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Institute
- Theodor-Boveri-Institut für Biowissenschaften (131)
- Graduate School of Life Sciences (85)
- Medizinische Klinik und Poliklinik II (61)
- Institut für Anorganische Chemie (60)
- Medizinische Klinik und Poliklinik I (49)
- Neurologische Klinik und Poliklinik (45)
- Universität - Fakultätsübergreifend (45)
- Klinik und Poliklinik für Allgemein-, Viszeral-, Gefäß- und Kinderchirurgie (Chirurgische Klinik I) (38)
- Institut für Organische Chemie (37)
- Institut für Psychologie (37)
Sonstige beteiligte Institutionen
- DFG Forschungsgruppe 2757 / Lokale Selbstregelungen im Kontext schwacher Staatlichkeit in Antike und Moderne (LoSAM) (2)
- Siemens AG (2)
- Agricultural Center, BASF SE, 67117 Limburgerhof, Germany (1)
- Akademie der Wissenschaften und der Literatur, Mainz (1)
- Bayer AG, Research & Development, Pharmaceuticals, Investigational Toxicology (1)
- Betriebsärztlicher Dienst der Universität Würzburg (1)
- Center of Excellence for Science and Technology - Integration of Mediterranean region (STIM), Faculty of Science, University of Split, Poljička cesta 35, 2100 Split, Croatia (1)
- Comprehensive Cancer Center Mainfranken (1)
- Core Unit Systemmedizin (1)
- Departamento de Química, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain (1)
Bioactivity-guided fractionation of a methanolic extract of the Red Sea cucumber Holothuria spinifera and LC-HRESIMS-assisted dereplication resulted in the isolation of four compounds, three new cerebrosides, spiniferosides A (1), B (2), and C (3), and cholesterol sulfate (4). The chemical structures of the isolated compounds were established on the basis of their 1D NMR and HRMS spectral data. Metabolic profiling of the H. spinifera extract indicated the presence of diverse secondary metabolites, mostly hydroxy fatty acids, diterpenes, triterpenes, and cerebrosides. The isolated compounds were tested for their in vitro cytotoxicities against the breast adenocarcinoma MCF-7 cell line. Compounds 1, 2, 3, and 4 displayed promising cytotoxic activities against MCF-7 cells, with IC\(_{50}\) values of 13.83, 8.13, 8.27, and 35.56 µM, respectively, compared to that of the standard drug doxorubicin (IC\(_{50}\) 8.64 µM). Additionally, docking studies were performed for compounds 1, 2, 3, and 4 to elucidate their binding interactions with the active site of the SET protein, an inhibitor of protein phosphatase 2A (PP2A), which could explain their cytotoxic activity. This study highlights the important role of these metabolites in the defense mechanism of the sea cucumber against fouling organisms and the potential uses of these active molecules in the design of new anticancer agents.
Bioactivity-guided isolation supported by LC-HRESIMS metabolic profiling led to the isolation of two new compounds, a ceramide, stylissamide A (1), and a cerebroside, stylissoside A (2), from the methanol extract of the Red Sea sponge Stylissa carteri. Structure elucidation was achieved using spectroscopic techniques, including 1D and 2D NMR and HRMS. The bioactive extract’s metabolomic profiling showed the existence of various secondary metabolites, mainly oleanane-type saponins, phenolic diterpenes, and lupane triterpenes. The in vitro cytotoxic activity of the isolated compounds was tested against two human cancer cell lines, MCF-7 and HepG2. Both compounds, 1 and 2, displayed strong cytotoxicity against the MCF-7 cell line, with IC\(_{50}\) values at 21.1 ± 0.17 µM and 27.5 ± 0.18 µM, respectively. They likewise showed a promising activity against HepG2 with IC\(_{50}\) at 36.8 ± 0.16 µM for 1 and IC\(_{50}\) 30.5 ± 0.23 µM for 2 compared to the standard drug cisplatin. Molecular docking experiments showed that 1 and 2 displayed high affinity to the SET protein and to inhibitor 2 of protein phosphatase 2A (I2PP2A), which could be a possible mechanism for their cytotoxic activity. This paper spreads light on the role of these metabolites in holding fouling organisms away from the outer surface of the sponge, and the potential use of these defensive molecules in the production of novel anticancer agents.
Thalassodendron ciliatum (Forssk.) Den Hartog is a seagrass belonging to the plant family Cymodoceaceae with ubiquitous phytoconstituents and important pharmacological potential, including antioxidant, antiviral, and cytotoxic activities. In this work, a new ergosterol derivative named thalassosterol (1) was isolated from the methanolic extract of T. ciliatum growing in the Red Sea, along with two known first-reported sterols, namely ergosterol (2) and stigmasterol (3), using different chromatographic techniques. The structure of the new compound was established based on 1D and 2D NMR spectroscopy and high-resolution mass spectrometry (HR-MS) and by comparison with the literature data. The new ergosterol derivative showed significant in vitro antiproliferative potential against the human cervical cancer cell line (HeLa) and human breast cancer (MCF-7) cell lines, with IC\(_{50}\) values of 8.12 and 14.24 µM, respectively. In addition, docking studies on the new sterol 1 explained the possible binding interactions with an aromatase enzyme; this inhibition is beneficial in both cervical and breast cancer therapy. A metabolic analysis of the crude extract of T. ciliatum using liquid chromatography combined with high-resolution electrospray ionization mass spectrometry (LC-ESI-HR-MS) revealed the presence of an array of phenolic compounds, sterols and ceramides, as well as di- and triglycerides.
Die Aktivierung des HGF/c-Met-Signalweges wird unter anderem seit längerer Zeit als verantwortlicher Mechanismus für die Entwicklung von Resistenzen gegen den EGF-Rezeptor gerichteter Medikamente diskutiert. In verschiedenen Studien konnte die klinische Bedeutung des HGF/c-Met-Signalwegs belegt werden.
In der jüngeren Vergangenheit konzentriert sich die Forschung immer mehr auf das Tumormikromilieu und dessen Einfluss auf die Tumorprogression. So konnte gezeigt werden, dass erhöhte Laktatwerte, resultierend aus einer gesteigerten Glykolyse, zytotoxische T-Zellen inhibieren.
Es wurden vier etablierte Zelllinien des oralen Plattenepithelkarzinoms sowie eine Zelllinie eines Mukoepidermoidkarzinom verwendet, um den Einfluss von HGF und des Tyrosinkinaseinhibitors Foretinib auf den Glukosemetabolismus zu prüfen.
Bei allen Zelllinien konnte der c-Met-Rezeptor nachgewiesen werden. Ebenso konnte in einem ELISA belegt werden, dass die Zelllinien selbst kein HFG produzieren.
Es wurden proliferationsfördernde Effekte für HGF sowie zytotoxische Effekte durch Foretinib aufgezeigt. Ferner konnte der proliferationsfördernde Effekt durch HGF durch die Behandlung mit Foretinib aufgehoben werden.
Im RT-PCR-Verfahren wurden die Auswirkungen auf die Transkription verschiedener Gene, die für wichtige Enzyme des Glukosemetabolismus kodieren, nach der Stimulation mit HGF sowie der Inhibition mit Foretinib untersucht. Es konnten substanzielle Veränderungen in der Expression einzelner Gene nachgewiesen werden. Zelllinienübergreifend konnte allerdings keine verstärkte bzw. verminderte Transkription durch die Behandlung mit HGF bzw. Foretinib nachgewiesen werden. Die Ergebnisse lassen auf die Komplexität der Regulierung des Glukosemetabolismus schließen.
In der Durchflusszytometrie konnte gezeigt werden, dass eine Behandlung mit HGF nicht zu einer Zunahme des GLUT1 in der Zellmembran führt, wohingegen eine Behandlung mit Foretinib mit einer gesteigerten Menge von GLUT1 einhergeht. Die Ergebnisse der vorliegenden Arbeit belegen einen Einfluss des HGF/c-Met-Signalwegs auf den Glukosemetabolismus bei Zelllinien des oralen Plattenepithelkarzinoms.
Ziel dieser Arbeit war es, die Auswirkungen der Änderungen der Therapiestandards in der Behandlung des Kolonkarzinoms und die Auswirkungen der Einführung der Vorsorgekoloskopie auf die Überlebensraten der Patienten mit Kolonkarzinom zu untersuchen.
Die umfassende Analyse der therapieabhängigen Überlebensraten von 1016 Patienten mit Kolonkarzinom aus 20 Jahren zeigt eine Verbesserung der Überlebenswahrscheinlichkeit durch den Einsatz adjuvanter Therapie und multimodaler Therapieregime. Durch Neuerungen in der Therapie konnten die 5-Jahres-Überlebensraten seit Anfang der 90er Jahre nahezu verdoppelt werden. Als wichtigste Prädiktoren für das Langzeitüberleben stellten sich das Alter der Patienten bei Erstdiagnose, das UICC Stadium und die Art der adjuvanten Therapie heraus. Der Überlebenszeit verlängernde Effekt war für den Einsatz der heutigen Standardtherapie mit 5-Flourouracil (5-FU) schon signifikant und zeigt sich für die Kombination mit neueren Medikamenten, insbesondere Oxaliplatin, noch deutlicher. Neue Operationstechniken, Fortschritte in der Metastasenchirurgie, ein optimiertes supportives Management und weitere Erkenntnisse onkologischer Prinzipien beeinflussten die erzielten Erfolge synergistisch.
Das Gesamtüberleben der Patienten, die per Vorsorgekoloskopie detektiert werden ist besser als das der Patienten, die aufgrund klinischer Symptome diagnostiziert werden. Neben dem signifikanten Überlebensvorteil der Früherkennungs-Patienten, der sich durch die niedrigeren UICC Stadien in dieser Gruppe ergibt, finden sich auch Trends bezüglich eines besseren Outcomes dieser Patienten innerhalb der selben UICC Stadien. Die Patienten, deren Tumor im Rahmen des Screenings detektiert wurde, waren signifikant jünger, wiesen signifikant weniger Begleiterkrakungen auf und zeigten signifikant niedrigere Tumorstadien. Eine adjuvante Therapie wurde in der Screening-Gruppe signifikant häufiger durchgeführt. Mehr als einer von fünf tumorbedingten Todesfällen der Patienten, die augrund von Symptomen diagnostiziert wurden, hätte in dieser Studienpopulation verhindert werden können, wenn eine routinemäßige Vorsorgekoloskopie durchgeführt worden wäre.
Das Fazit lautet: die Vorsorgekoloskopie ist effektiv. Die Tumorgenese kann durch Entfernung von Voräuferläsionen durchbrochen werden, Tumoren können in frühen asymptomatischen Stadien detektiert werden. Screeningprogramme sollten erweitert werden, um die Inzidenz und die Mortalität von Darmkrebs weiter zu senken.
Infants and young children (IYC) remain the most vulnerable population group to environmental hazards worldwide, especially in economically developing regions such as sub-Saharan Africa (SSA). As a result, several governmental and non-governmental institutions including health, environmental and food safety networks and researchers have been proactive toward protecting this group. Mycotoxins, toxic secondary fungal metabolites, contribute largely to the health risks of this young population. In SSA, the scenario is worsened by socioeconomic status, poor agricultural and storage practices, and low level of awareness, as well as the non-establishment and lack of enforcement of regulatory limits in the region. Studies have revealed mycotoxin occurrence in breast milk and other weaning foods. Of concern is the early exposure of infants to mycotoxins through transplacental transfer and breast milk as a consequence of maternal exposure, which may result in adverse health effects. The current paper presents an overview of mycotoxin occurrence in foods intended for IYC in SSA. It discusses the imperative evidence of mycotoxin exposure of this population group in SSA, taking into account consumption data and the occurrence of mycotoxins in food, as well as biomonitoring approaches. Additionally, it discusses the health implications associated with IYC exposure to mycotoxins in SSA.
Context
Primary aldosteronism (PA) is the most frequent form of endocrine hypertension. Besides its deleterious impact on cardiovascular target organ damage, PA is considered to cause osteoporosis.
Patients and methods
We assessed bone turnover in a subset of 36 postmenopausal women with PA. 18 patients had unilateral PA and were treated by adrenalectomy, whereas 18 patients had bilateral PA and received mineralocorticoid receptor antagonist (MRA) therapy respectively. 18 age- and BMI-matched females served as controls. To estimate bone remodeling, we measured the bone turnover markers intact procollagen 1 N-terminal propeptide, bone alkaline phosphatase, osteocalcin and tartrate resistant acid phosphatase 5b in plasma by chemiluminescent immunoassays at time of diagnosis and one year after initiation of treatment.
Study design
Observational longitudinal cohort study.
Setting
Tertiary care hospital.
Results
Compared with controls, patients with PA had mildly elevated osteocalcin at baseline (p = 0.013), while the other bone markers were comparable between both groups. There were no differences between the unilateral and the bilateral PA subgroup. One year after initiation of MRA treatment with spironolactone bone resorption and bone formation markers had significantly decreased in patients with bilateral PA. In contrast, patients adrenalectomized because of unilateral PA showed no significant change of bone turnover markers.
Conclusion
This study shows that aldosterone excess in postmenopausal women with PA is not associated with a relevant increase of bone turnover markers at baseline. However, we observed a significant decrease of bone markers in patients treated with spironolactone, but not in patients treated by adrenalectomy.
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.
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.
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.
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.
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.
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.
Hintergrund: Circa ein Drittel der Patientinnen und Patienten mit fortgeschrittenen Krebserkrankungen ist von psychischen Komorbiditäten betroffen und circa die Hälfte weist eine psychische Belastung im klinisch signifikanten Bereich auf. Zur psychotherapeutischen Behandlung dieser Patientengruppe stehen unterschiedliche psychotherapeutische Interventionen zur Verfügung. Die CALM-Therapie, eine manualisierte Kurzintervention im Einzelsetting, ist eine dieser Interventionen. Hier bilden vier Module, welche auf den wichtigsten Anliegen und Belastungsfaktoren von Patientinnen und Patienten mit fortgeschrittenen Krebserkrankungen basieren, den inhaltlichen Rahmen.
Ziel: Die Treatment Integrity beschreibt das Maß, inwieweit eine psychotherapeutische Intervention wie vorgesehen umgesetzt wurde. Für eine fundierte Interpretation psychotherapeutischer Interventionseffekte sind Kenntnisse über die Treatment Integrity entscheidend. Die vorliegende Arbeit untersuchte Teilaspekte der Treatment Integrity durchgeführter CALM-Therapien im Vergleich zu durchgeführten konventionellen psychoonkologischen Therapien, um einen Beitrag zu einer fundierten Interpretation von Interventionseffekten der CALM-Therapie zu leisten.
Methoden: Transkriptionen von zwei CALM-Therapien und zwei Therapien einer konventionellen psychoonkologischen Intervention wurden anhand einer qualitativen Inhaltsanalyse nach P. Mayring untersucht. Im Zentrum stand hierbei ein selbst entwickeltes Kategoriensystem zur Analyse des gesamten Textmaterials. Zusätzlich wurden Auffälligkeiten bezüglich Ansprachen von Themenbereichen der CALM-Module unsystematisch beobachtet.
Ergebnisse: Die Inhalte der untersuchten CALM-Therapien bezogen sich durchschnittlich zu 99,54% und die der konventionellen psychoonkologischen Therapien durchschnittlich zu 98,71% auf die Themenbereiche der CALM-Module. Die ermittelten Werte für einzelne Therapiesitzungen lagen für CALM-Sitzungen zwischen 98,12% und 100% und für Sitzungen der konventionellen psychoonkologischen Therapie zwischen 96,20% und 100%. Unsystematisch beobachtete Auffälligkeiten zeigten, dass die Themenbereiche der CALM-Module zum Teil sehr spezifisch durch die CALM-Therapeutinnen und -Therapeuten angesprochen und vernetzt wurden.
Schlussfolgerung: Unter Berücksichtigung von methodischen Grenzen zeigte sich bezüglich des Anteils von Themenbereichen der CALM-Module innerhalb der beiden untersuchten Therapiegruppen kein maßgeblicher Unterschied. Zusätzlich liefert die vorliegende Arbeit Hinweise für einen spezifischen therapeutischen Umgang mit den Themenbereichen der CALM-Module innerhalb der untersuchten CALM-Therapien. Um ermittelte Interventionseffekte der CALM-Therapie fundiert interpretieren zu können, sollten zukünftige Untersuchungen unterschiedliche Umgangsweisen von Therapeutinnen und Therapeuten der beiden Therapiegruppen mit den Themenbereichen der CALM-Module genauer in den Blick nehmen.
Frizzled (FZD) are highly conserved receptors that belong to class F of the G protein-coupled receptor (GPCR) superfamily. They are involved in a great variety of processes during embryonic development, organogenesis, and adult tissue homeostasis. In particular, FZD5 is an important therapeutic target due to its involvement in several pathologies, such as tumorigenesis. Nevertheless, little is known regarding the activation of FZD receptors and the signal initiation, and their GPCR nature has been debated. In order to investigate the activation mechanism of these receptors, FRET (Förster Resonance Energy Transfer)-based biosensors for FZD5 have been developed and characterized. A cyan fluorescent protein (CFP) was fused to the C-terminus of the receptor and the specific FlAsH-binding sequence (CCPGCC) was inserted within the 2nd or the 3rd intracellular loop. Single-cell FRET experiments performed using one of these sensors, V5-mFZD5-FlAsH436-CFP, reported structural rearrangements in FZD5 upon stimulation with the endogenous ligand WNT-5A. These movements are similar to those observed in other GPCRs using the same technique, which suggests an activation mechanism for FZD reminiscent of GPCRs. Furthermore, stimulation of the FZD5 FRET-based sensor with various recombinant WNT proteins in a microplate FRET reader allowed to obtain concentration-response curves for several ligands, being possible to distinguish between full and partial agonists. This technology allowed to address the selectivity between WNTs and FZD5 using a full-length receptor in living cells. In addition, G protein FRET-based sensors revealed that WNT-5A specifically induced Gαq activation mediated by FZD5, but not Gαi activation. Other WNT proteins were also able to induce Gαq activation, but with lower efficacy than WNT-5A. In addition, a dual DAG/calcium sensor further showed that WNT-5A stimulation led to the activation of the Gαq-dependent signaling pathway mediated by FZD5, which outcome was the activation of Protein Kinase C (PKC) and the release of intracellular calcium. Altogether, these data provide evidence that the activation process of FZD5 resembles the general characteristics of class A and B GPCR activation, and this receptor also mediates the activation of the heterotrimeric Gαq protein and its downstream signaling pathway. In addition, the FZD5 receptor FRET-based sensor provides a valuable tool to characterize the pharmacological properties of WNTs and other potential ligands for this receptor.
