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A ghrelin receptor (GHS-R1A) antagonist attenuates the rewarding properties of morphine and increases opioid peptide levels in reward areas in mice.

Journal article
Authors Jörgen Engel
Ingrid Nylander
Elisabeth Jerlhag
Published in European Neuropsychopharmacology
Volume 25
Issue 12
Pages 2364-2371
ISSN 0924-977X
Publication year 2015
Published at Institute of Neuroscience and Physiology, Department of Pharmacology
Pages 2364-2371
Language en
Links dx.doi.org/10.1016/j.euroneuro.2015...
Keywords Addiction; Dependence; Dopamine; Ghrelin; Opiate; Reward
Subject categories Neuroscience

Abstract

Gut-brain hormones such as ghrelin have recently been suggested to have a role in reward regulation. Ghrelin was traditionally known to regulate food intake and body weight homoeostasis. In addition, recent work has pin-pointed that this peptide has a novel role in drug-induced reward, including morphine-induced increase in the extracellular levels of accumbal dopamine in rats. Herein the effect of the ghrelin receptor (GHS-R1A) antagonist, JMV2959, on morphine-induced activation of the mesolimbic dopamine system was investigated in mice. In addition, the effects of JMV2959 administration on opioid peptide levels in reward related areas were investigated. In the present series of experiment we showed that peripheral JMV2959 administration, at a dose with no effect per se, attenuates the ability of morphine to cause locomotor stimulation, increase the extracellular levels of accumbal dopamine and to condition a place preference in mice. JMV2959 administration significantly increased tissue levels of Met-enkephalin-Arg6Phe7 in the ventral tegmental area, dynorphin B in hippocampus and Leu-enkephalin-Arg6 in striatum. We therefore hypothesise that JMV2959 prevents morphine-induced reward via stimulation of delta receptor active peptides in striatum and ventral tegmental areas. In addition, hippocampal peptides that activate kappa receptor may be involved in JMV2959׳s ability to regulate memory formation of reward. Given that development of drug addiction depends, at least in part, of the effects of addictive drugs on the mesolimbic dopamine system the present data suggest that GHS-R1A antagonists deserve to be elucidated as novel treatment strategies of opioid addiction.

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