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Institute
- Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie (479) (remove)
Sonstige beteiligte Institutionen
- Clinical Trial Center (CTC) / Zentrale für Klinische Studien Würzburg (ZKSW) (2)
- Department of Nuclear Medicine, Kanazawa University (1)
- Institut für Biopsychologie, Universität Dresden (1)
- Institut für Neurowissenschaften der Universität Mailand (1)
- Interdisziplinäres Zentrum für Klinische Forschung (IZKF) (1)
- Interdisziplinäres Zentrum für Klinische Forschung (IZKF) Würzburg (1)
- Johns Hopkins School of Medicine, Baltimore, MD, U.S. (1)
- Johns Hopkins University School of Medicine (1)
- Maastricht University, Department of Psychiatry and Neuropsychology (1)
- Translationale soziale Neurowissenschaften (1)
ResearcherID
- N-8985-2015 (1)
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.
Ablation of BRaf Impairs Neuronal Differentiation in the Postnatal Hippocampus and Cerebellum
(2013)
This study focuses on the role of the kinase BRaf in postnatal brain development. Mice expressing truncated, non-functional BRaf in neural stem cell-derived brain tissue demonstrate alterations in the cerebellum, with decreased sizes and fuzzy borders of the glomeruli in the granule cell layer. In addition we observed reduced numbers and misplaced ectopic Purkinje cells that showed an altered structure of their dendritic arborizations in the hippocampus, while the overall cornus ammonis architecture appeared to be unchanged. In male mice lacking BRaf in the hippocampus the size of the granule cell layer was normal at postnatal day 12 (P12) but diminished at P21, as compared to control littermates. This defect was caused by a reduced ability of dentate gyrus progenitor cells to differentiate into NeuN positive granule cell neurons. In vitro cell culture of P0/P1 hippocampal cells revealed that BRaf deficient cells were impaired in their ability to form microtubule-associated protein 2 positive neurons. Together with the alterations in behaviour, such as autoaggression and loss of balance fitness, these observations indicate that in the absence of BRaf all neuronal cellular structures develop, but neuronal circuits in the cerebellum and hippocampus are partially disturbed besides impaired neuronal generation in both structures.
Sustained anticipatory anxiety is central to Generalized Anxiety Disorder (GAD). During anticipatory anxiety, phasic threat responding appears to be mediated by the amygdala, while sustained threat responding seems related to the bed nucleus of the stria terminalis (BNST). Although sustained anticipatory anxiety in GAD patients was proposed to be associated with BNST activity alterations, firm evidence is lacking. We aimed to explore temporal characteristics of BNST and amygdala activity during threat anticipation in GAD patients. Nineteen GAD patients and nineteen healthy controls (HC) underwent functional magnetic resonance imaging (fMRI) during a temporally unpredictable threat anticipation paradigm. We defined phasic and a systematic variation of sustained response models for blood oxygen level-dependent responses during threat anticipation, to disentangle temporally dissociable involvement of the BNST and the amygdala. GAD patients relative to HC responded with increased phasic amygdala activity to onset of threat anticipation and with elevated sustained BNST activity that was delayed relative to the onset of threat anticipation. Both the amygdala and the BNST displayed altered responses during threat anticipation in GAD patients, albeit with different time courses. The results for the BNST activation hint towards its role in sustained threat responding, and contribute to a deeper understanding of pathological sustained anticipatory anxiety in GAD.
The transcription factor Lmx1b is essential for the differentiation and survival of central serotonergic (5-HTergic) neurons during embryonic development. However, the role of Lmx1b in adult 5-HTergic neurons is unknown. We used an inducible Cre-LoxP system to selectively inactivate Lmx1b expression in the raphe nuclei of adult mice. Pet1-CreER(T2) mice were generated and crossed with Lmx1b(flox/flox) mice to obtain Pet1-CreER(T2); Lmx1b(flox/flox) mice (which termed as Lmx1b iCKO). After administration of tamoxifen, the level of 5-HT in the brain of Lmx1b iCKO mice was reduced to 60% of that in control mice, and the expression of tryptophan hydroxylase 2 (Tph2), serotonin transporter (Sert) and vesicular monoamine transporter 2 (Vmat2) was greatly down-regulated. On the other hand, the expression of dopamine and norepinephrine as well as aromatic L-amino acid decarboxylase (Aadc) and Pet1 was unchanged. Our results reveal that Lmx1b is required for the biosynthesis of 5-HT in adult mouse brain, and it may be involved in maintaining normal functions of central 5-HTergic neurons by regulating the expression of Tph2, Sert and Vmat2.
