Effect of exhaustive exercise preconditioning on GAP-43 and Nogo-A in rats with cerebral ischemia reper-fusion / 中华行为医学与脑科学杂志

ABSTRACT

Objective To observe the effect of exhaustive exercise preconditioning on GAP?43 and Nogo?A in rats with cerebral ischemia reperfusion. Methods 90 rats were randomly divided into sham oper?ation group,group of cerebral ischemia reperfusion(I/R) and exhaustive exercise preconditioning group.Rats were sacrificed at 6 h,1 d,3 d and 7 d respectively after injury. Neural functions were detected by shuttle box. Morphological changes of hippocampal neural cells were observed by HE staining. Expressions of GAP?43 and Nogo?A were detected respectively by immunohistochemistry and RT?PCR technology. Re?sults Compared with the sham group,the death rate of apoptotic neurons in I/R group was decreased( 6 h(30.97±2.09)%,1 d(38.41±1.10)%,3 d(46.81±2.04)%,1 d(43.46±1.57)%),the index of learning and memory ability(AARR?7 d(38.00±12.60)%,PAL?7 d(27.90±1.79)s) and expression of GAP?43 were decreased(6 h(2.89±0.85),1 d(4.06±0.25),3 d(4.78±0.98),7 d(7.02±0.21)),the expression of Nogo?A was increased(6 h(2.93±0.19),1 d(5.47±0.32),3 d(4.62±0.26),7 d(4.12±1.11))(P<0.05).Compared with I/R group,the death rate of apoptotic neurons in exhaustive exercise preconditioning group were decreased,the index of learning and memory ability(AARR?7 d(20.66±7.60)%,PAL?7 d(35.53±2.41)s) and expression of GAP?43 were decreased(6 h(2.03±0.14),1 d(2.92±0.27),3 d(3.35±0.34),7 d(5.24±0.52)),the expression of Nogo?A were increased(6 h(3.92±0.51),1 d(6.90± 0.79),3 d(5.87±0.48),7 d(5.37±0.50))(P<0.05). Conclusion Exhaustive exercise preconditioning ag? gravates the injury of neurons and neural function,which is related to the regulation of GAP?43 and Nogo?A in the hippocampus of rats.