白藜芦醇对大鼠脑缺血／再灌注损伤后星形胶质细胞活化的影响

摘要

目的：研究白藜芦醇对大鼠脑缺血／再灌注损伤后星形胶质细胞活化的影响。方法45只 SD ♂大鼠随机分成假手术组（Sham）、对照组（Con）和白藜芦醇组（30 mg· kg －1，Res），每组15只。于缺血／再灌注后3 h 使用白藜芦醇或溶剂治疗，连用7 d。脑缺血24 h 时，TTC 法检测脑梗死体积，HE 染色检测病理变化，Longa 评分行神经功能评分，免疫组织化学检测缺血半暗带皮质半胱氨酸天冬氨酸蛋白酶-3（Caspase-3）的表达。脑缺血14 d 时，免疫组织化学及免疫荧光法检测胶质纤维酸性蛋白（glial fibrillary acidic pro-tein，GFAP）和神经元 NeuN 蛋白表达。结果白藜芦醇治疗较对照组能明显改善神经功能、减小梗死体积、减少神经元脱失及凋亡，抑制星形胶质细胞的活化与增殖（P ＜0.01）。结论白藜芦醇治疗可抑制星形胶质细胞的异常活化，保护缺血半暗带神经元，改善神经功能。%Aim To investigate the effect of resveratrol on astrocyte activation after cerebral ischemia/reperfusion injury in rats.Methods 45 male Sprague-Dawley rats were divided into sham,control and resveratrol groups, 15 rats in each group.Resveratrol or solvent was intra-peritoneally perfused into the rats for 7 consecutive days after 3h for MCA I /R.Cerebral infarction volume with TTC,neurological function score with Longa score, and pathological change with HE staining,the protein expressions of Caspase-3 with immunohistochemistry at 24h after MCA I /R were examined.The protein ex-pressions of GFAP and NeuN in penumbra were detec-ted with immunohistochemistry and immunofluores-cence at 14d after MCA I /R.Results Resveratrol treatment significantly improved the neurological func-tion score,decreased the infarct volume,reduced neu-ron loss,and inhibited the activation and proliferation of astrocytes,compared with the control group.Con-clusion Resveratrol can inhibit the excessive activa-tion of astrocytes,protect neurons in penumbra and im-prove neurological function.