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Einfluss von neuropathischem Schmerz und dessen Behandlung mit D-4F auf die Expression von Abca1 in Ratten (2022)
Popp, Maria Corinna
D-4F, ein ApoA-I-mimetisches Peptid, lindert mechanische Hyperalgesie nach Verabreichung an Nagetiere, die an entzündlichen und neuropathischen Schmerzen leiden. D-4F fängt proalgetische oxidierte Lipide ab – als ein solches entzündungshemmendes Medikament – ​​aktiviert aber auch ATP-bindende Kassettentransporter (Abca1 und Abcg1) – als ein solches anti-atherosklerotisches Medikament. Ziel dieser Arbeit war es, den Einfluss von Neuropathie und deren Behandlung mit D-4F auf die Expression von Abca1/Abcg1 sowie Zytokinen zu untersuchen.
Interaction of brain 5-HT synthesis deficiency, chronic stress and sex differentially impact emotional behavior in Tph2 knockout mice (2015)
Gutknecht, Lise ; Popp, Sandy ; Waider, Jonas ; Sommerlandt, Frank M. J. ; Göppner, Corinna ; Post, Antonia ; Reif, Andreas ; van den Hove, Daniel ; Strekalova, Tatyana ; Schmitt, Angelika ; Colaςo, Maria B. N. ; Sommer, Claudia ; Palme, Rupert ; Lesch, Klaus-Peter
Rationale While brain serotonin (5-HT) function is implicated in gene-by-environment interaction (GxE) impacting the vulnerability-resilience continuum in neuropsychiatric disorders, it remains elusive how the interplay of altered 5-HT synthesis and environmental stressors is linked to failure in emotion regulation. Objective Here, we investigated the effect of constitutively impaired 5-HT synthesis on behavioral and neuroendocrine responses to unpredictable chronic mild stress (CMS) using a mouse model of brain 5-HT deficiency resulting from targeted inactivation of the tryptophan hydroxylase-2 (Tph2) gene. Results Locomotor activity and anxiety- and depression-like behavior as well as conditioned fear responses were differentially affected by Tph2 genotype, sex, and CMS. Tph2 null mutants (Tph2\(^{−/−}\)) displayed increased general metabolism, marginally reduced anxiety- and depression-like behavior but strikingly increased conditioned fear responses. Behavioral modifications were associated with sex-specific hypothalamic-pituitary-adrenocortical (HPA) system alterations as indicated by plasma corticosterone and fecal corticosterone metabolite concentrations. Tph2\(^{−/−}\) males displayed increased impulsivity and high aggressiveness. Tph2\(^{−/−}\) females displayed greater emotional reactivity to aversive conditions as reflected by changes in behaviors at baseline including increased freezing and decreased locomotion in novel environments. However, both Tph2\(^{−/−}\) male and female mice were resilient to CMS-induced hyperlocomotion, while CMS intensified conditioned fear responses in a GxE-dependent manner. Conclusions Our results indicate that 5-HT mediates behavioral responses to environmental adversity by facilitating the encoding of stress effects leading to increased vulnerability for negative emotionality.
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