Abstract
Chronic administration of haloperidol (0.5 mg/kg, s.c.) during early postnatal life did not modify the effects produced by a small dose of apomorphine (0.02 mg/kg, s.c.) on the locomotor activity of adult rats; conversely, the reduction of locomotion induced by a large dose of apomorphine (1 mg/kg, s.c.) was much more kared in haloperidol-pretreated rat than in saline-pretreated ones. The differentail ontogeny of dopamine auto- and postsynaptic receptors could be partly responsible for the different influence of postnatal treatment with haloperidol on the responsiveness of the adult to small and large doses of apomorphine.
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