The effect of ipsapirone, a partial agonist at 5-HT 1A receptors, and of idazepam on punished operant responding was studied in rats injected intracerebroventricularly with 150 μg 5,7-dihydroxytryptamine to deplete brain serotonin or pretreated with ( S )-WAY 100135 ( N -tert-butyl 3-4-(2-methoxyphenyl)piperazin-1-yl-2-phenylpropanamide dihydrochloride), an antagonist at 5-HT 1A receptors. 5,7-Dihydroxytryptamine markedly depleted brain serotonin and caused a sustained increase in punished responding with no effect on rates of unpunished responding. Rates of punished responding returned to control values about 2 weeks after 5,7-dihydroxytryptamine. At doses ranging from 2.5 to 10 mg/kg s.c. ipsapirone significantly increased the rates of punished responding in sham-operated rats but had no effect in animals which had received 5,7-dihydroxytryptamine. At 5 and 10 mg/kg ipsapirone reduced unpunished responding similarly in sham-operated and 5,7-dihydroxytryptamine-treated rats. Diazepam 2.5 mg/kg i.p. significantly increased punished responding and reduced rates of unpunished responding similarly in sham-operated and in 5,7-dihydroxytryptamine-treated animals. At 3 and 10 mg/kg ( S )-WAY 100135 did not modify punished or unpunished responding but at 10 mg/kg it completely antagonized the effect of 5 mg/kg s.c. ipsapirone on unpunished and punished responding. The results suggest that ipsapirone releases behaviour that is suppressed by punishment by stimulating presynaptic 5-HT 1A receptors.
European Journal of Pharmacology – Elsevier
Published: Sep 25, 1995
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