The role of nitric oxide-cGMP pathway in selegiline antidepressant-like effect in the mice forced swim test

Pharmacological Reports : PR
Sattar OstadhadiAhmad-Reza Dehpour

Abstract

Considering the pivotal role of nitric oxide (NO) pathway in depressive disorders, the aim of the present study was to investigate the antidepressant-like effect of selegiline in mice forced swimming test (FST), and possible involvement of NO-cyclic guanosine monophosphate (cGMP) pathway in this action. After assessment of locomotor activity in open-field test, mice were forced to swim individually and the immobility time of the last 4min was evaluated. All drugs were given intraperitoneally (ip). Selegiline (10mg/kg) decreased the immobility time in the FST similar to fluoxetine (20mg/kg). Pretreatment with l-arginine (NO precursor, 750mg/kg) or sildenafil (a phosphodiesterase 5 inhibitor, 5mg/kg) significantly reversed the selegiline anti-immobility effect. Sub-effective dose of selegiline (1mg/kg) showed a synergistic antidepressant effect with NG-nitro-l-arginine methyl ester (L-NAME, inhibitor of NO synthase, 10mg/kg) or 7-nitroindazole (specific neuronal NO synthase inhibitor, 30mg/kg), but not with aminoguanidine (specific inducible NO synthase inhibitor, 50mg/kg). Pretreatment of mice with methylene blue (an inhibitor of NO synthase and soluble guanylyl cyclase, 10mg/kg) significantly produced a synergistic response wit...Continue Reading

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