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Institute
- Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie (468) (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)
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- Johns Hopkins University School of Medicine (1)
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- Translationale soziale Neurowissenschaften (1)
ResearcherID
- N-8985-2015 (1)
While there is abounding literature on virus-induced pathology in general and coronavirus in particular, recent evidence accumulates showing distinct and deleterious brain affection. As the respiratory tract connects to the brain without protection of the blood–brain barrier, SARS-CoV-2 might in the early invasive phase attack the cardiorespiratory centres located in the medulla/pons areas, giving rise to disturbances of respiration and cardiac problems. Furthermore, brainstem regions are at risk to lose their functional integrity. Therefore, long-term neurological as well as psychiatric symptomatology and eventual respective disorders cannot be excluded as evidenced from influenza-A triggered post-encephalitic Parkinsonism and HIV-1 triggered AIDS–dementia complex. From the available evidences for coronavirus-induced brain pathology, this review concludes a number of unmet needs for further research strategies like human postmortem brain analyses. SARS-CoV-2 mirroring experimental animal brain studies, characterization of time-dependent and region-dependent spreading behaviours of coronaviruses, enlightening of pathological mechanisms after coronavirus infection using long-term animal models and clinical observations of patients having had COVID-19 infection are calling to develop both protective strategies and drug discoveries to avoid early and late coronavirus-induced functional brain disturbances, symptoms and eventually disorders. To fight SARS-CoV-2, it is an urgent need to enforce clinical, molecular biological, neurochemical and genetic research including brain-related studies on a worldwide harmonized basis.
Auswirkungen der Genpolymorphismen ASIC1, BDNF und NPSR1 auf die Antizipationsphase aversiver Reize
(2024)
In dieser Arbeit wurden einerseits die Antizipationsphasen von aversiven gegenüber neutralen Reizen anhand von Messungen der Hautleitfähigkeit und der Startle-Reaktion untersucht. Andererseits wurde die Hautleitfähigkeit auch während der Präsentation aversiver und neutraler Reize mit dem Ziel gemessen, signifikante Unterschiede festzustellen. Insbesondere wurden die Auswirkungen der Allele der Gene ASIC1 und der Interaktion der Genallele BDNF und NPSR1 betrachtet.
Ziel der vorliegenden Arbeit war es, den Einfluss der Risikogene auf die physiologische Angstreaktion und die subjektive Angstwahrnehmung zu untersuchen. Hierzu wurden den genotypisierten Probanden aversive und neutrale Videos präsentiert. Vor jedem Video erfolgte die Ankündigung, ob es sich um ein neutrales oder aversives Video handelt, wodurch bei Letzterem im Allgemeinen antizipatorische Angst – Erwartungsangst – hervorgerufen wird.
Im Vergleich der Antizipationsphase vor Darbietung aversiver Videos mit der Antizipationsphase vor neutralen Videos konnte eine erhöhte Startle-Amplitude gemessen werden. Jedoch konnte weder anhand der Veränderung der Hautleitfähigkeit noch anhand der Startle-Amplitude ein signifikanter Unterschied bei Trägern und Nicht- Trägern der Risikogenallelen in der Antizipationsphase festgestellt werden. Während der Präsentation der Videos konnte für die aversiven Videos im Vergleich zu den neutralen eine erhöhte Hautleitfähigkeit gemessen werden. Ebenfalls konnte bei der Darbietung von aversiven Videos bei den Trägern der Genallel-Interaktion NPSR1 AT/TT * BDNF GG und den Trägern des Risikogenallels ASIC1TT eine erhöhte Hautleitfähigkeit gemessen werden. So konnte mit den Ergebnissen dieser Arbeit belegt werden, dass Antizipationsangst auslösbar und anhand der Startle-Amplitude messbar ist.
Um Antizipationsangst festzustellen oder diese bei Risikogenallel-Träger zu untersuchen, waren die Ergebnisse bezüglich der Hautleitfähigkeit jedoch weniger aussagekräftig als erwartet.
Allgemein konnte die Interaktion NPSR1 AT/TT * BDNF GG und ASIC1 TT als Risikogenallele bezüglich einer verstärken Reaktion auf aversive Reize bestätigt werden. Weitere Studien sind notwendig, um die genetische Komponente von Angst und damit auch von Angsterkrankungen näher zu beleuchten, damit zukünftige Diagnostik- und Therapieansätze präzise entwickelt werden können.
Background
With upcoming therapeutic interventions for patients with primary progressive aphasia (PPA), instruments for the follow-up of patients are needed to describe disease progression and to evaluate potential therapeutic effects. So far, volumetric brain changes have been proposed as clinical endpoints in the literature, but cognitive scores are still lacking. This study followed disease progression predominantly in language-based performance within 1 year and defined a PPA sum score which can be used in therapeutic interventions.
