Involvement of dopaminergic system in phencyclidine-induced place preference in mice pretreated with phencyclidine repeatedly - PubMed (original) (raw)

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PMID: 9655840

Involvement of dopaminergic system in phencyclidine-induced place preference in mice pretreated with phencyclidine repeatedly

Y Noda et al. J Pharmacol Exp Ther. 1998 Jul.

Abstract

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 serotonergic system, the mechanisms of the PCP-induced place preference are unclear. We investigated whether the dopaminergic 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 attenuated significantly by alpha-methyl-rho-tyrosine (100 mg/kg i.p.), a tyrosine hydroxylase inhibitor, 6-hydroxydopamine (100 micrograms/mouse i.c.v.), a dopaminergic neurotoxin, and R-(+)-7-chloro-8-hydroxy-3-methyl-1-phenyl-2,3,4,5-tetrahydro-1H-3-benza zepine (0.5 mg/kg s.c.), a dopamine D1 receptor antagonist. These agents themselves produced neither the place preference nor aversion. In contrast to the attenuating effects of these agents, N-(2-chloroethyl)-N-ethyl-2-bromobenzylamine (30 mg/kg i.p.), a noradrenergic neurotoxin, ritanserin (1 mg/kg i.p.), a serotonin2 receptor antagonist, and (-) sulpiride (50 and 100 mg/kg i.p.), a dopamine D2 receptor antagonist, failed to affect the PCP-induced place preference. In mice pretreated with methamphetamine (1 mg/kg/day s.c.) for 14 days, PCP (8 mg/kg s.c.) induced the place preference, but not aversion. These results demonstrate that the PCP-induced place preference depends on dopaminergic, but not on serotonergic and noradrenergic, neuronal systems and suggest a role for D1 receptors in the mediation of the PCP-induced place preference.

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Involvement of dopaminergic system in phencyclidine-induced place preference in mice pretreated with phencyclidine repeatedly - PubMed (original) (raw)