In the conditioned place preference test, phencyclidine (PCP) produces place aversion in naive rats, whereas PCP produces place preference in rats treated with PCP repeatedly. Although the PCP-induced place aversion is thought to involve the se-rotonergic system, the mechanisms of the PCP-induced place preference are unclear. We investigated whether the dopami-nergic system is involved in place preference induced by PCP in mice repeatedly treated with PCP, because it is well known that the dopaminergic system plays an important role in the rewarding effect of drugs. PCP (2–8 mg/kg s.c.) induced a dose-dependent place aversion in naive mice, whereas PCP (2–8 mg/kg s.c.) induced a dose-dependent place preference in mice pretreated with PCP (10 mg/kg/day s.c.) for 28 days. The place preference induced by PCP (8 mg/kg s.c.) was attenu
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