Es existiert bereits eine Vielzahl von tierexperimentellen Studien bezüglich Einflussfaktoren auf die adulte Neurogenese. Nachdem die Teilungsfähigkeit von neuralen Stammzellen Ende der 1990er Jahre auch im adulten humanen Gehirn nachgewiesen wurde, war es das Ziel der vorliegenden Arbeit, adulte Neurogenese bei psychischen Erkrankungen zu quantifizieren bzw. den Ein-fluss medikamentöser Therapien auf die adulte Neurogenese zu untersuchen. Diese Studie stellt dabei die bislang einzige Arbeit dar, die sich mit der humanen adulten Neurogenese bei psychischen Erkrankungen beschäftigt. Mittels Doppelfärbungen von Ki67 und BrdU an Mausgewebe wurde zunächst nachgewiesen, dass das Ki67-Antigen ein zuverlässiger Marker für sich teilende Zellen ist, woraufhin die Färbeprozedur problemlos auf Humangewebe übertragen werden konnte. Die Quantifizierung von Ki67 positiven Zellen erfolgte entlang der Körnerzellschicht in einem definierten Abstand in der Einheit Zellen pro Millimeter. Die Ergebnisse der hier vorliegenden Studie widersprechen in mehrfacher Hinsicht den Hypothesen, die sich aus tierexperimentellen Studien ergeben. Während die neurale Stammzellproli-feration bei schizophrenen Psychosen signifikant vermindert ist, findet sich kein Unterschied bei affektiven Erkrankungen im Vergleich zu Kontrollen. Weder wird die „Neurogenese-Hypothese“ der Depression bestätigt, noch zeigte sich ein Effekt antidepressiv oder antipsychotisch wirksamer Pharmaka auf die Rate adulter Neurogenese, da eine pharmakologische Therapie jedweder Art keinen Einfluss auf die Zahl Ki67 positiver Zellen hatte. Deshalb scheint eine Steigerung der adulten Neurogenese kein Wirkmechanismus dieser Medikamente zu sein. Ein überraschendes Ergebnis jedoch ist die signifikant reduzierte Rate adulter Neurogenese bei an Schizophrenie erkrankten Patienten. Aufgrund der sehr begrenzten Anzahl untersuchter Patienten ist die vorliegende Studie in ihrer Aussagekraft jedoch eingeschränkt und muss daher an einem größeren Patientenkollektiv wiederholt werden. Eine Vielzahl von Fragen bzgl. des Stellenwerts der adulten Neurogenese bei psychischen Erkrankungen bleibt darüber hinaus weiter ungeklärt, was die Durchführung weiterer Studien am adulten humanen Gehirn verlangt.
