Systemic administration of racemic baclofen reduces both acquisition and maintenance of alcohol consumption in male and female mice.

Autor: Bauer MR; Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN, 46202, United States., Hernández M; Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN, 46202, United States., Kasten CR; Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN, 46202, United States., Boehm SL 2nd; Indiana Alcohol Research Center and Department of Psychology, Indiana University - Purdue University Indianapolis, Indianapolis, IN, 46202, United States. Electronic address: slboehm@iupui.edu.
Jazyk: angličtina
Zdroj: Alcohol (Fayetteville, N.Y.) [Alcohol] 2022 Sep; Vol. 103, pp. 25-35. Date of Electronic Publication: 2022 Jul 20.
DOI: 10.1016/j.alcohol.2022.06.003
Abstrakt: Baclofen is a GABA B receptor agonist with proposed use as a treatment for alcohol use disorder (AUD). In preclinical studies, racemic baclofen decreases alcohol consumption in both mice and rats; however, there is a significant disparity in the efficacy of the drug across species. We previously demonstrated that baclofen is enantioselective, with the racemic enantiomer successfully reducing binge-like alcohol consumption during Drinking-in-the-Dark (DID) in C57BL/6J (B6) mice, as well as 24-h consumption during two-bottle choice (2BC) preference drinking in replicate 1 High Alcohol Preferring (HAP) mice. Here we extend these findings by investigating the effects of racemic baclofen on the acquisition and maintenance of alcohol consumption, locomotor activity, and saccharin drinking in two different mouse genotypes and drinking paradigms. Adult male and female B6 mice were allowed free access to 20% (v/v) alcohol for 2 h daily in a 14-day DID procedure. Adult male and female replicate 2 HAP (HAP2) mice were allowed 24-h access to 10% (v/v) alcohol versus tap water in a 2BC procedure for 14 days. Systemic injections of baclofen (0.0 or 3.0 mg/kg) were given 3 h into the dark cycle on days 1-5 in alcohol acquisition experiments and days 6-10 in alcohol maintenance experiments. We found that racemic baclofen significantly reduces acquisition of DID and 2BC alcohol drinking in male and female B6 and HAP2 mice, whereas it only significantly reduces the maintenance of DID alcohol intake in B6 mice. Racemic baclofen did not alter home cage locomotor activity but did alter saccharin intake, suggesting it may have nonspecific effects. The current data add to literature suggesting that smaller doses of racemic baclofen may be an effective treatment of AUD. Future work should focus on the longitudinal efficacy of racemic baclofen in high-drinking mouse genotypes to further investigate whether it is effective for those with a genetic predisposition to AUD.
Competing Interests: Declaration of competing interest The authors declare no conflict of interest.
(Copyright © 2022 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: