著者

Kuribara Hisashi

出版者

The Japanese Pharmacological Society

雑誌

The Japanese Journal of Pharmacology (ISSN:00215198)

巻号頁・発行日

vol.64, no.4, pp.273-280, 1994

被引用文献数

3 12

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Behavioral effects of p.o. administration of SUN 8399, a selective 5-HT<SUB>1A</SUB> agonist, on the operant behavior under a MULT VI 1.5 min/FR 5-punishment schedule of food reinforcement and on the ambulatory activity were evaluated in mice, and the characteristics were compared with those of other 5-HT<SUB>1A</SUB> agonists, buspirone and tandospirone, and the benzodiazepine diazepam. Diazepam (3 and 10 mg/kg) significantly increased the punished response without eliciting any significant change in the non-punished response; i.e., showing anticonflict action. SUN 8399 (3-30 mg/kg) and buspirone (1-10 mg/kg) did not significantly change either the punished or non-punished responses. Tandospirone significantly increased the non-punished response at 10 mg/kg, but significantly decreased both the punished and non- punished responses at 30 mg/kg. The single administration of SUN 8399 (10 mg/kg), buspirone (3 and 30 mg/kg) and tandospirone (10 and 30 mg/kg) significantly increased the ambulatory activity, while diazepam tended to decrease it. The ambulation-increasing effect of methamphetamine (2 mg/kg, s.c.) was reduced by buspirone (10 and 30 mg/kg) and tandospirone (10 and 30 mg/kg), but enhanced by diazepam (3 and 10 mg/kg). Buspirone (30 mg/kg), tandospirone (10 and 30 mg/kg) and diazepam (3 and 10 mg/kg) significantly reduced the ambulation-increasing effect of scopolamine (0.5 mg/kg, s.c.). SUN 8399 (3-100 mg/kg) did not modify the effects of either methamphetamine or scopolamine. The present results suggest that 5-HT<SUB>1A</SUB> agonists scarcely show anticonflict action on the Geller-type conflict behavior in mice. However, SUN 8399 possesses different behavioral characteristics from those of the other two 5-HT<SUB>1A</SUB> agonists in terms of interactions with methamphetamine and scopolamine.