Stress-induced Reinstatement of Alcohol-seeking in Rats is Selectively Suppressed by the Neurokinin 1 (NK1) Antagonist L822429

Overview

Journal Psychopharmacology (Berl)

Specialty Pharmacology

Date 2011 Feb 23

PMID 21340476

Citations 43

Authors

Jesse R Schank

Charles L Pickens

Kelly E Rowe

Kejun Cheng

Annika Thorsell

Kenner C Rice

Yavin Shaham

Markus Heilig

Affiliations

Soon will be listed here.

Abstract

Rationale: Genetic inactivation or pharmacological antagonism of neurokinin 1 (NK1) receptors blocks morphine and alcohol reward in rodents, while NK1 antagonism decreases alcohol craving in humans. The role of the NK1 system for relapse-like behavior has not previously been examined.

Objective: Divergence between human and rodent NK1 receptors has limited the utility of NK1 antagonists developed for the human receptor species for preclinical studies of addiction-related behaviors in rats. Here we used L822429, an NK1 antagonist specifically engineered to bind at high affinity to the rat receptor, to assess the effects of NK1 receptor antagonism on alcohol-seeking behaviors in rats.

Methods: L822429 (15 and 30 mg/kg) was used to examine effects of NK1 receptor antagonism on operant self-administration of 10% alcohol in 30-min daily sessions, as well as intermittent footshock stress- and cue-induced reinstatement of alcohol-seeking after extinction of lever responding.

Results: At the doses used, L822429 did not significantly affect alcohol self-administration or cue-induced reinstatement, but potently and dose dependently suppressed stress-induced reinstatement of alcohol seeking, with an essentially complete suppression at the highest dose. The effect of L822429 on stress-induced reinstatement was behaviorally specific. The drug had no effect on conditioned suppression of operant responding following fear conditioning, locomotor activity, or self-administration of a sucrose solution.

Conclusions: To the degree that the reinstatement model provides a model of drug relapse, the results provide support for NK1 antagonism as a promising mechanism for pharmacotherapy of alcoholism, acting through suppression of stress-induced craving and relapse.

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