中枢NO-cGMP系统对大鼠吗啡戒断症状的影响

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目的:观察中枢NO-cGMP系统对大鼠吗啡戒断症状的影响.方法:用皮下递增注射吗啡法建立吗啡依赖模型,腹腔注射纳洛酮催瘾.侧脑室注射(i.c.v.)不同药物,观察对大鼠叩齿、扭体、湿狗样抖动、舔阴茎、逃逸、体重丢失等吗啡戒断症状的影响.结果:微量侧脑室注射(i.c.v.)NO的供体硝普钠(SNP)、NO的前体L-精氨酸(L-Arg)、环磷酸鸟苷(cGMP)以增加脑内NO的释放,激活鸟苷酸环化酶(GC),提高脑内cGMP水平,结果使吗啡戒断症状加重;相反,微量注射NO合酶(NOS)抑制剂NG-硝基-L精氨酸(LNNA)及鸟苷酸环化酶(GC)抑制剂甲基兰(MB),使脑内NO生成减少,降低NO对GC的激活作用,脑内cGMP生成减少,则可使大鼠吗啡戒断症状减轻.结论:NO-cGMP系统在产生吗啡戒断反应中具有重要作用.
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