer geringeren Expression von 5-HTT einhergeht, einen Risikofaktor für die Entstehung von late-onset Alzheimer-Demenzen (mit spätem Beginn) darstellt. Bei 5-HTT-Knockout Mäusen besteht eine signifikante Hoch-Regulation der Adenosin A1-Rezeptoren im Nucleus raphe dorsalis. Auberdem zeigt sich ein Trend zur Herunter-Regulation der Adenosin A2A-Rezeptoren im Nucleus accumbens. In diesem Zusammenhang ist wichtig, dass Adenosin A1-Agonisten und Adenosin A2A-Antagonisten zu einer Reduktion der Freisetzung des potentiell neurotoxischen Neurotransmitters Glutamat führen. Auberdem bewirken Adenosin A1-Agonisten durch eine Hyperpolarisation eine Anhebung der Erregungsschwelle des Neurons und eine verminderte Bildung freier Radikale. Zudem induziert Adenosin die Synthese und Freisetzung von neurotrophen Faktoren und Zytokinen durch Gliazellen. Adenosin A2A-Antagonisten erhöhen zudem die Konzentration extrazellulären 5-HT´s. Die autoradiographischen Befunde können somit einerseits eine neuroprotektive Antwort auf die Erhöhung des oxidativen Stresses darstellen und zum anderen gegenregulatorisch auf die erhöhten extrazellulären 5-HT-Spiegel der 5-HTT-Knockout-Mäuse wirken. In der vorliegenden Arbeit konnten somit pathophysiologische und adaptive Veränderungen nachgewiesen werden, die die Bedeutung des serotonergen Systems für neurodegenerative Prozesse und den M. Alzheimer unterstützen.
Die vorliegende Arbeit beschäftigt sich mit der Licht-Materie-Wechselwirkung in Quantenpunkt-Mikroresonatoren und deren vertikalen und lateralen Emissionseigenschaften. Quantenpunkte sind nanoskopische Strukturen, in denen die Beweglichkeit der Ladungsträger unterhalb der de-Broglie-Wellenlänge eingeschränkt ist, wodurch die elektronische Zustandsdichte diskrete Werte annimmt. Sie werden daher auch als künstliche Atome bezeichnet. Um die Emissionseigenschaften der Quantenpunkte zu modifizieren, werden sie im Rahmen dieser Arbeit als aktive Schicht in Mikrosäulenresonatoren eingebracht. Diese bestehen aus einer GaAs lambda-Kavität, die zwischen zwei Braggspiegeln aus alternierenden GaAs und AlAs Schichten eingefasst ist. Diese Resonatoren bieten sowohl eine vertikale Emission über Fabry-Perot Moden, als auch eine laterale Emission über Flustergaleriemoden. Die Licht-Materie-Wechselwirkung zwischen den Resonatormoden und lokalisierten Ladungsträgern in den Quantenpunkten, genannt Exzitonen, kann in zwei Regime unterteilt werden. Im Regime der starken Kopplung wird der spontane Emissionsprozess in einem Quantenpunkt reversibel und das emittierte Photon kann wieder durch den Quantenpunkt absorbiert werden. Die theoretische Beschreibung der Kopplung eines Exzitons an die Resonatormode erfolgt über das Jaynes-Cummings Modell und kann im Tavis-Cummings Modell auf mehrere Emitter erweitert werden. Ist die Dämpfung des Systems zu gross, so befindet man sich im Regime der schwachen Kopplung, in dem die Emissionsrate des Quantenpunkts durch den Purcell-Effekt erhöht werden kann. In diesem Regime können Mikrolaser mit hohen Einkopplungsraten der spontanen Emission in die Resonatormode und niedrigen Schwellpumpströmen realisiert werden. Zur Charakterisierung der Proben werden vor allem die Methoden der Mikro-Elektrolumineszenz und der Photonenkorrelationsmessungen eingesetzt.
Der Krankheitsverlauf der Herzinsuffizienz ist variabel. Typischerweise treten dabei wiederholte Episoden akuter kardialer Dekompensationen auf. Prospektive Untersuchungen zu longitudinalen Veränderungen der linksventrikulären Ejektionsfraktion (LVEF) nach akuter kardialer Dekompensation, sowie assoziierter echokardiographischer, laborchemischer und klinischer Parameter fehlten bisher.
Ziel der vorliegenden Arbeit war es deshalb, die Häufigkeit einer Verbesserung bzw.
