Nagatani T, Yamamoto T. Antagonism by propyl-beta-carboline-3-carboxylate of passive avoidance impairment induced by diazepam.
Eur J Pharmacol 1991;
198:109-12. [PMID:
1915575 DOI:
10.1016/0014-2999(91)90571-7]
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Abstract
We investigated the effects of propyl-beta-carboline-3-carboxylate (beta-CCP) on learning and memory tasks in a passive avoidance test in mice to clarify whether beta-CCP is an agonist or antagonist at benzodiazepine (BZP) receptors. At doses up to 10 mg/kg i.v., beta-CCP had no effect on mice in the passive avoidance test. Diazepam impaired passive avoidance behavior and methyl-beta-carboline-3-carboxylate(beta-CCM) enhanced it. beta-CCP blocked these effects of diazepam and beta-CCM in a dose-dependent manner similar to the effect of Ro15-1788. These effects of beta-CCP, which are thought to be mediated by BZP receptors, indicate that beta-CCP is an antagonist in the passive avoidance test.
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