Sep 28, 2017

Muscarinic receptor signaling contributes to atypical antipsychotic drug reversal of the phencyclidine-induced deficit in novel object recognition in rats

Journal of Psychopharmacology
Masanori MiyauchiHerbert Y Meltzer


Enhancement of cholinergic function via muscarinic acetylcholine receptor M1 agonism improves cognition in some schizophrenia patients. Most atypical antipsychotic drugs, including clozapine and its active metabolite, N-desmethylclozapine, and lurasidone, enhance the release of acetylcholine in key brain regions involved in cognition (e.g. hippocampus). We determined the effect of muscarinic acetylcholine receptor M1 stimulation on novel object recognition and its contribution to the ability of atypical antipsychotic drugs to reverse the novel object recognition deficit in rats withdrawn from subchronic phencyclidine, a rodent model of cognitive impairment in schizophrenia. In control rats, the non-specific muscarinic acetylcholine receptor antagonist, scopolamine, and the M1 selective antagonist, VU0255035, induced a novel object recognition deficit, which was reversed by the M1 agonist, AC260584. Scopolamine fully blocked the effect of clozapine and N-desmethylclozapine, but not lurasidone, to restore novel object recognition in subchronic phencyclidine-treated rats. VU0255035 also blocked these effects of clozapine and N-desmethylclozapine, but not lurasidone; however, the blockade was not as complete as that achieved with s...Continue Reading

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Mentioned in this Paper

Antipsychotic Effect
Atypical Antipsychotic [EPC]
Phencyclidine Hydrobromide
Isopto Hyoscine
Cholinergic Synaptic Transmission
Antagonist Muscle Action

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