Normalisierung der LVEF innerhalb von sechs Monaten nach einer Hospitalisierung aufgrund
akuter kardialer Dekompensation mit systolischer Herzinsuffizienz (LVEF vor Entlassung aus
dem Krankenhaus ≤40%), sowie begleitende Veränderungen in Biomarkerspiegeln und
echokardiographischen Parametern, zu beschreiben, deren prognostische Relevanz zu
untersuchen und mögliche Prädiktoren zu ermitteln.
Die Ergebnisse der Arbeit zeigen, dass in den folgenden 6 Monaten nach akuter kardialer Dekompensation variable LVEF-Verläufe zu erwarten sind. Mehr als 50% der Patienten erleben ein reverses Remodelling und wechseln dadurch die LVEF-basierte Herzinsuffizienz-Kategorie. LVEF-Verbesserungen sind mit komplexen kardialen, extrakardialen und klinischen Veränderungen - im Sinne eines systemischen reversen Remodellings – assoziiert und gehen mit einer verbesserten Langzeitprognose einher. Verschiedene Prädiktoren erlauben, nach akuter kardialer Dekompensation den Verlauf bereits bei Krankenhausentlassung abzuschätzen und damit personalisierte Behandlungsstrategien für den einzelnen Patienten zu etablieren.
Prospective longitudinal follow‐up of left ventricular ejection fraction (LVEF) trajectories after acute cardiac decompensation of heart failure is lacking. We investigated changes in LVEF and covariates at 6‐months' follow‐up in patients with a predischarge LVEF ≤40%, and determined predictors and prognostic implications of LVEF changes through 18‐months' follow‐up.
Methods and Results
Interdisciplinary Network Heart Failure program participants (n=633) were categorized into subgroups based on LVEF at 6‐months' follow‐up: normalized LVEF (>50%; heart failure with normalized ejection fraction, n=147); midrange LVEF (41%–50%; heart failure with midrange ejection fraction, n=195), or persistently reduced LVEF (≤40%; heart failure with persistently reduced LVEF , n=291). All received guideline‐directed medical therapies. At 6‐months' follow‐up, compared with patients with heart failure with persistently reduced LVEF, heart failure with normalized LVEF or heart failure with midrange LVEF subgroups showed greater reductions in LV end‐diastolic/end‐systolic diameters (both P<0.001), and left atrial systolic diameter (P=0.002), more increased septal/posterior end‐diastolic wall‐thickness (both P<0.001), and significantly greater improvement in diastolic function, biomarkers, symptoms, and health status. Heart failure duration <1 year, female sex, higher predischarge blood pressure, and baseline LVEF were independent predictors of LVEF improvement. Mortality and event‐free survival rates were lower in patients with heart failure with normalized LVEF (P=0.002). Overall, LVEF increased further at 18‐months' follow‐up (P<0.001), while LV end‐diastolic diameter decreased (P=0.048). However, LVEF worsened (P=0.002) and LV end‐diastolic diameter increased (P=0.047) in patients with heart failure with normalized LVEF hospitalized between 6‐months' follow‐up and 18‐months' follow‐up.
Conclusions
Six‐month survivors of acute cardiac decompensation for systolic heart failure showed variable LVEF trajectories, with >50% showing improvements by ≥1 LVEF category. LVEF changes correlated with various parameters, suggesting multilevel reverse remodeling, were predictable from several baseline characteristics, and were associated with clinical outcomes at 18‐months' follow‐up. Repeat hospitalizations were associated with attenuation of reverse remodeling."
In the context of quantum mechanical calculations, the properties of non-adiabatic coupling in a small system, the Shin-Metiu model, is investigated.
The transition from adiabatic to non-adiabatic dynamics is elucidated in modifying the electron-nuclear interaction. This allows the comparison of weakly correlated electron-nuclear motion with the case where the strong correlations determine the dynamics.
The studies of the model are extended to include spectroscopical transitions being present in two-dimensional and degenerate four-wave mixing spectroscopy.
Furthermore, the quantum and classical time-evolution of the coupled motion in the complete electron-nuclear phase space is compared for the two coupling cases.
Additionally, the numerically exact electron flux within the weak coupling case is compared to the Born-Oppenheimer treatment.
In the last part of the thesis, the model is extended to two dimensions.
The system then possesses potential energy surfaces which exhibit a typical 'Mexican hat'-like structure and a conical intersection in the adiabatic representation.