Das serotonerge System des Gehirns mit seinen Projektionen ins limbische System ist an der Pathogenese der Depression und anderer neuropsychiatrischer Erkrankungen beteiligt. Bei der serotonergen Neurotransmission spielt der Serotonintransporter (5-HTT) eine wichtige Rolle und ist auch therapeutischer Angriffspunkt verschiedener Antidepressiva. Das Tiermodell der 5-HTT-Knockout(KO)-Maus dient der Untersuchung des serotonergen Systems. Diese Tiere besitzen neben einem verstärkten Angst-ähnlichen Verhalten auch erhöhte 5-HT-Konzentrationen im synaptischen Spalt. Lange Zeit war man der Meinung, dass nahezu alle Nervenzellen während der Embryogenese bis kurz nach der Geburt gebildet werden. Neuere Untersuchungen konnten Neurogenese jedoch auch im Gehirn adulter Tiere und auch des Menschen nachweisen. Eine wichtige Gehirnregion mit adulter Neurogenese (aN) bis ins hohe Alter ist der Gyrus dentatus (GD) des Hippocampus. Der Hippocampus ist zentraler Teil des limbischen Systems und hat Schlüsselfunktionen bei Lernprozessen und der Gedächtnisbildung und unterliegt durch seine serotonerge Innervation auch dem Einfluss von 5-HT. Die Zusammenfassung dieser Beobachtungen führte zu folgender Arbeitshypothese: Eine erniedrigte Zahl von 5-HTT führt zu chronisch erhöhten 5-HT-Spiegeln im synaptischen Spalt. Die damit verbundene Stimulation des serotonergen Systems führt zu einer veränderten aN. Ziel der vorliegenden Arbeit war die quantitative Bestimmung von Proliferation, Überleben und Migration neu entstandener Zellen in der KZS des GD von heterozygoten (HET) und homozygoten 5-HTT-Mäusen (KO), die mit Wildtyptieren (WT) verglichen wurden. Dabei wurden ältere Mäusen mit einem Durchschnittsalter von 13,8 Monaten verwendet. In der Gruppe zur Untersuchung der Proliferation wurden die Versuchstiere (n=18) 24 h nach Injektionen mit BrdU getötet und histologische Schnitte des Hippocampus post mortem untersucht. In der Gruppe zur Untersuchung der Überlebensrate und Migration wurden die Mäuse (n=18) 4 Wochen nach den BrdU-Injektionen getötet. Im Proliferationsversuch wurde ein signifikanter Unterschied bei der Konzentration BrdU-markierter Zellkerne in der SGZ zwischen KO-Mäusen im Vergleich zu WT-Tieren gefunden, wobei HET-Mäuse ebenfalls eine signifikant höhere Konzentration BrdU-markierter Zellkerne in der SGZ gegenüber WT-Mäusen zeigten. In diesem Experiment ist somit ein positiver Einfluss des heterozygoten und homozygoten 5-HTT-KO auf die Entstehungsrate neuer Zellen im GD des Hippocampus im Vergleich zu den WT-Tieren feststellbar. Im Versuch zur Feststellung der Überlebensrate neu gebildeter Zellen im Hippocampus nach vier Wochen zeigten KO-Mäuse gegenüber WT- und HET-Mäusen keine signifikant höhere Zahl BrdU-markierter Zellkerne. Auch bei der Untersuchung der Migration war beinahe die Hälfte der BrdU-markierten Zellen von der SGZ in die KZS eingewandert. Ein signifikanter Unterschied zwischen den verschiedenen 5-HTT-Genotypen zeigte sich nicht. Offenbar hat der heterozygote oder homozygote 5-HTT-KO keinen Einfluss auf die Überlebensrate und das Migrationsverhalten neu entstandener Zellen. Bei den in dieser Arbeit durchgeführten Untersuchungen zur aN in 5-HTT-KO-Mäusen konnte weder bei der Gruppe zur Untersuchung der Proliferation von neuronalen Vorläuferzellen noch bei der Untersuchung der Überlebensrate oder Migration eine Abhängigkeit der ermittelten Konzentration BrdU-positiver Zellen vom Geschlecht oder Alter gefunden werden. Es zeigte sich jedoch eine signifikante negative Korrelation zwischen dem Gewicht der Tiere und dem Anteil gewanderter Zellen im Migrationsversuch, d.h. leichtere Tiere hatten tendenziell einen höheren Anteil von in die KZS eingewanderten Zellen. Zusammengefasst zeigt die vorliegende Arbeit zum einen, dass ältere KO- oder HET-Mäuse im Vergleich zu WT-Tieren eine erhöhte Proliferationsrate von neuronalen Vorläuferzellen aufweisen. Zum anderen konnte ein indirekter Zusammenhang zwischen dem Gewicht der Versuchstiere und der Anzahl von in die KZS eingewanderten Zellen nachgewiesen werden. Bei einer Vergleichsuntersuchung in unserem Hause mit zwei Gruppen jüngerer adulter 5-HTT-KO Mäuse mit einem Durchschnittalter von 7 Wochen und 3 Monaten konnte die Beobachtung einer erhöhten Proliferation nicht gemacht werden. Wir gehen deshalb davon aus, dass in diesem 5-HTT-KO Modell nur in höherem Alter eine veränderte 5-HT-Homöostase zu einer verstärkten Proliferation von neuronalen Vorläuferzellen führt.
