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Institute
- Graduate School of Life Sciences (989) (remove)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (5)
- Universitätsklinikum Münster (3)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
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- CBIO, University of Cape Town, South Africa (1)
- Carl-Ludwig-Institut für Physiologie, Universität Leipzig (1)
- Chair of Experimental Biomedicine I (1)
Background: There is extensive evidence that explicit memory, which involves conscious recall of encoded information, can be modulated by emotions; emotions may influence encoding, consolidation or retrieval of information. However, less is known about the modulatory effects of emotions on procedural processes like motor memory, which do not depend upon conscious recall and are instead demonstrated through changes in behaviour. Experiment 1: The goal of the first experiment was to examine the influence of emotions on motor learning. Four groups of subjects completed a motor learning task performing brisk isometric abductions with their thumb. While performing the motor task, the subjects heard emotional sounds varying in arousal and valence: (1) valence negative / arousal low (V-/A-), (2) valence negative / arousal high (V-/A+), (3) valence positive / arousal low (V+/A-), and (4) valence positive / arousal high (V+/A+). Descriptive analysis of the complete data set showed best performances for motor learning in the V-/A- condition, but the differences between the conditions did not reach significance. Results suggest that the interaction between valence and arousal may modulate motor encoding processes. Since limitations of the study cannot be ruled out, future studies with different emotional stimuli have to test the assumption that exposure to low arousing negative stimuli during encoding has a facilitating effect on short term motor memory. Experiment 2: The purpose of the second experiment was to investigate the effects of emotional interference on consolidation of sequential learning. In different sessions, 6 groups of subjects were initially trained on a serial reaction time task (SRTT). To modulate consolidation of the newly learned skill, subjects were exposed, after the training, to 1 of 3 (positive, negative or neutral) different classes of emotional stimuli which consisted of a set of emotional pictures combined with congruent emotional musical pieces or neutral sound. Emotional intervention for each subject group was done in 2 different time intervals (either directly after the training session, or 6 h later). After a 72 h post-training interval, each group was retested on the SRTT. Re-test performance was evaluated in terms of response times and accuracy during performance of the target sequence. Emotional intervention did not influence either response times or accuracy of re-testing SRTT task performance. However, explicit awareness of sequence knowledge was enhanced by arousing negative stimuli applied at 0 h after training. These findings suggest that consolidation of explicit aspects of procedural learning may be more responsive toward emotional interference than are implicit aspects. Consolidation of different domains of skill acquisition may be governed by different mechanisms. Since skill performance did not correlate with explicit awareness we suggest that implicit and explicit modes of SRTT performance are not complementary. Experiment 3: The aim of the third experiment was to analyze if the left hemisphere preferentially controls flexion responses towards positive stimuli, while the right hemisphere is specialized towards extensor responses to negative pictures. To this end, right-handed subjects had to pull or push a joystick subsequent to seeing a positive or a negative stimulus in their left or right hemifield. Flexion responses were faster for positive stimuli, while negative stimuli were associated with faster extensions responses. Overall, performance was fastest when emotional stimuli were presented to the left visual hemifield. This right hemisphere superiority was especially clear for negative stimuli, while reaction times towards positive pictures showed no hemispheric difference. We did not find any interaction between hemifield and response type. Neither was there a triple interaction between valence, hemifield and response type. In our experimental context the interaction between valence and hemifield seems to be stronger than the interaction between valence and motor behaviour. From these results we suppose that under certain conditions a hierarchy scaling of the asymmetry patterns prevails, which might mask any other existing asymmetries.
Die Phosphoglykolat-Phosphatase PGP (früher auch als AUM bezeichnet) wurde in unserem Labor als Mitglied der HAD-Typ-Phosphatasen identifiziert. Die genetische Inaktivierung des Enzyms im gesamten Mausorganismus führt ab E8.5 zu einer Wachstumsverzögerung muriner Embryonen und bis E12.5 schließlich zu deren Tod. Im Gegensatz dazu sind Mäuse mit einer PGP-Inaktivierung in hämatopoetischen Zellen und im Endothel lebensfähig und phänotypisch unauffällig. Neue Erkenntnisse schreiben dem Enzym neben einer Aktivität gegenüber Phosphoglykolat auch Aktivitäten gegenüber Glycerin-3-phosphat (G3P), P-Erythronat und P-Lactat zu. Da diese Phosphatase-Aktivitäten Auswirkungen auf den Lipidstoffwechsel nahelegen, wurde in der vorliegenden Arbeit mittels massenspektrometrischer Methoden der Einfluss der Phosphoglykolat-Phosphatase auf den Metabolismus von Signal-, Membran- und Speicherlipiden in murinen Embryonen und Lymphozyten untersucht.
Nach Inaktivierung der PGP im gesamten Organismus wurden in E8.5-Embryonen erhöhte Diacylglycerin (DG)-, Triacylglycerin (TG)- und Sphingomyelin (SM)-Spiegel gemessen, während niedrigere Phosphatidylcholin (PC)-Level vorlagen.
In PGP-inaktivierten Lymphozyten waren G3P-, DG-, TG-, PC- und SM-Level nicht verändert. Dafür kam es zu signifikanten Erhöhungen der Phosphatidylglycerol (PG*)- und Cardiolipin (CL)-Spiegel.
Zusammenfassend konnte gezeigt werden, dass die PGP in unterschiedlichen Geweben differenzielle Effekte auf die Spiegel verschiedener Lipide hat. Dies deckt neue Funktionen der PGP für die Regulation des Lipidmetabolismus auf. Die vorliegende Arbeit stellt somit die Grundlage für weitere Untersuchungen über die genauen Ursachen und Folgen dieser Regulation dar und lässt auf eine wichtige Rolle der PGP als metabolische Phosphatase im Organismus schließen.
Das Multiple Myelom muss trotz stetiger Fortschritte im Hinblick auf die verfügbaren Therapieoptionen und die Krankheitsprognose weiterhin im Wesentlichen als eine unheilbare Erkrankung angesehen werden. Dies kann vor allem auf die große inter- und intraindividuelle Heterogenität des MM zurückgeführt werden, welche die Entwicklung gezielter molekularer Therapiestrategien erheblich erschwert. Hierbei stellen loss-of-function- Experimente, welche die Identifikation einzelner oder mehrerer potenziell therapeutisch relevanter Zielstrukturen durch die (kombinierte) Depletion von Proteinen ermöglichen, eine wichtige Säule dar, für deren Durchführung verschiedene Systeme mit jeweils eigenen Vor- und Nachteilen zur Verfügung stehen. Im Rahmen dieser Arbeit konnte die Etablierung eines auf RNA-Interferenz basierenden stabilen und induzierbaren Knockdownsystems durch Elektroporation von MM Zelllinien mit Einzel- und Mehrfach-shRNA-Vektoren abgeschlossen werden. Die Transfektion von tet-Repressor-exprimierenden Zellinien mit einer oder mehreren shRNAExpressionskassetten innerhalb eines Plasmidvektors ermöglicht durch die vollständige Repression der shRNA-Transkription im nicht-induzierten Zustand die Selektion erfolgreich transponierter Zellen ohne Effekt-vermittelte Bias und die Generierung großer Zellmengen für Versuchsreihen in vergleichsweise kurzer Zeit. Die Induktion der verschiedenen in dieser Arbeit evaluierten Einzel- und Mehrfach-shRNA-Konstrukte gegen (Kombinationen von) Zielstrukturen im Ras/MAPK- sowie im NFκB-Signalsystem mittels Doxyzyklin als Induktionsagens zeigte durchweg deutliche und den Erwartungen aus transienten Experimenten entsprechende Knockdownergebnisse. Auch die Resultate hinsichtlich funktioneller Readouts und zellphysiologischer Effekte der induzierten Knockouts stehen im Einklang mit vorangegangenen Experimenten und bestätigen somit die Äquivalenz des stabilen induzierbaren Systems zu transienten Ansätzen auf RNAi-Basis oder zu pharmakologischen Inhibitoren. Der hierbei erzielte hypomorphe Phänotyp innerhalb einer polyklonalen Zellpopulation bildet die Realität einer medikamentösen Blockade einer oder weniger Zielstrukturen einer heterogenen MM Tumorpopulation näherungsweise ab, weshalb das vorgestellte System ein hilfreiches, kosteneffizientes und leicht zu handhabendes Werkzeug für die Identifikation potenziell relevanter Zielstrukturen für molekulare Therapieansätze im Multiplen Myelom darstellt
Bacterial mastitis is caused by invasion of the udder, bacterial multiplication and induction of
inflammatory responses in the bovine mammary gland. Disease severity and the cause of disease are
influenced by environmental factors, the cow’s immune response as well as bacterial traits. Escherichia coli (E. coli) is one of the main causes of acute bovine mastitis, but although pathogenic E. coli strains can be classified into different pathotypes, E. coli causing mastitis cannot unambiguously be distinguished from commensal E. coli nor has a common set of virulence factors
been described for mastitis isolates. This project focussed on the characterization of virulence-
associated traits of E. coli mastitis isolates in comprehensive analyses under conditions either
mimicking initial pathogenesis or conditions that E. coli mastitis isolates should encounter while entering the udder. Virulence-associated traits as well as fitness traits of selected bovine mastitis or faecal E. coli strains were identified and analyzed in comparative phenotypic assays. Raw milk whey was introduced to
test bacterial fitness in native mammary secretion known to confer antimicrobial effects.
