Effects of the CRF Receptor Antagonist D-Phe CRF(12-41) and the Alpha2-adrenergic Receptor Agonist Clonidine on Stress-induced Reinstatement of Nicotine-seeking Behavior in Rats

Overview

Journal Neuropharmacology

Specialties Neurology
Pharmacology

Date 2007 Nov 3

PMID 17976662

Citations 76

Authors

George Zislis

Tina V Desai

Melissa Prado

Hina P Shah

Adrie W Bruijnzeel

Affiliations

Soon will be listed here.

Abstract

Tobacco dependence is a chronic disorder that is characterized by relapse after periods of abstinence. It has been hypothesized that the activation of brain stress systems mediates stress-induced relapse to smoking. The aim of these experiments was to investigate the role of corticotropin-releasing factor (CRF) and norepinephrine in stress-induced reinstatement of extinguished nicotine-seeking behavior. Rats were allowed to self-administer nicotine under a fixed-ratio 5 schedule for 14 days and then nicotine-seeking behavior was extinguished by substituting saline for nicotine. In experiment 1, footshocks reinstated extinguished nicotine-seeking behavior. In experiment 2, there was a trend for the CRF(1/2) receptor antagonist D-Phe CRF((12-41)) (5, 25microg, icv) to decrease stress-induced reinstatement of nicotine-seeking behavior. Footshock-induced reinstatement of nicotine-seeking behavior was observed only in a subset of stress-responsive rats (71%). D-Phe CRF((12-41)) significantly attenuated stress-induced reinstatement of nicotine-seeking behavior in this subset of rats. In experiment 3, the alpha2-adrenergic receptor agonist clonidine (20, 40microg/kg, sc) attenuated footshock-induced reinstatement of nicotine-seeking behavior. In experiment 4, the effects of D-Phe CRF((12-41)) and clonidine on responding for chocolate-flavored food pellets was investigated in order to determine if these compounds have sedative effects. D-Phe CRF((12-41)) did not affect responding for food pellets. Clonidine slightly, but significantly, decreased responding for food pellets. Clonidine decreased responding for food to a lesser degree than it decreased stress-induced reinstatement of nicotine-seeking behavior. These data provide support for the hypothesis that an increased activity of brain CRF and norepinephrine systems mediates stress-induced relapse to nicotine-seeking behavior.

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