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Nabeshima, T. et al.

Effects of 5-HT2 receptor antagonist on cycloheximide-induced amnesia in mice.

A role played by serotonergic neuronal system in cycloheximide (CXM)-induced amnesia was studied in mice using a step-down passive avoidance task. CXM (30 mg/kg SC) given immediately after training caused impairment of memory. Nonselective serotonin (5-HT) antagonist methysergide and selective 5-HT2 antagonist ritanserin significantly attenuated impairment of memory caused by CXM. 5-HT1 antagonist (+/-)-pindolol had no effect on CXM-induced amnesia. The antiamnesic effect of ritanserin on CXM-induced amnesia was antagonized by 5-HT (ICV), but not by nonselective 5-HT agonist 5-methoxy-N,N-dimethyltryptamine and 5-HT1A selective agonist 8-hydroxy-2-(di-n-propylamino)tetralin at the dose level which did not cause the memory disruption. Scopolamine antagonized the antiamnesic effects of methysergide and ritanserin on CXM-induced amnesia. These results suggest that 5-HT2 receptors and cholinergic neuronal system may play an important role in memory formation.[1]

References

Effects of 5-HT2 receptor antagonist on cycloheximide-induced amnesia in mice. Nabeshima, T., Itoh, K., Kawashima, K., Kameyama, T. Pharmacol. Biochem. Behav. (1989) [Pubmed]

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