title: Dopamine receptor mediated antidepressant action of B-HT 920 in mice.
abstract: Possible involvement of dopaminergic (DAergic) system in forced swimming-induced immobility (despair behaviour) was investigated in mice. B-HT 920 (0.05 and 0.1 mg/kg), a post-synaptic DAergic agonist, produced a dose dependent reduction in immobility period, which was sensitive to blockade by haloperidol (0.5 mg/kg) and sulpiride (100 mg/kg). This effect was also blocked by alpha 2 antagonist yohimbine (5 mg/kg). SKF 38393 (5 mg/kg), a D1-DA agonist potentiated the action of B-HT 920. Reserpinization (2 mg/kg, 24 hr prior) produced despair immobility in mice. When a low dose of B-HT 920 (0.05 mg/kg) was given to reserpinized animals, the duration of immobility period was further increased. But on the other hand, a higher dose (0.1 mg/kg) of it reduced reserpine-induced immobility. Desipramine (5 and 10 mg/kg), elicited a dose dependent reduction in the immobility period, which was sensitive to blockade by sulpiride (100 mg/kg). Desipramine (10 mg/kg) showed a diphasic response in combination with B-HT 920, i.e., a potentiation of the response due to a low dose of B-HT 920 (0.05 mg/kg) and an antagonism of the response due to a higher dose of B-HT 920 (0.1 mg/kg), respectively. SKF 38393 (5 mg/kg), potentiated the action of desipramine (5 mg/kg). SKF 38393 (5 mg/kg) further potentiated the action of desipramine (5 mg/kg) and B-HT 920 (0.05 mg/kg). These observations suggests that B-HT 920 reduces behavioural immobility by DAergic mechanism and desipramine also modulates D2-DA receptors in its anti-depressant action.
authors.affiliation: Department of Pharmaceutical Sciences, Panjab University, Chandigarh, India.
authors.forename: A
authors.initials: A
authors.lastname: Sharma
authors.forename: S K
authors.initials: SK
authors.lastname: Kulkarni
mesh_terms: D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000494:pharmacology; D000818:Animals; D000928:Antidepressive Agents / Q000494:pharmacology*; D001381:Azepines / Q000494:pharmacology*; D003891:Desipramine / Q000494:pharmacology; D004347:Drug Interactions; D004924:Escape Reaction / Q000187:drug effects; D005260:Female; D006220:Haloperidol / Q000494:pharmacology; D008297:Male; D051379:Mice; D009043:Motor Activity / Q000187:drug effects*; D011954:Receptors, Dopamine / Q000145:classification / Q000187:drug effects*; D012110:Reserpine / Q000494:pharmacology; D013469:Sulpiride / Q000494:pharmacology; D013550:Swimming; D015016:Yohimbine / Q000494:pharmacology
chemical_list: D000928:Antidepressive Agents; D001381:Azepines; D011954:Receptors, Dopamine; D015016:Yohimbine; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; C024763:talipexole; D013469:Sulpiride; D012110:Reserpine; D006220:Haloperidol; D003891:Desipramine