Methods
We assessed 28 patients with nonfluent variant PPA, 17 with semantic variant PPA, 13 with logopenic variant PPA, and 28 healthy controls in detail for 1 year. The most informative neuropsychological assessments were combined to a sum score, and associations between brain atrophy were investigated followed by a sample size calculation for clinical trials.
Results
Significant absolute changes up to 20% in cognitive tests were found after 1 year. Semantic and phonemic word fluency, Boston Naming Test, Digit Span, Token Test, AAT Written language, and Cookie Test were identified as the best markers for disease progression. These tasks provide the basis of a new PPA sum score. Assuming a therapeutic effect of 50% reduction in cognitive decline for sample size calculations, a number of 56 cases is needed to find a significant treatment effect. Correlations between cognitive decline and atrophy showed a correlation up to r = 0.7 between the sum score and frontal structures, namely the superior and inferior frontal gyrus, as well as with left-sided subcortical structures.
Conclusion
Our findings support the high performance of the proposed sum score in the follow-up of PPA and recommend it as an outcome measure in intervention studies.
Background
Disentangling the etiology of common, complex diseases is a major challenge in genetic research. For bipolar disorder (BD), several genome-wide association studies (GWAS) have been performed. Similar to other complex disorders, major breakthroughs in explaining the high heritability of BD through GWAS have remained elusive. To overcome this dilemma, genetic research into BD, has embraced a variety of strategies such as the formation of large consortia to increase sample size and sequencing approaches. Here we advocate a complementary approach making use of already existing GWAS data: a novel data mining procedure to identify yet undetected genotype–phenotype relationships. We adapted association rule mining, a data mining technique traditionally used in retail market research, to identify frequent and characteristic genotype patterns showing strong associations to phenotype clusters. We applied this strategy to three independent GWAS datasets from 2835 phenotypically characterized patients with BD. In a discovery step, 20,882 candidate association rules were extracted.
Results
Two of these rules—one associated with eating disorder and the other with anxiety—remained significant in an independent dataset after robust correction for multiple testing. Both showed considerable effect sizes (odds ratio ~ 3.4 and 3.0, respectively) and support previously reported molecular biological findings.
Conclusion
Our approach detected novel specific genotype–phenotype relationships in BD that were missed by standard analyses like GWAS. While we developed and applied our method within the context of BD gene discovery, it may facilitate identifying highly specific genotype–phenotype relationships in subsets of genome-wide data sets of other complex phenotype with similar epidemiological properties and challenges to gene discovery efforts.
Background
Temporal lobe epilepsy (TLE) with hippocampal sclerosis (HS) is a common pharmaco-resistant epilepsy referred for adult epilepsy surgery. Though associated with prolonged febrile seizures (FS) in childhood, the neurobiological basis for this relationship is not fully understood and currently no preventive or curative therapies are available. DNA methylation, an epigenetic mechanism catalyzed by DNA methyltransferases (DNMTs), potentially plays a pivotal role in epileptogenesis associated with FS. In an attempt to start exploring this notion, the present cross-sectional pilot study investigated whether global DNA methylation levels (5-mC and 5-hmC markers) and DNMT isoforms (DNMT1, DNMT3a1, and DNMT3a2) expression would be different in hippocampal and neocortical tissues between controls and TLE patients with or without a history of FS.
Results
We found that global DNA methylation levels and DNMT3a2 isoform expression were lower in the hippocampus for all TLE groups when compared to control patients, with a more significant decrease amongst the TLE groups with a history of FS. Interestingly, we showed that DNMT3a1 expression was severely diminished in the hippocampus of TLE patients with a history of FS in comparison with control and other TLE groups. In the neocortex, we found a higher expression of DNMT1 and DNMT3a1 as well as increased levels of global DNA methylation for all TLE patients compared to controls.
Conclusion
Together, the findings of this descriptive cross-sectional pilot study demonstrated brain region-specific changes in DNMT1 and DNMT3a isoform expression as well as global DNA methylation levels in human TLE with or without a history of FS. They highlighted a specific implication of DNMT3a isoforms in TLE after FS. Therefore, longitudinal studies that aim at targeting DNMT3a isoforms to evaluate the potential causal relationship between FS and TLE or treatment of FS-induced epileptogenesis seem warranted.
