Abstract：Objective To study the effect of [Gly14]-Humanin on oxidative stress and neuron apoptosis after focal cerebral ischemia reperfusion injury in rats. Methods A rat model of acute middle cerebral artery occlusion（MCAO）and reperfusion was established by suture embolism. Ninety-six healthy male Sprague-Dawley rats were randomly divided into sham-operation group,model group,normal saline group and HNG group. And 5 μL HNG（100 nmol/L） in the rats of the HNG group,normal saline in the rats of the sham-operation group and normal saline group were given to rats 3 days before operation respectively（iv,three times,qd）. After cerebral ischemia 3 h and 24 h of reperfusion,neurological deficit score（NDS）were performed for each group,and the activity of sod,levels of GSH and MDA in cerebral tissue were detected. TUNEL staining were used to detect neuronal apoptosis. Results Median（Interquartile range）of NDS was 0（0）in sham-operation group,1.5（1）in model group,3（1）in normal saline group and 3（1）in HNG group,respectively,and the NDS of sham-operation group was significantly lower than the other three groups. The NDS of HNG group was significantly lower than the model group and normal saline group（all P<0.05）. Compared with sham-operation group,the activity of SOD of model group,normal saline group and HNG group rats[（11.65±1.66）,（12.15±1.56） and （19.43±1.47）U/mL] and levels of GSH [（8.84±1.23）,（7.51±1.16） and （11.17±1.67）mg/L]were decreased,and levels of MDA[（42.61±1.79）,（40.33±1.24）and （35.39±1.29）nmol/mL]were increased（P<0.05）. The activity of SOD and levels of GSH of HNG group were significantly higher than model group and normal saline group,but the levels of MDA was significantly lower than model group and normal saline group（all P<0.05）. Compared with sham-operation group[（0.13±0.01）%],percentage of neuronal apoptosis of model group,normal saline group and HNG group rats[（0.59±0.07）%,（0.51±0.08）% and （0.22±0.03）%,respectively]were increased（P<0.05）,and percentage of neuronal apoptosis of HNG group was significantly lower than model group and normal saline group（all P<0.05）. Conclusion By increasing the activity of SOD and levels of GSH,[Gly14]-Humanin can resist focal cerebral ischemia reperfusion injury,and can decrease the neuro apoptosis of ischemic area,thus mitigate the neurologic deficit.
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