Accordingly, E. coli isolates from bovine faeces represented a heterogeneous group of which some
isolates showed reduced ability to survive in milk whey whereas others phenotypically resembled
mastitis isolates that represented a homogeneous group in that they showed similar survival and
growth characteristics in milk whey. In contrast, mastitis isolates did not exhibit such a uniform phenotype when challenged with iron shortage, lactose as sole carbon source and lingual
antimicrobial peptide (LAP) as a main defensin of milk. Reduced bacterial fitness could be related to LAP suggesting that bacterial adaptation to an intramammary lifestyle requires resistance to host
defensins present in mammary secretions, at least LAP.
E. coli strain 1303 and ECC-1470 lack particular virulence genes associated to mastitis isolates. To find out whether differences in gene expression may contribute to the ability of E. coli variants to cause mastitis, the transcriptome of E. coli model mastitis isolates 1303 and ECC-1470 were analyzed to
identify candidate genes involved in bacterium-host interaction, fitness or even pathogenicity during bovine mastitis.
DNA microarray analysis was employed to assess the transcriptional response of E. coli 1303 and
ECC-1470 upon cocultivation with MAC-T immortalized bovine mammary gland epithelial cells to
identify candidate genes involved in bacterium-host interaction. Additionally, the cell adhesion and invasion ability of E. coli strain 1303 and ECC-1470 was investigated. The transcriptonal response to the presence of host cells rather suggested competition for nutrients and oxygen between E. coli and MAC-T cells than marked signs of adhesion and invasion. Accordingly, mostly fitness traits that may also contribute to efficient colonization of the E. coli primary habitat, the gut, have been utilized by the mastitis isolates under these conditions. In this study, RNA-Seq was employed to assess the bacterial transcriptional response to milk whey.
According to our transcriptome data, the lack of positively deregulated and also of true virulence-associated determinants in both of the mastitis isolates indicated that E. coli might have adapted by other means to the udder (or at least mammary secretion) as an inflammatory site. We identified traits that promote bacterial growth and survival in milk whey. The ability to utilize citrate promotes fitness and survival of E. coli that are thriving in mammary secretions. According to our results, lactoferrin has only weak impact on E. coli in mammary secretions. At the same time bacterial determinants involved in iron assimilation were negatively regulated, suggesting that, at least during the first hours, iron assimilation is not a challenge to E. coli colonizing the mammary gland. It has been hypothesized that cellular iron stores cause temporary independency to extracellular accessible iron. According to our transcriptome data, this hypothesis was supported and places iron uptake
systems beyond the speculative importance that has been suggested before, at least during early
phases of infection. It has also been shown that the ability to resist extracytoplasmic stress, by oxidative conditions as well as host defensins, is of substantial importance for bacterial survival in mammary secretions.
In summary, the presented thesis addresses important aspects of host-pathogen interaction and
bacterial conversion to hostile conditions during colonization of the mastitis inflammatory site, the mammary gland.
Although the field of fungal infections advanced tremendously, diagnosis of invasive pulmonary aspergillosis (IPA) in immunocompromised patients continues to be a challenge. Since IPA is a multifactorial disease, investigation from different aspects may provide new insights, helpful for improving IPA diagnosis. This work aimed to characterize the human immune response to Aspergillus fumigatus in a multilevel manner to identify characteristic molecular candidates and risk factors indicating IPA, which may in the future support already established diagnostic assays. We combined in vitro studies using myeloid cells infected with A. fumigatus and longitudinal case-control studies investigating patients post allogeneic stem cell transplantation (alloSCT) suffering from IPA and their match controls.
Characteristic miRNA and mRNA signatures indicating A. fumigatus-infected monocyte-derived dendritic cells (moDCs) demonstrated the potential to differentiate between A. fumigatus and Escherichia coli infection. Transcriptome and protein profiling of alloSCT patients suffering from IPA and their matched controls revealed a distinctive IPA signature consisting of MMP1 induction and LGAL2 repression in combination with elevated IL-8 and caspase-3 levels. Both, in vitro and case-control studies, suggested cytokines, matrix-metallopeptidases and galectins are important in the immune response to A. fumigatus. Identified IPA characteristic molecular candidates are involved in numerous processes, thus a combination of these in a distinctive signature may increase the specificity. Finally, low monocyte counts, severe GvHD of the gut (grade ≥ 2) and etanercept administration were significantly associated with IPA diagnosis post alloSCT. Etanercept in monocyte-derived macrophages (MDM) infected with A. fumigatus downregulates genes involved in the NF-κB and TNF-α pathway and affects the secretion of CXCL10.
Taken together, identified characteristic molecular signatures and risk factors indicating IPA may in the future in combination with established fungal biomarkers overcome current diagnostic challenges and help to establish tailored antifungal therapy. Therefore, further multicentre studies are encouraged to evaluate reported findings.
Das invasive Potential maligner Gliome beeinflusst maßgeblich die schlechte Prognose dieser Tumorentität. Migration und Invasion von Tumorzellen werden entscheidend durch die Cofilin-vermittelte Umstrukturierung des Aktin-Zytoskeletts geprägt, die durch die Aktivität antagonistischer Cofilin-Kinasen und -Phosphatasen reguliert wird.
Im Rahmen der vorliegenden Arbeit konnte ein progressiver Expressionsverlust der Cofilin-Phosphatase Chronophin mit ansteigendem Malignitätsgrad astrozytärer Gliome aufgezeigt werden, der mit einer Zunahme der Phosphorylierung von Cofilin einhergeht. In den entsprechenden Gewebeproben gelang gleichzeitig der Nachweis einer gesteigerten Expression der Cofilin-Kinase LIMK-2.
Genetische und epigenetische Analysen des Chronophin-Locus konnten eine Hypermethylierung im Bereich der Promotorregion der Phosphatase identifizieren, die möglicherweise dem Verlust von Chronophin in Glioblastom-Gewebeproben zugrunde liegt.
In Glioblastom-Zelllinien, die unterschiedliche Expressionsmuster von Chronophin aufwiesen, konnten hingegen keine molekularen Alterationen festgestellt werden.
Untersuchungen des Einflusses von ROCK- und LIMK-Inhibitoren auf Glioblastomzellen konnten ausgeprägte Veränderungen der Zellmorphologie dokumentieren, wobei erstmals die Induktion eines stellate cell-Phänotyps unter Einfluss des LIMK-Inhibitors BMS-5 beschrieben wird. Während ROCK- und LIMK-Inhibitoren keinen Einfluss auf die 2D-Motilität der Tumorzellen hatten, wiesen die Glioblastomzellen in Abhängigkeit ihrer basalen Cofilin-Aktivität eine verstärkte bzw. verminderte 3D-Invasivität auf.
Die Erkenntnisse dieser Arbeit unterstreichen die Bedeutung des Cofilin-Signalweges für die Migration und Invasion von Gliomzellen, zeigen neue Angriffspunkte in der Therapie maligner Gliome auf und warnen zugleich vor einem unkritischen Einsatz neuer Wirkstoffe.