Valence framing effects refer to inconsistent choice preferences in response to positive versus negative formulation of mathematically equivalent outcomes. Here, we manipulate valence framing in a two-alternative forced choice dictator game using gains and losses as frames to investigate the cognitive mechanisms underlying valence framing. We applied a Drift-Diffusion Model (DDM) to examine whether gain (i.e., “take” money) and loss (i.e., “give” money) frames evoke a cognitive bias as previous research did not consistently reveal framing effects using reaction times and response frequency as dependent variables. DDMs allow decomposing the decision process into separate cognitive mechanisms, whereby a cognitive bias was repeatedly associated with a shift in the starting point of the model. Conducting both a laboratory (N = 62) and an online study (N = 109), female participants allocated money between themselves and another person in a prosocial or selfish way. In each study, one group was instructed to give money (give frame), the other to take money (take frame). Consistent with previous studies, no differences were found in response times and response frequencies. However, in both studies, substantial bias towards the selfish option was found in the take frame groups, captured by the starting point of the DDM. Thus, our results suggest that valence framing induces a cognitive bias in decision processing in women, even when no behavioral differences are present.
Risperidone is commonly used to treat different psychiatric disorders worldwide. Knowledge on dose–concentration relationships of risperidone treatment in children and adolescents with schizophrenia or other psychotic disorders is, however, scarce and no age-specific therapeutic ranges have been established yet. Multicenter data of a therapeutic drug monitoring service were analyzed to evaluate the relationship between risperidone dose and serum concentration of the active moiety (risperidone (RIS) plus its main metabolite 9-hydroxyrisperidone (9-OH-RIS)) in children and adolescents with psychotic disorders. Patient characteristics, doses, serum concentrations and therapeutic outcomes were assessed by standardized measures. The study also aimed to evaluate whether the therapeutic reference range for adults (20–60 ng/ml) is applicable for minors. In the 64 patients (aged 11–18 years) included, a positive correlation between daily dose and the active moiety (RIS\(_{am}\)) concentration was found (r\(_s\) = 0.49, p = 0.001) with variation in dose explaining 24% (r\(_s\)\(^2\) = 0.240) of the variability in serum concentrations. While the RIS\(_{am}\) concentration showed no difference, RIS as well 9-OH-RIS concentrations and the parent to metabolite ratio varied significantly in patients with co-medication of a CYP2D6 inhibitor. Patients with extrapyramidal symptoms (EPS) had on average higher RIS\(_{am}\) concentrations than patients without (p = 0.05). Considering EPS, the upper threshold of the therapeutic range of RIS\(_{am}\) was determined to be 33 ng/ml. A rough estimation method also indicated a possibly decreased lower limit of the preliminary therapeutic range in minors compared to adults. These preliminary data may contribute to the definition of a therapeutic window in children and adolescents with schizophrenic disorders treated with risperidone. TDM is recommended in this vulnerable population to prevent concentration-related adverse drug reactions.
Schwangerschaft und Stillzeit gehen mit erheblichen metabolischen Veränderungen des mütterlichen Organismus einher. Bis dato ist über die Pharmakokinetik von Psychopharmaka in dieser Zeit wenig bekannt. In unserer naturalistischen Beobachtungsstudie untersuchten wir 61 Frauen hinsichtlich der Dynamik psychotroper Medikamente innerhalb der Schwangerschaft und Stillzeit im Serum und teils in der Muttermilch. Zudem erhoben wir Eckdaten der Entwicklung der exponierten Kinder innerhalb des ersten Lebensjahres.
Bis auf Citalopram stellten wir bei allen analysierten Medikamenten Spiegelabfälle in der Schwangerschaft fest: vom ersten zum zweiten Trimenon fielen die Spiegel bei Escitalopram, Sertralin, Duloxetin, Amitriptylin, Clomipramin und Quetiapin. Während wir in der Spätschwangerschaft bei Escitalopram, Venlafaxin, Clomipramin, Mirtazapin, Aripiprazol und Quetiapin eine weitere Reduktion der Serumkonzentrationen protokollierten, blieben die Spiegel von Amitriptylin stabil, die Sertralin-Spiegel erholten sich sogar partiell. Citalopram zeigte keine Änderung der Serumspiegel. Direkt postpartal kam es bei allen Medikamenten zu einem Spiegelanstieg. Im postpartalen Verlauf zeigten die einzelnen Medikamente widersprüchliche Dynamiken. Hohe Penetrationsraten in die Muttermilch wiesen Escitalopram und Venlafaxin auf; Duloxetin, Clomipramin und Quetiapin gingen kaum bzw. nicht in die Muttermilch über. Wir fanden keine signifikanten Unterschiede zwischen in utero nicht exponierten zu exponierten Kindern bezüglich Geburtsparametern wie Schwangerschaftswoche, Körpermaße oder APGAR-Wert. Während die nicht exponierten Kinder vermehrt unter leichten Auffälligkeiten direkt postpartal litten, wiesen die exponierten Neugeborenen mehr mittelschwere Auffälligkeiten auf. Hinsichtlich der Entwicklung innerhalb des ersten Lebensjahres (gemessen an groben Entwicklungsmeilensteinen) ergaben sich keine signifikanten Unterschiede.
