Potentiation of phencyclidine- and serotonin agonist-induced behaviors after administration of p-chloroamphetamine in rats

T. Nabeshima, K. Yamaguchi, K. Ishikawa, H. Furukawa, T. Kameyama

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Phencyclidine (PCP)-induced behaviors were compared with 5-methoxy-N,Ndimethyltryptamine (5-MeODMT)- and p-chloroamphetamine-induced behaviors in rats pretreated with ritanserin, pindolol, or p-chloroamphetamine in order to investigate whether PCP interacts with 5-hydroxytryptamine1 (5-HT1) and 5-HT2 receptors. The intensity of head-weaving, forepaw treading and hind-limb abduction induced by 5-MeODMT, a 5-HT agonist, and of head-weaving induced by p-chloroamphetamine, a 5-HT releaser, or PCP were decreased by pretreatment with pindolol, a 5-HT1 receptor blocker. Head-twitch and wet-dog shake induced by p-chloroamphetamine and head-twitch induced by PCP were completely blocked by pretreatment with ritanserin, a selective 5-HT2 receptor blocker. The intensity of head-weaving, turning, forepaw treading, hind-limb abduction and Straub tail induced by 5-MeODMT and the intensity of head-twitch, turning and backpedalling induced by PCP were markedly increased in the rats 13 days after treatment with a high dose of p-chloroamphetamine. In addition, the intensity of 5-HT-mediated behaviors induced by 5-MeODMT and PCP in the p-chloroamphetamine-pretreated rats decreased after pretreatment with pindolol or ritanserin. By contrast, 5-HT-mediated behaviors induced by p-chloroamphetamine were attenuated in the p-chloroamphetamine-pretreated rats. p-Chloroamphetamine treatment increased the number of 5-HT1 ([3H]5-HT), 5-HT2 ([3H]ketanserin) and PCP ([3H]PCP) binding sites in the synaptic membrane of the rat brain, but decreased the brain levels of 5-HT and its metabolite. These results indicate the PCP induces head-weaving, turning and backpedalling via 5-HT1 receptors and/or some other mechanisms and that, as a 5-HT2 agonist, PCP induces head-twitch via 5-HT2 receptors in rats.

Original languageEnglish
Pages (from-to)37-61
Number of pages25
JournalResearch Communications in Substances of Abuse
Issue number1
Publication statusPublished - 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)


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