Thus, it is possible to map properties of the system onto a vibronic coupling (Jahn-Teller) hamiltonian. Exact wave-packet propagations as well as nuclear wave-packet dynamics in the adiabatic and diabatic representation are performed.
Telemedicine uses telecommunication and information technology to provide health care services over spatial distances. In the upcoming demographic changes towards an older average population age, especially rural areas suffer from a decreasing doctor to patient ratio as well as a limited amount of available medical specialists in acceptable distance. These areas could benefit the most from telemedicine applications as they are known to improve access to medical services, medical expertise and can also help to mitigate critical or emergency situations. Although the possibilities of telemedicine applications exist in the entire range of healthcare, current systems focus on one specific disease while using dedicated hardware to connect the patient with the supervising telemedicine center.
This thesis describes the development of a telemedical system which follows a new generic design approach. This bridges the gap of existing approaches that only tackle one specific application. The proposed system on the contrary aims at supporting as many diseases and use cases as possible by taking all the stakeholders into account at the same time. To address the usability and acceptance of the system it is designed to use standardized hardware like commercial medical sensors and smartphones for collecting medical data of the patients and transmitting them to the telemedical center. The smartphone can also act as interface to the patient for health questionnaires or feedback.
The system can handle the collection and transport of medical data, analysis and visualization of the data as well as providing a real time communication with video and audio between the users.
On top of the generic telemedical framework the issue of scalability is addressed by integrating a rule-based analysis tool for the medical data. Rules can be easily created by medical personnel via a visual editor and can be personalized for each patient. The rule-based analysis tool is extended by multiple options for visualization of the data, mechanisms to handle complex rules and options for performing actions like raising alarms or sending automated messages.
It is sometimes hard for the medical experts to formulate their knowledge into rules and there may be information in the medical data that is not yet known. This is why a machine learning module was integrated into the system. It uses the incoming medical data of the patients to learn new rules that are then presented to the medical personnel for inspection. This is in line with European legislation where the human still needs to be in charge of such decisions.
Overall, we were able to show the benefit of the generic approach by evaluating it in three completely different medical use cases derived from specific application needs: monitoring of COPD (chronic obstructive pulmonary disease) patients, support of patients performing dialysis at home and councils of intensive-care experts. In addition the system was used for a non-medical use case: monitoring and optimization of industrial machines and robots. In all of the mentioned cases, we were able to prove the robustness of the generic approach with real users of the corresponding domain. This is why we can propose this approach for future development of telemedical systems.
Die Ökonomik Konrads von Megenberg gehört zu einer Literaturgattung der Antike und des Mittelalters, die sich in Anlehnung an Aristoteles‘ Oeconomica mit dem Haushalt beschäftigt. Anhand zweier Traktate aus dem Kapitel über das nicht herrschaftliche Haus wird in dieser Arbeit Konrads Sicht auf die Ehe, die Familie und die Kindererziehung mentalitäts- und alltagsgeschichtlich untersucht.
Royal jelly proteins (MRJPs) of the honeybee bear several open questions. One of them is their expression in tissues other than the hypopharyngeal glands (HGs), the site of royal jelly production. The sole MRJP-like gene of the bumblebee, Bombus terrestris (BtRJPL), represents a pre-diversification stage of the MRJP gene evolution in bees. Here we investigate the expression of BtRJPL in the HGs and the brain of bumblebees. Comparison of the HGs of bumblebees and honeybees revealed striking differences in their morphology with respect to sex- and caste-specific appearance, number of cells per acinus, and filamentous actin (F-actin) rings. At the cellular level, we found a temporary F-actin-covered meshwork in the secretory cells, which suggests a role for actin in the biogenesis of the end apparatus in HGs. Using immunohistochemical localization, we show that BtRJPL is expressed in the bumblebee brain, predominantly in the Kenyon cells of the mushroom bodies, the site of sensory integration in insects, and in the optic lobes. Our data suggest that a dual glandbrain function preceded the multiplication of MRJPs in the honeybee lineage. In the course of the honeybee evolution, HGs dramatically changed their morphology in order to serve a food-producing function.
