Abstract
The aim of the present study was to investigate the effect of antidepressant drugs (characterized by a different mechanism of action), administered jointly with the selective 5-HT 6 receptor antagonist N-[3,5-dichloro-2-(methoxy)phenyl]-4-(methoxy)-3-(1-piperazinyl)benzenesulfonamide (SB-399885), in the forced swim test in rats. All the compounds under study were given intraperitoneally in doses which did not shorten the immobility time of rats. Co-administration of SB-399885 (3 mg/kg) and imipramine (20 mg/kg), desipramine (20 mg/kg), bupropion (5 mg/kg) or moclobemide (20 mg/kg), produced significant anti-immobility action, whereas SB-399885 (3 mg/kg) given jointly with citalopram (20 mg/kg) did not affect immobility time. None of the compounds studied, given alone or jointly, increased the general activity of rats measured in the open field test. The obtained results indicate that the blockade of 5-HT 6 receptors may facilitate the anti-immobility effect of imipramine, desipramine, bupropion or moclobemide in the forced swim test.
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