Suppression of alcohol self-administration and reinstatement of alcohol seeking by melanin-concentrating hormone receptor 1 (MCH1-R) antagonism in Wistar rats.

Psychopharmacology
Andrea CippitelliMarkus Heilig

Abstract

Melanin-concentrating hormone (MCH) is involved in regulation of appetitive behaviors as well as emotional reactivity and reward, behavioral domains relevant to alcohol addiction. We evaluated the effects of the non-peptide MCH1 receptor antagonist, GW803430 [6-(4-chloro-phenyl)-3-[3-methoxy-4-(2-pyrrolidin-1-yl-ethoxy)-phenyl]-3H-thieno[3,2-d]pyrimidin-4-one; 3-30 mg/kg, i.p.] on alcohol-related behaviors in Wistar rats. Ex vivo binding experiments demonstrated that the GW803430 dose range used resulted in high central MCH1 receptor occupancy. Alcohol self-administration was dose-dependently and potently suppressed, by approximately 80% at the highest dose. Reinstatement of alcohol-seeking induced by alcohol-associated cues was essentially eliminated. In contrast, reinstatement induced by footshock stress was not significantly altered. Taste preference for a quinine/saccharin solution, locomotor activity, and alcohol elimination were unaffected. Together, these observations support a specific involvement of the MCH system in mediating alcohol reward and cue-induced relapse to alcohol seeking. MCH1-R antagonism may constitute an attractive treatment target for alcohol use disorders.

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Mar 29, 2012·Psychopharmacology·Seong Shoon YoonChae Ha Yang
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