Hippocampal nNOS inhibition induces an antidepressant-like effect:involvement of 5HT1A receptors
| Autor: | Vinicius A. Hiroaki-Sato, Sâmia R.L. Joca, Amanda J. Sales, Caroline Biojone |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Male
Pyridines Nitric Oxide Synthase Type I Hippocampal formation Pharmacology Swimming/psychology Serotonergic Arginine Hippocampus Piperazines Nitric oxide chemistry.chemical_compound Fluoxetine Stress Psychological/drug therapy Serotonin Antagonists/pharmacology Animals Hippocampus/drug effects Enzyme Inhibitors Piperazines/pharmacology Rats Wistar Receptor Receptor Serotonin 5-HT1A/metabolism Swimming Enzyme Inhibitors/pharmacology Pyridines/pharmacology Antagonist Fluoxetine/pharmacology Nitric Oxide Synthase Type I/metabolism Antidepressive Agents Rats Psychiatry and Mental health Disease Models Animal chemistry Antidepressive Agents/pharmacology Receptor Serotonin 5-HT1A Exploratory Behavior Arginine/analogs & derivatives Antidepressant Exploratory Behavior/drug effects Serotonin Serotonin Antagonists Stress Psychological Behavioural despair test |
| Zdroj: | Hiroaki-Sato, V A, Sales, A J, Biojone, C & Joca, S R L 2014, ' Hippocampal nNOS inhibition induces an antidepressant-like effect : involvement of 5HT1A receptors ', Behavioural Pharmacology, vol. 25, no. 3, pp. 187-96 . https://doi.org/10.1097/FBP.0000000000000035 |
| DOI: | 10.1097/FBP.0000000000000035 |
| Popis: | Systemic as well as hippocampal administration of nNOS inhibitors induces antidepressant-like effects in animal models. However, the mechanisms underlying these effects have not been completely understood. Evidence has suggested that nNOS inhibition increases serotonin signaling in the brain. Moreover, activation of prosencephalic 5HT1A receptors is considered to mediate stress coping and antidepressant effects. On this basis, the aim of this study was to investigate the hypothesis that the antidepressant-like effect induced by nNOS inhibition in the dorsal hippocampus (DH) would involve local serotonergic signaling and 5HT1A receptor activation. Therefore, rats were subjected to the forced swimming test and received microinjections of fluoxetine, NPA (Nω-propyl-L-arginine, selective nNOS inhibitor), WAY100635 (5HT1A antagonist), and vehicle, alone or in combination, into the DH. Exposure to the forced swimming test increased nitric oxide acid levels in the DH. The administration of NPA or fluoxetine in the DH induced dose-dependent antidepressant-like effects. WAY100635 microinjection in the DH did not induce any effect per se, but it counteracted NPA-induced and fluoxetine-induced effects. These results suggest that the antidepressant-like effect induced by the administration of nNOS inhibitors in the DH involves local serotonergic signaling and 5HT1A receptor activation. |
| Databáze: | OpenAIRE |
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