Die COVID-19 Pandemie ist die bisher verheerendste Pandemie des 21. Jahrhunderts. Durch die Einführung neuer mRNA-basierter Impfstoffe sowie der hohen Rate natürlicher Infektionen konnte die weltweite SARS-CoV-2-Immunität gesteigert werden. Trotz aller Erfolge zur Eindämmung der Pandemie kann eine Infektion auch heute noch zu schweren Verläufen und Tod führen. Eine adäquate COVID-19-Therapie ist folglich auf potente Virostatika angewiesen. Eine durch Umgehung zeitaufwändiger klinischer Studien schnell verfügbare Alternative zu neu entwickelten Arzneimitteln ist die Anwendung etablierter Medikamente. Wir isolierten und charakterisierten ein von einem Patienten stammendes SARS-CoV-2-Virus. Dieses Virusisolat wurde bisher in elf Publikationen verwendet. Mittels quantitativer Echtzeit-Polymerasekettenreaktion untersuchten wir eine Substanzbibliothek mit mehr als 300 neuen und bereits zugelassenen Wirkstoffen auf ihre Wirksamkeit gegen SARS-CoV-2. Dabei konnten wir zeigen, dass der selektive Serotonin-Wiederaufnahmehemmer Fluoxetin die SARS-CoV-2-Replikation ab einer Dosis von 0,8 μg/ml signifikant inhibiert, einer bei der Behandlung von Depressionen häufig angewandten Dosierung. Der EC50-Wert lag bei 387 ng/ml. Die Behandlung mit Fluoxetin resultierte in einer reduzierten Zahl an Virusprotein-produzierenden Zellen, was darauf hindeutet, dass es die virale Reinfektion und/oder Proteinexpression inhibiert. Fluoxetin ist ein racemisches Gemisch, wobei das (S)-Enantiomer der potentere Serotonin-Wiederaufnahmehemmer ist. Wir konnten zeigen, dass beide Enantiomere einen vergleichbaren antiviralen Effekt gegen SARS-CoV-2 aufweisen, wodurch das (R)-Enantiomer bei virologischer Indikation gegebenenfalls präferiert werden sollte. Fluoxetin hat keinen Einfluss auf die Replikation des Tollwut-Virus und des Humanen Respiratorischen Synzytial-Virus, was auf eine Virusspezifität hindeutet. Weitere aus der Bibliothek stammende signifikante Inhibitoren der SARS-CoV-2-Replikation sind die am Institut für Organische Chemie Würzburg entwickelten Substanzen AKS 232 und AKS 128. Neben der medikamentösen Therapie ist die akkurate Bestimmung neutralisierender Antikörper gegen SARS-CoV-2 zur Quantifizierung des bestehenden (Re-) Infektionsschutzes sowie zur Planung zukünftiger Impfstrategien von großer Bedeutung. Im Rahmen dieser Arbeit entwickelten wir unter Verwendung der quantitativen Echtzeit-Polymerasekettenreaktion erfolgreich ein zuverlässiges Testverfahren zur Detektion neutralisierender anti-SARS-CoV-2 Antikörper.
Ischemia-reperfusion injury (I/R injury) is a common complication in ischemic stroke (IS) treatment, which is characterized by a paradoxical perpetuation of tissue damage despite the successful re-establishment of vascular perfusion. This phenomenon is known to be facilitated by the detrimental interplay of platelets and inflammatory cells at the vascular interface. However, the spatio-temporal and molecular mechanisms underlying these cellular interactions and their contribution to infarct progression are still incompletely understood. Therefore, this study intended to clarify the temporal mechanisms of infarct growth after cerebral vessel recanalization. The data presented here could show that infarct progression is driven by early blood-brain-barrier perturbation and is independent of secondary thrombus formation. Since previous studies unravelled the secretion of platelet granules as a molecular mechanism of how platelets contribute to I/R injury, special emphasis was placed on the role of platelet granule secretion in the process of barrier dysfunction. By combining an in vitro approach with a murine IS model, it could be shown that platelet α-granules exerted endothelial-damaging properties, whereas their absence (NBEAL2-deficiency) translated into improved microvascular integrity. Hence, targeting platelet α-granules might serve as a novel treatment option to reduce vascular integrity loss and diminish infarct growth despite recanalization.
Recent evidence revealed that pathomechanisms underlying I/R injury are already instrumental during large vessel occlusion. This indicates that penumbral tissue loss under occlusion and I/R injury during reperfusion share an intertwined relationship. In accordance with this notion, human observational data disclosed the presence of a neutrophil dominated immune response and local platelet activation and secretion, by the detection of the main components of platelet α-granules, within the secluded vasculature of IS patients. These initial observations of immune cells and platelets could be further expanded within this thesis by flow cytometric analysis of local ischemic blood samples. Phenotyping of immune cells disclosed a yet unknown shift in the lymphocyte population towards CD4+ T cells and additionally corroborated the concept of an immediate intravascular immune response that is dominated by granulocytes. Furthermore, this thesis provides first-time evidence for the increased appearance of platelet-leukocyte-aggregates within the secluded human vasculature. Thus, interfering with immune cells and/or platelets already under occlusion might serve as a potential strategy to diminish infarct expansion and ameliorate clinical outcome after IS.
Im Rahmen des interdisziplinären Promotionsschwerpunkts Resilienzfaktoren der Schmerzverarbeitung des evangelischen Studienwerks in Zusammenarbeit mit der Julius-Maximilians-Universität Würzburg und der Otto-Friedrich-Universität Bamberg untersuche ich in diesem Promotionsprojekt den Einfluss von Sicherheit auf die Schmerzverarbeitung. Es ist bekannt, dass die Schmerzverarbeitung durch Emotionen moduliert werden kann. Man geht davon aus, dass negative Emotionen den Schmerz in der Regel verstärken, während positive Emotionen zu einer Schmerzreduktion führen. Frühere Studien fanden heraus, dass die Erwartung eines aversiven Ereignisses zu Bedrohung und stärkeren Schmerzen führt. Es stellt sich die Frage, ob das Gegenteil von Bedrohung, nämlich Sicherheit, zu einer Verringerung der Schmerzen führen kann. Um diese Hypothese zu untersuchen, habe ich drei Experimente an gesunden ProbandInnen durchgeführt.
Anxiety disorders (AD) are common, disabling mental disorders, which constitute the most prevalent mental health condition conveying a high individual and socioeconomic burden. Social anxiety disorder (SAD), i.e. fear in social situations particularly when subjectively scrutinized by others, is the second most common anxiety disorder with a life time prevalence of 10%. Panic disorder (PD) has a life time prevalence of 2-5% and is characterized by recurrent and abrupt surges of intense fear and anticipatory anxiety, i.e. panic attacks, occurring suddenly and unexpected without an apparent cue.
In recent years, psychiatric research increasingly focused on epigenetic mechanisms such as DNA methylation as a possible solution for the problem of the so-called “hidden heritability”, which conceptualizes the fact that the genetic risk variants identified so far only explain a small part of the estimated heritability of mental disorders.
In the first part of this thesis, oxytocin receptor (OXTR) gene methylation was investigated regarding its role in the pathogenesis of social anxiety disorder. In summary, OXTR methylation patterns were implicated in different phenotypes of social anxiety disorder on a categorical, neuropsychological, neuroendocrinological as well as on a neural network level. The results point towards a multilevel role of OXTR gene hypomethylation particularly at one CpG site (CpG3, Chr3: 8 809 437) within the protein coding region of the gene in SAD.
The second part of the thesis investigated monoamine oxidase A (MAOA) gene methylation regarding its role in the pathogenesis of panic disorder as well as – applying a psychotherapy-epigenetic approach – its dynamic regulation during the course of cognitive behavioural therapy (CBT) in PD patients. First, MAOA hypomethylation was shown to be associated with panic disorder as well as with panic disorder severity. Second, in patients responding to treatment MAOA hypomethylation was shown to be reversible up to the level of methylation in healthy controls after the course of CBT. This increase in MAOA methylation along with successful psychotherapeutic treatment was furthermore shown to be associated with symptom improvement regarding agoraphobic avoidance in an independent replication sample of non-medicated patients with PD.
Taken together, in the future the presently identified epigenetic patterns might contribute to establishing targeted preventive interventions and personalized treatment options for social anxiety disorder or panic disorder, respectively.
