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pubmed-article:2356212pubmed:abstractTextThe nicotinic antagonist mecamylamine (2.5 and 5 mg/kg/IP) depressed both active (shuttle-box) and passive (step-through) avoidance learning in mice of the DBA/2 strain. The nootropic drug oxiracetam (50 and 100 mg/kg/IP) improved acquisition in the multitrial active avoidance test, but had no effect on one-trial passive avoidance learning. When the two drugs were combined, oxiracetam did not counteract mecamylamine-induced impairment of passive avoidance learning, even if it maintained a facilitating action on shuttle-box avoidance acquisition in mice receiving the nicotinic receptor blocker. Prevention of mecamylamine-induced shuttle-box avoidance depression by oxiracetam indicates that central nicotinic mechanisms are probably involved in the improving effects exerted by nootropic drugs on learning.lld:pubmed
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pubmed-article:2356212pubmed:articleTitleOxiracetam prevents mecamylamine-induced impairment of active, but not passive, avoidance learning in mice.lld:pubmed
pubmed-article:2356212pubmed:affiliationIstituto di Psicobiologia e Psicofarmacologia, CNR, Roma, Italy.lld:pubmed
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