Potentiation in phencyclidine-induced serotonin-mediated behaviors after intracerebroventricular administration of 5,7-dihydroxytryptamine in rats

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

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Abstract

Phencyclidine (PCP)-induced behaviors were compared with 5-methoxy-N,N-dimethyltryptamine (5-MeODMT)-and p-chloroamphetamine-induced behaviors in rats pretreated with ritanserin or 5,7-dihydroxytryptamine (5,7-DHT) in order to investigate whether PCP interacts with 5-hydroxytryptamine2 (5-HT2) receptors. Head-twitch and wet-dog shake induced by p-chloroamphetamine, a 5-HT releaser, and head-twitch induced by PCP were blocked completely by pretreatment with ritanserin, a specific 5-HT2 receptor blocker, but other behaviors induced by p-chloroamphetamine, PCP and 5-MeODMT, a 5-HT agonist, were not. The intensity of head-weaving, turning, backpedalling and hind-limb abduction induced by 5-MeODMT and the intensity of head-weaving, turning and head-twitch induced by PCP were markedly greater in the rats 2 weeks after the 5,7-DHT, a 5-HT neurotoxin-injection. Contrarily, 5-HT-mediated behaviors induced by p-chloroamphetamine were attenuated in the 5,7-DHT-treated rats. 5,7-DHT-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 rat brain, but decreased the brain level of 5-HT (41% of control). These results may indicate that PCP as a 5-HT2 agonist induces head-twitch via 5-HT2 receptors, and that PCP induces head-weaving and turning via 5-HT1 receptors and/or some other mechanisms in rats.

Original languageEnglish
Pages (from-to)1139-1146
Number of pages8
JournalJournal of Pharmacology and Experimental Therapeutics
Volume243
Issue number3
Publication statusPublished - 01-12-1987
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Pharmacology

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