For the differentiation of a embryonic stem cells (ESCs) to neuronal cells (NCs) a complex and coordinated gene regulation program is needed. One important control element for neuronal differentiation is the repressor element 1 silencing transcription factor (REST) complex, which represses neuronal gene expression in non-neuronal cells. Crucial effector proteins of the REST complex are small phosphatases such as the CTDSPs (C-terminal domain small phosphatases) that regulate polymerase II activity by dephosphorylating the C-terminal domain of the polymerase, thereby repressing target genes. The stepwise inactivation of REST, including the CTDSPs, leads to the induction of a neuron-specific gene program, which ultimately induces the formation of neurons. The spatio-temporal control of REST and its effector components is therefore a crucial step for neurogenesis.
In zebrafish it was shown that the REST-associated CTDSP2 is negatively regulated by the micro RNA (miR) -26b. Interestingly, the miR-26b is encoded in an intron of the primary transcript of CTDSP2. This gives the fundament of an intrinsic regulatory negative feedback loop, which is essential for the proceeding of neurogenesis. This feedback loop is active during neurogenesis, but inactive in non-neuronal cells. The reason for this is that the maturation of the precursor miR (pre-miR) to the mature miR-26 is arrested in non neuronal cells, but not in neurons. As only mature miRs are actively repressing genes, the regulation of miR-26 processing is an essential step in neurogenesis.
In this study, the molecular basis of miR-26 processing regulation in the context of neurogenesis was addressed. The mature miR is processed from two larger precursors: First the primary transcript is cleaved by the enzyme DROSHA in the nucleus to form the pre-miR. The pre-miR is exported from the nucleus and processed further through the enzyme DICER to yield the mature miR. The mature miR can regulate gene expression in association with the RNA-induced silencing complex (RISC).
Multiple different scenarios in which miR processing was regulated were proposed and experimentally tested. Microinjection studies using Xenopus leavis oocytes showed that slowdown or blockage of the nucleo-cytoplasmic transport are not the reason for delayed pre-miR-26 processing. Moreover, in vitro and in vivo miR-processing assays showed that maturation is most likely regulated through a in trans acting factor, which blocks processing in non neuronal cells.
Through RNA affinity chromatographic assays using zebrafish and murine lysates I was able to isolate and identify proteins that interact specifically with pre-miR-26 and could by this influence its biogenesis. Potential candidates are FMRP/FXR1/2, ZNF346 and Eral1, whose functional characterisation in the context of miR-biogenesis could now be addressed.
The second part of my thesis was executed in close colaboration with the laboratory of Prof. Albrecht Müller. The principal question was addressed how miR-26 influences neuronal gene expression and which genes are primarily affected. This research question could be addressed by using a cell culture model system, which mimics ex vivo the differentiation of ESCs to NCs via neuronal progenitor.
For the functional analysis of miR-26 knock out cell lines were generated by the CRISPR/Cas9 technology. miR-26 deficient ESC keep their pluripotent state and are able to develop NPC, but show major impairment in differentiating to NCs. Through RNA deep sequencing the miR-26 induced transcriptome differences could be analysed.
On the level of mRNAs it could be shown, that the expression of neuronal gene is downregulated in miR-26 deficient NCs. Interestingly, the deletion of miR-26 leads to selectively decreased levels of miRs, which on one hand regulate the REST complex and on the other hand are under transcriptional control by REST themself. This data and the discovery that induction of miR-26 leads to enrichment of other REST regulating miRs indicates that miR-26 initiates neurogenesis through stepwise inactivation of the REST complex.
Blumeria graminis, the obligate biotrophic grass powdery mildew, is a highly pathogenic fungus capable of inflicting foliar diseases and of causing severe yield losses. There is asexual and sexual propagation in the life cycle of B. graminis. In the epidemiological processes of this pathogen, both types of spores - asexual conidia and sexual ascospores – are crucial.
Conidia of B. graminis are demonstrated to perceive cuticular very-long-chain aldehydes as molecular signal substances notably promoting germination and differentiation of the infection structure (the appressorium) – the prepenetration processes – in a concentration- and chain-length-dependent manner. Conidial germination and appressorium formation are known to be dramatically impeded by the presence of free water on the host surface. However, sexually formed ascospores are reported to easily germinate immersed in water. There are abundant assays on conidial prepenetration processes. However, with respect to the stimulating effects of very-long-chain aldehydes and to the influence of the presence of free water, ascosporic prepenetration processes are still obscure.
In order to study the effects of very-long-chain aldehydes on the ascosporic prepenetration processes of wheat powdery mildew fungus B. graminis f. sp. tritici, Formvar®-based in vitro systems were applied to exclude the secondary host effects (such as host resistance) and to reproducibly provide homogeneous hydrophobic substratum surfaces. By the presence of even-numbered very-long-chain aldehydes (C22 - C30), the appressorium formation of the ascospores was notably triggered in a chain-length dependent manner. N-octacosanal (C28) was the most inducing aldehyde tested. Unlike conidia, ascospores could easily differentiate immersed in water and showed a more variable differentiation pattern even with a single germ tube differentiating an appressorium.
To evaluate the alternative management against barley powdery mildew fungus Blumeria graminis f. sp. hordei, the suppressing effects of UV-C irradiation on the developmental processes of conidia on artificial surfaces (in vitro) and on host leaf surfaces (in vivo) were assayed. In vitro and in vivo, a single dose of 100 J m-2 UV-C was adequate to decrease conidial germination to < 20 % and to reduce appressorium formation to values < 5 %. UV-C irradiation negatively affected colony pustule size and vegetative propagation. Under photoperiodic conditions of 2h light/16h dark, 6h dark/12h light or 6h dark/18h light, UV-C-treated conidia showed photoreactivation (photo-recovery). White light-mediated photoreactivation was most effective immediately after UV-C irradiation, suggesting that a prolonged phase of darkness after UV-C application increased the efficacy of management against B. graminis. UV-C irradiation increased transcript levels of three putative photolyase genes in B. graminis, indicating those were probably involved in photoreactivation processes. However, mere white light or blue light (wavelength peak, 475 nm) could not induce the up-regulation of these genes.
To determine whether visible light directly impacted the prepenetration and penetration processes of this powdery mildew pathogen, conidia of Blumeria graminis f. sp. hordei and Blumeria graminis f. sp. tritici were inoculated onto artificial surfaces and on host leaf surfaces. Samples were analyzed after incubation periods under light conditions (white light intensity and spectral quality). Increasing white light intensities directly impaired conidial prepenetration processes in vitro but not in vivo. Applying an agar layer under the wax membrane compensated for conidial water loss as a consequence of high white light irradiation. Light stimulated in vitro and in vivo the appressorium elongation of B. graminis in a wavelength-dependent manner. Red light was more effective to trigger the elongation of appressorium than blue light or green light assayed.
Taken together, the findings of this study demonstrate that 1) a host surface recognition principle based on cuticular very-long-chain aldehydes is a common feature of B. graminis f. sp. tritici ascospores and conidia; 2) the transcriptional changes of three putative photolyase genes in B. graminis are mediated in a UV-C-dependent manner; 3) light directly affected the (pre)penetration processes of B. graminis.
PTPN22 encodes the lymphoid tyrosine phosphatase Lyp that can dephosphorylate Lck, ZAP-70 and Fyn to attenuate TCR signaling. A single-nucleotide polymorphism (C1858T) causes a substitution from arginine (R) to tryptophan (W) at 620 residue (R620W). Lyp-620W has been confirmed as a susceptible allele in multiple autoimmune diseases, including type 1 diabetes (T1D). Several independent studies proposed that the disease-associated allele is a gain-of-function variant. However, a recent report found that in human cells and a knockin mouse containing the R620W homolog that Ptpn22 protein degradation is accelerated, indicating Lyp-620W is a loss-of-function variant. Whether Lyp R620W is a gain- or loss-of-function variant remains controversial. To resolve this issue, we generated two lines (P2 and P4) of nonobese diabetic (NOD) mice in which Ptpn22 can be inducibly silenced by RNAi. We found long term silencing of Ptpn22 increased spleen cellularity and regulatory T (Treg) cell numbers, replicating the effect of gene deletion reported in the knockout (KO) B6 mice. Notably, Ptpn22 silencing also increased the reactivity and apoptotic behavior of B lymphocytes, which is consistent with the reduced reactivity and apoptosis of human B cells carrying the alleged gain-of-function PTPN22 allele. Furthermore, loss of Ptpn22 protected P2 KD mice from spontaneous and Cyclophosphamide (CY) induced diabetes. Our data support the notion that Lyp-620W is a gain-of-function variant. Moreover, Lyp may be a valuable target for the treatment of autoimmune diseases.
