RESUMO
Background: At present, there is an escalating concern regarding possible role of 5-HT3 receptor in psychopharmacology and the therapeutic potential of their antagonists. Moreover, inclusion of 5-HT3 receptor antagonist may curtail the antidepressant-induced LTP decrease causing memory deficits, thereby improving efficacy of current antidepressants. Aim and Objective: This study aims to evaluate the antidepressant activity of 5-HT3 antagonist, that is, ondansetron (OND) in rodent models of depression. Materials and Methods: Male Swiss albino mice (20–30 g bw) and Wistar rats (100–200 g bw) were divided into five groups. Animals received either OND p.o. (0.1, 0.5 and 1 mg/kg), venlafaxine (10 mg/kg), or vehicle (1 ml distilled water p.o.) in control. Tail suspension and forced swim test were used to evaluate the effects of drugs and control after 60 min of their administration. Furthermore, assessment of locomotor activity (LA) was done by photoactometer after 24 h of drug administration. Results: Ondansetron exhibited significant antidepressants activity (P < 0.05) in rodent models. However, LA was not significantly altered by OND. Conclusion: Ondansetron exhibited significant antidepressant activity in rodent models hence paving the way for exploration of 5-HT3 receptor antagonist in future researches and its therapeutic application in depression.