Nitric oxide synthase inhibition impairs spatial navigation learning and induces conditioned taste aversion

Pharmacology, Biochemistry, and Behavior
M A PrendergastA V Terry

Abstract

The free radical gas nitric oxide (NO) is formed from the amino acid precursor L-arginine in brain regions which are associated with learning and the formation of memory. We have previously reported that administration of the nitric oxide synthase (NOS) inhibitor N omega-nitro-L-arginine methyl ester (L-Name) impairs delayed recall in non-human primates but that, at higher doses, impairment is associated with aversive gastrointestinal side effects. The purpose of the present study was to examine the effects of L-Name on learning in a rat spatial navigation task and to assess the ability of L-Name to induce a conditioned taste aversion (CTA) to a novel sucrose solution in a two-bottle choice paradigm. In the Morris water maze. L-Name (5, 20, and 50 mg/kg) markedly impaired cued spatial learning required to locate a hidden platform on three consecutive days of testing, but did not affect general activity levels. These data also demonstrated the ability of L-Name to induce a potent CTA, though only with the 20 and 50 mg/kg doses. Both the impairment of learning and CTA were blocked by administration of a mole equivalent dose of L-arginine, indicating that attenuated NO activity was associated with both behavioral effects. These da...Continue Reading

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Aug 15, 2002·Pharmacology, Biochemistry, and Behavior·B E McKayN M Fournier
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