大鼠神经元液压伤后依钙蛋白酶的时程变化及亚低温的影响

Time course changes of calpain activity following FPI to rats' neurons and the effect of mild hypothermia on calpain activity

目的研究常温时液压冲击伤后神经元内依钙蛋白酶活性变化及亚低温的干预效果。方法体外培养大鼠神经元并制作液压冲击伤模型,在不同时间点进行亚低温干预,以紫外分光光度法检测液压冲击伤后的神经元内Calpain的活性变化及在不同时段亚低温对Calpain活性的干预效应。结果常温时,在细胞损伤后Calpain的活性发生显著变化。亚低温组与常温组Calpain的活性不同,且亚低温对伤后Calpain活性的干预效应与作用起始时间密切相关。结论液压冲击伤后神经元内Calpain活性发生的改变参与细胞创伤的病理过程,亚低温可能通过这一机制具有一定保护创伤性脑损伤的作用。亚低温干预的效果与开始干预时间相关。

Objective To investigate time course changes of intraneuronal calpain activity following fluid percussion injury （FPI） under normothermia （37 ℃） and mild hypothermia （32±0.5） ℃. Methods Rats＇ neurons produced by external culture and FPI models prepared, mild hypothermia was applied for intervention at different time points and the changes in intraneuronal calpain activity following FPI and the intervention effect of mild hypothermia on calpain activity during different time courses were detected by UV-spectrophotometry. Results Remarkable changes occurred to calpain activity following FPI at 37 ℃, while the intervention effect of mild hypothermia on calpain activity was different, closely related to the starting time point of intervention. Conclusion The changes of intraneuronal calpain activity following FPI join the pathological process of cellular trauma; mild hypotherrnia might protect patients with traumatic brain injury （TBI） to some extent through the regulation ofcalpain activity. And, the intervention effect of mild hypothermia has some correlation with the starting time point of intervention.