Patients affected by gastroenteropancreatic–neuroendocrine tumors (GEP–NETs) have an increased risk of developing osteopenia and osteoporosis, as several factors impact on bone metabolism in these patients. In fact, besides the direct effect of bone metastasis, bone health can be affected by hormone hypersecretion (including serotonin, cortisol, and parathyroid hormone-related protein), specific microRNAs, nutritional status (which in turn could be affected by medical and surgical treatments), and vitamin D deficiency. In patients with multiple endocrine neoplasia type 1 (MEN1), a hereditary syndrome associated with NET occurrence, bone damage may carry other consequences. Osteoporosis may negatively impact on the quality of life of these patients and can increment the cost of medical care since these patients usually live with their disease for a long time. However, recommendations suggesting screening to assess bone health in GEP–NET patients are missing. The aim of this review is to critically analyze evidence on the mechanisms that could have a potential impact on bone health in patients affected by GEP–NET, focusing on vitamin D and its role in GEP–NET, as well as on factors associated with MEN1 that could have an impact on bone homeostasis.
Mitotane is the only approved drug for advanced adrenocortical carcinoma (ACC) and no biomarkers are available to predict attainment of therapeutic plasma concentrations and clinical response. Aim of the study was to evaluate the suitability of cytochrome P450(CYP)2W1 and CYP2B6 single nucleotide polymorphisms (SNPs) as biomarkers. A multicenter cohort study including 182 ACC patients (F/M = 121/61) treated with mitotane monotherapy after radical resection (group A, n = 103) or in not completely resectable, recurrent or advanced disease (group B, n = 79) was performed. CYP2W1*2, CYP2W1*6, CYP2B6*6 and CYP2B6 rs4803419 were genotyped in germline DNA. Mitotane blood levels were measured regularly. Response to therapy was evaluated as time to progression (TTP) and disease control rate (DCR). Among investigated SNPs, CYP2W1*6 and CYP2B6*6 correlated with mitotane treatment only in group B. Patients with CYP2W1*6 (n = 21) achieved less frequently therapeutic mitotane levels (>14 mg/L) than those with wild type (WT) allele (76.2% vs 51.7%, p = 0.051) and experienced shorter TTP (HR = 2.10, p = 0.019) and lower DCR (chi-square = 6.948, p = 0.008). By contrast, 55% of patients with CYP2B6*6 vs. 28.2% WT (p = 0.016) achieved therapeutic range. Combined, a higher rate of patients with CYP2W1*6WT+CYP2B6*6 (60.6%) achieved mitotane therapeutic range (p = 0.034). In not completely resectable, recurrent or advanced ACC, CYP2W1*6 SNP was associated with a reduced probability to reach mitotane therapeutic range and lower response rates, whereas CYP2B6*6 correlated with higher mitotane levels. The association of these SNPs may predict individual response to mitotane.
The Gram-negative Epsilonproteobacterium Campylobacter jejuni is currently the most prevalent bacterial foodborne pathogen. Like for many other human pathogens, infection studies with C. jejuni mainly employ artificial animal or cell culture models that can be limited in their ability to reflect the in-vivo environment within the human host. Here, we report the development and application of a human three-dimensional (3D) infection model based on tissue engineering to study host-pathogen interactions. Our intestinal 3D tissue model is built on a decellularized extracellular matrix scaffold, which is reseeded with human Caco-2 cells. Dynamic culture conditions enable the formation of a polarized mucosal epithelial barrier reminiscent of the 3D microarchitecture of the human small intestine. Infection with C. jejuni demonstrates that the 3D tissue model can reveal isolate-dependent colonization and barrier disruption phenotypes accompanied by perturbed localization of cell-cell junctions. Pathogenesis-related phenotypes of C. jejuni mutant strains in the 3D model deviated from those obtained with 2D-monolayers, but recapitulated phenotypes previously observed in animal models. Moreover, we demonstrate the involvement of a small regulatory RNA pair, CJnc180/190, during infections and observe different phenotypes of CJnc180/190 mutant strains in 2D vs. 3D infection models. Hereby, the CJnc190 sRNA exerts its pathogenic influence, at least in part, via repression of PtmG, which is involved in flagellin modification. Our results suggest that the Caco-2 cell-based 3D tissue model is a valuable and biologically relevant tool between in-vitro and in-vivo infection models to study virulence of C. jejuni and other gastrointestinal pathogens.
Despite important advances in diagnosis and treatment, heart failure (HF) remains a syndrome with substantial morbidity and dismal prognosis. Although implementation and optimization of existing technologies and drugs may lead to better management of HF, new or alternative strategies are desirable. In this regard, basic science is expected to give fundamental inputs, by expanding the knowledge of the pathways underlying HF development and progression, identifying approaches that may improve HF detection and prognostic stratification, and finding novel treatments. Here, we discuss recent basic science insights that encompass major areas of translational research in HF and have high potential clinical impact.
Neurotrophin signaling via receptor tyrosine kinases is essential for the development and function of the nervous system in vertebrates. TrkB activation and signaling show substantial differences to other receptor tyrosine kinases of the Trk family that mediate the responses to nerve growth factor and neurotrophin-3. Growing evidence suggests that TrkB cell surface expression is highly regulated and determines the sensitivity of neurons to brain-derived neurotrophic factor (BDNF). This translocation of TrkB depends on co-factors and modulators of cAMP levels, N-glycosylation, and receptor transactivation. This process can occur in very short time periods and the resulting rapid modulation of target cell sensitivity to BDNF could represent a mechanism for fine-tuning of synaptic plasticity and communication in complex neuronal networks. This review focuses on those modulatory mechanisms in neurons that regulate responsiveness to BDNF via control of TrkB surface expression.
Aims
Heart failure (HF) leads to repeat hospitalisations and reduces the duration and quality of life. Pulmonary artery pressure (PAP)‐guided HF management using the CardioMEMS™ HF system was shown to be safe and reduce HF hospitalisation (HFH) rates in New York Heart Association (NYHA) class III patients. However, these findings have not been replicated in health systems outside the United States. Therefore, the CardioMEMS European Monitoring Study for Heart Failure (MEMS‐HF) evaluated the safety, feasibility, and performance of this device in Germany, The Netherlands, and Ireland.
Methods and results
A total of 234 NYHA class III patients (68 ± 11 years, 22% female, ≥1 HFH in the preceding year) from 31 centres were implanted with a CardioMEMS sensor and underwent PAP‐guided HF management. One‐year rates of freedom from device‐ or system‐related complications and from sensor failure (co‐primary outcomes) were 98.3% [95% confidence interval (CI) 95.8–100.0] and 99.6% (95% CI 97.6–100.0), respectively. Survival rate was 86.2%. For the 12 months post‐ vs. pre‐implant, HFHs decreased by 62% (0.60 vs. 1.55 events/patient‐year; hazard ratio 0.38, 95% CI 0.31–0.48; P < 0.0001). After 12 months, mean PAP decreased by 5.1 ± 7.4 mmHg, Kansas City Cardiomyopathy Questionnaire (KCCQ) overall/clinical summary scores increased from 47.0 ± 24.0/51.2 ± 24.8 to 60.5 ± 24.3/62.4 ± 24.1 (P < 0.0001), and the 9‐item Patient Health Questionnaire sum score improved from 8.7 ± 5.9 to 6.3 ± 5.1 (P < 0.0001).
Conclusion
Haemodynamic‐guided HF management proved feasible and safe in the health systems of Germany, The Netherlands, and Ireland. Physician‐directed treatment modifications based on remotely obtained PAP values were associated with fewer HFH, sustainable PAP decreases, marked KCCQ improvements, and remission of depressive symptoms.
Using own survey data and interviews, this study analyzes how businesses in Lower Franconia (Unterfranken) are entangled with China. Starting with a bird's-eye-view of the current situation, the study goes on to provide valuable insights from five specific industries. The study shows that a majority of the analyzed firms have some sort of ties to China, be it through Chinese customers, import/export activities, or else.
Der Ausbau der regenerativen Energiequellen führt vermehrt zu unvorhersehbaren Schwankungen der erzeugten Leistung, da Windkraft und Photovoltaik von natürlichen Bedingungen abhängen. Gerade Kurzzeitfluktuationen im Sekunden- bis Minutenbereich, die bei Solarzellen durch die Verschattung von vorüberziehenden Wolken zustande kommen, wird bislang wenig Beachtung geschenkt. Kurzzeitspeicher müssen eine hohe Zyklenstabilität aufweisen, um zur Glättung dieser Leistungsfluktuationen in Frage zu kommen. Im Rahmen der vorliegenden Dissertation wurden elektrochemische Doppelschichtkondensatoren für die Kopplung mit Siliziumsolarzellen und organischen Solarmodulen mit Hilfe von Simulationen und Messungen untersucht. Zusätzlich wurden grundlegende Fragestellungen zur Prozessierung und Alterung von Doppelschichtkondensatoren im Hinblick auf ein in der Literatur bereits diskutiertes System betrachtet, das beide Komponenten in einem Bauteil integriert - den sogenannten photocapacitor.
Um die Druckbarkeit des gesamten elektrochemischen Doppelschichtkondensators zu ermöglichen, wurde der konventionell verwendete Flüssigelektrolyt durch einen Polymer-Gel-Elektrolyten auf Basis von Polyvinylalkohol und einer Säure ersetzt. Durch eine Verbesserung der Prozessierung konnte ein größerer Anteil der spezifischen Fläche der porösen Kohlenstoffelektroden vom Elektrolyten benetzt und somit zur Speicherung genutzt werden. Die Untersuchungen zeigen, dass mit Polymer-Gel-Elektrolyten ähnliche Kapazitäten erreicht werden wie mit Flüssigelektrolyten. Im Hinblick auf die Anwendung im gekoppelten System muss der elektrochemische Doppelschichtkondensator den gleichen Umweltbedingungen hinsichtlich Temperatur und Luftfeuchte standhalten wie die Solarzelle. Hierzu wurden umfangreiche Alterungstests durchgeführt und festgestellt, dass die Kapazität zwar bei Austrocknung des wasserhaltigen Polymer-Gel-Elektrolyten sinkt, bei einer Wiederbefeuchtung aber auch eine Regeneration des Speichers erfolgt.
Zur passenden Auslegung des elektrochemischen Doppelschichtkondensators wurde eine detaillierte Analyse der Leistungsfluktuationen durchgeführt, die mit einem eigens entwickelten MPP-Messgerät an organischen Solarmodulen gemessen wurden. Anhand der Daten wurde analysiert, welche Energiemengen für welche Zeit im Kurzzeitspeicher zwischengespeichert werden müssen, um eine effiziente Glättung der ins Netz einzuspeisenden Leistung zu erreichen. Aus der Statistik der Fluktuationen wurde eine Kapazität berechnet, die als Richtwert in die Simulationen einging und dann mit anderen Kapazitäten verglichen wurde. Neben einem idealen MPP-Tracking für verschiedene Arten von Solarzellen und Beleuchtungsprofilen konnte die Simulation auch die Kopplung aus Solarzelle und elektrochemischem Doppelschichtkondensator mit zwei verschiedenen Betriebsstrategien nachbilden. Zum einen wurde ein fester Lastwiderstand genutzt, zum anderen eine Zielspannung für den Kurzzeitspeicher und somit auch die Solarzelle vorgegeben und der Lastwiderstand variabel so angepasst, dass die Zielspannung gehalten wird. Beide Betriebsmethoden haben einen Energieverlust gegenüber der MPP-getrackten Solarzelle zu verzeichnen, führen aber zu einer Glättung der Leistung des gekoppelten Systems. Die Simulation konnte für Siliziumsolarzellen mit einem Demonstratorversuch im Labor und für organische Solarzellen unter realen Bedingungen validiert werden.
Insgesamt ergibt sich eine vielversprechende Glättung der Leistungsfluktuationen von Solarzellen durch den Einsatz von elektrochemischen Doppelschichtkondensatoren.
Objective
To determine whether IgG subclasses of antiparanodal autoantibodies are related to disease course and treatment response in acute- to subacute-onset neuropathies, we retrospectively screened 161 baseline serum/CSF samples and 66 follow-up serum/CSF samples.
Methods
We used ELISA and immunofluorescence assays to detect antiparanodal IgG and their subclasses and titers in serum/CSF of patients with Guillain-Barre syndrome (GBS), recurrent GBS (R-GBS), Miller-Fisher syndrome, and acute- to subacute-onset chronic inflammatory demyelinating polyradiculoneuropathy (A-CIDP). We evaluated clinical data retrospectively.
Results
We detected antiparanodal autoantibodies with a prevalence of 4.3% (7/161), more often in A-CIDP (4/23, 17.4%) compared with GBS (3/114, 2.6%). Longitudinal subclass analysis in the patients with GBS revealed IgG2/3 autoantibodies against Caspr-1 and against anti-contactin-1/Caspr-1, which disappeared at remission. At disease onset, patients with A-CIDP had IgG2/3 anti-Caspr-1 and anti-contactin-1/Caspr-1 or IgG4 anti-contactin-1 antibodies, IgG3 being associated with good response to IV immunoglobulins (IVIg). In the chronic phase of disease, IgG subclass of one patient with A-CIDP switched from IgG3 to IgG4.
Conclusion
Our data (1) confirm and extend previous observations that antiparanodal IgG2/3 but not IgG4 antibodies can occur in acute-onset neuropathies manifesting as monophasic GBS, (2) suggest association of IgG3 to a favorable response to IVIg, and (3) lend support to the hypothesis that in some patients, an IgG subclass switch from IgG3 to IgG4 may be the correlate of a secondary progressive or relapsing course following a GBS-like onset.
Translating basic biological knowledge into applications remains a key issue for effectively tackling neurodegenerative, neuroinflammatory, or neuroendocrine disorders. Efficient delivery of therapeutics across the neuroprotective blood‐brain barrier (BBB) still poses a demanding challenge for drug development targeting central nervous system diseases. Validated in vitro models of the BBB could facilitate effective testing of drug candidates targeting the brain early in the drug discovery process during lead generation. We here review the potential of mono‐ or (isogenic) co‐culture BBB models based on brain capillary endothelial cells (BCECs) derived from human‐induced pluripotent stem cells (hiPSCs), and compare them to several available BBB in vitro models from primary human or non‐human cells and to rodent in vivo models, as well as to classical and widely used barrier models [Caco‐2, parallel artificial membrane permeability assay (PAMPA)]. In particular, we are discussing the features and predictivity of these models and how hiPSC‐derived BBB models could impact future discovery and development of novel CNS‐targeting therapeutics.
Candida lusitaniae is a rare cause of candidemia that is known for its unique capability to rapidly acquire resistance to amphotericin B. We report the case of an adolescent with grade IV graft-vs.-host disease after hematopoietic cell transplantation who developed catheter-associated C. lusitaniae candidemia while on therapeutic doses of liposomal amphotericin B. We review the epidemiology of C. lusitaniae bloodstream infections in adult and pediatric patients, the development of resistance, and its role in breakthrough candidemia. Appropriate species identification, in vitro susceptibility testing, and source control are pivotal to optimal management of C. lusitaniae candidemia. Initial antifungal therapy may consist of an echinocandin and be guided by in vitro susceptibility and clinical response.
Hintergrund: Die Kataraktoperation ist der am meisten durchgeführte operative Eingriff in der Medizin überhaupt. Astigmatismus ist einer der häufigsten Refraktionsfehlern wobei 15-20% der Bevölkerung einen klinisch relevanten Astigmatismus von > 1,5 Dpt zeigen. Im Rahmen der Kataraktoperation besteht die Möglichkeit neben der Linsentrübung auch den Astigmatismus zu korrigieren.
Material und Methoden: 176 Kataraktoperationen mit simultaner Astigmatismuskorrektur wurden retrospektiv untersucht, davon bei 110 Augen durch periphere clear-cornea Relaxationsinzisionen (PCCRI) und bei 66 Augen durch die Implantation von torischen Hinterkammerlinsen (TIOL). Es erfolgte eine topographische und refraktive Astigmatismusanalyse mittels Vektorenanalyse und Doppelwinkeldiagramme.
Ergebnisse: Mittels PCCRI wurde eine topographische Reduktion des Astigmatismus von 0,86 ± 0,63 Dpt sowie eine refraktive Reduktion von 1,33 ± 1,08 Dpt erreicht. Mittels TIOL lag die refraktive Reduktion auf 2,26 ± 1,57 Dpt. Die mittlere Achsenabweichung der TIOL postoperativ lag bei 4,77° ± 4,18°.
Diskussion: Die Implantation von TIOL zeigt eine hohe Effektivität und Sicherheit bzgl. Astigmatismuskorrektur, der PCCRI überlegen. PCCRI ist eine gute, kostengünstige Alternative. Astigmatismusbeträge bis 1,5 Dpt können sowohl durch PCCRI als auch durch TIOL korrigiert werden. Bei höheren Beträgen ist die Implantation von TIOL die Korrektur der ersten Wahl. Eine Revision einer postoperativen Achsenabweichung einer TIOL von > 8° sollte bei klinischer Relevanz in der zweiten postoperativen Woche erwogen werden.
Although decision making strategy based on clinico-histopathological criteria is well established, renal cell carcinoma (RCC) represents a spectrum of biological ecosystems characterized by distinct genetic and molecular alterations, diverse clinical courses and potential specific therapeutic vulnerabilities. Given the plethora of drugs available, the subtype-tailored treatment to RCC subtype holds the potential to improve patient outcome, shrinking treatment-related morbidity and cost. The emerging knowledge of the molecular taxonomy of RCC is evolving, whilst the antiangiogenic and immunotherapy landscape maintains and reinforces their potential. Although several prognostic factors of survival in patients with RCC have been described, no reliable predictive biomarkers of treatment individual sensitivity or resistance have been identified. In this review, we summarize the available evidence able to prompt more precise and individualized patient selection in well-designed clinical trials, covering the unmet need of medical choices in the era of next-generation anti-angiogenesis and immunotherapy.
