title: [Pharmacological studies on Y-8894. (V) Effect on learning and memory in intact and experimentally amnesic rats].
abstract: The effects of Y-8894 on learning and memory were studied using the pole climbing avoidance (PCA) response in intact and experimentally induced amnesic rats. The following results were obtained: A single administration of Y-8894 (2.5 mg/kg, i.p.) to experimentally induced amnesic rats significantly antagonized the decrease in the mean number of PCA responses induced by an electroconvulsive shock (ECS). At a higher dose (10 mg/kg, i.p.), however, this effect was reduced. Repeated administration of Y-8894 (5 mg/kg, i.p.) significantly antagonized the facilitation of the extinction of the PCA response induced by exposure to CO2. Repeated administration of Y-8894 (2.5 mg/kg, i.p.) significantly facilitated the learning of the PCA response in intact rats. At a higher dose (5 mg/kg, i.p.), however, this effect was reduced. A single administration of Y-8894 (5 mg/kg, i.p. and 25 mg/kg, p.o.) significantly delayed the extinction of the PCA response in intact rats. These results suggest that Y-8894 has an ameliorative and facilitative effect on learning and memory in experimentally induced amnesic and intact rats.
mesh_terms: D000547:Amantadine / Q000494:pharmacology; D000647:Amnesia / Q000188:drug therapy*; D000818:Animals; D000697:Central Nervous System Stimulants / Q000494:pharmacology / Q000627:therapeutic use*; D005108:Extinction, Psychological / Q000187:drug effects; D007858:Learning / Q000187:drug effects; D008297:Male; D008568:Memory / Q000187:drug effects; D009025:Morpholines / Q000494:pharmacology / Q000627:therapeutic use*; D051381:Rats; D011919:Rats, Inbred Strains; D013268:Stimulation, Chemical
chemical_list: D000697:Central Nervous System Stimulants; D009025:Morpholines; C045330:sufoxazine; D000547:Amantadine