Traumatic brain injury (TBI) is a major cause of mortality and morbidity worldwide. Despite improvements in acute intensive care, there are currently no specific therapies to ameliorate the effects of TBI. Successful therapeutic strategies for TBI should target multiple pathophysiologic mechanisms that occur at different stages of brain injury. The kallikrein-kinin system is a promising therapeutic target for TBI as it mediates key pathologic events of traumatic brain damage, such as edema formation, inflammation, and thrombosis. Selective and specific kinin receptor antagonists and inhibitors of plasma kallikrein and coagulation factor XII have been developed, and have already shown therapeutic efficacy in animal models of stroke and TBI. However, conflicting preclinical evaluation, as well as limited and inconclusive data from clinical trials in TBI, suggests that caution should be taken before transferring observations made in animals to humans. This review summarizes current evidence on the pathologic significance of the kallikrein-kinin system during TBI in animal models and, where available, the experimental findings are compared with human data.
Traumatic brain injury (TBI) induces a strong inflammatory response which includes blood-brain barrier damage, edema formation and infiltration of different immune cell subsets. More recently, microvascular thrombosis has been identified as another pathophysiological feature of TBI. The contact-kinin system represents an interface between inflammatory and thrombotic circuits and is activated in different neurological diseases. C1-Inhibitor counteracts activation of the contact-kinin system at multiple levels. We investigated the therapeutic potential of C1-Inhibitor in a model of TBI. Male and female C57BL/6 mice were subjected to cortical cryolesion and treated with C1-Inhibitor after 1 h. Lesion volumes were assessed between day 1 and day 5 and blood-brain barrier damage, thrombus formation as well as the local inflammatory response were determined post TBI. Treatment of male mice with 15.0 IU C1-Inhibitor, but not 7.5 IU, 1 h after cryolesion reduced lesion volumes by ~75% on day 1. This protective effect was preserved in female mice and at later stages of trauma. Mechanistically, C1-Inhibitor stabilized the blood-brain barrier and decreased the invasion of immune cells into the brain parenchyma. Moreover, C1-Inhibitor had strong antithrombotic effects. C1-Inhibitor represents a multifaceted anti-inflammatory and antithrombotic compound that prevents traumatic neurodegeneration in clinically meaningful settings.
Traumatic brain injury, a leading cause of death and disability, is a result of an outside force causing mechanical disruption of brain tissue and delayed pathogenic events which collectively exacerbate the injury. These pathogenic injury processes are poorly understood and accordingly no effective neuroprotective treatment is available so far. Experimental models are essential for further clarification of the highly complex pathology of traumatic brain injury towards the development of novel treatments. Among the rodent models of traumatic brain injury the most commonly used are the weight-drop, the fluid percussion, and the cortical contusion injury models. As the entire spectrum of events that might occur in traumatic brain injury cannot be covered by one single rodent model, the design and choice of a specific model represents a major challenge for neuroscientists. This review summarizes and evaluates the strengths and weaknesses of the currently available rodent models for traumatic brain injury.
The two bradykinin receptors B1R and B2R are central components of the kallikrein–kinin system with different expression kinetics and binding characteristics. Activation of these receptors by kinins triggers inflammatory responses in the target organ and in most situations enhances tissue damage. We could recently show that blocking of B1R, but not B2R, protects from cortical cryolesion by reducing inflammation and edema formation. In the present study, we investigated the role of B1R and B2R in a closed head model of focal traumatic brain injury (TBI; weight drop). Increased expression of B1R in the injured hemispheres of wild-type mice was restricted to the later stages after brain trauma, i.e. day 7 (P<0.05), whereas no significant induction could be observed for the B2R (P>0.05). Mice lacking the B1R, but not the B2R, showed less functional deficits on day 3 (P<0.001) and day 7 (P<0.001) compared with controls. Pharmacological blocking of B1R in wild-type mice had similar effects. Reduced axonal injury and astroglia activation could be identified as underlying mechanisms, while inhibition of B1R had only little influence on the local inflammatory response in this model. Inhibition of B1R may become a novel strategy to counteract trauma-induced neurodegeneration.