Plant-derived natural products and their analogs continue to play an important role in the discovery of new drugs for the treatment of human diseases. Potentially promising representatives of secondary metabolites are the naphthylisoquinoline alkaloids, which show a broad range of activities against protozoan pathogens, such as plasmodia, leishmania, and trypanosoma. Due to the increasing resistance of those pathogens against current therapies, highly potent novel agents are still urgently needed. Thus, it is worthy to discover new naphthylisoquinoline alkaloids hopefully with pronounced bioactivities by isolation from plants or by synthesis. The naphthylisoquinoline alkaloids are biosynthetically related to another class of plant-derived products, the naphthoquinones, some of which have been recently found to display excellent anti-multiple myeloma activities without showing any cytotoxicities on normal blood cells. Multiple myeloma still remains incurable, although remissions may be induced with co-opted therapeutic treatments. Therefore, more potent naphthoquinones are urgently required, and can be obtained by isolation from plants or by synthesis. In detail, the results in this thesis are listed as follows: 1) Isolation and characterization of naphthylisoquinoline alkaloids from the stems of a Chinese Ancistrocladus tectorius species. Nine new naphthylisoquinoline alkaloids, named ancistectorine A1 (60), N-methylancistectorine A1 (61), ancistectorine A2 (62a), 5-epi-ancistectorine A2 (62b), 4'-O-demethylancistectorine A2 (63), ancistectorine A3 (64), ancistectorine B1 (65), ancistectorine C1 (66), and 5-epi-ancistrolikokine D (67) were isolated from the Chinese A. tectorius and fully characterized by chemical, spectroscopic, and chiroptical methods. Furthermore, the in vitro anti-infectious activities of 60-62 and 63-66 have been tested. Three of the metabolites, 61, 62a, and 62b, exhibited strong antiplasmodial activities against the strain K1 of P. falciparum without showing significant cytotoxicities. With IC50 values of 0.08, 0.07, and 0.03 μM, respectively, they were 37 times more active than the standard chloroquine (IC50 = 0.26 μM). Moreover, these three compounds displayed high antiplasmodial selectivity indexes ranging from 100 to 3300. According to the TDR/WHO guidelines, they could be considered as lead compounds. In addition, seven alkaloids, 69-74 (structures not shown here), were isolated from A. tectorius that were known, but new to the plant, together with another fourteen known compounds (of these, only the structures of the three main alkaloids, 5a, 5b, and 78 are shown here), which had been previously found in the plant. The three metabolites ancistrocladine (5a), hamatine (5b), and (+)-ancistrocline (78) were found to show no or moderate activities against the MM cell lines. 2) Isolation and characterization of naphthylisoquinoline alkaloids from the root bark of a new, botanically yet undescribed Congolese Ancistrocladus species. An unprecedented dimeric Dioncophyllaceae-type naphthylisoquinoline alkaloid, jozimine A2 (84), as first recognized by G. Bauckmann from an as yet undescribed Ancistrocladus species, was purified and characterized as part of this thesis. Its full structural assignment was achieved by spectroscopic and chiroptical methods, and further confirmed by an X-ray diffraction analysis, which had never succeeded for any other dimeric naphthylisoquinoline alkaloids before. Structurally, the dimer is composed of two identical 4'-O-demethyldioncophylline A halves, coupled through a sterically hindered central axis at C-3',3'' of the two naphthalene moieties. Pharmacologically, jozimine A2 (84) showed an extraordinary antiplasmodial activity (IC50 = 1.4 nM) against the strain NF54 of P. falciparum. Beside jozimine A2 (85), another new alkaloid, 6-O-demethylancistrobrevine C (84), and four known ones, ancistrocladine (5a), hamatine (5b), ancistrobrevine C (86), and dioncophylline A (6) were isolated from the Ancistrocladus species, the latter in a large quantity (~500 mg), showing that the plant produces Ancistrocladaceae-type, mixed-Ancistrocladaceae/Dioncophyllaceae-type, and Dioncophyllaceae-type naphthyl- isoquinoline alkaloids. Remarkably, it is one of the very few plants, like A. abbreviatus, and A. barteri, that simultaneously contain typical representatives of all the above three classes of alkaloids. 3) Semi-synthesis of jozimine A2 (85), 3'-epi-85, jozimine A3 (93) and other alkaloids from dioncophylline A (6). The dimeric naphthylisoquinoline alkaloids, jozimine A2 (85) and 3'-epi-85, constitute rewarding synthetic targets for a comparative analysis of their antiplasmodial activities and for a further confirmation of the assigned absolute configurations of the isolated natural product of 85. They were semi-synthesized in a four-step reaction sequence from dioncophylline A (6) in cooperation with T. Büttner. The key step was a biomimetic phenol-oxidative dimerization at C-3' of the N,O-dibenzylated derivative of 89 by utilizing Pb(OAc)4. This is the first time that the synthesis of such an extremely sterically hindered (four ortho-substituents) naphthylisoquinoline alkaloid – with three consecutive biaryl axes! – has been successfully achieved. A novel dimeric naphthylisoquinoline, jozimine A3 (93), bearing a 6',6''-central biaryl axis, was semi-synthesized from 5'-O-demethyldioncophylline A (90) by a similar biomimetic phenol-oxidative coupling reaction as a key step, by employing Ag2O. HPLC analysis with synthetic reference material of 3'-epi-85 and 93 for co-elution revealed that these two alkaloids clearly are not present in the crude extract of the Ancistrocladus species from which jozimine A2 (85) was isolated. This evidences that jozimine A2 (85) is very specifically biosynthesized by the plant with a high regio- and stereoslectivity. Remarkably, the two synthetic novel dimeric naphthylisoquinoline alkaloids 3'-epi-85 and 93 were found to display very good antiplasmodial activities, albeit weaker than that of the natural and semi-synthetic product 85. Additionally, the two compounds 3'-epi-85 and 93 possessed high or moderate selectivity indexes, which were much lower than that of 85. However, they can still be considered as new lead structures. Two unprecedented oxidative products of dioncophylline A, the diastereomeric dioncotetralones A (94a) and B (94b), were synthesized from dioncophylline A (6) in a one-step reaction. Remarkably, the aromatic properties in the “naphthalene” and the “isoquinoline” rings of 94a and 94b are partially lost and the “biaryl” axis has become a C,C-double bond, so that the two halves are nearly co-planar to each other, which has never been found among any natural or synthetic naphthylisoquinoline alkaloid. Their full structural characterization was accomplished by spectroscopic methods and quantum-chemical CD calculations (done by Y. Hemberger). The presumed reaction mechanism was proposed in this thesis. In addition, one of the two compounds, 94a, exhibited a highly antiplasmodial activity (IC50 = 0.09 μM) with low cytotoxicity, and thus, can be considered as a new promising lead structure. Its 2'-epi-isomer, 94b, was inactive, evidencing a significant effect of chirality on the bioactivity. Of a number of naphthylisoquinoline alkaloids tested against the multiple-myeloma cell lines, the three compounds, dioncophylline A (6), 4'-O-demethyldioncophylline A (89), and 5'-O-demethyldioncophylline A (90) showed excellent activities, even much stronger than dioncoquinones B (10), C (102), the epoxide 175, or the standard drug melphalan. 4) Isolation and characterization of bioactive naphthoquinones from cell cultures of Triphyophyllum peltatum. Three new naphthoquinones, dioncoquinones C (102), D (103), and E (104), the known 8-hydroxydroserone (105), which is new to this plant, and one new naphthol dimer, triphoquinol A (107), were isolated from cell cultures of T. peltatum in cooperation with A. Irmer. Dioncoquinone C (102) showed an excellent activity against the MM cells, very similar to that of the previously found dioncoquinone B (10), without showing any inhibitory effect on normal cells. The other three naphthoquinones, 103105, were inactive or only weakly active. 