Das Ziel der vorliegenden Arbeit war es, intervallartige Substrukturen (Melodieintervalle) auf der Melodiekontur von Säuglingslauten im Längsschnitt über die ersten vier Lebensmonate zu analysieren. Melodieintervalle werden als eine Messgröße für die Kurzzeitvariabilität der Grundfrequenz (F0) und damit der laryngealen Regelleistung angesehen. Es sollte belegt werden, dass gesunde Säuglinge Melodieintervalle regelhaft erzeugen. Dabei war auch die Frage zu beantworten, ob Melodien mit Intervallen häufiger vorkommen als Melodien ohne Intervall über den Untersuchungszeitraum der ersten vier Lebensmonate. Neben Häufigkeitsanalysen sollten auch Analysen temporaler Eigenschaften erfolgen und Frequenzratios (Intervallgrößen) ermittelt werden. Langzeitziel dieser Analysen ist es, potenzielle Risikokinder einer späteren Sprech- und Sprachentwicklungsstörung so früh wie möglich anhand einer nicht-invasiven Vorsprachlichen Diagnostik identifizieren zu können.
Aus einem Gesamtdatenkorpus von 6130 Vokalisationen wurden in einer komplexen Vorselektierungs-Routine mittels audio-visueller Analyse insgesamt 3114 Vokalisationen für die finalen Melodieintervallanalysen als geeignet befunden. Unter Methodenmodifikation zu Vorarbeiten, wie einer herabgesetzten Plateaumindestlänge auf 50 ms und unter Einbezug rhythmisch-segmentierter Vokalisationen in die Analysen wurden die Aufnahmen anhand von Melodie- und Intensitätsdiagrammen sowie semi-automatisch zugehörigen Messroutinen im Cry-Data-Analysis-Program (CDAP) analysiert und Melodieintervalle vermessen. Des Weiteren wurden Analysen der Melodiestrukturkategorien, die den Komplexitätsgrad der Konturen reflektieren, und der Bogenformen (Intonation) durchgeführt, um das Auftreten identifizierter Intervallcodes und deren Muster zu diesen in Bezug zu setzen. Das melodische Einzelintervall (Plateau-Übergang-Plateau) wurde als Modul definiert, das zu Doppelintervallen und noch komplexeren Kombinationen unterschiedlicher Codes und Muster zusammengesetzt wird. Das Repertoire dieser Kombinationsmuster wurde in der Arbeit detailliert aufgezeigt. Ein Modul-Vergleich der steigenden und fallenden Einzelintervalle in Einfach- und Doppelbögen konnte eine hohe Übereinstimmung hinsichtlich spezieller Messgrößen, insbesondere der steigenden Intervalle, belegen. Für die über den Untersuchungszeitraum analysierten Auftrittshäufigkeiten der Intervalle konnte mittels einer verallgemeinerten Schätzgleichung (GEE-Model) eine signifikante Zunahme des Intervallauftretens festgestellt werden, die durch einen nichtlinearen Alterseffekt gekennzeichnet war. Die Intervallkomplexität nahm linear signifikant mit dem Lebensalter zu. Es wurden keine Geschlechtseffekte festgestellt. Als vorherrschende Intervallgröße wurde die kleine Sekunde (Halbton) über den Untersuchungszeitraum gefunden. Die Intervallgrößen und ein Großteil der Analysen der temporalen Messgrößen erfolgte auf signalbasierter Ebene und wurde deskriptiv vergleichend zwischen den Richtungen bzw. den Mustern der Intervalle untersucht und als Referenzwerte in umfangreichen Tabellen berichtet. Die Ergebnisse vorliegender Arbeit belegten durch Analysen unterschiedlicher Messgrößen, wie z.B. dem Komplexitätsgrad der Melodie und deren regelrechter Entwicklung mit dem Alter, dass alle hier analysierten Vokalisationen von Probanden stammten, die sich unauffällig entwickelten. Somit wurde sichergestellt, dass die erarbeiteten Referenzwerte für nachfolgende Studien die Verhältnisse bei gesunden Säuglingen widerspiegeln. Die Ergebnisse vorliegender Arbeit sollen als vorläufige Vergleichswerte für geplante Analysen an Vokalisationen von Säuglingen mit orofazialen Spaltbildungen dienen.
Background
For improved outcomes in total knee arthroplasty (TKA) correct implant fitting and positioning are crucial. In order to facilitate a best possible implant fitting and positioning patient-specific systems have been developed. However, whether or not these systems allow for better implant fitting and positioning has yet to be elucidated. For this reason, the aim was to analyse the novel patient-specific cruciate retaining knee replacement system iTotal (TM) CR G2 that utilizes custom-made implants and instruments for its ability to facilitate accurate implant fitting and positioning including correction of the hip-knee-ankle angle (HKA).
Methods
We assessed radiographic results of 106 patients who were treated with the second generation of a patient-specific cruciate retaining knee arthroplasty using iTotal\(^{TM}\) CR G2 (ConforMIS Inc.) for tricompartmental knee osteoarthritis (OA) using custom-made implants and instruments. The implant fit and positioning as well as the correction of the mechanical axis (hip-knee-ankle angle, HKA) and restoration of the joint line were determined using pre- and postoperative radiographic analyses.
Results
On average, HKA was corrected from 174.4 degrees +/- 4.6 degrees preoperatively to 178.8 degrees +/- 2.2 degrees postoperatively and the coronal femoro-tibial angle was adjusted on average 4.4 degrees. The measured preoperative tibial slope was 5.3 degrees +/- 2.2 degrees (mean +/- SD) and the average postoperative tibial slope was 4.7 degrees +/- 1.1 degrees on lateral views. The joint line was well preserved with an average modified Insall-Salvati index of 1.66 +/- 0.16 pre- and 1.67 +/- 0.16 postoperatively. The overall accuracy of fit of implant components was decent with a measured medial overhang of more than 1 mm (1.33 mm +/- 0.32 mm) in 4 cases only. Further, a lateral overhang of more than 1 mm (1.8 mm +/- 0.63) (measured in the anterior-posterior radiographs) was observed in 11 cases, with none of the 106 patients showing femoral notching.
Conclusion
The patient-specific iTotal\(^{TM}\) CR G2 total knee replacement system facilitated a proper fitting and positioning of the implant components. Moreover, a good restoration of the leg axis towards neutral alignment was achieved as planned. Nonetheless, further clinical follow-up studies are necessary to validate our findings and to determine the long-term impact of using this patient- specific system.
Übergewicht, das als Volkskrankheit ein wachsendes globales Problem darstellt, ist mit mehreren folgenreichen Komorbiditäten behaftet und die Assoziation der Erkrankung mit nachweisbarer Schädigung des Erbguts durch oxidativen Stress ist mittlerweile unangefochten. In der vorliegenden Studie wurden periphere Lymphozyten stark bis morbid adipöser Patienten mit Hilfe des Mikrokern-Assays untersucht und es konnte – begleitend zu der zu erwartenden BMI-Abnahme – eine signifikante Reduktion des Genomschadens durch Magenbypass bzw. Sleeve-Gastrektomie 12 Monate postoperativ detektiert werden. Daneben demonstrierte die Analyse zusätzlich erhobener Patientendaten, die u. a. Nüchternglucose, HbA1c, Blutdruck und Herzfrequenz sowie ein Blutbild der Patienten (inklusive CRP als Entzündungsmarker, Transaminasen, gGT sowie Lipidprofil) umfasste, eine deutliche Besserung vieler Parameter bis auf teilweise wieder physiologische Normwerte. All diese Ergebnisse stützen die These der metabolischen Wirksamkeit sowohl des Roux-en-Y-Magenbypass als auch der Sleeve- Gastrektomie. Ihre Bedeutung liegt nicht zuletzt in der angenommenen Reduktion des Krebserkrankungsrisikos, da jeweils ein Zusammenhang mit der Adipositas an sich, dem Diabetes und durch oxidativen Stress verursachter DNA-Schädigung besteht. Mit Blick auf eine gegenwärtig in der Forschung diskutierte potentielle therapeutische Anwendung von Antioxidantien zur Reduktion von Erbgutschädigungen, die durch oxidativen Stress zustande kommen, wurden die Substanzen Tricetinidin, Curcumin und Resveratrol im Rahmen des Mikrokerntests an HL60- und NRK-Zellen untersucht, in denen mit der Mischung aus Insulin und Angiotensin II eine gentoxische Wirkung erzielt worden war.
The clinical picture of depressive disorders is characterized by a plethora of somatic symptoms, psychomotor retardation, and, particularly, anhedonia. The number of patients with residual symptoms or treatment resistance is high. Touch is the basic communication among humans and animals. Its application professionally in the form of, e.g., psychoactive massage therapy, has been shown in the past to reduce the somatic and mental symptoms of depression and anxiety. Here, we investigated the effects of a specially developed affect-regulating massage therapy (ARMT) vs. individual treatment with a standardized relaxation procedure, progressive muscle relaxation (PMR), in 57 outpatients with depression. Patients were given one ARMT or PMR session weekly over 4 weeks. Changes in somatic and cognitive symptoms were assessed by standard psychiatric instruments (Hamilton Depression Scale (HAMD) and the Bech–Rafaelsen–Melancholia–Scale (BRMS)) as well as a visual analogue scale. Furthermore, oral statements from all participants were obtained in semi-structured interviews. The findings show clear and statistically significant superiority of ARMT over PMR. The results might be interpreted within various models. The concept of interoception, as well as the principles of body psychotherapy and phenomenological aspects, offers cues for understanding the mechanisms involved. Within a neurobiological context, the significance of C-tactile afferents activated by special touch techniques and humoral changes such as increased oxytocin levels open additional ways of interpreting our findings.
Kinetics and timing of IL-12 production by dendritic cells for Th1 polarization \(in\) \(vivo\)
(2020)
Dendritic cell (DC) based vaccines rely on the quality of DC maturation to induce antigen presentation, co-stimulation, lymph node migration and the release of heterodimeric IL-12p70 in case of T helper type-1 cell (Th1) polarization. In contrast, DCs that cannot secrete IL-12p70 (e.g. after cytokine cocktail maturation) readily induce Th1 cells when injected into mice and humans. Since it was also previously suggested that DCs are capable of activating other DCs in a bystander fashion, we tested here for the DC source of IL-12p70 for Th1 polarization in a murine DC vaccination model. Migration of the injected murine bone marrow-derived DCs (BM-DCs) was essential for antigen delivery to the lymph node. However, they contributed only partially to antigen presentation, and induced a non-polarized Th0 state of the cognate T cells producing IL-2 but no IFN-. Instead, endogenous dermal migratory XCR1+ cDC1s underwent re-programming by the injected BM-DCs to acquire bystander antigen presentation and IL-12 release for Th1 polarization in the lymph node. Genetic deficiency of migratory DCs and specifically of XCR1+ migratory DCs completely abolished Th1 priming. The kinetic of cell interactions in the draining lymph nodes appeared step-wise as i) injected DCs with cognate T cells, ii) injected DCs with bystander XCR1+ DCs, and iii) bystander XCR1+ DCs with T cells. The transcriptome of the bystander DCs showed a down-regulation of Treg and Th2/Th9 inducing genes, and up-regulation of genes required for Th1 instruction. Together, these data show that injected mature lymph node migratory BM-DCs direct T cell priming and bystander DC activation, but not Th1 polarization which is mediated by endogenous IL-12p70+ XCR1+ migratory bystander DCs. Our results are of importance for clinical DC-based vaccinations against tumors where endogenous DCs may be functionally impaired by chemotherapy.
In Eurotransplant kidney allocation system (ETKAS), candidates can be considered unlimitedly for repeated re‐transplantation. Data on outcome and benefit are indeterminate. We performed a retrospective 15‐year patient and graft outcome data analysis from 1464 recipients of a third or fourth or higher sequential deceased donor renal transplantation (DDRT) from 42 transplant centers. Repeated re‐DDRT recipients were younger (mean 43.0 vs. 50.2 years) compared to first DDRT recipients. They received grafts with more favorable HLA matches (89.0% vs. 84.5%) but thereby no statistically significant improvement of patient and graft outcome was found as comparatively demonstrated in 1st DDRT. In the multivariate modeling accounting for confounding factors, mortality and graft loss after 3rd and ≥4th DDRT (P < 0.001 each) and death with functioning graft (DwFG) after 3rd DDRT (P = 0.001) were higher as compared to 1st DDRT. The incidence of primary nonfunction (PNF) was also significantly higher in re‐DDRT (12.7%) than in 1st DDRT (7.1%; P < 0.001). Facing organ shortage, increasing waiting time, and considerable mortality on dialysis, we question the current policy of repeated re‐DDRT. The data from this survey propose better HLA matching in first DDRT and second DDRT and careful selection of candidates, especially for ≥4th DDRT.
Chlamydia trachomatis is the main cause of sexually transmitted diseases worldwide. As obligate intracellular bacteria Chlamydia replicate in a membrane bound vacuole called inclusion and acquire nutrients for growth and replication from their host cells. However, like all intracellular bacteria, Chlamydia have to prevent eradication by the host's cell autonomous system. The chlamydial deubiquitinase Cdu1 is secreted into the inclusion membrane, facing the host cell cytosol where it deubiquitinates cellular proteins. Here we show that inactivation of Cdu1 causes a growth defect of C. trachomatis in primary cells. Moreover, ubiquitin and several autophagy receptors are recruited to the inclusion membrane of Cdu1‐deficient Chlamydia . Interestingly, the growth defect of cdu1 mutants is not rescued when autophagy is prevented. We find reduced recruitment of Golgi vesicles to the inclusion of Cdu1 mutants indicating that vesicular trafficking is altered in bacteria without active deubiquitinase (DUB). Our work elucidates an important role of Cdu1 in the functional preservation of the chlamydial inclusion surface.
Quantitative Electron Paramagnetic Resonance Studies of Charge Transfer in Organic Semiconductors
(2020)
In the present work we investigated various charge transfer processes, as they appear in the versatile world of organic semiconductors by probing the spin states of the corresponding charge carrier species via electron paramagnetic resonance (EPR) spectroscopy. All studied material systems are carbon-based compounds, either belonging to the group of polymers, fullerenes, or single-wall carbon nanotubes (SWNTs).
In the first instance, we addressed the change of the open circuit voltage (Voc) with the fullerene blend stoichiometry in fullerene-based solar cells for organic photovoltaics (OPV). The voltage depends strongly on the energy separation between the lowest unoccupied molecular orbital (LUMO) of the donor and the highest occupied molecular orbital (HOMO) of the acceptor. By exploiting the Gaussian distribution of the charge carriers in a two-level system, and thus also their spins in the EPR experiment, it could be shown that the LUMOs get closer by a few to a few hundred meV when going from pure fullerene materials to a fullerene mixture. The reason for this strong energetic effect is likely the formation of a fullerene alloy.
Further, we investigated the chemical doping mechanism of SWNTs with a (6,5)-chirality and their behaviour under optical excitation. In order to determine the unintentional (pre)-doping of SWNTs, EPR spectra of the raw material as well as after different purification steps were recorded. This facilitated the determination of nanotube defects and atmospheric p-doping as the causes of the measured EPR signals. In order to deliberately transfer additional charge carriers to the nanotubes, we added the redox-active substance AuCl3 where we determined an associated doping-yield of (1.5±0.2)%. In addition, a statistical occupation model was developed which can be used to simulate the distribution of EPR active, i.e. unpaired and localised charge carriers on the nanotubes.
Finally, we investigated the charge transfer behaviour of (6,5)-SWNTs together with the polymer P3HT and the fullerene PC60BM after optical excitation.
Background: Macrophage Migration Inhibitory Factor (MIF) is highly elevated after cardiac surgery and impacts the postoperative inflammation. The aim of this study was to analyze whether the polymorphisms CATT\(_{5–7}\) (rs5844572/rs3063368,“-794”) and G>C single-nucleotide polymorphism (rs755622,-173) in the MIF gene promoter are related to postoperative outcome. Methods: In 1116 patients undergoing cardiac surgery, the MIF gene polymorphisms were analyzed and serum MIF was measured by ELISA in 100 patients. Results: Patients with at least one extended repeat allele (CATT\(_7\)) had a significantly higher risk of acute kidney injury (AKI) compared to others (23% vs. 13%; OR 2.01 (1.40–2.88), p = 0.0001). Carriers of CATT\(_7\) were also at higher risk of death (1.8% vs. 0.4%; OR 5.12 (0.99–33.14), p = 0.026). The GC genotype was associated with AKI (20% vs. GG/CC:13%, OR 1.71 (1.20–2.43), p = 0.003). Multivariate analyses identified CATT\(_7\) predictive for AKI (OR 2.13 (1.46–3.09), p < 0.001) and death (OR 5.58 (1.29–24.04), p = 0.021). CATT\(_7\) was associated with higher serum MIF before surgery (79.2 vs. 50.4 ng/mL, p = 0.008). Conclusion: The CATT\(_7\) allele associates with a higher risk of AKI and death after cardiac surgery, which might be related to chronically elevated serum MIF. Polymorphisms in the MIF gene may constitute a predisposition for postoperative complications and the assessment may improve risk stratification and therapeutic guidance.
Das Thema dieser Dissertation lautet „Konzeption und Evaluation eines webbasierten Patienteninformationsprogrammes zur Überprüfung internistischer Verdachtsdiagnosen“. Zusammen mit dem Institut für Informatik wurde das wissensbasierte second-opinion-System SymptomCheck entwickelt. Das Programm dient zur Überprüfung von Verdachtsdiagnosen. Es wurden Wissensbasen erstellt, in denen Symptome, Befunde und Untersuchungen nach einem Bewertungsschema beurteilt werden. Folgend wurde eine online erreichbare Startseite erstellt, auf der Nutzer vornehmlich internistische Verdachtsdiagnosen überprüfen können. Das Programm wurde in zwei Studien bezüglich seiner Sensitivität und Spezifität sowie der Benutzerfreundlichkeit getestet. In der ersten Studie wurden die Verdachtsdiagnosen ambulanter Patienten mit den ärztlich gestellten Diagnosen verglichen, eine zweite an die Allgemeinbevölkerung gerichtete Onlinestudie galt vor allem der Bewertung der Benutzerfreundlichkeit. Soweit bekannt ist dies die erste Studie in der ein selbst entwickeltes Programm selbstständig an echten Patienten getestet wurde.
New innovative neuropsychological tests in attention deficit hyperactivity disorder ADHD have been proposed as objective measures for diagnosis and therapy. The current study aims to investigate two different commercial continuous performance tests (CPT) in a head-to-head comparison regarding their comparability and their link with clinical parameters. The CPTs were evaluated in a clinical sample of 29 adult patients presenting in an ADHD outpatient clinic. Correlational analyses were performed between neuropsychological data, clinical rating scales, and a personality-based measure. Though inattention was found to positively correlate between the two tests (r = 0.49, p = 0.01), no association with clinical measures and inattention was found for both tests. While hyperactivity did not correlate between both tests, current ADHD symptoms were positively associated with Nesplora Aquarium's motor activity (r = 0.52 to 0.61, p < 0.05) and the Qb-Test's hyperactivity (r = 0.52 to 0.71, p < 0.05). Conclusively, the overall comparability of the tests was limited and correlation with clinical parameters was low. While our study shows some interesting correlation between clinical symptoms and sub-scales of these tests, usage in clinical practice is not recommended.