The etiology of emotion-related disorders such as anxiety or affective disorders is considered to be complex with an interaction of biological and environmental factors. Particular evidence has accumulated for alterations in the dopaminergic and noradrenergic system - partly conferred by catechol-O-methyltransferase (COMT) gene variation - for the adenosinergic system as well as for early life trauma to constitute risk factors for those conditions. Applying a multi-level approach, in a sample of 95 healthy adults, we investigated effects of the functional COMT Val158Met polymorphism, caffeine as an adenosine A2A receptor antagonist (300 mg in a placebo-controlled intervention design) and childhood maltreatment (CTQ) as well as their interaction on the affect-modulated startle response as a neurobiologically founded defensive reflex potentially related to fear- and distress-related disorders. COMT val/val genotype significantly increased startle magnitude in response to unpleasant stimuli, while met/met homozygotes showed a blunted startle response to aversive pictures. Furthermore, significant gene-environment interaction of COMT Val158Met genotype with CTQ was discerned with more maltreatment being associated with higher startle potentiation in val/val subjects but not in met carriers. No main effect of or interaction effects with caffeine were observed. Results indicate a main as well as a GxE effect of the COMT Val158Met variant and childhood maltreatment on the affect-modulated startle reflex, supporting a complex pathogenetic model of the affect-modulated startle reflex as a basic neurobiological defensive reflex potentially related to anxiety and affective disorders.
Aim
This study aimed to identify and compare age stereotypes of registered nurses and supervisors in clinical inpatient settings.
Design
Generic qualitative study using half‐standardized interviews.
Method
Nineteen face‐to‐face interviews and five focus groups (N = 50) were conducted with nurses of varying levels at a hospital of maximum medical care in Germany between August and November 2018 and were subjected to structured qualitative content analysis.
Results
Reflecting the ageing process and cooperation in mixed‐age teams, nursing staff and supervisors defined similar age stereotypes towards older and younger nurses reminiscent of common generational labels ‘Baby Boomers’ and Generations X. Their evaluation created an inconsistent and contradictory pattern differing to the respective work context and goals. Age stereotypes were described as both potentially beneficial and detrimental for the individual and the cooperation in the team. If a successfully implemented diversity management focuses age stereotypes, negative assumptions can be reduced and cooperation in mixed‐age teams can be considered beneficial.
Conclusion
Diversity management as measures against age stereotypes and for mutual acceptance and understanding should include staff from various hierarchical levels of the inpatient setting.
