期刊
DRUG AND ALCOHOL DEPENDENCE
卷 109, 期 1-3, 页码 96-103出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.drugalcdep.2009.12.019
关键词
GABA(B) receptor; Positive allosteric modulators of the GABA(B) receptor; rac-BHFF; Operant oral alcohol self-administration; Reinforcing properties of alcohol; Sardinian alcohol-preferring (sP) rats
资金
- Neuroscience Institute
- National Research Council [Consiglio Nazionale delle Ricerche (CNR)], Cagliari, Italy
- European Research Advisory Board (ERAB), Lasne, Belgium
The present study was designed to extend to the newly synthesized rac-BHFF [(R,S)-5,7-di-tert-butyl-3-hydroxy-3-trifluoromethyl-3H-benzofuran-2-one] the investigation on the capacity of positive allosteric modulators of the GABA(B) receptor to reduce alcohol self-administration in rats. To this end, selectively bred Sardinian alcohol-preferring (sP) rats were initially trained to respond on a lever [on a fixed ratio 4 (FR4) schedule of reinforcement] to orally self-administer alcohol (15%, v/v) or sucrose (0.7%, w/v) in daily 30-min sessions. Once responding reached stable levels, the effect of rac-BHFF (0, 50,100, and 200 mg/kg; i.g.) on responding for alcohol and sucrose was determined. Pretreatment with rac-BHFF produced a dose-dependent suppression in responding for alcohol; reduction in the total number of responses for alcohol, in comparison to vehicle-treated rats, averaged approximately 30%, 65%, and 90% in 50, 100, and 200 mg/kg rac-BHFF-treated rats, respectively. Pretreatment with 200 mg/kg rac-BHFF markedly increased the latency to the first response on the alcohol lever. The effect of pretreatment with rac-BHFF on alcohol self-administration was highly specific, since (a) responding for sucrose was reduced (to approximately 50%, in comparison to vehicle-treated rats) only by pretreatment with 200 mg/kg racBHFF, and (b) latency to the first response on the sucrose lever was completely unaltered by any rac-BHFF dose. Treatment with rac-BHFF did not alter spontaneous locomotor activity in an independent group of sP rats. The present data constitute a further piece of evidence on the capacity of positive allosteric modulators of the GABAB receptor to reduce alcohol's reinforcing properties in rats. (C) 2009 Elsevier Ireland Ltd. All rights reserved.
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