Ischemia-like stress conditions stimulate trophic activities of adipose-derived stromal/stem cells
(2020)
Adipose-derived stromal/stem cells (ASCs) have been shown to exert regenerative functions, which are mainly attributed to the secretion of trophic factors. Upon transplantation, ASCs are facing an ischemic environment characterized by oxygen and nutrient deprivation. However, current knowledge on the secretion capacity of ASCs under such conditions is limited. Thus, the present study focused on the secretory function of ASCs under glucose and oxygen deprivation as major components of ischemia. After exposure to glucose/oxygen deprivation, ASCs maintained distinct viability, but the metabolic activity was greatly reduced by glucose limitation. ASCs were able to secrete a broad panel of factors under glucose/oxygen deprivation as revealed by a cytokine antibody array. Quantification of selected factors by ELISA demonstrated that glucose deprivation in combination with hypoxia led to markedly higher secretion levels of the angiogenic and anti-apoptotic factors IL-6, VEGF, and stanniocalcin-1 as compared to the hypoxic condition alone. A conditioned medium of glucose/oxygen-deprived ASCs promoted the viability and tube formation of endothelial cells, and the proliferation and migration of fibroblasts. These findings indicate that ASCs are stimulated by ischemia-like stress conditions to secrete trophic factors and would be able to exert their beneficial function in an ischemic environment.
Aim: Despite increasing interest in β-diversity, that is the spatial and temporal turnover of species, the mechanisms underlying species turnover at different spatial scales are not fully understood, although they likely differ among different functional groups. We investigated the relative importance of dispersal limitations and the environmental filtering caused by vegetation for local, multi-taxa forest communities differing in their dispersal ability, trophic position and body size.
Location: Temperate forests in five regions across Germany.
Methods: In the inter-region analysis, the independent and shared effects of the regional spatial structure (regional species pool), landscape spatial structure (dispersal limitation) and environmental factors on species turnover were quantified with a 1-ha grain across 11 functional groups in up to 495 plots by variation partitioning. In the intra-region analysis, the relative importance of three environmental factors related to vegetation (herb and tree layer composition and forest physiognomy) and spatial structure for species turnover was determined.
Results: In the inter-region analysis, over half of the explained variation in community composition (23% of the total explained 35%) was explained by the shared effects of several factors, indicative of spatially structured environmental filtering. Among the independent effects, environmental factors were the strongest on average over 11 groups, but the importance of landscape spatial structure increased for less dispersive functional groups. In the intra-region analysis, the independent effect of plant species composition had a stronger influence on species turnover than forest physiognomy, but the relative importance of the latter increased with increasing trophic position and body size.
Main conclusions: Our study revealed that the mechanisms structuring assemblage composition are associated with the traits of functional groups. Hence, conservation frameworks targeting biodiversity of multiple groups should cover both environmental and biogeographical gradients. Within regions, forest management can enhance β-diversity particularly by diversifying tree species composition and forest physiognomy.
Purpose
Robotic surgery represents the latest development in the field of minimally invasive surgery and offers many technical advantages. Despite the higher costs, this novel approach has been applied increasingly in gynecological surgery. Regarding the implementation of a new operative method; however, the most important factor to be aware of is patient safety. In this study, we describe our experience in implementing robotic surgery in a German University Hospital focusing on patient safety after 110 procedures.
Methods
We performed a retrospective analysis of 110 consecutive robotic procedures performed in the University Hospital of Würzburg between June 2017 and September 2019. During this time, 37 patients were treated for benign general gynecological conditions, 27 patients for gynecological malignancies, and 46 patients for urogynecological conditions. We evaluated patient safety through standardized assessment of intra- and postoperative complications, which were categorized according to the Clavien–Dindo classification.
Results
No complications were recorded in 90 (81.8%) operations. We observed Clavien–Dindo grade I complications in 8 (7.3%) cases, grade II complications in 5 (4.5%) cases, grade IIIa complications in 1 case (0.9%), and grade IIIb complications in 6 (5.5%) cases. No conversion to laparotomy or blood transfusion was needed.
Conclusion
Robotic surgery could be implemented for complex gynecological operations without relevant problems and was accompanied by low complication rates.
Die spinale Muskelatrophie (SMA) ist eine monogenetische Erkrankung, bei der es durch den Verlust des SMN Proteins zur Degeneration der α-Motoneurone im Rückenmark kommt. Abhängig vom Schweregrad zeigen die Patienten bereits innerhalb der ersten Lebensmonate ausgeprägte Lähmungen der Skelettmuskulatur und eine Zwerchfellparese einhergehend mit einer reduzierten Lebenserwartung. Mithilfe von Mausmodellen für die SMA konnte gezeigt werden, dass der Motoneuronenverlust bei Smn-defizienten Mäusen mit Störungen der Neurotransmission an der motorischen Endplatte und mit Differenzierungsstörungen der Motoneurone einhergeht. Die Differenzierungs-störungen primärer Smn-defizienter Motoneurone sind eng gekoppelt mit einer verminderten Clusterbildung spannungsabhängiger Kalziumkanäle im distalen axonalen Bereich. Dies wiederum führt zu einer verminderten Frequenz spontaner Kalziumeinströme am Axonterminus und hat eine veränderte axonale Elongation zur Folge.
Es wurden folgende Aspekte in Bezug auf die Verstärkung und die Induktion spontaner Kalziumeinströme in Mausmodellen für spinale Muskelatrophien in dieser Arbeit adressiert:
1) Lassen sich spontane Kalziumeinströme in Smn-defizienten Motoneuronen durch die externe Applikation von Kalziumkanalagonisten verstärken?
2) Sind spontane Kalziumeinströme in primären Motoneuronen durch den Brain-derived-neurotrophic-factor (BDNF) induzierbar?
3) Zeigen primäre Motoneurone eines Mausmodells für spinale Muskelatrophie mit Ateminsuffizienz Typ 1 (SMARD1) ebenfalls veränderte Kalziumtransienten?
Die Ergebnisse meiner Arbeit zeigen, dass durch den Kalziumkanalagonisten R-Roscovitine die Frequenz der spontanen Kalziumeinströme im distalen Axon von Smn-defizienten Motoneuronen signifikant erhöht wird. Dies hat wiederum einen regulierenden Effekt auf die Differenzierung der SMA Motoneurone zur Folge. Smn-defiziente Motoneurone zeigen somit keine Unterschiede mehr in Bezug auf Axonlängen und Wachstumskegelflächen im Vergleich zu Kontrollzellen. Für R-
10
Roscovitine ist neben der agonistischen Wirkung am Kalziumkanal auch ein inhibitorischer Effekt auf die Cyclin-abhängige Kinase 5 beschrieben. Es konnte jedoch gezeigt werden, dass die erhöhten Kalziumtransienten unter der Behandlung mit R-Roscovitine durch eine direkte Bindung an die Cav2 Kalziumkanäle verursacht werden und nicht durch eine Cdk5 Blockade. Dafür spricht die schnelle und reversible Wirkung von R-Roscovitine, sowie die Aufhebung des R-Roscovitines Effekts bei gleichzeitiger Gabe des Cav2.2 Antagonisten ω-Conotoxin MVIIC.
Der zweite Aspekt dieser Arbeit behandelt den Einfluss der neurotrophen Faktoren BDNF, CNTF und GDNF auf die Kalziumtransienten am Wachstumskegel wildtypischer Motoneurone. Der Vergleich der neurotrophen Faktoren zeigt, dass nur BDNF eine induzierende Wirkung auf spontane Kalziumtransienten am Wachstumskegel hat.
Der letzte Abschnitt dieser Arbeit beschäftigt sich mit den Kalziumtransienten bei Motoneuronen aus dem Nmd2J (SMARD1) Mausmodell. Die SMARD1 gilt als eigenständige Form der spinalen Muskelatrophien mit unterschiedlicher Genetik und unterschiedlichen klinischen Merkmalen. Die Motoneurone weisen in Bezug auf die Kalziumtransienten keine Unterschiede zwischen Wildtyp und Nmd2J Mutante auf. Es ergibt sich somit kein Hinweis darauf, dass die Degeneration der Motoneurone bei der SMARD1 von einer Störung der Kalziumhomöostase im distalen axonalen Bereich ausgeht.
Comparison of the central human and mouse platelet signaling cascade by systems biological analysis
(2020)
Background
Understanding the molecular mechanisms of platelet activation and aggregation is of high interest for basic and clinical hemostasis and thrombosis research. The central platelet protein interaction network is involved in major responses to exogenous factors. This is defined by systemsbiological pathway analysis as the central regulating signaling cascade of platelets (CC).
Results
The CC is systematically compared here between mouse and human and major differences were found. Genetic differences were analysed comparing orthologous human and mouse genes. We next analyzed different expression levels of mRNAs. Considering 4 mouse and 7 human high-quality proteome data sets, we identified then those major mRNA expression differences (81%) which were supported by proteome data. CC is conserved regarding genetic completeness, but we observed major differences in mRNA and protein levels between both species. Looking at central interactors, human PLCB2, MMP9, BDNF, ITPR3 and SLC25A6 (always Entrez notation) show absence in all murine datasets. CC interactors GNG12, PRKCE and ADCY9 occur only in mice. Looking at the common proteins, TLN1, CALM3, PRKCB, APP, SOD2 and TIMP1 are higher abundant in human, whereas RASGRP2, ITGB2, MYL9, EIF4EBP1, ADAM17, ARRB2, CD9 and ZYX are higher abundant in mouse. Pivotal kinase SRC shows different regulation on mRNA and protein level as well as ADP receptor P2RY12.
Conclusions
Our results highlight species-specific differences in platelet signaling and points of specific fine-tuning in human platelets as well as murine-specific signaling differences.
A water‐soluble tetracationic quadrupolar bis‐triarylborane chromophore showed strong binding to ds‐DNA, ds‐RNA, ss‐RNA, as well as to the naturally most abundant protein, BSA. The novel dye can distinguish between DNA/RNA and BSA by fluorescence emission separated by Δv =3600 cm\(^{-1}\), allowing for the simultaneous quantification of DNA/RNA and protein (BSA) in a mixture. The applicability of such fluorimetric differentiation in vitro was demonstrated, strongly supporting a protein‐like target as a dominant binding site of 1 in cells. Moreover, our dye also bound strongly to ss‐RNA, with the unusual rod‐like structure of the dye, decorated by four positive charges at its termini and having a hydrophobic core, acting as a spindle for wrapping A, C and U ss‐RNAs, but not poly G, the latter preserving its secondary structure. To the best of our knowledge, such unmatched, multifaceted binding activity of a small molecule toward DNA, RNA, and proteins and the selectivity of its fluorimetric and chirooptic response makes the quadrupolar bis‐triarylborane a novel chromophore/fluorophore moiety for biochemical applications.
Transient Receptor Potential (TRP; C-classical; TRPC) Kanäle sind Ionenkanäle in der Plasmamembran und erlauben einen nicht selektiven Ca2+-Einstrom in die Zelle. Durch die Stimulation von Gq-Protein-gekoppelten Rezeptoren (GqPCRs) wird dieser Ca2+-Einstrom erhöht, wodurch über Calmodulin, die Phosphatase Calcineurin aktiviert wird. Der Transkriptionsfaktor nuclear factor of activated T-cells (NFAT) wird durch Calcineurin dephosphoryliert und wandert in den Nucleus, wo er mit anderen Transkriptionsfaktoren interagiert und Hypertrophie-induzierende Gene aktiviert. TRPC3 ist hierbei eine der relevantesten Isoformen für die Entwicklung einer Myokardhypertrophie, wie sie im Rahmen zahlreicher kardiovaskulärer Erkrankungen zu finden ist. Eine kardiale Hypertrophie ist an der Pathogenese der Herzinsuffizienz beteiligt und stellt somit einen wichtigen Risikofaktor für den plötzlichen Herztod dar. Aus diesem Grund ist es von besonderer Bedeutung die Regulation von TRPC3 Kanälen und deren Einfluss auf hypertrophe Prozesse genauer zu untersuchen.
In Vorversuchen wurde FK506 bindendes Protein 52 (FKBP52) als neuer Interaktionspartner von TRPC3 im Herzen gefunden. Die dabei gefundene FKBP52-Bindestelle von TRPC3 lag erstaunlicherweise außerhalb der zu erwartenden Bindestelle mit den vermeintlichen FKBP Bindemotiven.
FKBP52 ist ein Immunophilin, das als cis/trans Isomerase fungiert und dadurch an der Regulation von verschiedenen Ionenkanälen beteiligt ist, darunter auch TRPC-Kanäle. Es zeigte sich, dass alle Domänen von FKBP52, bis auf die TPR3-Domäne und der C Terminus, in der Lage waren, mit TRPC3 zu interagieren. Aufgrund der Funktion der FKBPs und der Tatsache, dass TRPC3 eine Rolle in der Entwicklung einer kardialen Hypertrophie spielt, sollte in dieser Arbeit untersucht werden, ob FKBP52 die Aktivität und die nachgeschalteten hypertrophen Signalwege von TRPC3 beeinflusst.
Die Downregulation von FKBP52 führte zu einer verstärkten TRPC3-abhängigen hypertrophen Antwort in neonatalen Rattenkardiomyozyten (engl. neonatal rat cardiomyocytes, NRCs). Der gleiche Effekt war sowohl in NRCs und in adulten Rattenkardiomyozyten (engl. adult rat cardiomyocytes, ARCs) zu sehen, wenn Peptidyl-Prolyl-cis-trans-Isomerase (PPIase) defiziente Mutanten von FKBP52 überexprimiert wurde. Verkürzte FKBP52 Mutanten erhöhten ebenfalls die TRPC3-abhängige Aktivität von Calcineurin, was durch eine verstärkte Translokation von NFAT in den Nucleus von NRCs zu sehen war. Außerdem konnte in NRCs und in menschlichen embryonalen Nierenzellen (engl. human embryonic kidney cells, HEK 293 Zellen), die die PPIase defizienten Mutanten exprimierten, ein erhöhter Ca2+-Einstrom in die Zelle beobachtet werden. Das gleiche war nach Downregulation von FKBP52 in HEK 293 Zellen, die TRPC3 überexprimieren (T3.9 Zellen), zu sehen. Eine funktionelle Interaktion von FKBP52 und TRPC3 konnte auch in elektrophysiologischen Messungen bestätigt werden. Nach der Interaktion von TRPC3 mit den FKBP52 Mutanten zeigte sich eine erhöhte TRPC3-Aktivität.
Die Daten zeigen somit, dass TRPC3-Kanäle durch FKBP52 reguliert werden und diese Regulation abhängig von der PPIase Funktion ist. Eine Interaktion von TRPC3 mit vollfunktionsfähigem FKBP52 könnte vor einer Ca2+-Überlastung und einer damit einhergehenden pathologischen Hypertrophie des Herzens schützen.
Automated AFM analysis of DNA bending reveals initial lesion sensing strategies of DNA glycosylases
(2020)
Base excision repair is the dominant DNA repair pathway of chemical modifications such as deamination, oxidation, or alkylation of DNA bases, which endanger genome integrity due to their high mutagenic potential. Detection and excision of these base lesions is achieved by DNA glycosylases. To investigate the remarkably high efficiency in target site search and recognition by these enzymes, we applied single molecule atomic force microscopy (AFM) imaging to a range of glycosylases with structurally different target lesions. Using a novel, automated, unbiased, high-throughput analysis approach, we were able to resolve subtly different conformational states of these glycosylases during DNA lesion search. Our results lend support to a model of enhanced lesion search efficiency through initial lesion detection based on altered mechanical properties at lesions. Furthermore, its enhanced sensitivity and easy applicability also to other systems recommend our novel analysis tool for investigations of diverse, fundamental biological interactions.
Staphylococcus aureus is one of the most frequent causes of nosocomial and community‐acquired infections, with drug‐resistant strains being responsible for tens of thousands of deaths per year. S. aureus sortase A inhibitors are designed to interfere with virulence determinants. We have identified disulfanylbenzamides as a new class of potent inhibitors against sortase A that act by covalent modification of the active‐site cysteine. A broad series of derivatives were synthesized to derive structure‐activity relationships (SAR). In vitro and in silico methods allowed the experimentally observed binding affinities and selectivities to be rationalized. The most active compounds were found to have single‐digit micromolar Ki values and caused up to a 66 % reduction of S. aureus fibrinogen attachment at an effective inhibitor concentration of 10 μM. This new molecule class exhibited minimal cytotoxicity, low bacterial growth inhibition and impaired sortase‐mediated adherence of S. aureus cells.
In mehreren Studien wurden Veränderungen des Medikamentenmetabolismus von Psychopharmaka durch entzündliche Prozesse beschrieben. Diese Effekte können zu Therapieversagen oder sogar gravierenderen unerwünschten Arzneimittelwirkungen führen. Aus diesem Grund haben wir untersucht, ob im Laufe inflammatorischer Prozesse eine Veränderung der Medikamentenserumkonzentration der Stimmungsstabilisatoren Valproat (VPA), Lamotrigin (LTG) oder Carbamazepin (CBZ) auftritt.
Der Nutzen von Therapeutischem Drug Monitoring (TDM) bei der Behandlung von HIV-infizierten Kindern in Ländern mit geringen finanziellen Ressourcen ist bisher nicht gründlich erforscht worden. Pharmakokinetische Studien antiretroviraler Medikamente haben bei Kindern eine hohe intra- und interpersonale Varianz gezeigt. Dies könnte den kontinuierlichen Prozessen von Reifung, Wachstum und Körperzusammensetzung geschuldet sein. Deswegen könnte TDM zu einer sichereren und erfolgreicheren Behandlung von HIV bei Kindern in Südafrika beitragen.
Diese Untersuchung einer pädiatrischen HIV-Kohorte zeigte, dass 73,5 % der Patienten innerhalb des empfohlenen therapeutischen Bereichs ihrer Medikamentenkonzentration waren.
Aufgrund einer hohen interpersonalen Varianz antiretroviraler Medikamentenkonzentrationen, eine großen Zahl an Komedikationen mit Interaktionspotential, das Risiko für Non-Adhärenz und Zeichen möglicher Arzneimittelnebenwirkungen, kann TDM die Effizienz und Sicherheit der antiretroviralen Kombinationstherapie von Kindern und Jugendlichen mit HIV verbessern.
Impact of Interparticle Interaction on Thermodynamics of Nano-Channel Transport of Two Species
(2020)
Understanding the function and control of channel transport is of paramount importance for cell physiology and nanotechnology. In particular, if several species are involved, the mechanisms of selectivity, competition, cooperation, pumping, and its modulation need to be understood. What lacks is a rigorous mathematical approach within the framework of stochastic thermodynamics, which explains the impact of interparticle in-channel interactions on the transport properties of the respective species. To achieve this, stochastic channel transport of two species is considered in a model, which different from mean field approaches, explicitly conserves the spatial correlation of the species within the channel by analysis of the stochastic dynamics within a state space, the elements of which are the channel’s spatial occupation states. The interparticle interactions determine the stochastic transitions between these states. Local flow and entropy production in this state space reveal the respective particle flows through the channel and the intensity of the Brownian ratchet like rectifying forces, which these species exert mutually on each other, together with its thermodynamic effectiveness and costs. Perfect coupling of transport of the two species is realized by an attractive empty channel and strong repulsive forces between particles of the same species. This confines the state space to a subspace with circular topology, in which the concentration gradients as thermodynamic driving forces act in series, and channel flow of both species becomes equivalent. For opposing concentration gradients, this makes the species with the stronger gradient the driving, positive entropy producing one; the other is driven and produces negative entropy. Gradients equal in magnitude make all flows vanish, and thermodynamic equilibrium occurs. A differential interparticle interaction with less repulsive forces within particles of one species but maintenance of this interaction for the other species adds a bypass path to this circular subspace. On this path, which is not involved in coupling of the two species, a leak flow of the species with less repulsive interparticle interaction emerges, which is directed parallel to its concentration gradient and, hence, produces positive entropy here. Different from the situation with perfect coupling, appropriate strong opposing concentration gradients may simultaneously parallelize the flow of their respective species, which makes each species produce positive entropy. The rectifying potential of the species with the bypass option is diminished. This implies the existence of a gradient of the other species, above which its flow and gradient are parallel for any gradient of the less coupled species. The opposite holds for the less coupled species. Its flow may always be rectified and turned anti-parallel to its gradient by a sufficiently strong opposing gradient of the other one.
In dieser Arbeit wurde die Herzratenvariabilität (HRV), das Interbeat-Intervall (IBI) sowie die Beziehung zwischen HRV und IBI bei gesunden Probanden, bradykarden Patienten mit einer Mutation im hyperpolarization-activated cyclic nucleotide-gated channel 4-(HCN4) Gen sowie Patienten mit einer Anorexie nervosa (AN) untersucht. Die Haupthypothese lautete, dass die bei Patienten mit AN oft zu beobachtenden Bradykardien durch neurale Mechanismen verursacht werden. Daher wurde angenommen, dass ein Sättigungseffekt der HRV/IBI Beziehung infolge einer anhaltenden parasympathischen Kontrolle des Sinusknotenareals lediglich bei Patienten mit einer AN nachzuweisen ist. In dieser Arbeit konnte ein Sättigungseffekt der HRV/IBI-Beziehung bei Patienten mit einer Anorexia nervosa sowie bei zwei von vier Patienten mit einer HCN4-Mutation nachgewiesen werden. Bei Kontrollen konnten hingegen kaum Zeichen eines Sättigungseffekts der HRV/IBI Beziehung nachgewiesen werden. Es wurde daher geschlussfolgert, dass ein Sättigungseffekt der HRV/IBI Beziehung keine parasympathisch-vermittelte Bradykardie beweist. Es zeigt sich vielmehr, dass die Regulation des HCN4-Gens für die Bradykardie und den festgestellten HRV-Sättigungseffekt bei Patienten mit einer AN verantwortlich sein könnte.
To improve and focus preclinical testing, we combine tumor models based on a decellularized tissue matrix with bioinformatics to stratify tumors according to stage-specific mutations that are linked to central cancer pathways. We generated tissue models with BRAF-mutant colorectal cancer (CRC) cells (HROC24 and HROC87) and compared treatment responses to two-dimensional (2D) cultures and xenografts. As the BRAF inhibitor vemurafenib is—in contrast to melanoma—not effective in CRC, we combined it with the EGFR inhibitor gefitinib. In general, our 3D models showed higher chemoresistance and in contrast to 2D a more active HGFR after gefitinib and combination-therapy. In xenograft models murine HGF could not activate the human HGFR, stressing the importance of the human microenvironment. In order to stratify patient groups for targeted treatment options in CRC, an in silico topology with different stages including mutations and changes in common signaling pathways was developed. We applied the established topology for in silico simulations to predict new therapeutic options for BRAF-mutated CRC patients in advanced stages. Our in silico tool connects genome information with a deeper understanding of tumor engines in clinically relevant signaling networks which goes beyond the consideration of single drivers to improve CRC patient stratification.
Neisseria meningitidis (N. meningitidis) is a human commensal that occasionally causes life-threatening infections such as bacterial meningitis and septicemia. Despite experi-mental evidence that the expression of small non-coding RNAs (sRNAs) as well as the RNA chaperone Hfq affect meningococcal physiology, the impact of RNA-based regula-tion (riboregulation) on fitness and virulence in N. meningitidis is only poorly understood. Therefore, this study addressed these issues using a combination of high-throughput tech-nologies.
A differential RNA-sequencing (dRNA-seq) approach was applied to produce a single-nucleotide resolution map of the primary transcriptome of N. meningitidis strain 8013. The dRNA-seq analysis predicted 1,625 transcriptional start sites including 65 putative sRNAs, of which 20 were further validated by northern blot analysis. By Hfq RNA im-munopreci-pitation sequencing a large Hfq-centered post-transcriptional regulatory net-work comprising 23 sRNAs and 401 potential mRNA targets was identified. Rifampicin stability assays demonstrated that Hfq binding confers enhanced stability on its associat-ed sRNAs. Based on these data, the interactions of two paralogous sRNAs and their cog-nate target mRNA prpB were validated in vivo as well as in vitro. Both sRNAs directly repress prpB encoding a methylisocitrate lyse which was previously shown to be involved in meningococcal colonization of the human nasopharynx.
Besides the well-described RNA chaperone Hfq, FinO-domain proteins have recently been recognized as a widespread family of RNA-binding proteins (RBPs) with regulatory roles in diverse bacteria. They display an intriguing bandwidth of target sites, ranging from a single RNA pair as recognized by plasmid-encoded FinO to the global RNA regu-lons of enterobacterial ProQ proteins. To better understand the intrinsic targeting mode of this RBP family, in vivo targets of the minimal ProQ protein of N. meningitidis were de-termined. In vivo UV crosslinking with RNA deep sequencing (UV-CLIP) identified as-sociations of ProQ with 16 sRNAs and 166 mRNAs encoding a variety of biological functions and thus revealed ProQ as another global RBP in meningococci. It could be shown that meningococcal ProQ predominantly binds to highly structured RNA regions including DNA uptake sequences (DUS) and rho-independent transcription terminators and stabilizes many of its RNA targets as proved by rifampicin stability experiments. As expected from the large suite of ProQ-bound RNAs, proQ deletion globally affects both gene and protein expression in N. meningitidis, changing the expression levels of at least 244 mRNAs and 80 proteins. Phenotypic analyses suggested that ProQ promotes oxida-tive stress tolerance and UV damage repair capacity, both of which are required for full virulence of N. meningitidis.
Together, this work uncovers the co-existence of two major post-transcriptional regulons, one governed by ProQ, the other by Hfq, in N. meningitidis. It further highlights the role of these distinct RBPs and its associated sRNAs to bacterial virulence and indicates that riboregulation is likely to contribute to the way how meningococci adapt to different host niches.
FinO-domain proteins are a widespread family of bacterial RNA-binding proteins with regulatory functions. Their target spectrum ranges from a single RNA pair, in the case of plasmid-encoded FinO, to global RNA regulons, as with enterobacterial ProQ. To assess whether the FinO domain itself is intrinsically selective or promiscuous, we determine in vivo targets of Neisseria meningitidis, which consists of solely a FinO domain. UV-CLIP-seq identifies associations with 16 small non-coding sRNAs and 166 mRNAs. Meningococcal ProQ predominantly binds to highly structured regions and generally acts to stabilize its RNA targets. Loss of ProQ alters transcript levels of >250 genes, demonstrating that this minimal ProQ protein impacts gene expression globally. Phenotypic analyses indicate that ProQ promotes oxidative stress resistance and DNA damage repair. We conclude that FinO domain proteins recognize some abundant type of RNA shape and evolve RNA binding selectivity through acquisition of additional regions that constrain target recognition. FinO-domain proteins are bacterial RNA-binding proteins with a wide range of target specificities. Here, the authors employ UV CLIP-seq and show that minimal ProQ protein of Neisseria meningitidis binds to various small non-coding RNAs and mRNAs involved in virulence.
The aim of this study was to investigate inter-day and -week as well as intra- and inter-individual variation of selected biomarkers in high-performance youth soccer players to assist practitioners interpreting player’s internal load to counteract underperformance and unwanted health risks. Eleven male youth soccer players were tested multiple times during two 3-week periods at midpoint (3-wkmid) and at the end (3-wkend) of the first half of a German under-19 1. Bundesliga season. The levels of creatine kinase (CK), urea, and C-reactive protein (CRP) were measured during 3-wkmid and 3-wkend each Monday, Wednesday, and Friday. In 3-wkmid the CK median was 14% higher (241 vs. 212 U/L) compared to 3-wkend (P = 0.26, ES = 0.16). Overall, the medians of CK, urea (P = 0.59, ES = 0.08), and CRP (P = 0.56, ES = 0.10) during 3-wkmid did not differ to the values of 3-wkend. Daily coefficient of variations (CVs) ranged from 22 to 71% (CK), 17 to 37% (urea), and 9 to 164% (CRP). Individual medians ranged from 101 to 350 U/L (CK), 23 to 50 mg/dL (urea), and 0.6 to 1.1 mg/L (CRP). High intra-individual variability was demonstrated by large intra-individual CVs (medians: CK 50%, urea 18%, and CRP 45%). Our data show (i) large inter-day and inter-week variability of all biomarkers, depending on the external load and (ii) considerable inter- and intra-individual parameter variations. Creatine kinase concentrations could sensitively reflect soccer-specific loads during the season.
Hintergrund
Während eine hochgradige Aortenklappenstenose in vielen Fälle eine
Indikation zum Klappenersatz darstellt, wird bei mittelgradiger
Aortenklappenstenose lediglich eine engmaschige echokardiographische
Kontrolle empfohlen. Es besteht schließlich weitgehender Konsens, dass
diese von Patienten ohne Pumpfunktionsstörung gut kompensiert werden
kann. Unklar bleibt jedoch, ob dies ebenso für Patienten mit LV-Dysfunktion
gilt oder ob diese als eigenständige Kohorte behandelt werden sollten.
Methoden
Insgesamt wurden 67 Patienten des Aortenklappenstenose-Registers im
Universitätsklinikum Würzburg im mittelgradigen Stadium (AÖF 1,1 –
1,5 cm2) mit Erstdiagnose zwischen Mai 2005 und August 2013 und
begleitender systolischer Herzinsuffienz (Mittelwert: Alter 75±8 Jahre, 69%
männlich, EF 38,7±7,7%) retrospektiv analysiert. Diese wurden mit 139
Herzinsuffizienz-Patienten ohne Stenose des DZHI Würzburgs, welche auf
die Parameter Alter, Geschlecht und Ejektionsfraktion gematcht waren,
verglichen (Mittelwert: Alter 74±6 Jahre, 66% männlich, EF 38,9±2,6%).
Ausgeschlossen wurden Patienten mit bikuspider Aortenklappe, Patienten
nach Aortenklappenersatz, Patienten mit anderen höhergradigen Vitien
sowie Patienten mit seltenen, hereditären Kardiomyopathien. Es wurden die
Endpunkte allgemeiner Tod, kardialer Tod und Hospitalisierung wegen
Herzinsuffizienz über einen Beobachtungszeitraum von 3 Jahren untersucht.
Ergebnisse
Während im Kollektiv mit mittelgradiger Aortenklappenstenose (MAKS-Kollektiv)
Hypertonus und Diabetes signifikant häufiger auftraten, hatten im
Vergleichskollektiv deutlich mehr Patienten eine positive Raucheranamnese
und einen Herzinfarkt durchgemacht. Waren im MAKS-Kollektiv Patienten
aus allen NYHA-Klassen gleichmäßig vertreten, so waren im
Vergleichskollektiv vor allem Patienten der NYHA-Klasse II und III
repräsentiert. Hinsichtlich echokardiographischer Messwerte zeigten MAKS-Patienten
zum Baseline-Zeitpunkt in den diastolischen Parametern E/E’-
Verhältnis (18,6±7 vs. 13,7±11, p=0,01) und Dezelerationszeit (232±105 ms
vs. 197±79 ms, p=0,025) schlechtere Werte und hatten häufiger
Vorhofflimmern (37% vs. 22%, p=0,023).
Im Beobachtungszeitraum von 3 Jahren starben 25 (37%) im MAKSKollektiv
vs. 36 (26%) Patienten im Vergleichskollektiv (p=0,075) an
allgemeinen Todesursachen sowie 14 (21%) vs. 15 (11%) Patienten an
kardiovaskulären Ursachen (p=0,035) wohingegen 17 (25%) vs. 43 (31%)
Patienten wegen Herzinsuffizienz hospitalisiert wurden (p=0,57). Im
Stenose-Kollektiv wurden 4 Klappenersatz-Operationen durchgeführt.
In der Cox-Regression zeigte sich das Alter als derart starker Prädiktor, dass
nach Adjustierung auf Alter und Geschlecht der Einfluss der mittelgradigen
Aortenklappenstenose hinsichtlich allgemeinem Tod [HR 1,59 (0,94-2,68),
p=0,085] und kardiovaskulärem Tod [HR 1,73 (0,81-3,68), p=0,157] das
Signifikanzniveau nicht erreichte.
Schlussfolgerung
Zusammenfassend lässt sich anhand dieser Daten sagen, dass Patienten
mit mittelgradiger Aortenklappenstenose und gleichzeitig bestehender LV-Dysfunktion
ein tendenziell schlechteres Outcome im Vergleich zu Patienten
ohne Aortenklappenstenose haben, wohingegen sich ihre Hospitalisierungsrate
nicht unterscheidet.
The honeybee is a well studied and important organism in neuroethology. The possibility to train them with a classical conditioning paradigm and their miniature brain provide a perfect requisite to investigate the neuronal principles of learning and memory. Honeybees use visual and olfactory cues to detect flowers during their foraging trips. Hence, the reward association of a nectar source is a multi-modal construct, which has at least two major components - olfactory and visual cues. It is still an open question, how both sensory components are converged in the mushroom body, which represent the multi-modal integration centre of the honeybee brain. The main goal of this study, is to investigate the processing of multiple modalities and how a reward association is formed. This includes, how and wether both sensory modalities interfere during learning. Thus, in this study stimulation with UV, blue and green light was used to evoke distinct photoreceptor activities in the compound eye. Furthermore, three different odours (Geraniol, Citronellol and Farnesol) were used. These stimuli were tested in three different experimental series. The first experiment involved classical differential conditioning of the single modalities - odour and colour. Honeybees showed high learning performances in differentiating olfactory stimuli and also reliable responses for visual conditioning. Furthermore, a temporal discrepancy in the stimulus length for best learning in the olfatcoty and visual cues was found. In the second series, it was tested how multi-modal compounds are perceived. This includes, unique cues (configural processing) or the sum of the single components of a compound (elemen- tal processing). This was tested by combining single odour components with monochromatic light in a positive (PP) and negative patterning (NP) experiment. During PP, the olfactory- visual compound was rewarded, whereas the single components were unrewarded. In contrast, during NP the single components were reinforced, but the compound was not. In addition, the ability to distinguish between two different light stimuli presented as a part of an olfactory-visual compound with the same odour component during acquisition was tested. In a memory test, the light stimuli were presented again as a compound and in addition as the single components. The results revealed that bees used elemental processing with compounds containing green and blue light. In contrast, when UV light was presented the bees used configural processing. Finally, a third experiment was conducted at the neuronal level. Multi-unit recordings were established to provide a suitable method to analyse extrinsic neurons at the mushroom body output region, the so called ventral lobe of the pedunculus. Here, three different odours (Geran- iol, Farnesol and Citronellol), two colours (green and blue) and two combined stimuli (colour + odour) were chosen as stimuli, to search for possible variations in processing stimuli with different modalities. Two units could be detected that responded mainly to visual stimuli.
The fruit fly Drosophila melanogaster is an established model organism in chronobiology, because genetic manipulation and breeding in the laboratory are easy. The circadian clock neuroanatomy in D. melanogaster is one of the best-known clock networks in insects and basic circadian behavior has been characterized in detail in this insect. Another model in chronobiology is the honey bee Apis mellifera, of which diurnal foraging behavior has been described already in the early twentieth century. A. mellifera hallmarks the research on the interplay between the clock and sociality and complex behaviors like sun compass navigation and time-place-learning. Nevertheless, there are aspects of clock structure and function, like for example the role of the clock in photoperiodism and diapause, which can be only insufficiently investigated in these two models. Unlike high-latitude flies such as Chymomyza costata or D. ezoana, cosmopolitan D. melanogaster flies do not display a photoperiodic diapause. Similarly, A. mellifera bees do not go into “real” diapause, but most solitary bee species exhibit an obligatory diapause. Furthermore, sociality evolved in different Hymenoptera independently, wherefore it might be misleading to study the social clock only in one social insect. Consequently, additional research on non-model insects is required to understand the circadian clock in Diptera and Hymenoptera. In this review, we introduce the two chronobiology model insects D. melanogaster and A. mellifera, compare them with other insects and show their advantages and limitations as general models for insect circadian clocks.
Post-embryonic Development of the Circadian Clock Seems to Correlate With Social Life Style in Bees
(2020)
Social life style can influence many aspects of an animal’s daily life, but it has not yet been clarified, whether development of the circadian clock in social and solitary living bees differs. In a comparative study, with the social honey bee, Apis mellifera, and the solitary mason bee, Osmia bicornis, we now found indications for a differentially timed clock development in social and solitary bees. Newly emerged solitary bees showed rhythmic locomotion right away and the number of neurons in the brain that produce the clock component pigment-dispersing factor (PDF) did not change during aging of the adult solitary bee. Honey bees on the other hand, showed no circadian locomotion directly after emergence and the neuronal clock network continued to grow after emergence. Social bees appear to emerge at an early developmental stage at which the circadian clock is still immature, but bees are already able to fulfill in-hive tasks.