The bacterial pathogen Legionella pneumophila replicates intracellularly in protozoa, but can also cause severe pneumonia, called Legionnaires' disease. The bacteria invade and proliferate in the alveolar macrophages of the human lung. L. pneumophila bacteria exhibit a biphasic life cycle: replicative bacteria are avirulent; in contrast, transmissive bacteria express virulence traits and flagella. Primarily aim of this thesis was to evaluate the impact of the regulatory proteins FleQ, FleR, and RpoN in flagellar gene regulation. Phenotypic analysis, Western blot and electron microscopy of regulatory mutants in the genes coding for FleQ, RpoN and FleR demonstrated that flagellin expression is strongly repressed and that these mutants are non-flagellated in transmissive phase. Transcriptomic studies of these putative flagellar gene expression regulators demonstrated that fleQ controls the expression of numerous flagellar biosynthetic genes. Together with RpoN, FleQ controls transcription of 14 out of 31 flagellar class II genes, coding for the basal body, hook, and regulatory proteins. Unexpectedly, 7 out of 15 late flagellar genes class III and IV) are expressed dependent on FleQ but independent of RpoN. Thus, in contrast to the commonly accepted view that enhancer binding proteins as FleQ always interact with RpoN to initiate transcription, our results strongly indicate that FleQ of L. pneumophila regulates gene expression RpoN-dependent as well as RpoN-independent. Moreover, transcriptome analysis of a fleR mutant strain elucidated that FleR does not regulate the flagellar class III genes as previously suggested. Instead FleR regulates together with RpoN numerous protein biosynthesis and metabolic genes. Based on these experimental results our modified model for the transcriptional regulation of flagellar genes in L. pneumophila is that flagellar class II genes are controlled by FleQ and RpoN, while flagellar class III and IV genes are controlled in a fleQ-dependent but rpoN-independent manner. Although all L. pneumophila strains share the same complex life style, various pathotypes have evolved. This is reflected by the genomes, which contain e.g. genomic islands. The genomic island Trb-1 of L. pneumophila Corby, carries all genes necessary for a type-IV conjugation system, an integrase gene and a putative oriT site. The second aim of this thesis was to investigate the implication of this genomic island in conjugative DNA transfer. Using conjugation assays we showed that the oriT site located on Trb-1 is functional and contributes to conjugation between different L. pneumophila strains. As this is the first oriT site of L. pneumophila known to be functional our results provide evidence that conjugation is a major mechanism for the evolution of new pathotypes in L. pneumophila.
Traumatic brain injury (TBI) is a result of an outside force causing immediate mechanical disruption of brain tissue and delayed pathogenic events. In order to examine injury processes associated with TBI, a number of rodent models to induce brain trauma have been described. However, none of these models covers the entire spectrum of events that might occur in TBI. Here we provide a thorough methodological description of a straightforward closed head weight drop mouse model to assess brain injuries close to the clinical conditions of human TBI.
Despite its precise agreement with the experiment, the validity of the standard model (SM) of elementary particle physics is ensured only up to a scale of several hundred GeV so far. Even more, the inclusion of gravity into an unifying theory poses a problem which cannot be solved by ordinary quantum field theory (QFT). String theory, which is the most popular ansatz for a unified theory, predicts QFT on noncommutative space-time as a low energy limit. Nevertheless, independently of the motivation given by string theory, the nonlocality inherent to noncommutative QFT opens up the possibility for the inclusion of gravity. There are no theoretical predictions for the energy scale Lambda_NC at which noncommutative effects arise and it can be assumed to lie in the TeV range, which is the energy range probed by the next generation of colliders. Within this work we study the phenomenological consequences of a possible realization of QFT on noncommutative space-time relying on this assumption. The motivation for this thesis was given by the gap in the range of phenomenological studies of noncommutative effects in collider experiments, due to the absence in the literature of Large Hadron Collider (LHC) studies regarding