凋亡相关基因表达与早期脑损伤时间关系研究

目的 探讨脑挫伤早期细胞凋亡相关基因Bcl-2、Fas表达的变化规律与损伤时间关系。方法 运用光镜观察脑挫伤后脑组织的形态学变化,同时应用图像分析技术检测脑挫伤早期不同时程Bcl-2、Fas免疫组化染色平均光度值的变化规律。结果 伤后8h在脑挫伤周围可见典型的凋亡神经细胞;伤后30min损伤灶周围神经细胞出现Bcl-2、Fas阳性表达,以后呈逐渐上升趋势且表达范围亦逐渐扩大,其中Bcl-2蛋白表达在伤后4h达高峰,随后呈下降的趋势,至伤后10～12h其表达程度与伤后1h相比无明显差异。结论检测细胞凋亡相关基因的表达可用于早期脑损伤时间的推断及生前与死后脑损伤的鉴别。

A study on the relationship between the expression of apoptosis-related gene and the injury time in earlier period following cerebral contusion

Objective To investigate the relationship between the expressive variety of apoptosis-related gene Bcl-2 ,Fas and the brain injury time during earlier period after cerebral contusion. Methods The morphologia feature of brain tissue was observed under microscopy and immunohistochemistry,image analyze technique was applied to detected the expression of Bcl-2 and Fas. Results Typical apoptotic cells were seen 8 hours after cerebral contusion. The expression of apoptosis-related gene was noted after 30 minutes and keep increase subsequently. The expression of Bcl-2 reached maximum level at 4 hours after brain trauma and then declined. Conclusion Detecting the expression of Bcl-2 and Fas would be of valuable in the distinguishment of promortem and postmortem injury,and the estimation of brain injury time during the earlier period after cerebral contusion.