大鼠脑震荡伤后脑外主要器官热休克蛋白70、C-fos表达比值与损伤时间关系的研究

The relationship between the expression ratio of heat shock protein 70 to C-fos in the main organs outside the brain and the time of injury after brain concussion in rats

目的研究大鼠脑震荡伤后脑外主要器官热休克蛋白(heat shock protein,HSP)70、C-fos表达比值的变化规律与脑震荡损伤时间之间的关系,以期为脑震荡的损伤时间推断提供新的思路。方法采用自由落体法制作大鼠脑震荡模型,在伤后0.5、1、3、6、12、24、48、96、168、240、336 h时处死大鼠,取脑外主要器官组织(心、肝、脾、肺、肾)作C-fos和HSP70免疫组织化学染色,结果进行图像分析。结果伤后0.5~6 h,HSP70的阳性细胞率缓慢升高,而C-fos阳性细胞率快速升高,二者的表达比值呈下降趋势;伤后6~12 h,HSP70的阳性细胞率持续升高,而C-fos的阳性细胞率逐渐下降,二者的表达比值呈上升趋势;伤后12~336 h,HSP70的阳性细胞率缓慢下降,而C-fos阳性细胞率快速下降,二者的表达比值仍呈上升趋势。结论大鼠脑震荡伤后,脑外主要器官组织和脑组织中C-fos和HSP70两个指标阳性细胞表达率及表达比值变化相类似,说明在脑震荡伤后,观察脑外主要器官组织中两个指标阳性表达比值,同时结合各指标阳性表达细胞率的变化情况可以推断脑震荡损伤的损伤时间区间。

Objective To study the relationship between the expression ratio of heat shock protein （HSP） 70 to C-los in organs outside the brain after brain concussion and the time of injury in rats, in order to provide a new visual angle for determining injury time of brain concussion. Methods The model of brain concussion was established through free falling method. Then the rats were executed at 30 minutes, 1 hour, and 3, 6, 12, 24, 48, 96, 168, 240, 336 hours after injury. Immunohistochemistry staining of C-los and HSP70 were used in the materials from the main organs including heart, liver, spleen, lung and kidney. All related experiment results were studied by using a microscope with image analytical system and homologous statistics. Results From 30 minutes to 6 hours after injury, the proportion of HSP70 immuno-positive cells increased slowly, while the proportion of C-fos immuno-positive cells increased rapidly, and the ratio of HSP70/C-fos positive cells was on the decline. From 6 to 12 hours after injury, the proportion of HSP70 immuno- positive cells rose continuously, while the proportion of C-los immuno-positive cells started to decrease, and the HSPTO/C-fos ratio showed a rising tendency. From 12 to 336 hours after injury, the proportion of liSP70 immuno- positive cells decreased slowly, while the proportion of C-los immuno-positive cells decreased rapidly, and the HSP70/C- fos ratio was still on the rise. Conclusions The proportion of positive cells and ratio of the two markers in the main organs including heart, liver, spleen, lung and kidney are similar to those in the brain of rats after brain concussion. Observing the proportion of positive cells of the two markers together with their ratio in the main organs outside the brain may provide a reference for the determination of injury time after brain concussion.