The contribution of this dissertation is to empirically analyze the link between income distribution, sectoral financial balances, and the current account. Firstly, it examines the relationship between the personal and the functional income distribution which may have rather different implications for aggregate demand and the current account. Secondly, it analyzes the importance of different sectors of the economy for current account balances and tests whether households are able to fully pierce the institutional veils of the corporate and the government sector. Thirdly, it investigates how changes in the personal and the functional income distribution affect the saving and investment decisions of the household and the corporate sector, and hence the current account. Finally, it shows how different growth regimes are linked to different patterns of personal and functional income distribution, and how differences in wage bargaining institutions contribute to explaining these different patterns of income distribution.
MicroRNA-221 (miR-221) führt in Prostatakarzinomzellen zu einer Induktion einer TRAIL-supprotiven Signatur als Folge einer Interferonaktivierung mit Heraufregulation von STAT-1 und den TRAIL-relevanten, interferonsensitiven Genen TNFSF-10 und XAF-1. Ferner führt die Inhibierung des bekannten Zielgenes SOCS-3 sowie die Inhibierung des neu beschriebenen Zielgenens PIK3R1 zu einer TRAIL-Sensitivierung in den untersuchten Prostatakarzinomzellen.
Der genetische Code beschreibt die Ver- und Entschlüsselung der Erb-information für das universelle Prinzip der Proteinbiosynthese aus einzelnen Aminosäuren. Durch Erweiterung des genetischen Codes lassen sich unna-türliche Aminosäuren (uAA) mit einzigartigen biophysikalischen Eigenschaf-ten ortsspezifisch in Proteine einführen und ermöglichen die spezifische Ma-nipulation von Proteinen.
Die Click-Reaktion zwischen der unnatürlichen Aminosäure TCO*-Lysin und Tetrazin besitzt eine außergewöhnliche Reaktionskinetik (≥800 M-1s-1) und ermöglicht eine spezifische und bioorthogonale Markierung von Bio-
¬molekülen unter physiologischen Bedingungen.
Im Fokus dieser Arbeit stand zunächst die Markierung von Membran-
¬rezeptoren durch Click-Chemie in lebenden Zellen sowie die Untersuchung der Wechselwirkung 22 bekannter und neuartiger Tetrazin-Farbstoff-
Konjugate. Darüber hinaus wurde die Anwendbarkeit von bioorthogonalen Click-Reaktionen für die hochauflösende Fluoreszenzmikroskopie untersucht. Durch Erweiterung des genetischen Codes in Proteine aus der Klasse der ionotropen Glutamatrezeptoren (iGluR), TNF-Rezeptoren oder Mikrotubu-li-assoziierten Proteinen (MAP) wurde ortspezifisch die unnatürliche Amino-säure TCO*-Lysin eingeführt und dadurch die Fluoreszenzmarkierung durch Tetrazin-Farbstoffe ermöglicht. Die direkte chemische Kopplung von TCO an Liganden wie Phalloidin und Docetaxel, welche spezifisch das Aktin-Zytoskelett bzw. Mikrotubuli-Filamente binden können, ermöglichte zudem die Click-Färbungen von fixierten und lebenden Zellen ohne genetische Ver-änderungen der Zielproteine.
Des Weiteren wurden die spektroskopischen Eigenschaften von 22 Tetrazin-Farbstoffen, verteilt über den gesamten sichtbaren Wellenlängenbereich, untersucht. Ein charakteristisches Kennzeichen der Click-Reaktion mit Tet-razin-Farbstoffen ist dabei ihre Fluorogenität. Das Tetrazin fungiert nicht nur als reaktive Gruppe während der Click-Reaktion mit Alkenen, sondern führt in vielen Tetrazin-Farbstoff-Konjugaten zur Fluoreszenzlöschung. Während bei grün-absorbierenden Farbstoffe vor allem FRET-basierte Löschprozesse dominieren, konnte photoinduzierter Elektronentransfer (PET) vom angeregten Farbstoff zum Tetrazin als Hauptlöschmechanismus bei rot-absorbierenden Oxazin- und Rhodamin-Derivaten identifiziert
werden.
Die effiziente und spezifische Markierung aller untersuchten Tetrazin-
Farbstoffe ermöglichte die Visualisierung von Aktin-Filamenten, Mikrotubuli und Membranrezeptoren sowohl durch konventionelle Fluoreszenzmikrosko-pie als auch durch hochauflösende Verfahren, wie z.B. dSTORM, auf Ein-zelmolekülebene. Die unterschiedliche Zellpermeabilität von
Tetrazin-Farbstoffen kann dabei vorteilhaft für die spezifische intra- und extrazelluläre Markierung von Proteinen in fixierten und lebenden Zellen genutzt werden.
In der vorliegenden Arbeit wird der Einfluss von Metallkomplexverbindungen auf der Basis von monotopen und ditopen Terpyridin-Liganden auf Zellen behandelt. Es können mehrere Möglichkeiten aufgezeigt werden, wie MEPE als kontrollierte Freisetzungssysteme für Zel-lanwendungen eingesetzt werden können. Es werden 2D-Beschichtungen, 3D-Knochenzemente und Terpyridin funktionalisierte Alginate hergestellt. Es ist möglich, definier-te, homogene Fe-MEPE Schichten auf Borosilikatglas mithilfe der Layer by Layer Technik und mittels Tauschbeschichtung abzuscheiden. Um die Oberfläche und somit die Freisetzung von Metallionen zu erhöhen, werden zusätzlich poröse SiO2-Schichten hergestellt, welche mit Fe-MEPE infiltriert werden. Um die Anwendbarkeit von Metallkomplexverbindungen auf der Basis von monotopen und ditopen Terpyridin-Liganden als Knochenersatzmaterial zu testen werden Hydroxylapatit Knochenzemente synthetisiert. Ziel ist eine retardierende Freisetzung der Metallionen ohne Burst Effekt und ohne den Verlust der Druckstabilitäten der HA Zemen-te. Die Funktionalisierung von Alginat mit 1-Amino-5-(2,2ʹ:6ʹ,2ʹʹ-terpyrid-4ʹ-yl-oxy)pentan resultiert in Hydrogelen, welche ein anderes Gelierverhalten als das unfunktionalisierte Alginat zeigen. Zudem ist es möglich mit Fe(II)- /Ca(II)-Salzmischungen Hydrogele auszubilden. Die funktionalisierten Alginate sind zudem bioaktiv.
Zum grundlegenden Verständnis der MEPE Zell Wechselwirkung werden zunächst Zytotoxo-zitätsuntersuchungen mittels WST-1 Test von L929 und C2C12-Zellen mit wässrigen M(II)MEPE Lösungen (Metallionen M= Fe(II), Co(II), Ni(II), Zn(II)) in einem Konzentrationsbe-reich von 1,56x10-11 bis 1,6x10-5 mol L-1 durchgeführt. Fe-MEPE zeigt im betrachteten Kon-zentrationsbereich keine zytotoxischen Eigenschaften auf die eingesetzte Fibroblastenzelllinie. Bei Konzentrationen über 1x10-6 mol L-1 Fe-MEPE sinkt die Mitochondrienaktivität der C2C12-Zellen auf 40%. Dagegen wirken Co- und Zn-MEPE ab einer Konzentration von 1x10-7 mol L-1 stark zytotoxisch auf L929 und C2C12-Zellen.
Um selektiv die Differenzierung von C2C12, MG63, humanen mesenchymalen Stammzellen (hMSCs) und humanen Endothelzellen anzuregen, werden die Zellen auf den hergestellten 2D Beschichtungen ausgesät. Es kann gezeigt werden, dass Fe-MEPE die Proliferation zu-gunsten der Stoffwechselaktivität von C2C12, MG63-Zellen und hMSCs hemmt. Bei weiterer Betrachtung der spezifischen myogenen Differenzierungsmarker der C2C12-Zellen bzw. der spezifischen Gene der osteogenen Differenzierung (Osteocalcin und ALP) mithilfe qRT-PCR können erhebliche Stimulierungen auf der mRNA Basis detektiert werden. Auch auf
enzymatischer Ebene zeigen Fe-MEPE modifizierte Oberflächen einen stimulierenden Effekt auf die Aktivität der alkalischen Phosphatase der MG63 Zelllinie und humaner mesenchyma-ler Stammzellen.
Somit kann eine Stimulierung der myogenen Differenzierung von C2C12-Zellen, sowie oste-ogenen Differenzierung von MG63-Zellen und hMSCs mittels Fe-MEPE beschichteten Ober-flächen innerhalb von drei Tagen nachgewiesen werden. Die Ergebnisse zeigen, dass Fe-MEPE funktionalisierte Oberflächen als innovative Scaffolds für die Behandlung von Kno-chendefekten eingesetzt werden können.
Lymphoid aggregates in the CNS of progressive multiple sclerosis patients lack regulatory T cells
(2020)
In gray matter pathology of multiple sclerosis, neurodegeneration associates with a high degree of meningeal inflammatory activity. Importantly, ectopic lymphoid follicles (eLFs) were identified at the inflamed meninges of patients with progressive multiple sclerosis. Besides T lymphocytes, they comprise B cells and might elicit germinal center (GC)-like reactions. GC reactions are controlled by FOXP3+ T-follicular regulatory cells (TFR), but it is unknown if they participate in autoantibody production in eLFs. Receiving human post-mortem material, gathered from autopsies of progressive multiple sclerosis patients, indeed, distinct inflammatory infiltrates enriched with B cells could be detected in perivascular areas and deep sulci. CD35+ cells, parafollicular CD138+ plasma cells, and abundant expression of the homing receptor for GCs, CXCR5, on lymphocytes defined some of them as eLFs. However, they resembled GCs only in varying extent, as T cells did not express PD-1, only few cells were positive for the key transcriptional regulator BCL-6 and ongoing proliferation, whereas a substantial number of T cells expressed high NFATc1 like GC-follicular T cells. Then again, predominant cytoplasmic NFATc1 and an enrichment with CD3+CD27+ memory and CD4+CD69+ tissue-resident cells implied a chronic state, very much in line with PD-1 and BCL-6 downregulation. Intriguingly, FOXP3+ cells were almost absent in the whole brain sections and CD3+FOXP3+ TFRs were never found in the lymphoid aggregates. This also points to less controlled humoral immune responses in those lymphoid aggregates possibly enabling the occurrence of CNS-specific autoantibodies in multiple sclerosis patients.
Parkinson Patienten sind im Gegensatz zu gesunden Probanden in der kognitiven Verarbeitung zeitlicher Parameter, im Sinne einer Diskriminierungsfähigkeit für zeitliche Fehler innerhalb der Musikwahrnehmung beeinträchtigt. Dies betrifft lediglich die Zeiterkennung in höheren Intervallbereichen (> 600ms) und ist am ehesten durch Fluktuationen der Aufmerksamkeit, des Gedächtnisses, aber auch im Vergleich zu anderen Studien durch methodische Ansätze zu erklären. Durch die Koppelung des Audiostimulus an klare Rhythmusstrukturen weist diese Studie jedoch darauf hin, dass Überschneidungen zu anderen neuronalen Netzwerken existieren, die zur Kompensationsstrategie rekrutiert und nutzbar gemacht werden können. Dazu gehören etwa die Verarbeitung zeitlicher (Cerebellum) und musikperzeptiver Leistungen, wie etwa die Verarbeitung musikalischer Syntax (BA 6, 22, 44). Etwaige Wahrnehmungsdefizite können durch Mechanismen musiksyntaktischer Verarbeitung kompensiert werden, da zeitliche und syntaktische Strukturen in der Musik auf ihre Kongruenz hin abgeglichen und somit multineuronal mediiert werden (Paradigma der Zeit-Syntax-Kongruenz in der Musikwahrnehmung). Weiterhin sind vermutlich top-down-bottom-up-Prozesse als multimodale Interaktionen an diesem Kompensationsmechanismus beteiligt. Außerdem ist festzuhalten, dass das Krankheitsstadium nicht zwangsläufig mit einem stärkeren Wahrnehmungsdefizit für zeitliche Strukturen einhergehen muss, obwohl – wenn auch noch tolerabel – mit Progression der Erkrankung dieses Kompensationsmodell über Prinzipien der Gestaltwahrnehmung zusammenbricht und es hier zu schlechteren perzeptiven Leistungen kommen kann.
Die Ergebnisse der OFF-Testungen und jener unter DBS-Therapie lassen weiterhin aufgrund der kleinen Stichprobe keine klare Aussage zu und machen weitere Untersuchungen notwendig. Das physiologische Alter korreliert außerdem mit der sensorischen Leistung, die allerdings starken, individuellen Unterschieden ausgesetzt ist und von multifaktoriellen Voraussetzungen abhängt. Auch zeigt die Studie, dass Menschen mit einem hohen Musikverständnis und einer musikalischen Ausbildung ein feineres Diskriminierungsvermögen in der zeitlichen Verarbeitung besitzen, welches v.a. im zeitlich niedrigen Intervallbereich (< 500ms) evident wird.
RTX-Toxins
(2020)
Krebserkrankungen stellen eine lebensverändernde und potentiell letale Diagnose dar. Orale Zytostatika stellen eine vielversprechende Therapiemöglichkeit dar. Ein häufig eingesetztes orales Zytostatikum ist Capecitabin. Durch den Einsatz von oralen Chemotherapeutika ergeben sich viele Vorteile. Grundlegende Voraussetzung für den Einsatz der Tablettenform ist allerdings eine äquivalente Wirksamkeit. Diese hängt entscheidend von ausreichender Adhärenz der Patienten ab.
In dieser Studie konnte bei der Auswertung des MARS-D gezeigt werden, dass 25 % der Studienteilnehmer nicht ausreichend adhärent waren. Häufigster Grund für Nicht-Adhärenz war das Vergessen der Medikamenteneinnahme. Ein weiteres, wichtiges Ergebnis dieser Pilotstudie war, dass die Probanden ihre Adhärenz subjektiv deutlich höher einschätzten (M im VAS 97,72) als sich bei der Auswertung des MARS-D bestätigen ließ.
Die Erkennung und Behandlung psychischer Beeinträchtigungen und Erkrankungen ist bei der Betreuung von Krebspatienten entscheidend. Fear of progression (FOP) ist die am häufigsten geäußerte Angst von Krebspatienten. Diese Studie konnte die Bedeutung von FOP deutlich zeigen: bei 38 % der Probanden konnte eine dysfunktionale Form der FOP nachgewiesen werden. Nur vier Studienteilnehmer nutzten allerdings psychosomatische/psychiatrische Unterstützungmöglichkeiten.
Die Single-Item Analyse des PA-F-KF zeigten sich Ängste im Vordergrund stehend, welche den Bereich Familie betrafen. Überraschenderweise ließ sich zwischen der häufigsten Nebenwirkung Hand-Fuß-Syndrom und FOP kein signifikanter Zusammenhang nachweisen. Dagegen konnten stark signifikante Zusammenhänge zwischen dem Auftreten von Diarrhoen, Übelkeit, Erschöpfung und dysfunktionaler FOP gezeigt werden.
The fine-tuning of glucose uptake mechanisms is rendered by various glucose transporters with distinct transportcharacteristics. In the pancreatic islet, facilitative diffusion glucose transporters (GLUTs), and sodium-glucosecotransporters (SGLTs) contribute to glucose uptake and represent important components in the glucose-stimulatedhormone release from endocrine cells, therefore playing a crucial role in blood glucose homeostasis. This reviewsummarizes the current knowledge aboutcell type-specific expression profiles as well as proven and putative functionsof distinct GLUT and SGLT family members in the human and rodent pancreatic islet and further discusses their possibleinvolvement in onset and progression ofdiabetes mellitus. In context of GLUTs, we focus on GLUT2, characterizing themain glucose transporter in insulin-secretingβ-cells in rodents. In addition, we discuss recent data proposing that otherGLUT family members, namely GLUT1 and GLUT3, render this task in humans. Finally, we summarize latest infor-mation about SGLT1 and SGLT2 as representatives of the SGLT family that have been reported to be expressed predominantly in the α-cell population with a suggested functional role in the regulation of glucagon release
In der Plastischen Chirurgie erfordert die Rekonstruktion von ästhetisch anspruchsvollen Bereichen in vielen Fällen die Wiederherstellung von subkutanem Fettgewebe. Neben chirurgischen Rekonstruktionen könnte das Tissue Engineering von Fettgewebe einen wertvollen Beitrag leisten. Jedoch bringt es vielschichtige Herausforderungen mit sich und ist zum aktuellen Zeitpunkt nur limitiert möglich. Ein Ansatz ist die Schaffung einer Trägermatrix zur Besiedelung und Differenzierung von Stammzellen. Auf dieser Basis sollten in der vorliegenden Arbeit zwei Teilbereiche untersucht werden. In dem ersten Teilbereich erfolgten Untersuchungen verschiedener Gewinnungsmethoden von ASCs aus dem subkutanen Fettgewebe bezogen auf ihr Effizienz. Die untersuchten Liposuktionstechniken zeigten eine deutlich höhere Effizienz gegenüber der mechanischen Gewinnungsmethode bezogen auf die gewonnene Zellzahl. In den Viabilitätsuntersuchungen zeigte sich eine ähnliche Tendenz. ASCs aller drei Gewinnungsmethoden proliferierten durchaus gleich gut, jedoch zeigten die histologischen und quantitativen Adipogeneseuntersuchungen tendenziell mehr Lipidbildung bei den Liposuktionstechniken.
Das übergeordnete Ziel des zweiten Abschnittes dieser Arbeit war es eine Trägermatrix auf Hyaluronsäure-Basis mit dem vielseitig modifizierbarem Crosslinker Polyglycidol zu untersuchen, sie mit mesenchymalen Stammzellen aus dem Fettgewebe zu besiedeln und diese adipogen zu differenzieren. Des Weiteren erfolgten erste Versuche die Hydrogele mit funktionellen Gruppen zu modifizieren um eine Verbesserung der Adhäsion der Zellen im Hydrogel zu erreichen. Die unmodifizierten Hydrogele waren zu jeder Zeit stabil in ihrer Form und zeigten nach Besiedelung mit ASCs eine gleichmäßige Verteilung der Zellen im Gel. Auch ließ sich die Adipogenese histologisch visualisieren und biochemisch bestätigen. Die inkorporierten Peptide brachten eine peptidabhängige und konzentrationsabhängige Veränderung der Zellverteilung im Hydrogel. Eine Steigerung der Funktionalität der Zellen bezogen auf das Überleben und die Adipogenese konnte in diesen ersten Versuchen noch nicht gezeigt werden.
