Effect of mild hypothermia on expression of autophagy-related proteins in hippocampus after traumatic brain injury in rats
10.3760/cma.j.issn.1001-8050.2016.02.016
- VernacularTitle:亚低温对脑损伤大鼠海马神经元自噬相关蛋白表达的影响
- Author:
Kun ZHANG
;
Hongyi ZHANG
;
Dongchun WANG
;
Liqian SUN
;
Dayong QI
;
Hongxia ZHOU
- Publication Type:Journal Article
- Keywords:
Traumatic brain injury;
Mild hypothermia;
Autophagy;
Hippocampus
- From:
Chinese Journal of Trauma
2016;32(2):166-170
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of mild hypothermia on expression of autophagyrelated proteins LC3 and Beclin-1 in the hippocampus of rats with traumatic brain injury (TBI).Methods Sixty healthy male adult SD rats were divided into sham group, TBI group, hypothermiatreated group (31-33℃) according to the random number, with 20 rats per group.Rat models of TBI were established using the Marmarou's method.After 4 h of normothermia or hypothermia, the rats were killed 6, 12, 24, and 48 h later.Co-localization of LC3 with neuron specific protein (NeuN) or mammalian target of rapamycinm (mTOR) was determined by double immunofluorescence.Levels of LC3, Beclin-1 and p-mTOR proteins were detected by Western blot analysis.Results LC3 co-localization with NeuN (or mTOR) was observed under confocal laser scanning microscope.In TBI group LC3 and Beclin-1 levels were seen to rise at 6 h, peaked at 24 h and fell slightly at 48 h, but the levels were still higher than these in sham group (P ＜ 0.05).In TBI group p-mTOR level began to decrease at 6 h, reached the lowest point at 12 h, and then ascended at 24 and 48 h, but the level was still lower than that in sham group (P ＜0.05).Mild hypothermia contributed to remarkable decreases in LC3 and Beclin-I expressions, while up-regulating p-mTOR after injury (P ＜ 0.05).Conclusion Mild hypothermia appears to be neuroprotective as it inhibits autophagy in hippocampal neurons after TBI in rats through activation of mTOR signaling pathway.