noncommutative QFTs. In the first part we thus performed a phenomenological analysis of the hadronic process pp -> Z gamma -> l^+l^- gamma at the LHC and of electron-positron pair annihilation into a Z boson and a photon at the International Linear Collider (ILC). The noncommutative extension of the SM considered within this work relies on two building blocks: the Moyal-Weyl star-product of functions on ordinary space-time and the Seiberg-Witten maps. The latter relate the ordinary fields and parameters to their noncommutative counterparts such that ordinary gauge transformations induce noncommutative gauge transformations. This requirement is expressed by a set of inhomogeneous differential equations (the gauge equivalence equations) which are solved by the Seiberg-Witten maps order by order in the noncommutative parameter Theta. Thus, by means of the Moyal-Weyl star-product and the Seiberg-Witten maps a noncommutative extension of the SM as an effective theory as expansion in powers of Theta can be achieved, providing the framework of our phenomenological studies. A consequence of the noncommutativity of space-time is the violation of rotational invariance with respect to the beam axis. This effect shows up in the azimuthal dependence of cross sections, which is absent in the SM as well as in other models beyond the SM. Thus, the azimuthal dependence of the cross section is a typical signature of noncommutativity and can be used in order to discriminate it against other new physics effects. We have found this dependence to be best suited for deriving the sensitivity bounds on the noncommutative scale Lambda_NC. By studying pp -> Z gamma -> l^+l^- gamma to first order in the noncommutative parameter Theta, we show in the first part of this work that measurements at the LHC are sensitive to noncommutative effects only in certain cases, giving bounds on the noncommutative scale of Lambda_NC > 1.2 TeV. Our result improved the bounds present in the literature coming from past and present collider experiments by one order of magnitude. In order to explore the whole parameter range of the noncommutativity, ILC studies are required. By means of e^+e^- -> Z gamma -> l^+l^- gamma to first order in Theta we have shown that ILC measurements are complementary to LHC measurements of the noncommutative parameters. In addition, the bounds on Lambda_NC derived from the ILC are significantly higher and reach Lambda_NC > 6 TeV. The second part of this work arose from the necessity to enlarge the range of validity of our model towards higher energies. Thus, we expand the neutral current sector of the noncommutative SM to second order in $\theta$. We found that, against the general expectation, the theory must be enlarged by additional parameters. The new parameters enter the theory as ambiguities of the Seiberg-Witten maps. The latter are not uniquely determined and differ by homogeneous solutions of the gauge equivalence equations. The expectation was that the ambiguities correspond to field redefinitions and therefore should vanish in scattering matrix elements. However, we proved that this is not the case, and the ambiguities do affect physical observables. Our conjecture is, that every order in Theta will introduce new parameters to the theory. However, only the experiment can decide to what extent efforts with still higher orders in Theta are reasonable and will also give directions for the development of theoretical models of noncommutative QFTs.
Dieser Arbeit liegen prospektive Daten von 107 allergisch erkrankten Patienten im Zeitraum von Dezember 1998 bis Mai 2000 zugrunde. Das Ziel der Arbeit bestand darin, eine Allergie mit einem nichtinvasiven Verfahren nachzuweisen. Untersucht wurden Speichelproben von bereits bekannten Allergikern sowie einer Kontrollgruppe ohne Allergie. Ausgewählt wurden Patienten mit den am häufigsten auftretenden Allergien (Derm. farinae, Derm. pteronyssinus, Gräser- und Roggenpollen). Bei allen Patienten wurde das entsprechende allergenspezifische IgE im Serum und Speichel bestimmt. Bei den ganzjährigen Allergien (Milben) fand sich bei 44 von 70 Patienten ein positiver Nachweis von spezifischem IgE im Speichel, im Vergleich zu 2 von 14 bei den Nichtallergikern. Für die saisonal auftretenden Allergien waren die Ergebnisse ähnlich. Bei 52 von 84 der Pollenallergiepatienten gegenüber 0 von 10 Patienten der Nicht-allergikergruppe gelang der Nachweis von spezifischen Speichel-IgE. Bei einer im Serum nachgewiesenen stärker ausgeprägten Form der Erkrankung wurde eine höhere Rate an Positivergebnissen auch im Speichel gemessen.