Generell zeigt sich eine Eignung der hyaluronsäurebasierten mit Polyglycidol-verlinkten Hydrogele für das Tissue Engineering von Fettgewebe. Weitere Untersuchungen bezüglich der Modifikation der Hydrogele mit adhäsiven und adipogenen funktionellen Gruppen bietet sich daher an und könnte ein fettgewebsähnliches Umgebungsmilieu hervorbringen.
Comparative analysis of insect circadian clocks: a behavioural, anatomical, and molecular study
(2020)
Biological clocks are endogenous oscillators that give organisms the sense of time. Insects, as the largest taxonomic group, offer fascinating models to study the evolution of clocks and their adaptation to various environments. Although the laboratory fruit fly, Drosophila melanogaster, led the role in the field of circadian biology as it provides a powerful genetic experimental tool, new model insect species need to be established to understand photoperiodic responses and to enable comparative studies. This work reports the behavioural, anatomical, and molecular characterization of the circadian clock of five insect species. The malt fly Chymomyza costata carries a D. melanogaster-like clock network, which supports circadian rhythms under rhythmic environment but cannot self-sustain when isolated from external time cues. The olive fly Bactrocera oleae is the major pest of olive plantations and the characterization of its circadian clock will improve future pest management strategies. The linden bug Pyrrhocoris apterus, a well suited model for investigating circadian and photoperiodic timing interactions, shows high degree of homology of the clock network with D. melanogaster. The scuttle flies Megaselia scalaris and Megaselia abdita represent new fascinating models to study how the clock network controls circadian behaviour. Overall, this work highlights high degree of homology between different circadian clock systems, but at the same time also dramatic differences in terms of circadian behaviour and neuro-anatomical expression of clock components. These have been mainly discussed in regards to the evolution of clocks in Diptera, and the adaptation of clocks to high latitudes.
Background
The neuronal ceroid lipofuscinoses (CLN diseases) are fatal lysosomal storage diseases causing neurodegeneration in the CNS. We have previously shown that neuroinflammation comprising innate and adaptive immune reactions drives axonal damage and neuron loss in the CNS of palmitoyl protein thioesterase 1-deficient (Ppt1\(^{-/-}\)) mice, a model of the infantile form of the diseases (CLN1). Therefore, we here explore whether pharmacological targeting of innate immune cells modifies disease outcome in CLN1 mice.
Methods
We applied treatment with PLX3397 (150 ppm in the chow), a potent inhibitor of the colony stimulating factor-1 receptor (CSF-1R) to target innate immune cells in CLN1 mice. Experimental long-term treatment was non-invasively monitored by longitudinal optical coherence tomography and rotarod analysis, as well as analysis of visual acuity, myoclonic jerks, and survival. Treatment effects regarding neuroinflammation, neural damage, and neurodegeneration were subsequently analyzed by histology and immunohistochemistry.
Results
We show that PLX3397 treatment attenuates neuroinflammation in CLN1 mice by depleting pro-inflammatory microglia/macrophages. This leads to a reduction of T lymphocyte recruitment, an amelioration of axon damage and neuron loss in the retinotectal system, as well as reduced thinning of the inner retina and total brain atrophy. Accordingly, long-term treatment with the inhibitor also ameliorates clinical outcomes in CLN1 mice, such as impaired motor coordination, visual acuity, and myoclonic jerks. However, we detected a sex- and region-biased efficacy of CSF-1R inhibition, with male microglia/macrophages showing higher responsiveness toward depletion, especially in the gray matter of the CNS. This results in a better treatment outcome in male Ppt1\(^{-/-}\) mice regarding some histopathological and clinical readouts and reflects heterogeneity of innate immune reactions in the diseased CNS.
Conclusions
Our results demonstrate a detrimental impact of innate immune reactions in the CNS of CLN1 mice. These findings provide insights into CLN pathogenesis and may guide in the design of immunomodulatory treatment strategies.
Apart from dedicated oligodendroglial progenitor cells, adult neural stem cells (aNSCs) can also give rise to new oligodendrocytes in the adult central nervous system (CNS). This process mainly confers myelinating glial cell replacement in pathological situations and can hence contribute to glial heterogeneity. Our previous studies demonstrated that the p57kip2 gene encodes an intrinsic regulator of glial fate acquisition and we here investigated to what degree its modulation can affect stem cell‐dependent oligodendrogenesis in different CNS environments. We therefore transplanted p57kip2 knockdown aNSCs into white and gray matter (WM and GM) regions of the mouse brain, into uninjured spinal cords as well as in the vicinity of spinal cord injuries and evaluated integration and differentiation in vivo. Our experiments revealed that under healthy conditions intrinsic suppression of p57kip2 as well as WM localization promote differentiation toward myelinating oligodendrocytes at the expense of astrocyte generation. Moreover, p57kip2 knockdown conferred a strong benefit on cell survival augmenting net oligodendrocyte generation. In the vicinity of hemisectioned spinal cords, the gene knockdown led to a similar induction of oligodendroglial features; however, newly generated oligodendrocytes appeared to suffer more from the hostile environment. This study contributes to our understanding of mechanisms of adult oligodendrogenesis and glial heterogeneity and further reveals critical factors when considering aNSC mediated cell replacement in injury and disease.
Although heart failure following myocardial infarction (MI) represents a major health burden, underlying microstructural and functional changes remain incompletely understood. Here, we report on a case of unexpected MI after treatment with the catecholamine isoproterenol in an experimental imaging study in mice using different state-of-the-art imaging modalities. The decline in cardiac function was documented by ultrahigh-frequency echocardiography and speckle-tracking analyses. Myocardial microstructure was studied ex vivo at a spatial resolution of 100 × 100 × 100 μm\(^{3}\) using diffusion tensor magnetic resonance imaging (DT-MRI) and histopathologic analyses. Two weeks after ISO treatment, the animal showed an apical aneurysm accompanied by reduced radial strain in corresponding segments and impaired global systolic function. DT-MRI revealed a loss of contractile fiber tracts together with a disarray of remaining fibers as corresponding microstructural correlates. This preclinical case report provides valuable insights into pathophysiology and morphologic–functional relations of heart failure following MI using emerging imaging technologies.
In this thesis we consider the hybrid quantum Monte Carlo method for simulations of the Hubbard and Su-Schrieffer-Heeger model. In the first instance, we discuss the hybrid quantum Monte Carlo method for the Hubbard model on a square lattice. We point out potential ergodicity issues and provide a way to circumvent them by a complexification of the method. Furthermore, we compare the efficiency of the hybrid quantum Monte Carlo method with a well established determinantal quantum Monte Carlo method for simulations of the half-filled Hubbard model on square lattices. One reason why the hybrid quantum Monte Carlo method loses the comparison is that we do not observe the desired sub-quadratic scaling of the numerical effort. Afterwards we present a formulation of the hybrid quantum Monte Carlo method for the Su-Schrieffer-Heeger model in two dimensions. Electron-phonon models like this are in general very hard to simulate using other Monte Carlo methods in more than one dimensions. It turns out that the hybrid quantum Monte Carlo method is much better suited for this model . We achieve favorable scaling properties and provide a proof of concept. Subsequently, we use the hybrid quantum Monte Carlo method to investigate the Su-Schrieffer-Heeger model in detail at half-filling in two dimensions. We present numerical data for staggered valence bond order at small phonon frequencies and an antiferromagnetic order at high frequencies. Due to an O(4) symmetry the antiferromagnetic order is connected to a superconducting charge density wave. Considering the Su-Schrieffer-Heeger model without tight-binding hopping reveals an additional unconstrained Z_2 gauge theory. In this case, we find indications for π-fluxes and a possible Z_2 Dirac deconfined phase as well as for a columnar valence bond ordered state at low phonon energies. In our investigations of the several phase transitions we discuss the different possibilities for the underlying mechanisms and reveal first insights into a rich phase diagram.
Patienten mit JIA erhielten weniger Lebendimpfungen als gesunde Kontrollpersonen, für Totimpfstoffe waren die Immunisierungsraten vergleichbar.
Ebenso zeigten die Antikörper Konzentrationen zwischen den JIA Patienten und den gesunden Kontrollpersonen keine signifikanten Unterschiede. Bei Untersuchungen innerhalb der JIA Patienten Gruppe zeigte lediglich der Abstand zwischen der letzten Auffrischungsimpfung und der Blutentnahme signifikante Ergebnisse.
Cooperative Breeding in the Ambrosia Beetle Xyleborus affinis and Management of Its Fungal Symbionts
(2020)
Fungus-farming is known from attine ants, macrotermites, and ambrosia beetles (Scolytinae, Platypodinae). Farming ant and termite societies are superorganismal and grow fungal cultivars in monocultures. Social organization of ambrosia beetle groups and their farming systems are poorly studied, because of their enigmatic life within tunnel systems inside of wood. Ambrosia beetle-fungus symbioses evolved many times independently in both the beetles and their fungal cultivars. Observations suggest that there is evolutionary convergence between these lineages, but also a high variation in the degree of sociality and the modes of fungiculture. Using a laboratory observation technique, I here tried to give insights into the social system and fungus symbiosis of the sugar-cane borer, Xyleborus affinis Eichhoff (Scolytinae: Curculionidae), a currently poorly studied ambrosia beetle. The study revealed a cooperatively breeding system characterized by delayed dispersal of adult daughters, alloparental brood care by larvae and adults, and about half of the totipotent adult daughters laying eggs within the natal nest. Most interesting, there was a tendency of egg-laying females to engage more commonly in mutually beneficial behaviors than non-egg-layers. Fungus gardens covering gallery walls composed of five different filamentous fungi. A Raffaelea isolate was predominant and together with an unidentified fungus likely served as the main food for adults and larvae. Three isolates, a Mucor, a Fusarium and a Phaeoacremonium isolate were most abundant in the oldest gallery part close to the entrance; Mucor, Fusarium and the Raffaelea isolate in diseased individuals. Additionally, there was correlative evidence for some fungal isoaltes influencing beetle feeding and hygienic behaviors. Overall, X. affinis is now the second ambrosia beetle that can be classified as a cooperative breeder with division of labor among and between adults and larvae.
Risk Stratification for Bipolar Disorder Using Polygenic Risk Scores Among Young High-Risk Adults
(2020)
Objective:
Identifying high-risk groups with an increased genetic liability for bipolar disorder (BD) will provide insights into the etiology of BD and contribute to early detection of BD. We used the BD polygenic risk score (PRS) derived from BD genome-wide association studies (GWAS) to explore how such genetic risk manifests in young, high-risk adults. We postulated that BD-PRS would be associated with risk factors for BD.
Methods:
A final sample of 185 young, high-risk German adults (aged 18–35 years) were grouped into three risk groups and compared to a healthy control group (n = 1,100). The risk groups comprised 117 cases with attention deficit hyperactivity disorder (ADHD), 45 with major depressive disorder (MDD), and 23 help-seeking adults with early recognition symptoms [ER: positive family history for BD, (sub)threshold affective symptomatology and/or mood swings, sleeping disorder]. BD-PRS was computed for each participant. Logistic regression models (controlling for sex, age, and the first five ancestry principal components) were used to assess associations of BD-PRS and the high-risk phenotypes.
Results:
We observed an association between BD-PRS and combined risk group status (OR = 1.48, p < 0.001), ADHD diagnosis (OR = 1.32, p = 0.009), MDD diagnosis (OR = 1.96, p < 0.001), and ER group status (OR = 1.7, p = 0.025; not significant after correction for multiple testing) compared to healthy controls.
Conclusions:
In the present study, increased genetic risk for BD was a significant predictor for MDD and ADHD status, but not for ER. These findings support an underlying shared risk for both MDD and BD as well as ADHD and BD. Improving our understanding of the underlying genetic architecture of these phenotypes may aid in early identification and risk stratification.
Polyploid genomes present a challenge for cytogenetic and genomic studies, due to the high number of similar size chromosomes and the simultaneous presence of hardly distinguishable paralogous elements. The karyotype of the Siberian sturgeon (Acipenser baerii) contains around 250 chromosomes and is remarkable for the presence of paralogs from two rounds of whole-genome duplications (WGD). In this study, we applied the sterlet-derived acipenserid satDNA-based whole chromosome-specific probes to analyze the Siberian sturgeon karyotype. We demonstrate that the last genome duplication event in the Siberian sturgeon was accompanied by the simultaneous expansion of several repetitive DNA families. Some of the repetitive probes serve as good cytogenetic markers distinguishing paralogous chromosomes and detecting ancestral syntenic regions, which underwent fusions and fissions. The tendency of minisatellite specificity for chromosome size groups previously observed in the sterlet genome is also visible in the Siberian sturgeon. We provide an initial physical chromosome map of the Siberian sturgeon genome supported by molecular markers. The application of these data will facilitate genomic studies in other recent polyploid sturgeon species.
We present the rapid biophysical characterization of six previously reported putative G‐quadruplex‐forming RNAs from the 5′‐untranslated region (5′‐UTR) of silvestrol‐sensitive transcripts for investigation of their secondary structures. By NMR and CD spectroscopic analysis, we found that only a single sequence—[AGG]\(_{2}\)[CGG]\(_{2}\)C—folds into a single well‐defined G‐quadruplex structure. Sequences with longer poly‐G strands form unspecific aggregates, whereas CGG‐repeat‐containing sequences exhibit a temperature‐dependent equilibrium between a hairpin and a G‐quadruplex structure. The applied experimental strategy is fast and provides robust readout for G‐quadruplex‐forming capacities of RNA oligomers.
Salts of the tetrakis(pentafluoroethyl)aluminate anion [Al(C\(_{2}\)F\(_{5}\))\(_{2}\)]\(^{-}\) were obtained from AlCl\(_{3}\) and LiC\(_{2}\)F\(_{5}\). They were isolated with different counter‐cations and characterized by NMR and vibrational spectroscopy and mass spectrometry. Degradation of the [Al(C\(_{2}\)F\(_{5}\))\(_{4}\)]\(^{-}\) ion was found to proceed via 1,2‐fluorine shifts and stepwise loss of CF(CF\(_{3}\)) under formation of [(C\(_{2}\)F\(_{5}\))\(_{4-n}\)AlF\(_{n}\)]− (n=1–4) as assessed by NMR spectroscopy and mass spectrometry and supported by results of DFT calculations. In addition, the [(C\(_{2}\)F\(_{5}\))AlF\(_{3}\)]\(^{-}\) ion was structurally characterized.
Amphibians evolved in the Devonian period about 400 Mya and represent a transition step in tetrapod evolution. Among amphibians, high-throughput sequencing data are very limited for Caudata, due to their largest genome sizes among terrestrial vertebrates. In this paper we present the transcriptome from the fire bellied newt Cynops orientalis. Data here presented display a high level of completeness, comparable to the fully sequenced genomes available from other amphibians. Moreover, this work focused on genes involved in gametogenesis and sexual development. Surprisingly, the gsdf gene was identified for the first time in a tetrapod species, so far known only from bony fish and basal sarcopterygians. Our analysis failed to isolate fgf24 and foxl3, supporting the possible loss of both genes in the common ancestor of Rhipidistians. In Cynops, the expression analysis of genes described to be sex-related in vertebrates singled out an expected functional role for some genes, while others displayed an unforeseen behavior, confirming the high variability of the sex-related pathway in vertebrates.
The investigation of the biodistribution profile of a cell-based medicinal product is a pivotal prerequisite to allow a factual benefit-risk assessment within the non-clinical to clinical translation in product development. Here, a qPCR-based method to determine the amount of human DNA in mouse DNA was validated according to the guidelines of the European Medicines Agency and the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use. Furthermore, a preclinical worst-case scenario study was performed in which this method was applied to investigate the biodistribution of 2 x 10\(^6\) intravenously administered, genetically modified, blood outgrowth endothelial cells from hemophilia A patients after 24 h and 7 days. The validation of the qPCR method demonstrated high accuracy, precision, and linearity for the concentration interval of 1:1 x 10\(^3\) to 1:1 x 10\(^6\) human to mouse DNA. The application of this method in the biodistribution study resulted in the detection of human genomes in four out of the eight investigated organs after 24 h. After 7 days, no human DNA was detected in the eight organs analyzed. This biodistribution study provides mandatory data on the toxicokinetic safety profile of an actual candidate cell-based medicinal product. The extensive evaluation of the required validation parameters confirms the applicability of the qPCR method for non-clinical biodistribution studies.
The DFG project “SDN-enabled Application-aware Network Control Architectures and their Performance Assessment” (DFG SDN-App) focused in phase 1 (Jan 2017 – Dec 2019) on software defined networking (SDN). Being a fundamental paradigm shift, SDN enables a remote control of networking devices made by different vendors from a logically centralized controller. In principle, this enables a more dynamic and flexible management of network resources compared to the traditional legacy networks. Phase 1 focused on multimedia applications and their users’ Quality of Experience (QoE).
This documents reports the achievements of the first phase (Jan 2017 – Dec 2019), which is jointly carried out by the Technical University of Munich, Technical University of Berlin, and University of Würzburg. The project started at the institutions in Munich and Würzburg in January 2017 and lasted until December 2019.
In Phase 1, the project targeted the development of fundamental control mechanisms for network-aware application control and application-aware network control in Software Defined Networks (SDN) so to enhance the user perceived quality (QoE). The idea is to leverage the QoE from multiple applications as control input parameter for application-and network control mechanisms. These mechanisms are implemented by an Application Control Plane (ACP) and a Network Control Plane (NCP). In order to obtain a global view of the current system state, applications and network parameters are monitored and communicated to the respective control plane interface. Network and application information and their demands are exchanged between the control planes so to derive appropriate control actions. To this end, a methodology is developed to assess the application performance and in particular the QoE. This requires an appropriate QoE modeling of the applications considered in the project as well as metrics like QoE fairness to be utilized within QoE management.
In summary, the application-network interaction can improve the QoE for multi-application scenarios. This is ensured by utilizing information from the application layer, which are mapped by appropriate QoS-QoE models to QoE within a network control plane. On the other hand, network information is monitored and communicated to the application control plane. Network and application information and their demands are exchanged between the control planes so to derive appropriate control actions.
Bei der vorliegenden Arbeit handelt es sich um eine explorative Pilotstudie im Rahmen einer Kohortenstudie, die als Kooperationsprojekt des Zentrums für Vorsprachliche Entwicklung und Entwicklungsstörungen (ZVES) der Poliklinik für Kieferorthopädie und dem Comprehensive Hearing Center (CHC) der Klinik und Poliklinik für Hals-, Nasen- und Ohrenkrankheiten, plastische und ästhetische Operationen des Universitätsklinikums Würzburg entstanden ist.