Im ICD-10 wird unter der Diagnose „Schizophrenie“ ein breites Spektrum von Erkrankungen zusammengefasst, die sich hinsichtlich ihrer Symptomatik, dem Verlauf und der Prognose unterscheiden und deren Ursachen noch weitgehend ungeklärt sind. Karl Leonhard unterteilte die Gruppe der endogenen Psychosen und grenzte die zykloiden Psychosen (ZP) von den systematischen und unsystematischen Schizophrenien ab. Diese Klassifikation konnte sich aber nicht international durchsetzen. Ein klinisch auffälliges Symptom schizophrener Patienten ist ein Defizit bei Konzentrationsleistungen und aufmerksamkeitsabhängigen Aufgaben. Dies lässt sich im Elektroenzephalogramm (EEG) mit Hilfe von Ereigniskorrelierten Potentialen (EKP) nachweisen, wobei schizophrene Patienten konstante Abweichungen der frühen EKP-Komponenten aufweisen. Für Patienten mit ZP liegen bislang noch keine Untersuchungen zu gerichteten und ungerichteten Aufmerksamkeitsprozessen vor, obwohl Aufmerksamkeitsstörungen auch für diese Patienten klinisch kennzeichnend sind. Ziel der vorliegenden Doktorarbeit war daher die Untersuchung der Aufmerksamkeitsprozesse bei Patienten mit ZP im Vergleich zu gesunden, alters- und geschlechtsgematchten Kontrollpersonen. Bei den 11 Patienten (18-55 Jahre) war die Diagnose „zykloide Psychose“ im Sinne der Leonhard-Klassifikation gestellt worden, nach dem ICD-10 lag in allen Fällen eine akut polymorphe psychotische Störung (F23) vor. Für die Generierung der ereigniskorrelierten Potentiale und die Berechnung der Differenzpotentiale „Mismatch Negativity“ (MMN) und „Negative Difference“ (Nd) wurde ein akustisches 3-Ton-Oddball-Paradigma durchgeführt. In einer passiven Bedingung hatten die Probanden die Aufgabe, sich auf einen visuellen Reiz zu konzentrieren und die binaural präsentierten Töne nicht zu beachten (MMN). Bei der aktiven Bedingung musste der Zielton erkannt werden und die visuelle Darbietung sollte ignoriert werden (Nd). Während dessen wurde ein kontinuierliches 21-Kanal-EEG aufgezeichnet, die Elektroden wurden nach dem internationalen 10-20-System aufgebracht. Außerdem wurden neuropsychologische Tests (HAWIE, FAS, TMT, WMS-R) durchgeführt und Verhaltensdaten erfasst. Ziel war die Erhebung von repräsentativen kognitiven Parametern zur genauen Charakterisierung der untersuchten Stichprobe und deren Korrelation mit den elektrophysiologischen Daten. Die während des EKP-Paradigmas ermittelten Verhaltensdaten sind kongruent zu den Ergebnissen der neuropsychologischen Tests: die Patienten zeichnen sich durch weniger richtige und mehr falsche Antwortreaktionen sowie signifikant langsamere Reaktionszeiten aus. Für die EEG-Daten wurden in einem Zeitfenster bis 500 ms post stimulus die Komponenten der EKPs der aktiven und passiven Versuchsbedingung bestimmt und vergleichend für ZP und Normprobanden analysiert. Hierbei wurden besonders die MMN, frontozentrales, negatives Potential um 200 ms post stimulus, als Hinweis für ungerichtete und die Nd als ein Marker für die selektive Aufmerksamkeitslenkung auf einen speziellen Reiz untersucht. Hauptbefund der Studie bildet die Übereinstimmung der Amplituden der MMN und Nd der ZP mit denen der Normprobanden. Es konnte weder die bei Schizophrenen typische Reduktion der MMN noch der Nd nachgewiesen werden. Wir nehmen daher an, dass die durch diese Komponenten reflektierten Prozesse ungerichteter und gerichteter Aufmerksamkeit bei Patienten mit ZP nicht beeinträchtigt sind. Dieser Befund unterstützt die Abgrenzung der Zykloiden Psychosen von den schizophrenen Psychosen im Sinne Leonhards, wie er auch schon von anderen Studien nahe gelegt wurde. Auch die zugrunde liegenden EKP-Komponenten wurden untersucht. Dabei fanden sich nur für die N1 und P3 der aktiven Bedingung signifikante Gruppenunterschiede mit kleineren Amplituden (N1 und P3) und längeren Latenzen (P3) bei den ZP. Dies widerspricht den Ergebnissen von Strik, der für ZP eine vergrößerte P3-Amplitude fand und stimmt eher mit Befunden für schizophrene Patienten überein. In dieser Arbeit konnte erstmals nachgewiesen werden, dass die Prozesse ungerichteter und gerichteter Aufmerksamkeit bei Patienten mit zykloider Psychose im Gegensatz zu Patienten mit schizophrener Psychose nicht gestört sind. Allerdings weisen die Potentiale der MMN und Nd eine verlängerte Latenz auf, die auf Schwierigkeiten bei der Reizdiskrimination hinweisen könnten.