5) Establishment of a new strategy for a synthetic access to dioncoquinones B (10) and C (102) on a large scale for in vivo experiments and for the synthesis of their analogs for first SAR studies. Before the synthesis of dioncoquinone B (10) described in this thesis, two synthetic pathways had previously been established in our group. The third approach described here involved the preparation of the joint synthetic intermediate 42 with the previous two routes. The tertiary benzamide 135 was ortho-deprotonated by using s-BuLi/TMEDA, followed by transmetallation with MgBr2▪2Et2O, and reaction with 2-methylallyl bromide (139). It resulted in the formation of ortho-allyl benzamide 140, which was cyclized by using methyl lithium to afford the naphthol 42. This strategy proved to be the best among the established three approaches with regard to its very low number of steps and high yields. By starting with 136, this third strategy yielded the related bioactive natural product, dioncoquinone C (102), which was accessed by total synthesis for the first time. To identify the pharmacophore of the antitumoral naphthoquinones, a library of dioncoquinone B (10) and C (102) analogs were synthesized for in vitro testing. Among the numerous naphthoquinones tested, the synthetic 7-O-demethyldioncoquinone C (or 7-O-hydroxyldioncoquinone B) (145), constitutes another promising basic structure to develop a new anti-MM agent. Furthermore, preliminary SAR results evidence that the three hydroxy functions at C-3, C-5, and C-6 are essential for the biological properties as exemplarily shown through the compounds 10, 102, and 145. All other mixed OH/OMe- or completely OMe-substituted structures were entirely inactive. By a serendipity the expoxide 175 was found to display the best anti-MM activity of all the tested isolated metabolites from T. peltatum, the synthesized naphthoquinones, and their synthetic intermediates. Toxic effects of 175 on normal cells were not observed, in contrast to the high toxicities of all other epoxides. Thus, the anti-MM activity of 175 is of high selectivity. The preliminary SAR studies revealed that the 6-OMe group in 175 is required, thus differed with the above described naphthoquinones (where 6-OH is a requisite in 10, 102, and 145), which evidenced potentially different modes of action for these two classes of compounds. 6) The first attempted total synthesis of the new naturally occurring triphoquinone (187a), which was recently isolated from the root cultures of T. peltatum in our group. A novel naphthoquinone-naphthalene dimer, 187a (structure shown in Chapter 10), was isolated in small quantities from the root cultures of T. peltatum. Thus, its total synthesis was attempted for obtaining sufficient amounts for selected biotestings. The key step was planned to prepare the extremely sterically hindered (four ortho-substituents) binaphthalene 188 by a coupling reaction between the two 2-methylnaphthalene derivatives. Test reactions involving a system of two simplified 2-methylnaphthylboron species and 2-methylnaphthyl bromide proved the Buchwald ligand as most promising. The optimized conditions were then applied to the two true - highly oxygenated - coupling substrates, between the 2-methylnaphthylboron derivatives 210, 211, 213, or 214 and the 2-methylnaphthyl iodides (or bromides) 215 (206), 215 (206), 212 (205), or 212 (205), respectively. Unfortunately, this crucial step failed although various bases and solvent systems were tested. This could be due to the high electron density of the two coupling substrates, both bearing strongly OMOM/OMe-donating function groups. Therefore, a more powerful catalyst system or an alternative synthetic strategy must be explored for the total synthesis of 187a. 7) Phytochemical investigation of the Streptomyces strain RV-15 derived from a marine sponge. Cyclodysidins A-D (216-219), four new cyclic lipopeptides with a- and ß-amino acids, were isolated from the Streptomyces strain RV15 derived from a marine sponge by Dr. U. Abdelmohsen. Their structures were established as cyclo-(ß-AFA-Ser-Gln-Asn-Tyr-Asn-Ser-Thr) by spectroscopic analysis using 2D NMR techniques and CID-MS/MS in the course of this thesis. In conclusion, the present work contributes to the discovery of novel antiplasmodial naphthylisoquinoline alkaloids and antitumoral naphthoquinones, which will pave the way for future studies on these two classes of compounds.
Single-molecule microscopy is one of the decisive methodologies that allows one to clarify cellular signaling in both spatial and temporal dimentions by tracking with nanometer precision the diffusion of individual microscopic particles coupled to relevant biological molecules. Trajectory analysis not only enables determination of the mechanisms that drive and constrain the particles motion but also to reveal crucial information about the molecule interaction, mobility, stoichiometry, all existing subpopulations and unique functions of particular molecules. Efficacy of this technique depends on two problematic issues the usage of the proper fluorophore and the type of biochemical attachment of the fluorophore to a biomolecule. The goal of this study was to evolve a highly specific labeling method suitable for single molecule tracking, internalization and trafficking studies that would attain a calculable 1:1 fluorophore-to-receptor stoichiometry. A covalent attachment of quantum dots to transmembrane receptors was successfully achieved with a techinque that amalgamates acyl carrier protein (ACP) system as a comparatively small linker and coenzyme A (CoA)-functionalized quantum dots. The necessity of optimization of the quantum dot usage for more precise calculation of the membrane protein stoichiometries in larger assemblies led to the further study in which methods maximizing the number of signals and the tracking times of diverse QD types were examined. Next, the optimized techniques were applied to analyze behavior of interleukin-5 β-common chain receptor (IL-5Rβc) receptors that are endogenously expressed at low level on living differentiated eosinophil-like HL-60 cells. Obtained data disclosed that perused receptors form stable and higher order oligomers. Additionally, the mobility analysis based on increased in number (>10%) uninterrupted 1000-step trajectories revealed two patterns of confined motion. Thereupon methods were developed that allow both, determination of stoichiometries of cell surface protein complexes and the acquisition of long trajectories for mobility analysis. Sequentially, the aforementioned methods were used to scrutinize on the mobility, internalization and recycling dynamics characterization of a G protein-coupled receptor (GPCRs), the parathyroid hormone receptor (PTHR1) and several bone morphogenetic proteins (BMPs), a member of the TGF-beta superfamily of receptors. These receptors are two important representatives of two varied membrane receptor classes. BMPs activate SMAD- and non-SMAD pathways and as members of the transforming growth factor β (TGF-β) superfamily are entailed in the regulation of proliferation, differentiation, chemotaxis, and apoptosis. For effective ligand induced and ligand independent signaling, two types of transmembrane serine/threonine kinases, BMP type I and type II receptors (BMPRI and BMPRII, respectively) are engaged. Apparently, the lateral mobility profiles of BMPRI and BMPRII receptors differ markedly, which determinate specificity of the signal. Non-SMAD signaling and subsequent osteoblastic differentiation of precursor cells particularly necessitate the confinement of the BMP type I receptor, resulting in the conclusion that receptor lateral mobility is a dominative mechanism to modulate SMAD versus non-SMAD signaling during differentiation. Confined motion was also predominantly observed in the studies devoted to, entailed in the regulation of calcium homeostasis and in bone remodeling, the parathyroid hormone receptor (PTHR1), in which stimulation with five peptide ligands, specific fragments of PTH: hPTH(1–34), hPTHrP(107–111)NH2; PTH(1–14); PTH(1–28) G1R19, bPTH(3–34), first four belonging to PTH agonist group and the last to the antagonist one, were tested in the wide concentration range on living COS-1 and AD293 cells. Next to the mobility, defining the internalization and recycling rates of the PTHR1 receptor maintained in this investigation one of the crucial questions. Internalization, in general, allows to diminish the magnitude of the receptor-mediated G protein signals (desensitization), receptor resensitization via recycling, degradation (down-regulation), and coupling to other signaling pathways (e.g. MAP kinases). Determinants of the internalization process are one of the most addressed in recent studies as key factors for clearer understanding of the process and linking it with biological responses evoked by the signal transduction. The internalization of the PTH-receptor complex occurs via the clathrin-coated pit pathway involving β-arrestin2 and is initiated through the agonist occupancy of the PTHR1 leading to activation of adenylyl cyclase (via Gs), and phosphatidylinositol-specific phospholipase Cβ (via Gq). Taken together, this work embodies complex study of the interleukin-5 β-common chain receptor (IL-5Rβc) receptors, bone morphogenetic proteins (BMPs) and the parathyroid hormone receptor with the application of single-molecule microscopy with the newly attained ACP-quantum dot labeling method and standard techniques.
