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目的 观察细胞色素C(Cyt C)和凋亡相关基因 bax 在创伤后应激障碍(PTSD)大鼠海马神经元中的表达,探讨其在细胞凋亡中的作用及相互关系. 方法 成年雄性Wistar大鼠60只,采用国际认定的无连续单一应激(SPS)方法刺激大鼠建立PTSD大鼠模型,取SPS刺激后1d、4d、7d、14d、28d组和正常对照组.应用免疫组织化学、免疫荧光双标、激光扫描共焦显微镜技术和免疫印迹法检测Cyt C 和Bax 蛋白的表达. 结果 Cyt C 蛋白于SPS刺激后4d达到高峰并维持较高水平,SPS刺激7d之后逐渐下降.Bax蛋白于SPS刺激后7d 达到高峰,14d开始下调,28d恢复到正常水平. 结论 在PTSD大鼠海马神经元中,Bax上调并促进了Cyt C的释放,而Cyt C的释放可能是导致PTSD大鼠海马神经元凋亡的机制之一.“,”Objective To observe the expression of cytochrome C (Cyt C)and apoptosis-related gene Bax in hippocampus of posttraumatic stress disorder(PTSD)rats in order to investigate their effects and relationships. Methods Sixty male Wistar rats were used in the present study. The single-prolonged stress(SPS)-method was carried out to set up the rat PTSD models. There were six groups:after SPS 1,4,7,14,28 days groups and control group. The expression of Cyt C and Bax proteins were detected with immunohistochemistry, double immunofluorescence, confocal laser scanning microscopy and Western blotting. Results The expression of Cyt C peaked at 4 days and maintained higher level at 7 days after SPS. At 7 days after SPS, strong immunoreactivity of Bax was noticed,At 14 days after SPS, the expression of Bax was down-regulated and then gradually decreased. Conclusion Bax is upregulated and promotes the releasing of Cyt C. And the releasing of Cyt C may be one of mechanisms of inducing apoptosis in the hippocampus of PTSD rats.