Aversive Properties of Naloxone in Non-dependent (naive) Rats May Involve Blockade of Central Beta-endorphin

Overview

Journal Psychopharmacology (Berl)

Specialty Pharmacology

Date 1985 Jan 1

PMID 2863837

Citations 22

Authors

R F Mucha

M J Millan

A Herz

Affiliations

Soon will be listed here.

Abstract

The present study examines the influence of destruction of the medio-basal arcuate hypothalamus (MBH), the primary site of synthesis of central pools of beta-endorphin (beta-EP), upon the aversive properties of naloxone in a conditioned place preference paradigm. Bilateral radiofrequency lesions of the MBH resulted in a pronounced fall in levels of immunoreactive beta-EP in the brain. Lesioned rats, in contrast to non-operated animals, showed a clear reduction in the conditioned place aversion produced by naloxone. However, they showed no loss of the conditioned preference produced by the mu-selective opioid receptor agonist, morphine, or the conditioned aversion produced by the kappa-selective agonist, U50-488. In contrast to the effect of the lesions, suppression of circulating beta-EP by dexamethasone treatment failed to influence conditioning produced by naloxone. Thus, the data indicate that the aversive properties of naloxone are attenuated by disruption of central (but not peripheral) beta-EP activity. We suggest that these properties of naloxone reflect an antagonism of beta-EP activity in the brain. In addition, the data indicate that differing mechanisms underlie the aversive actions of naloxone as compared to U50-488.

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