黄芪注射液抑制脑缺血再灌注大鼠海马组织Apaf-1表达

 目的： 观察黄芪注射液对脑缺血再灌注大鼠海马组织凋亡蛋白酶激活因子1（Apaf-1）蛋白及其mRNA表达的影响。方法： 将健康雄性SD大鼠120只随机分为假手术组、脑缺血再灌注组、黄芪注射液干预组和溶剂对照组。采用四血管阻断法制备大鼠脑缺血再灌注模型，除假手术组外其余3组根据再灌注不同时点再分为0 h、0.5 h、2 h、6 h、24 h、72 h和120 h 7个亚组，于再灌注相应时点提取脑组织。采用免疫组织化学和Western blotting检测大鼠海马组织Apaf-1蛋白的表达，RT-PCR法检测Apaf-1 mRNA的表达。结果： 除0 h和120 h外，脑缺血再灌注组各个时点Apaf-1蛋白及mRNA表达均较假手术组增加 (P<0.05)；与脑缺血再灌注组相比，黄芪注射液干预组各个时点Apaf-1蛋白及mRNA表达均显著减少 (P<0.05)，而溶剂对照组各时点与脑缺血再灌注组相比则均无显著变化 (P>0.05)。结论： 黄芪注射液能抑制大鼠海马组织Apaf-1蛋白及mRNA表达，从而抑制脑缺血再灌注大鼠海马神经元的凋亡。

Astragalus injection inhibits expression of Apaf-1 in rat hippocampus after cerebral ischemia and reperfusion

AIM: To investigate the effect of Astragalus injection on the expression of apoptotic protease-activating factor 1 (Apaf-1) in the hippocampus of global cerebral ische-mia-reperfusion rats. METHODS: Male SD rats were randomly divided into 4 groups with 30 each: sham operation group, cerebral ischemia-reperfusion group, cerebral ischemia-reperfusion+Astragalus injection group, and cerebral ischemia-reperfusion+vehicle group. The global cerebral ischemia-reperfusion model of the rats was established by 4-vessel occlusion. The rats in cerebral ischemia-reperfusion group, cerebral ischemia-reperfusion+Astragalus injection group and cerebral ischemia-reperfusion+vehicle group were further divided into 7 subsets, according to the reperfusion time of 0 h, 0.5 h, 2 h, 6 h, 24 h, 72 h and 120 h. After reperfusion, the brains were removed at the corresponding time points. The protein expression of Apaf-1 in hippocampal neurons was detected by immunohistochemistry and Western blotting. The mRNA expression of Apaf-1 was observed by RT-PCR. RESULTS: Compared with sham operation group, the expression of Apaf-1 at mRNA and protein levels at all time points except 0 h and 120 h increased obviously in cerebral ischemia-reperfusion group (P<0.05). Compared with cerebral ischemia-reperfusion group, the expression of Apaf-1 at mRNA and protein levels at all time points except 0 h and 120 h decreased obviously in cerebral ischemia-reperfusion+Astragalus injection group (P<0.05). However, those in cerebral ischemia-reperfusion+vehicle group had no obvious change (P>0.05). CONCLUSION: Astragalus injection inhibits the expression of Apaf-1 at mRNA and protein levels in hippocampus of global cerebral ischemia-reperfusion rats, thus inhibiting the apoptosis of hippocampal neurons.