ROLE OF REPEATED EXPOSURE TO MORPHINE IN DETERMINING ITS AFFECTIVE PROPERTIES - PLACE AND TASTE CONDITIONING STUDIES IN RATS

被引:122
|
作者
GAIARDI, M
BARTOLETTI, M
BACCHI, A
GUBELLINI, C
COSTA, M
BABBINI, M
机构
[1] Institute of Pharmacology, University of Bologna, Bologna
关键词
SENSITIZATION TO DRUG REWARD; MORPHINE; PLACE CONDITIONING; TASTE CONDITIONING; ABUSE POTENTIAL; RAT;
D O I
10.1007/BF02244201
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Male Sprague Dawley rats were injected daily with saline (morphine naive rats) or 20 mg/kg morphine (morphine experienced rats), starting at least 12 days before training. Subsequent place and taste conditioning indicated that 2.5 mg/kg morphine caused a significant increase in the amount of time spent on the least preferred side by morphine experienced but not by morphine naive rats; furthermore, saccharin consumption was markedly decreased and slightly increased by 10-20 mg/kg morphine in naive and experienced rats, respectively. It was concluded that morphine experience enhances the reinforcing efficacy of morphine and broadens the conditions under which the drug is reinforcing; thus it possibly increases morphine abuse potential.
引用
收藏
页码:183 / 186
页数:4
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