Das Signal-zu-Rausch-Verhältnis (SNR) stellt bei modernen Bildgebungstechniken in der Magnetresonanz-Tomographie heutzutage oftmals die entscheidende Limitation dar. Eine Verbesserung durch Modifikation der Hardware ist kostspielig und führt meistens zu einer Verstärkung anderer Probleme, wie zum Beispiel erhöhte Energiedeposition ins Gewebe. Im Gegensatz dazu ist Dichtegewichtung eine Methode, die eine SNR-Erhöhung durch Modifikation der Aufnahmetechnik ermöglicht. In der MR-Bildgebung erfolgt oftmals eine retrospektive Filterung des aufgenommenen Signalverlaufs, beispielsweise zur Artefaktreduktion. Damit einhergehend findet eine Veränderung der Modulationstransferfunktion (MTF) bzw. ihrer Fouriertransformierten, der räumlichen Antwortfunktion (SRF), statt. Optimales SNR wird nach dem Matched Filter-Theorem erzielt, wenn die nachträgliche Filterung dem aufgenommenen Signalverlauf proportional ist. Dies steht dem Ziel der Artefaktreduktion entgegen. Bei Dichtegewichtung steht durch nicht-kartesische Abtastung des k-Raums mit der k-Raum-Dichte ein zusätzlicher Freiheitsgrad zur Verfügung. Dieser ermöglicht es, im Falle eines konstanten Signalverlaufs eine gewünschte MTF ohne Filterung zu erreichen. Bei veränderlichem Signalverlauf kann ein SNR Matched Filter angewendet werden, dessen negative Einflüsse auf die MTF durch Dichtegewichtung kompensiert werden. Somit ermöglicht Dichtegewichtung eine vorgegebene MTF und gleichzeitig ein optimales SNR. In der vorliegenden Arbeit wurde Dichtegewichtung erstmals bei den schnellen Multi-Echo-Sequenzen Turbo-Spin-Echo und Echoplanar-Bildgebung (EPI) angewendet. Im Gegensatz zu bisherigen Implementierungen muss hier der Signalabfall durch T2- bzw. T2*-Relaxation berücksichtigt werden. Dies führt dazu, dass eine prospektiv berechnete dichtegewichtete Verteilung nur bei einer Relaxationszeit optimal ist. Bei Geweben mit abweichenden Relaxationszeiten können sich wie auch bei den kartesischen Varianten dieser Sequenzen Änderungen an SRF und SNR ergeben. Bei dichtegewichteter Turbo-Spin-Echo-Bildgebung des Gehirns konnte mit den gewählten Sequenzparametern ein SNR-Vorteil von 43 % gegenüber der kartesischen Variante erzielt werden. Die Akquisition wurde dabei auf die T2-Relaxationszeit von weißer Substanz optimiert. Da die meisten Gewebe im Gehirn eine ähnliche Relaxationszeit aufweisen, blieb der visuelle Gesamteindruck identisch zur kartesischen Bildgebung. Der SNR-Gewinn konnte in der dichtegewichteten Implementierung zur Messzeithalbierung genutzt werden. Dichtegewichtete EPI weist eine hohe Anfälligkeit für geometrische Verzerrungen, welche durch Inhomogenitäten des Hauptmagnetfeldes verursacht werden, auf. Die Verzerrungen konnten erfolgreich mit einer Conjugate Phase-Methode korrigiert werden. Dazu muss die räumliche Verteilung der Feldinhomogenitäten bekannt sein. Dazu ist zusätzlich zur eigentlichen EPI-Aufnahme die zeitaufwendige Aufnahme einer sogenannten Fieldmap erforderlich. Im Rahmen dieser Arbeit konnte eine Methode entwickelt werden, welche die zur Erlangung einer Fieldmap notwendige Aufnahmedauer auf wenige Sekunden reduziert. Bei dieser Art der Fieldmap-Aufnahme müssen jedoch durch Atmung hervorgerufene Effekte auf die Bildphase berücksichtigt werden. Die Fieldmap-Genauigkeit kann durch Aufnahme unter Atempause, Mittelung oder retrospektiver Phasenkorrektur erhöht werden. Für die gewählten EPI-Sequenzparameter wurde mit Dichtegewichtung gegenüber der kartesischen Variante ein SNR-Gewinn von 14 % erzielt. Anhand einer funktionellen MRT (fMRI)-Fingertapping-Studie konnte demonstriert werden, dass die SNR-Steigerung auch zu einer signifikant erhöhten Aktivierungsdetektion in Teilen der Hirnareale führt, die bei der Fingerbewegung involviert sind. Die Verwendung von zusätzlicher EPI-Phasenkorrektur und iterativer Optimierung der dichtegewichteten k-Raum-Abtastung führt zu weiteren Verbesserungen der dichtegewichteten Bildgebung mit Multi-Echo-Sequenzen.
Growth factor induced signaling cascades are key regulatory elements in tissue development, maintenance and regeneration. Deregulation of the cascades has severe consequences, leading to developmental disorders and neoplastic diseases. As a major function in signal transduction, activating mutations in RAF family kinases are the cause of many human cancers. In the first project described in this thesis we focused on B-RAF V600E that has been identified as the most prevalent B-RAF mutant in human cancer. In order to address the oncogenic function of B-RAF V600E, we have generated transgenic mice expressing the activated oncogene specifically in lung alveolar epithelial type II cells. Constitutive expression of B-RAF V600E caused abnormalities in alveolar epithelium formation that led to airspace enlargements. These lung lesions showed signs of tissue remodeling and were often associated with chronic inflammation and low incidence of lung tumors. Inflammatory cell infiltration did not precede the formation of emphysema-like lesions but was rather accompanied with late tumor development. These data support a model where the continuous regenerative process initiated by oncogenic B-RAF-driven alveolar disruption provides a tumor-promoting environment associated with chronic inflammation. In the second project we focused on wild type B-RAF and its role in an oncogenic-C-RAF driven mouse lung tumor model. Toward this aim we have generated compound mice in which we could conditionally deplete B-RAF in oncogenic-C-RAF driven lung tumors. Conditional elimination of B-RAF did not block lung tumor formation however led to reduced tumor growth. The diminished tumor growth was not caused by increased cell death instead was a consequence of reduced cell proliferation. Moreover, B-RAF ablation caused a reduction in the amplitude of the mitogenic signalling cascade. These data indicate that in vivo B-RAF is dispensable for the oncogenic potential of active C-RAF; however it cooperates with oncogenic C-RAF in the activation of the mitogenic cascade.
1. Since the early nineteenth century describing (and understanding) patterns of distribution of biodiversity across the Earth has represented one of the most significant intellectual challenges to ecologists and biogeographers. Among the most striking patterns of species richness are: the latitudinal and elevational gradients, with peaks in number of species at low latitudes and somewhere at mid altitudes, although other patterns, e.g. declines with increasing elevation, are often observed. Even in highly diverse tropical regions, species richness is not evenly distributed but there are “hotspots” of biodiversity where an exceptional number of species, especially endemics, are concentrated. Unfortunately, such areas are also experiencing dramatic loss of habitat. Among vertebrate taxa, amphibians are facing the most alarming number of extinctions. Habitat destruction, pollution and emergence of infectious diseases such as chytridiomycosis, are causing worldwide population declines. Responses to these drivers can be multidirectional and subtle, i.e. they may not be captured at the species but at the genetic level. Moreover, present patterns of diversity can result from the influence of past geological, climatic and environmental changes.
In this study, I used a multidisciplinary and multilevel approach to understand how and to which extent the landscape influences amphibian diversity. Mount Kilimanjaro is an exceptional tropical region where the landscape is rapidly evolving due to land use changes; additionally, there is a broad lack of knowledge of its amphibian fauna. During two rainy seasons in 2011, I recorded anurans from the foothills to 3500 m altitude; in addition, I focused on two river frog species and collected tissue samples for genetic analysis and swabs for detection of chytridiomycosis, the deadly disease caused by Batrachochytrium dendrobatidis (Bd).
2. I analyzed how species richness and composition change with increasing elevation and anthropogenic disturbance. In order to disentangle the observed patterns of species diversity and distribution, I incorporated inferences from historical biogeography and compared the assemblage of Mt. Kilimanjaro and Mt. Meru (both recent volcanoes) with those of the older Eastern Arc Mountains. Species richness decreased with elevation and locally increased in presence of water bodies, but I did not detect effects of either anthropogenic disturbance or vegetation structure on species richness and composition. Moreover, I found a surprisingly low number of forest species. Historical events seem to underlie the current pattern of species distribution; the young age of Mt. Kilimanjaro and the complex biogeographic processes which occurred in East Africa during the last 20 million years prevented montane forest frogs from colonizing the volcano.