Circa 1% der Weltbevölkerung ist an schizophrenen Psychosen erkrankt. Durch Störung kognitiver und exekutiver Funktionen bedürfen diese Patienten regelmäßiger Untersuchung und Betreuung, was nicht nur für den einzelnen Betroffenen, sondern auch sozioökonomisch bedeutsam ist. Die Einteilung der endogenen Psychosen nach Karl Leonhard stellt eine hoch differenzierte, nosologisch orientierte Krankheitsklassifikation dar, die sich durch eine exakte Darstellung der diagnostischen Kriterien und durch eine Vielzahl von präzise voneinander abgegrenzten Krankheitsbildern mit spezifischer Verlaufscharakteristik auszeichnet. Der in dieser Arbeit vertretene Ansatz geht davon aus, dass es sich bei den schizophrenen Psychosen nicht um eine einzelne Erkrankung, sondern um verschiedene Krankheitsentitäten handelt, die wiederum unterschiedlichen pathogenentischen Prinzipien unterliegen. Ziel war es darzustellen, dass sich die zykloiden Psychosen mit immer wiederkehrenden Manifestationen im Vergleich zu den unsystematischen Schizophrenien mit überwiegend hereditärer Genese und im Vergleich zu den monomorph und monophasisch ablaufenden systematischen Schizophrenien hinsichtlich der Immunparameter deutlich unterschieden. Methode: Um eine mögliche Immunpathogenese bestimmter Formen endogener Psychosen belegen zu können, wurden in einer retrospektiven Untersuchung 61 Patienten aus dem schizophrenen Formenkreis nach Karl Leonhard (32 zykloide Psychosen, 21 unsystematische und 12 systematische Schizophrenien) gegenübergestellt und hinsichtlich ausgewählter Immunparameter aus Serum und Liquor, klinischer Verlaufsparameter und soziodemographischer Variablen untersucht. Ergebnisse: Die Analyse immunologischer Parameter aus Serum und Liquor erbrachte keine signifikanten Unterschiede zwischen den einzelnen Erkrankungsgruppen. Ebenso wurden bei der Verteilung auf beide Geschlechter, bei der Anzahl von Allergikern und bei der Anzahl der Patienten mit Gefäßrisikofaktoren keine signifikanten Unterschiede zwischen den Erkrankungsgruppen nach der Leonhard-Klassifikation ermittelt. Auch die Untersuchung peripherer Parameter und Serum- Liquorparametern bei Patienten mit Erstdiagnose ergab keine signifikanten Unterschiede. Im Rahmen einzelner klinischer Verlaufsparameter unterschieden sich jedoch die zykloiden Psychosen signifikant von den schizophrenen Psychosen. Konklusion: In einer Folgestudie könnte die Analyse speziellerer Immunparameter, wie beispielsweise Zytokine, wichtige Hinweise erbringen, um die zykloiden Psychosen auch auf paraklinischem Wege von chronisch schizophrenen Psychosen zu differenzieren und um neue, auf mögliche immunologische Prozesse abgestimmte Behandlungsalternativen prüfen zu können.
Arrhythmogene Kardiomyopathie (ACM) ist eine genetische Herzerkrankung, die durch Herzinsuffizienz, ventrikuläre Arrhythmien und plötzlichen Herztod gekennzeichnet ist. Mutationen in desmosomalen Proteinen der Zelladhäsion, wie Plakophilin 2 (PKP2) und Plakoglobin (PG), sind die häufigste Ursache der familiären ACM. Wie gestörte Zelladhäsion zum ACM-Phänotyp führt, ist jedoch nur teilweise geklärt. Potentielle Mechanismen sind eine gestörte Kalzium-(Ca2+)-Homöostase, mitochondrialer oxidativer Stress und metabolische Störungen. Ziel dieser Studie ist es, die mitochondriale Energetik und die Ca2+ -Homöostase in kardio-restriktiven PKP2-Knockout-Mäusen (KO) im Alter von 4, 8 und 12 Wochen sowie in PG-Knockout- Mäusen im Alter von 6 Wochen zu untersuchen. Vier Wochen alte PKP2-KO-Mäuse zeigten frühe Anzeichen von ACM, während alle anderen Altersgruppen typische Kennzeichen von ACM rekapitulierten. Kontraktilität, die damit verbundenen Ca2+ - Transienten, der Redoxstatus und das mitochondriale Membranpotenzial (ΔΨm) isolierter Kardiomyozyten wurden mit einem IonOptix-System bei elektrischer und β- adrenerger Stimulation untersucht. Alle desmosomalen KO-Kardiomyozyten zeigten eine verringerte diastolische Sarkomerlänge, was auf eine diastolische Dysfunktion hinwies. In allen PKP2 KO Kardiomyozyten lag außerdem ein erhöhter intrazellulärer Ca2+ -Spiegel vor, während in den PG KO-Kardiomyozyten das intrazellulärer Ca2+ unverändert war. PKP2 KO- und PG KO-Kardiomyozyten wiesen keine Ca2+ - Sensibilisierung der Myofilamente auf. Zur weiteren Bewertung der mitochondrialen Funktion wurde eine hochauflösende Respirometrie in isolierten Herzmitochondrien bei gleichzeitiger Überwachung von ΔΨm in PKP2 KO und PG KO Mäusen durchgeführt, welche in allen Versuchs- und Kontrollgruppen vergleichbar war. Im Verlauf der Versuche blieb der Redoxstatus stabil und es konnte kein Exzess reaktiver Sauerstoffspezies (ROS) festgestellt werden. Daraus konnte gefolgert werden, dass weder PKP2 KO noch PG KO-Mäuse eine beeinträchtigte mitochondriale Atmung aufwiesen. Diese Studie zeigt, dass isolierte PKP2 KO- oder PG KO-Kardiomyozyten EC-Kopplungsdefekte ohne mitochondriale Dysfunktion aufwiesen. Eine mitochondriale Dysfunktion konnte als treibender Faktor für die Progression des ACM- Phänotyps in den vorgestellten Mausmodellen ausgeschlossen werden. Weitere Studien sind erforderlich, um die mitochondriale Funktion im Zusammenhang mit ACM zu entschlüsseln.
