REINSTATEMENT OF HEROIN SELF-ADMINISTRATION HABITS - MORPHINE PROMPTS AND NALTREXONE DISCOURAGES RENEWED RESPONDING AFTER EXTINCTION

被引:117
作者
STEWART, J
WISE, RA
机构
[1] Center for Studies in Behavioral Neurobiology, Department of Psychology, Concordia University, Montreal, H3G 1M8, Quebec
关键词
OPIOIDS; SELF-ADMINISTRATION; REINSTATEMENT; PROPONENT PROCESS; OPPONENT PROCESS; NALTREXON; RELAPSE;
D O I
10.1007/BF02245289
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The effects of morphine, naltrexone, and nalorphine were studied in rats trained to lever-press for intravenous heroin and then tested under conditions of non-reinforcement. Animals were reinforced for lever-pressing on a continuous reinforcement schedule (100-mu-g/kg per infusion) for 2-3 h each day following which reinforcement was terminated and animals were studied under extinction conditions for the remainder of the session. Each day following the termination of responding under extinction conditions, animals were given a single injection of saline, morphine, nalorphine, or naltrexone; lever-pressing under the extinction conditions was then observed for several hours. When animals adapted to this regimen, very low levels of responding were seen following saline injections; morphine (2 or 10 mg/kg) reinstated vigorous responding that lasted 1-4 h. Naltrexone (2 mg/kg) suppressed responding below the levels seen after saline, and nalorphine (10 mg/kg) had the same effect as saline. These observations support the view that opioid-seeking behavior is primed by the proponent or opioid-like actions of opioids and not by the opponent or drug-opposite effects associated with opioid withdrawal.
引用
收藏
页码:79 / 84
页数:6
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