Development of a mouse model of ethanol addiction: naltrexone efficacy in reducing consumption but not craving Article First Online: 09 February 2006 Received: 26 January 2005 Accepted: 22 October 2005 DOI:
Cite this article as: Fachin-Scheit, D., Frozino Ribeiro, A., Pigatto, G. et al. J Neural Transm (2006) 113: 1305. doi:10.1007/s00702-005-0416-z Summary.
The aim of the present study was validating pharmacologically a mouse model of alcohol addiction. Mice (n = 60) were offered ethanol (5% and 10%) and water in a free choice paradigm consisting of four phases: free choice (10 weeks), withdrawal (2 weeks), re-exposure (2 weeks) and quinine- adulteration (2 weeks). Control mice (n = 10) had access to water. They were housed individually with food
ad libitum. The animals’ behaviour was evaluated at the beginning of the treatment and during the withdrawal period. After the exposure to the model, mice received i.p. naltrexone (0.0; 0.125; 2.0 and 16.0 mg/kg) or saline. Mice were characterized as: addicted (n = 15, preference for ethanol without reducing intake when ethanol were adulterated with quinine); heavy drinker (n = 14, preference for ethanol but reduced intake when ethanol were adulterated); and light drinker (n = 16, no preference for ethanol). Naltrexone reduced ethanol intake in the heavy and light groups (p ≤ 0.01 and p ≤ 0.05, respectively, compared to saline-treated group) with no effect on water intake. It is discussed that naltrexone may be acting in the positive reinforcing properties of ethanol but does not seem to have anti-craving properties. 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