Journal
EUROPEAN JOURNAL OF PHARMACOLOGY
Volume 519, Issue 1-2, Pages 91-95Publisher
ELSEVIER
DOI: 10.1016/j.ejphar.2005.06.050
Keywords
morphine; naloxone; place aversion; alpha(7) nicotinic acetylcholine receptor subtype; alpha(4)beta(2) nicotinic acetylcholine receptor subtype
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Acute dependence can be observed when naloxone is administered 24 h after even a single dose of morphine, and nicotine attenuates this naloxone-precipitated withdrawal syndrome. This acute dependence has been hypothesized to be associated with a dopaminergic mechanism. In the present study, the role of nicotinic acetylcholine receptor subtypes in the place aversion induced by naloxone in single-dose morphine-treated rats was investigated. Methyllycaconitine (1, 2 and 5 mg/kg), an alpha(7) nicotinic acetylcholine receptor subtype inhibitor, significantly and dose dependently inhibited the attenuating effect of nicotine on naloxone-induced place aversion. In contrast, dihydroxy-beta-erithroidine (1, 2 and 5 mg/kg), an alpha(4)beta(2) nicotinic acetylcholine receptor subtype inhibitor, did not have any effect on the attenuating effect of nicotine on naloxone-induced place aversion. These findings suggested that the alpha(7) nicotinic acetylcholine receptor subtype is associated with the place aversion induced by naloxone in single-dose morphine-treated rats. Nicotinic acetylcholine receptor subtype inhibitors warrant further study as possible treatment for acute dependence. (c) 2005 Elsevier B.V. All rights reserved.
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