Alien limb phenomenon is a rare syndrome associated with a feeling of non-belonging and disowning toward one's limb. In contrast, anarchic limb phenomenon leads to involuntary but goal-directed movements. Alien/anarchic limb phenomena are frequent in corticobasal syndrome (CBS), an atypical parkinsonian syndrome characterized by rigidity, akinesia, dystonia, cortical sensory deficit, and apraxia. The structure function relationship of alien/anarchic limb was investigated in multi centric structural magnetic resonance imaging (MRI) data. Whole-group and single subject comparisons were made in 25 CBS and eight CBS-alien/anarchic limb patients versus controls. Support vector machine was used to see if CBS with and without alien/anarchic limb could be distinguished by structural MRI patterns. Whole-group comparison of CBS versus controls revealed asymmetric frontotemporal atrophy. CBS with alien/anarchic limb syndrome versus controls showed frontoparietal atrophy including the supplementary motor area contralateral to the side of the affected limb. Exploratory analysis identified frontotemporal regions encompassing the pre-/and postcentral gyrus as compromised in CBS with alien limb syndrome. Classification of CBS patients yielded accuracies of 79%. CBS-alien/anarchic limb syndrome was differentiated from CBS patients with an accuracy of 81%. Predictive differences were found in the cingulate gyrus spreading to frontomedian cortex, postcentral gyrus, and temporoparietoocipital regions. We present the first MRI-based group analysis on CBS-alien/anarchic limb. Results pave the way for individual clinical syndrome prediction and allow understanding the underlying neurocognitive architecture. (C) 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Species' functional traits set the blueprint for pair-wise interactions in ecological networks. Yet, it is unknown to what extent the functional diversity of plant and animal communities controls network assembly along environmental gradients in real-world ecosystems. Here we address this question with a unique dataset of mutualistic bird-fruit, bird-flower and insect-flower interaction networks and associated functional traits of 200 plant and 282 animal species sampled along broad climate and land-use gradients on Mt. Kilimanjaro. We show that plant functional diversity is mainly limited by precipitation, while animal functional diversity is primarily limited by temperature. Furthermore, shifts in plant and animal functional diversity along the elevational gradient control the niche breadth and partitioning of the respective other trophic level. These findings reveal that climatic constraints on the functional diversity of either plants or animals determine the relative importance of bottom-up and top-down control in plant-animal interaction networks.
Background: Gene function analysis of the obligate intracellular bacterium Chlamydia pneumoniae is hampered by the facts that this organism is inaccessible to genetic manipulations and not cultivable outside the host. The genomes of several strains have been sequenced; however, very little information is available on the gene structure and transcriptome of C. pneumoniae. Results: Using a differential RNA-sequencing approach with specific enrichment of primary transcripts, we defined the transcriptome of purified elementary bodies and reticulate bodies of C. pneumoniae strain CWL-029; 565 transcriptional start sites of annotated genes and novel transcripts were mapped. Analysis of adjacent genes for cotranscription revealed 246 polycistronic transcripts. In total, a distinct transcription start site or an affiliation to an operon could be assigned to 862 out of 1,074 annotated protein coding genes. Semi-quantitative analysis of mapped cDNA reads revealed significant differences for 288 genes in the RNA levels of genes isolated from elementary bodies and reticulate bodies. We have identified and in part confirmed 75 novel putative non-coding RNAs. The detailed map of transcription start sites at single nucleotide resolution allowed for the first time a comprehensive and saturating analysis of promoter consensus sequences in Chlamydia. Conclusions: The precise transcriptional landscape as a complement to the genome sequence will provide new insights into the organization, control and function of genes. Novel non-coding RNAs and identified common promoter motifs will help to understand gene regulation of this important human pathogen.