3. I focused on the genetic level of biodiversity and investigated how the landscape, i.e. elevation, topographic relief and land cover, influence genetic variation, population structure and gene flow of two ecologically similar and closely related river frog species, namely Amietia angolensis and Amietia wittei. I detected greater genetic differentiation among populations in the highland species (A. wittei) and higher genetic variation in the lowland species (A. angolensis), although genetic diversity was not significantly correlated with elevation. Importantly, human settlements seemed to restrict gene flow in A. angolensis, whereas steep slopes were positively correlated with gene flow in A. wittei. This results show that even ecologically similar species can respond differently to landscape processes and that the spatial configuration of topographic features combined with species-specific biological attributes can affect dispersal and gene flow in disparate ways.
4. River frogs of the genus Amietia seem to be particularly susceptible to chytridiomycosis, showing the highest pathogen load in Kenya and other African countries. In the last study, I collected swab samples from larvae of A. angolensis and A. wittei for Bd detection. Both species resulted Bd-positive. The presence of Bd on Mt. Kilimanjaro has serious implication. For instance, Bd can be transported by footwear of hikers from contaminated water and soil. Tourists visiting Mt. Kilimanjaro may translocate Bd zoospores to other areas such as the nearby Eastern Arc Mts. where endemic and vulnerable species may still be naïve to the fungus and thus suffer of population declines.
5. My study significantly contributed to the knowledge of the amphibian fauna of Mt. Kilimanjaro and of East Africa in general, and it represents a valuable tool for future conservation actions and measures. Finally, it highlights the importance of using a multidisciplinary (i.e. community ecology, historical biogeography, landscape genetics, disease ecology) and multilevel (i.e. community, species, population, gene) approach to disentangle patterns of biodiversity.
Die nicht-invasive Gefäßdiagnostik stellt einen wichtigen Pfeiler in der Prävention von Herz-Kreislauferkrankungen dar. Während lange Zeit die sonographische Messung der cIMT, als morphologisches Korrelat der Gefäßalterung, als Goldstandard galt, ist in den letzten Jahren in Gestalt der Pulswellenanalyse/PWV-Messung eine Technik weiterentwickelt worden, die, als funktionelles Korrelat der Gefäßalterung, aufgrund der leichteren Durchführbarkeit und geringerer Untersucherabhängigkeit und Kosten vielversprechend ist. So erlaubt die Messung der Pulswelle mittels gewöhnlicher Blutdruckmanschetten, genau wie die cIMT, die Berechnung des individuellen Gefäßalters und die Diagnostik für das Vorliegen eines Endorganschadens der Blutgefäße.
Um die Messergebnisse der beiden Untersuchungen miteinander zu vergleichen, wurden beide in der EUROASPIRE-IV Studie an Patienten mit koronarer Herzkrankheit durchgeführt. Die Auswertung der Messergebnisse der mit dem Vascular Explorer durchgeführten Pulswellenanalyse/PWV-Messung ergab überraschenderweise, dass die Mehrheit der herzkranken Patienten weder eine vaskuläre Voralterung noch einen Endorganschaden der Blutgefäße aufweisen. Im Falle der cIMT-Messung war Gegenteiliges der Fall, was trotz der medikamentösen Therapie der Patienten so zu erwarten war. Weiterhin zeigte sich lediglich eine geringe Korrelation zwischen den Messergebnissen beider Untersuchungen. Die Determinanten der einzelnen Messwerte aus cIMT und Pulswellenanalyse/PWV-Messung waren deckungsgleich mit den in der Literatur beschriebenen Faktoren, wenn auch viele der sonst signifikanten Regressoren das Signifikanzniveau in unserer Auswertung nicht unterschritten.
Eine Limitation der funktionellen Gefäßdiagnostik liegt derzeit darin, dass die Messergebnisse stark von dem verwendeten Messgerät abhängen. Es liegen noch zu wenig Vergleichsstudien vor, um die Messergebnisse, speziell von neueren Geräten wie dem Vascular Explorer, auf andere zu übertragen. Bei der Berechnung des Gefäßalters sollten daher optimalerweise gerätespezifische Normwerte vorliegen, was beim Vascular Explorer nicht der Fall ist. Gleiches gilt für die Verwendung des PWVcf-Grenzwerts für die Diagnose eines Endorganschadens der Blutgefäße.
Analog hat auch die Messung der cIMT gewisse Einschränkungen. So wäre eine weitere Standardisierung der Messorte (A. carotis communis vs Bulbus vs A. carotis interna), zwischen denen sich die durchschnittliche cIMT erheblich unterscheidet, sowie der Messparameter (Minimal- vs Maximal- vs Mittelwert) wünschenswert. Die universelle Anwendung eines cIMT-Grenzwerts zur Diagnose eines Endorganschadens der Blutgefäße ist daher kritisch zu sehen. Dies zeigt sich auch darin, dass in den neuesten Leitlinien der bislang geltende Grenzwert angezweifelt und kein aktuell gültiger Grenzwert mehr genannt wird.
Wir interpretieren unsere Ergebnisse dahingehend, dass unsere Messung der cIMT die zu erwartende pathologische Gefäßalterung bei Patienten mit koronarer Herzkrankheit besser widerspiegelt als die Messung der Pulswelle mit dem Vascular Explorer. Welche der beiden Untersuchungen hinsichtlich der prognostischen Wertigkeit überlegen ist, muss im Rahmen von Längsschnittstudien geklärt werden.
Aging is known to be a risk factor for structural abnormalities and functional decline in the nervous system. Characterizing age-related changes is important to identify putative pathways to overcome deleterious effects and improve life quality for the elderly. In this study, the peripheral nervous system of 24-month-old aged C57BL/6 mice has been investigated and compared to 12-month-old adult mice. Aged mice showed pathological alterations in their peripheral nerves similar to nerve biopsies from elderly human individuals, with nerve fibers showing demyelination and axonal damage. Such changes were lacking in nerves of adult 12-month-old mice and adult, non-aged humans. Moreover, neuromuscular junctions of 24-month-old mice showed increased denervation compared to adult mice. These alterations were accompanied by elevated numbers of macrophages in the peripheral nerves of aged mice. The neuroinflammatory conditions were associated with impaired myelin integrity and with a decline of nerve conduction properties and muscle strength in aged mice.
To determine the pathological impact of macrophages in the aging mice, macrophage depletion was performed in mice by oral administration of CSF-1R specific kinase (c-FMS) inhibitor PLX5622 (300 mg/kg body weight), which reduced the number of macrophages in the peripheral nerves by 70%. The treated mice showed attenuated demyelination, less muscle denervation and preserved muscle strength. This indicates that macrophage-driven inflammation in the peripheral nerves is partially responsible for the age-related neuropathy in mice.
Based on previous observations that systemic inflammation can accelerate disease progression in mouse models of neurodegenerative diseases, it was hypothesized that systemic inflammation can exacerbate the peripheral neuropathy found in aged mice. To investigate this hypothesis, aged C57BL/6 mice were intraperitoneally injected with a single dose of lipopolysaccharide (LPS; 500 μg/kg body weight) to induce systemic inflammation by mimicking bacterial infection, mostly via activation of Toll-like receptors (TLRs). Altered endoneurial macrophage activation, highlighted by Trem2 downregulation, was found in LPS injected aged mice one month after injection. This was accompanied by a so far rarely observed form of axonal perturbation, i.e., the occurrence of “dark axons” characterized by a damaged cytoskeleton and an increased overall electron density of the axoplasm. At the same time, however, LPS injection reduced demyelination and muscle denervation in aged mice. Interestingly, TREM2 deficiency in aged mice led to similar changes to LPS injection. This suggests that LPS injection likely mitigates aging-related demyelination and muscle denervation via Trem2 downregulation.
Taken together, this study reveals the role of macrophage-driven inflammation as a pathogenic mediator in age-related peripheral neuropathy, and that targeting macrophages might be an option to mitigate peripheral neuropathies in aging individuals. Furthermore, this study shows that systemic inflammation may be an ambivalent modifier of age-related nerve damage, leading to a distinct type of axonal perturbation, but in addition to functionally counteracting, dampened demyelination and muscle denervation. Translationally, it is plausible to assume that tipping the balance of macrophage polarization to one direction or the other may determine the functional outcome in the aging peripheral nervous system of the elderly.