补阳还五汤对大鼠局灶性脑缺血损伤血脑屏障的影响

摘要

目的：观察补阳还五汤对大鼠局灶性脑缺血损伤血脑屏障的保护作用,阐明该方抗脑缺血的机理。方法采用线栓法复制大鼠局灶性脑缺血模型。将SD大鼠随机分为假手术组、模型组和补阳还五汤组,造模后24 h给药,补阳还五汤组给予补阳还五汤灌胃,假手术组、模型组给予等量生理盐水灌胃。造模后7 d,评价各组大鼠神经功能并处死取材,四氮唑红染色观察大鼠脑组织梗死体积,HE 染色观察大鼠脑微血管的一般形态,ELISA 检测大鼠脑组织内基质金属蛋白酶(MMP)-9、MMP-2、血管内皮生长因子(VEGF)蛋白水平及血清中血管性血友病因子(vWF)的表达。结果与模型组比较,补阳还五汤组能显著改善神经功能行为评分,减少脑梗死体积,降低MMP-9、MMP-2、VEGF、vWF水平。病理观察结果显示,补阳还五汤组脑组织病理变化较模型组减轻。结论补阳还五汤对大鼠局灶性脑缺血具有保护作用,其作用可能与保护血脑屏障,抑制MMP-9、MMP-2、VEGF、vWF的表达有关。%Objective To investigate the effect of Buyang Huanwu Decoction on blood-brain barrier of focal cerebral ischemia rats, and explore the mechanism of the decoction. Methods The model of focal cerebral ischemia was made by thread embolism method. SD rats were divided randomly into sham-operated group, model group and Buyang Huanwu Decoction group. Buyang Huanwu Decoction group was given Buyang Huanwu Decoction by gavage, the sham-operated group and model group were given normal saline of the same quantity 24 h after modeling. The nervous function deficit scores was evaluated, brain tissues and serum were taken from the rats after treating for seven days, infarct volume was detected by TTC staining, and pathological changes of microvessel were observed microscopically in HE stained sections. And the protein level of MMP-9, MMP-2, VEGF in brain tissue and the serum levels of vWF in serum of every groups were measured by ELISA. Results Compared with model group, Buyang Huanwu Decoction significantly improved the neurological behavior performance, decreased the cerebral infarct volume, alleviated the pathological changes and decreased the protein level of MMP-9, MMP-2, VEGF, vWF. Conclusion Buyang Huanwu Decoction has the protective effect on blood-brain barrier in the model rats of focal cerebral ischemia. The mechanism may be related with restrainning the expression of MMP-9, MMP-2, VEGF, vWF.