Im klinischen Alltag trägt das Therapeutische Drug Monitoring als indirekte Methode zur Kontrolle aller an der Metabolisierung beteiligten Faktoren enorm zur Steigerung der Sicherheit und Effektivität der individuellen Pharmakotherapie bei. Die pharmakokinetische Dynamik fällt bei manchen Medikamenten jedoch interindividuell sehr unterschiedlich aus (insbesondere bei Sertralin); hier stellt eine initiale Genotypisierung der Cytochrom-P450-Enzyme ein großes Potential dar, um bereits zu Beginn einer Schwangerschaft über die voraussichtliche pharmakokinetische Dynamik im Bilde zu sein und möglicher Unter- bzw. Überdosierung mit potentiell fruchtschädigender Wirkung vorbeugen zu können.
Die ängstliche Depression stellt einen Subtypus der Depression dar, der noch nicht ausreichend erforscht ist und somit eine Herausforderung im klinischen Alltag darstellt. Laut der bisherigen Literatur sind genetische Unterschiede sowie Kindheitstraumatisierungen an der Pathophysiologie von Depressionen beteiligt und mitverantwortlich für die Ausprägung des Subtypus ängstliche Depression.
In dieser Untersuchung wurde erforscht, ob es unterschiedliche Genexpressionslevel des Gens NR3C1 zwischen ängstlich-depressiven und nicht-ängstlich-depressiven Personen gibt. Zusätzlich wurde geprüft, ob Kindheitstraumatisierungen einen weiteren Einfluss auf die Genexpression der beiden Subtypen der Depression haben.
Es zeigte sich, dass ängstlich-depressive Personen in Woche 1 bis 4 höhere HAM-D-Summenwerte erzielten, mit zusätzlichen Kindheitstraumatisierungen wurden die höchsten HAM-D-Werte festgestellt. Diese Gruppe hatte gehäuft Kindheitstraumata im Fragebogen angegeben, die Traumata Emotionale Misshandlung und Körperliche Vernachlässigung kamen signifikant häufiger vor.
Anhand dieser durchgeführten Studie konnten zusammengefasst werden, dass sich die Genexpressionslevel von NR3C1 zwischen den beiden Subtypen als unterschiedlich erwies. Zusätzlich scheinen die beiden Kindheitstraumata Emotionale Misshandlung und Körperliche Vernachlässigung einen weiteren Einfluss auf die Genexpression von NR3C1 zu haben.
Die unterschiedliche Genexpression von NR3C1 deutet auf verschiedene Funktionsweisen des GR zwischen den Subtypen hin. Dies könnte für die Verlaufsbeurteilung und Therapieansätze der Erkrankung von Bedeutung sein. Die häufiger vorkommenden Kindheitstraumatisierungen bei ängstlich-depressiven Personen können als ein pathophysiologischer Baustein für die Entstehung der ängstlichen Depression gesehen werden. Daher ist es umso wichtiger, das Überprüfen von erlebten Kindheitstraumata bei initialer Befragung in den klinischen Alltag mitaufzunehmen. Da auch der Depressionsschweregrad durch Kindheitstraumatisierungen in dieser Studie zunahm, ergeben sich daraus mögliche Konsequenzen für die therapeutische Planung.
Neural responses to a working memory task in acute depressed and remitted phases in bipolar patients
(2023)
(1) Cognitive impairments such as working memory (WM) deficits are amongst the most common dysfunctions characterizing bipolar disorder (BD) patients, severely contributing to functional impairment. We aimed to investigate WM performance and associated brain activation during the acute phase of BD and to observe changes in the same patients during remission. (2) Frontal brain activation was recorded using functional near-infrared spectroscopy (fNIRS) during n-back task conditions (one-back, two-back and three-back) in BD patients in their acute depressive (n = 32) and remitted (n = 15) phases as well as in healthy controls (n = 30). (3) Comparison of BD patients during their acute phase with controls showed a trend (p = 0.08) towards lower dorsolateral prefrontal cortex (dlPFC) activation. In the remitted phase, BD patients showed lower dlPFC and ventrolateral prefrontal cortex (vlPFC) activation (p = 0.02) compared to controls. No difference in dlPFC and vlPFC activation between BD patients’ phases was found. (4) Our results showed decreased working memory performance in BD patients during the working memory task in the acute phase of disease. Working memory performance improved in the remitted phase of the disease but was still particularly attenuated for the more demanding conditions.