In der vorliegenden Arbeit wurde untersucht, inwiefern die Fähigkeit zu hören die Melodieeigenschaften von Vokanten, einer frühen Form von Komfort-Säuglingslauten, beeinflusst. Sofern sich bereits bei dieser primitiven Vokalisationsart Differenzen zeigten, so die Annahme, würden auch komplexere Vokalisationen Unterschiede zwischen gesunden und hörgeschädigten Säuglingen aufweisen.
Anhand der ersten Studienprobanden der Kohortenstudie sowie ergänzender, anonymisiert vorliegender Daten des ZVES Archivs, wurden ausgewählte melodische und strukturelle Kenngrößen der Komfortvokalisation ausgewertet. Als melodische Kenngrößen wurden hierbei insbesondere die mittlere Grundfrequenz sowie die maximale Frequenzamplitude (Hub) betrachtet. Zudem wurden die strukturellen Melodieeigenschaften und die Melodiekomplexität bestimmt. Gegenstand der signalanalytischen Untersuchung war die vergleichende Analyse hochgradig sensorineural hörgeschädigter Probanden (HI) mit unauffälligen Säuglingen der Kontrollgruppe (KG).
Es zeigte sich, dass bereits bei dieser einfachen Vokalisationsart Unterschiede in der Melodiestruktur zwischen den beiden Gruppen bestehen. In der hörgeschädigten Probandengruppe fanden sich tendenziell weniger komplexe Strukturen verglichen mit der gesunden Kontrollgruppe. Berücksichtigt man die Altersentwicklung, lässt sich bei beiden Gruppen eine Zunahme der Komplexität feststellen, die allerdings bei der HI-Gruppe deutlich geringer war. Auch bei der Grundfrequenzanalyse ergaben sich Differenzen zwischen den beiden Probandengruppen. Sowohl bei der Analyse der mittleren Grundfrequenz als auch der maximalen Frequenzamplitude, zeigten sich bei Betrachtung des gesamten untersuchten Altersbereichs tendenziell höhere Werte für die HI-Gruppe.
Zusammenfassung
Der Beitrag stellt vor, wie die Universitätsbibliothek Würzburg im Rahmen ihrer Veranstaltungen rund um das 400-jährige Jubiläum für die Studierenden im Lesesaal ein Escape Game konzipierte und veranstaltete. Nach einem kurzen Abriss, woher das Konzept des Live-Action Escape Game stammt, liegt der Fokus auf den konkreten Arbeitsschritten, die mit der Umsetzung dieses an wissenschaftlichen Bibliotheken bisher wenig vertretenen Formats verbunden waren.
This article examines so-called colonial discourses in Belgium on the former Sub-Saharan colony owned by the Belgian King, Leopold II., which today is known as the Democratic Republic of Congo (DR Congo) or the Congo-Kinshasa. After having introduced the colonial history of the DR Congo from the 15th century until 1910, an empirical analysis of the colonial discourses in Belgium from the 1890s until today will be illustrated in conjunction with Belgium’s linguistic-cultural division and the age-related divergence. Belgian colonial discourse is characterized by a historical misrepresentation by the political authorities while especially social forces have pled for a critical examination of their own colonial history in Belgium since the year 2000.
Background
The treatment of septic arthritis, caused by either hematogenous seeding, injections, or surgery, can be challenging. Staged reverse shoulder arthroplasty (RSA) with temporary implantation of an antibiotic-loaded spacer is widely accepted but still discussed controversially. This study investigated the shoulder-specific bacterial spectrum, infection control rate, functional outcome, and infection-free survival rate after staged RSA in the mid- to long-term follow-up. It was hypothesized that staged RSA would show a high infection-free survival rate.
Methods
A total of 39 patients treated with staged RSA for primary septic arthritis (n = 8), secondary infection (n = 8), or periprosthetic infection (n = 23) were retrospectively included. The infection control rate was calculated based on cultures taken intraoperatively at spacer removal and RSA implantation. Infection-free survival was defined as no revision due to infection. The minimum follow-up period for functional outcome assessment was 2 years (n = 14; mean, 76 months; range, 31-128 months).
Results
Cutibacterium (26%) and coagulase-negative staphylococci (23%) were the predominant pathogens. The infection control rate was 90%. The cumulative infection-free survival rate was 91% after 128 months. Follow-up examinations showed a mean Constant score of 48 (range, 7-85), a mean QuickDASH (short version of Disabilities of the Arm, Shoulder and Hand questionnaire) score of 40.0 (range, 11.4-93.3), and a mean pain score of 1.6 (range, 0-7).
Conclusion
Staged RSA implantation was confirmed to be a reliable treatment option for primary, secondary, and periprosthetic infections of the shoulder. The infection control rate and infection-free survival rate are satisfactory. However, patients and surgeons must be aware of functional impairment even after successful treatment of infections.
Increasing natural pest control in agricultural fields is an important aim of ecological intensification. Combined effects of landscape context and local placement of agri‐environmental schemes (AES) on natural pest control and within‐field distance functions of natural pest control agents have rarely been addressed but might affect the distribution of biocontrol providers. Importantly, it is currently unknown whether ecosystem services provided by adjacent AES are consistent for different crop types during crop rotation.
In this study, we assessed whether crop rotation from oilseed rape to cereals altered within‐field distance functions of ground‐dwelling predators from adjacent agri‐environmental fields along a gradient in landscape context. Additionally, we recorded crop pests, predation rates, parasitoids as well as crop yields on a total of 30 study sites.
Distance functions varied between trophic levels: Carabid richness decreased while densities of carabid beetles, staphylinid beetles as well as crop yields increased towards the field centres. Distance functions of parasitoids and pests were modulated by the amount of semi‐natural habitat in the surrounding landscape, while the effects of adjacent AES were limited.
Distance decay functions found for ground‐dwelling predators in oilseed rape in the previous year were not always present in cereals. Increasing distance to the field edge also increased effects of crop rotation on carabid beetle assemblages, indicating a source habitat function of field edges.
Synthesis and applications. Distance functions of natural pest control are not universal and the effects of agri‐environmental schemes (AES) in different adjacent crops during crop rotation vary and depend on ecological contrasts. A network of semi‐natural habitats and spatially optimized AES habitats can benefit pest control in agricultural landscapes, but constraints as a result of crop type need to be addressed by annually targeted, spatially shifting agri‐environment schemes for different crops.
Plants may use different strategies to attract pollinators in long distance (e.g. floral display) and in short distance (e.g. ratio between differentially colored flowers) scales. The Verbenaceae Lantana canescens Kunth is a wide spread species in open sites of the Brazilian Pantanal wetland. Individuals of this generalist species can produce a variable number of open inflorescences with yellow and white flowers that are organized in whorls. In this study we tested the hypothesis that increased floral display (long distance attraction) and the ratio between yellow and white flowers (short distance attraction) enhances the number of pollinator species and individuals. We observed flower visitors and calculated floral parameters in 38 plots of 1 m2 each, that contained a varying number of flowering L. canescens individuals. Non-metric multidimensional scaling and Bray-Curtis distances were used to account for flower visitor composition and the relative visitation rate, respectively. We used a structural equation model to test the power of each predictor variable on the visitation rate and a covariance analysis to disentangle the effect of each independent variable on the frequency of plant-pollinator interactions. We found that the number of flower visitors and the visitation rate increased with increasing number of inflorescences. Disentangling long and short distance attraction indicated that the number of inflorescences (per plot) and the number of yellow flowers (yellowing effect) contributed most to flower visitation at long and short distance, respectively.
Intrakranielle Blutungen sind im Säuglingsalter seltene, aber lebensbedrohende Ereignisse. Neben Gefäßmissbildungen, Stoffwechseldefekten sowie Störungen der Blutgerinnung kommen v. a. nichtakzidentielle Traumata, Schütteltrauma in Betracht. Die klinische Diagnostik umfasst hinsichtlich der Blutungsgenese neben Sonographie und MRT als apparatives Verfahren auch eine Fundoskopie sowie laborchemische Analysen, insbesondere der Gerinnungsparameter. Für die Blutgerinnung ist das fettlösliche Vitamin K essenziell: Frühe, klassische und späte Vitamin-K-Mangel-Blutungen werden dabei unterschieden. Um ein gehäuftes Wiederauftreten von Vitamin-K-Mangel-Blutungen bei Neugeborenen und jungen Säuglingen zu verhindern, bedarf es einer hinreichenden Aufklärung der Eltern. Eine Verweigerung der Prophylaxe scheint Folge einer weltanschaulich begründeten Ablehnung der Schulmedizin und ein zunehmendes Phänomen in wohlhabenden Industrieländern zu sein.
The aim of the present study was a refined analysis of neuroinflammation including TMEM119 as a useful microglia-specific marker in forensic assessments of traumatic causes of death, e.g., traumatic brain injury (TBI). Human brain tissue samples were obtained from autopsies and divided into cases with lethal TBI (n = 25) and subdivided into three groups according to their trauma survival time and compared with an age-, gender-, and postmortem interval-matched cohort of sudden cardiovascular fatalities as controls (n = 23). Brain tissue samples next to cortex contusions and surrounding white matter as well as samples of the ipsilateral uninjured brain stem and cerebellum were collected and stained immunohistochemically with antibodies against TMEM119, CD206, and CCR2. We could document the highest number of TMEM119-positive cells in acute TBI death with highly significant differences to the control numbers. CCR2-positive monocytes showed a significantly higher cell count in the cortex samples of TBI cases than in the controls with an increasing number of immunopositive cells over time. The number of CD206-positive M2 microglial cells increased survival time-dependent. After 3 days of survival, the cell number increased significantly in all four regions investigated compared with controls. In sum, we validate a specific and robustly expressed as well as fast reacting microglia marker, TMEM119, which distinguishes microglia from resident and infiltrating macrophages and thus offers a great potential for the estimation of the minimum survival time after TBI.
Hintergrund: Für Beschäftigte im Gesundheitswesen besteht die Gefahr einer Kontamination und folgenden Infektion durch Blut übertragbare Krankheitserreger, insbesondere durch Hepatitis B, C und das Humane Immundefizienz-Virus. Die Kontaminationshäufigkeiten und -hergänge sind unter den Beschäftigten allerdings nicht gleich verteilt.
Ziel der Arbeit: Identifikation von Risikogruppen für Kontaminationsereignisse mit potentiell infektiösen Körpermaterialien durch detaillierte Subgruppenanalysen.
Material und Methoden: Retrospektive Studie an einer deutschen Universitätsklinik im Zeitraum 2010 bis 2014. Die Datenerhebung erfolgte mittels standardisierter Checklisten. Abweichungen der absoluten bzw. relativen Häufigkeiten wurden mittels Kontingenzanalysen, Fishers exaktem Test sowie Kaplan-Meier-Survival-Funktionen untersucht.
Ergebnisse: Kontaminationsereignisse mit potentiell infektiösen Körpermaterialien stellen mit knapp einem Ereignis pro Tag an einem deutschen Universitätsklinikum häufige Arbeitsunfälle dar. Ein erhöhtes Kontaminationsrisiko scheint unter Beschäftigten der operativen Fächer, der Desinfektion/Sterilisation, Hebammen und Kardiotechniker zu bestehen. Niedrige Hepatitis B-Impfraten fanden sich unter Zahnmedizinstudierenden.
Diskussion: Anhand der insgesamt niedrigen Kontaminations- und hohen Hepatitis B-Durchimpfungsraten kann auf sichere Arbeitsbedingungen geschlossen werden, vorbehaltlich niedriger Dunkelziffern. Allerdings sollte aufgrund der teils geringen Kopfzahlen in den Risikoberufsgruppen eine besonders tiefgreifende Evaluation der Arbeitsbedingungen zur Risikoreduktion von Kontaminationsereignissen mit potentiell infektiösen Körpermaterialien erfolgen.
Time-triggered communication is widely used throughout several industry do-
mains, primarily for reliable and real-time capable data transfers. However,
existing time-triggered technologies are designed for terrestrial usage and not
directly applicable to space applications due to the harsh environment. In-
stead, specific hardware must be developed to deal with thermal, mechanical,
and especially radiation effects.
SpaceWire, as an event-triggered communication technology, has been used
for years in a large number of space missions. Its moderate complexity, her-
itage, and transmission rates up to 400 MBits/s are one of the main ad-
vantages and often without alternatives for on-board computing systems of
spacecraft. At present, real-time data transfers are either achieved by prior-
itization inside SpaceWire routers or by applying a simplified time-triggered
approach. These solutions either imply problems if they are used inside dis-
tributed on-board computing systems or in case of networks with more than
a single router are required.
This work provides a solution for the real-time problem by developing
a novel clock synchronization approach. This approach is focused on being
compatible with distributed system structures and allows time-triggered data
transfers. A significant difference to existing technologies is the remote clock
estimation by the use of pulses. They are transferred over the network and
remove the need for latency accumulation, which allows the incorporation of
standardized SpaceWire equipment. Additionally, local clocks are controlled
decentralized and provide different correction capabilities in order to handle
oscillator induced uncertainties. All these functionalities are provided by a developed Network Controller (NC), able to isolate the attached network and
to control accesses.
Nowadays, employees have to work with applications, technical services, and systems every day for hours. Hence, performance degradation of such systems might be perceived negatively by the employees, increase frustration, and might also have a negative effect on their productivity. The assessment of the application's performance in order to provide a smooth operation of the application is part of the application management. Within this process it is not sufficient to assess the system performance solely on technical performance parameters, e.g., response or loading times. These values have to be set into relation to the perceived performance quality on the user's side - the quality of experience (QoE).
This dissertation focuses on the monitoring and estimation of the QoE of enterprise applications. As building models to estimate the QoE requires quality ratings from the users as ground truth, one part of this work addresses methods to collect such ratings. Besides the evaluation of approaches to improve the quality of results of tasks and studies completed on crowdsourcing platforms, a general concept for monitoring and estimating QoE in enterprise environments is presented. Here, relevant design dimension of subjective studies are identified and their impact of the QoE is evaluated and discussed. By considering the findings, a methodology for collecting quality ratings from employees during their regular work is developed. The method is realized by implementing a tool to conduct short surveys and deployed in a cooperating company.
As a foundation for learning QoE estimation models, this work investigates the relationship between user-provided ratings and technical performance parameters. This analysis is based on a data set collected in a user study in a cooperating company during a time span of 1.5 years. Finally, two QoE estimation models are introduced and their performance is evaluated.
Evaluating the Quality of Experience (QoE) of video streaming and its influence factors has become paramount for streaming providers, as they want to maintain high satisfaction for their customers. In this context, crowdsourced user studies became a valuable tool to evaluate different factors which can affect the perceived user experience on a large scale. In general, most of these crowdsourcing studies either use, what we refer to, as an in vivo or an in vitro interface design. In vivo design means that the study participant has to rate the QoE of a video that is embedded in an application similar to a real streaming service, e.g., YouTube or Netflix. In vitro design refers to a setting, in which the video stream is separated from a specific service and thus, the video plays on a plain background. Although these interface designs vary widely, the results are often compared and generalized. In this work, we use a crowdsourcing study to investigate the influence of three interface design alternatives, an in vitro and two in vivo designs with different levels of interactiveness, on the perceived video QoE. Contrary to our expectations, the results indicate that there is no significant influence of the study’s interface design in general on the video experience. Furthermore, we found that the in vivo design does not reduce the test takers’ attentiveness. However, we observed that participants who interacted with the test interface reported a higher video QoE than other groups.
Hydrogels that can mimic mechanical properties and functions of biological tissue have attracted great interest in tissue engineering and biofabrication. In these fields, new materials and approaches to prepare hydrogels without using toxic starting materials or materials that decompose into toxic compounds remain to be sought after. Here, we report the crosslinking of commercial, unfunctionalized hydrophilic poly(2-ethyl-2-oxazoline) using peroxide copolymers in their melt. The influence of temperature, peroxide copolymer concentration, and duration of the crosslinking process has been investigated. The method allows to create hydrogels from unfunctionalized polymers in their melt and to control the mechanical properties of the resulting materials. The design of hydrogels with a suitable mechanical performance is of crucial importance in many existing and potential applications of soft materials, including medical applications.
Head and neck squamous cell carcinoma (HNSCC) is known to overexpress a variety of receptor tyrosine kinases, such as the HGF receptor Met. Like other malignancies, HNSCC involves a mutual interaction between the tumor cells and surrounding tissues and cells. We hypothesized that activation of HGF/Met signaling in HNSCC influences glucose metabolism and therefore substantially changes the tumor microenvironment. To determine the effect of HGF, we submitted three established HNSCC cell lines to mRNA sequencing. Dynamic changes in glucose metabolism were measured in real time by an extracellular flux analyzer. As expected, the cell lines exhibited different levels of Met and responded differently to HGF stimulation. As confirmed by mRNA sequencing, the level of Met expression was associated with the number of upregulated HGF-dependent genes. Overall, Met stimulation by HGF leads to increased glycolysis, presumably mediated by higher expression of three key enzymes of glycolysis. These effects appear to be stronger in Met\(^{high}\)-expressing HNSCC cells. Collectively, our data support the hypothesized role of HGF/Met signaling in metabolic reprogramming of HNSCC.
Head and neck squamous cell carcinoma (HNSCC) is a widespread disease with a low survival rate and a high risk of recurrence. Nowadays, immune checkpoint inhibitor (ICI) treatment is approved for HNSCC as a first-line treatment in recurrent and metastatic disease. ICI treatment yields a clear survival benefit, but overall response rates are still unsatisfactory. As shown in different cancer models, hepatocyte growth factor/mesenchymal–epithelial transition (HGF/Met) signaling contributes to an immunosuppressive microenvironment. Therefore, we investigated the relationship between HGF and programmed cell death protein 1 (PD-L1) expression in HNSCC cell lines. The preclinical data show a robust PD-L1 induction upon HGF stimulation. Further analysis revealed that the HGF-mediated upregulation of PD-L1 is MAP kinase-dependent. We then hypothesized that serum levels of HGF and soluble programmed cell death protein 1 (sPD-L1) could be potential markers of ICI treatment failure. Thus, we determined serum levels of these proteins in 20 HNSCC patients before ICI treatment and correlated them with treatment outcomes. Importantly, the clinical data showed a positive correlation of both serum proteins (HGF and sPD-L1) in HNSCC patient’s sera. Moreover, the serum concentration of sPD-L1 was significantly higher in ICI non-responsive patients. Our findings indicate a potential role for sPD-L1 as a prognostic marker for ICI treatment in HNSCC.