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Antagonism of the nitric oxide synthase inhibitor, L-NAME, of the effects of phencyclidine on latent inhibition in taste aversion conditioning

Journal article
Authors Daniel Klamer
Erik Pålsson
Caroline Wass
Trevor Archer
Jörgen Engel
Lennart Svensson
Published in Behav Brain Res
Volume 161
Issue 1
Pages 60-8
Publication year 2005
Published at Department of Psychology
Institute of Physiology and Pharmacology, Dept of Pharmacology
Pages 60-8
Language en
Keywords Analysis of Variance, Animals, Avoidance Learning/*drug effects, Behavior, Animal, Central Nervous System Stimulants/pharmacology, Conditioning, Operant/drug effects, Dextroamphetamine/pharmacology, Dose-Response Relationship, Drug, Drinking/drug effects, Drug Interactions, Enzyme Inhibitors/*pharmacology, *Inhibition (Psychology), Male, NG-Nitroarginine Methyl Ester/*pharmacology, Phencyclidine/*pharmacology, Rats, Rats, Sprague-Dawley, Taste/*drug effects
Subject categories Physiology


Latent inhibition (LI) is a behavioural procedure used to evaluate the potential propsychotic and antipsychotic properties of psychoactive drugs. In the present study, a conditioned taste aversion (CTA) procedure was used to investigate the effects of the nitric oxide (NO) synthase inhibitor, N(G)-nitro-L-arginine methyl ester (L-NAME), and the psychotomimetic drugs, phencyclidine (PCP) and d-amphetamine (d-AMP) on LI. PCP (2 mg/kg) and d-AMP (0.5 mg/kg) were both found to enhance LI in this procedure. The effect of d-AMP on LI was less pronounced and this drug also caused a weak disruption of taste aversion conditioning. Pretreatment with L-NAME (10 mg/kg) blocked the LI enhancing effect of PCP on LI but not that of d-AMP. L-NAME by itself caused an attenuation of LI. L-NAME has been shown to block also other behavioural and biochemical effects of PCP in previous studies and these results and the present findings suggest that at least some of the effects PCP are dependent on NO and possibly also that some NOS inhibitors may exert antipsychotic properties.

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