Abstract
1. The effects of dopamine agonists on the immobility time in mice were examined. 2. Apomorphine (APO), bupropion (BUP), bromocriptine (BRC) and quinpirole but not SKF 38393 elicited anti-immobility effect. The effect of the agonists was decreased by the D-2 antagonist sulpiride but not by the D-1 antagonist SCH 23390. 3. In animals pretreated with reserpine, the anti-immobility effects of APO and quinpirole were potentiated, while the response of BPU was decreased and that of BRC was not changed. 4. It is concluded that D-2 dopamine receptors are involved in the anti-immobility effects of dopaminergic agents, D-2 dopamine receptors may become hypersensitive by reserpine and BUP exerts its response through indirect dopaminergic if mechanism.
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