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作 者:张登科[1] 郝伟[1] 石富娟[2] 苏巧荣[2] 张宏卫[2] 谌红献[1]
机构地区:[1]中南大学湘雅二医院精神卫生研究所,长沙410011 [2]绍兴文理学院医学院精神病学教研室
出 处:《中华精神科杂志》2008年第3期176-179,共4页Chinese Journal of Psychiatry
基 金:国家重点基础研究发展计划资助项目(2003C515400);国家自然科学基金资助项目(30500180)
摘 要:目的观察多巴胺D2受体部分激动剂——特麦角脲对大鼠海洛因固定比率、累进比率自身给药行为的影响。方法对64只雄性SD大鼠分别处理如下:(1)取16只大鼠训练自身给水(自然奖赏模型对照),造模成功后随机分为2组,分别接受特麦角脲0.4mg/kg和生理盐水腹腔注射干预,观察对大鼠固定比率自身给水行为的影响。(2)取32只大鼠训练海洛因固定比率自身给药,自身给药行为稳定后随机分为4组,每组8只,分别腹腔注射特麦角脲3种剂量(0.1,0.2,0.4mg/kg体质量)和生理盐水(对照组),观察不同剂量特麦角脲对大鼠海洛因固定比率自身给药行为的影响。(3)取16只大鼠训练海洛因累进比率自身给药,造模成功后随机分为2组,分别接受特麦角脲0.4mg/kg和生理盐水腹腔注射干预,观察对大鼠海洛因累进比率自身给药行为的影响。结果(1)特麦角脲0.4mg/kg组固定比率自身给水行为与生理盐水干预组相比,差异无统计学意义(P〉0.05)。(2)特麦角脲0.2mg/kg组和0.4mg/kg组的大鼠海洛因固定比率自身给药次数干预前后的差值[(6.25±3.31)次和(11.75±4.92)次]高于生理盐水对照组[(-1.12±4.30)次],差异均有统计学意义(均P〈0.01)。(3)特麦角脲0.4mg/kg组的大鼠累进比率自身给药的断点干预前后的差值[(20.2±8.7)次]高于生理盐水组[(-1.1±4.3)次],差异有统计学意义(P〈0.01)。结论D2受体部分激动剂特麦角脲可降低海洛因固定比率和累进比率自身给药行为,以降低海洛因使用期的强化效应。Objective To characterize the effects of terguride, a partial dopamine agonist at the D2 receptor subtype, on intravenous self-administration of heroin in fixed ratio and progressive ratio schedule. Methods The male adult Spragne-Dawley rats were trained to self administrate heroin under fixed ratio and progressive ratio, water self administration was set as natural reward control group. The effects of acute administration of tergnride ( 0. 1 - 0. 4 mg/kg i. p. ) or saline were compared. Results Compared with saline group, tergnride significantly and dose-dependently reduced the responding of heroin self administration under fixed ratio. In addition, terguride at the dose of 0. 4 mg/kg significantly decreased the maximum number of responses delivered for a single injection of heroin (" breaking point ") under progressive ratio. Tergnride had no significant effect on water self administration under fixed ratio. Conclusion The D2 partial agonist terguride could reduce the reinforcing property of heroin.
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