Cedemex对吗啡戒断大鼠不同脑区cAMP和cGMP含量的影响

目的：观察Cedemex对纳洛酮催促下的戒断大鼠不同脑区环磷腺苷(cAMP)和环磷鸟苷(cGMP)含量的影响。方法：设空白、正常Cedemex、停用吗啡、续用吗啡、Cedemex 8,4,2 g·kg^-1·d^-1、益安口服液组8个实验组，每组10只大鼠。以剂量递增法连续皮下注射吗啡7 d建立吗啡依赖大鼠模型，采用放射免疫方法测定中脑腹侧被盖区(VTA)、皮层和海马的cAMP和cGMP含量。结果：Cedemex对大鼠吗啡戒断症状具有明显的抑制作用(P<0.05)；与空白组相比较，续用吗啡组能够使依赖大鼠的VTA、皮层和海马内cAMP含量显著增高，cGMP含量显著下降(P<0.05); 短期使用Cedemex可使吗啡戒断大鼠VTA、皮层和海马内cAMP含量明显下降，cGMP明显增高(P<0.05)。结论：Cedemex可显著抑制大鼠吗啡戒断反应，其可能的机制与Cedemex能调节中枢cAMP和cGMP含量有关。

Effect of Cedemex on cAMP and cGMP levels of different brain areas in morphine withdrawal rats

Objective: To investigate the effect of Cedemex on cAMP and cGMP contents in different brain regions in morphine withdrawal rats precipitated by naloxone. Method: A physical morphine dependent model of rats was established by subcutaneous injection of morphine in gradually increasing dosage within 7 days. cAMP and cGMP contents of VTA, cortex and hippocampus of the rat brains were determined by radioimmunoassay. Result: The morphine withdrawal symptoms of rats were relieved significantly by ig Cedemex. Compared with the controls, cAMP content in the region of VTA, cortex and hippocampus of the morphine dependent rats were significantly higher (P<0.05), while cGMP contents in those regions were significantly lower (P<0.05). cAMP contents in the area of VTA, cortex and hippocampus of the morphine dependent rats were significantly reduced, while cGMP contents were significantly increased by ig Cedemex. Conclusion: Cedemex may significantly attenuate the morphine withdrawal symptoms in rats. The mechanism of this effect may be related to adjusting the contents of cAMP and cGMP in some brain regions.