摘要
目的探究补阳还五汤(Buyang Huanwu Decoction,BYHWD)降低氧化应激水平保护脑缺血再灌注损伤(cerebral ischemia/reperfusion injury,CIRI)大鼠血脑屏障(blood-brain barrier,BBB)的机制。方法采用线栓法建立大鼠大脑中动脉栓塞再灌注(middle cerebral artery occlusion/reperfusion,MCAO/R)模型,应用PeriCam PSI激光散斑血流成像系统检测脑血流量判定模型建立是否成功。通过Zea Longa评分评价大鼠神经功能缺损情况;HE染色观察大鼠脑组织病理学改变;干湿重法检测脑水肿程度;伊文思蓝(Evans blue,EB)染色检测BBB通透性;透射电镜观察BBB超微结构改变;试剂盒检测氧化应激相关指标活性氧(ROS)、丙二醛(MDA)的含量及总超氧化物歧化酶(SOD)活性;免疫组织化学染色及Western blot检测基质金属蛋白酶-9(MMP-9)的表达水平;免疫荧光双染及Western blot检测紧密连接蛋白(tight junction protein,TJP)中Occludin、ZO-1、Claudin-5蛋白的表达水平。结果BYHWD能够降低MCAO/R大鼠神经功能缺损评分,减轻脑组织病理学损伤,减轻血脑屏障结构破坏,延长紧密连接结构致密区,减轻缺血侧大脑脑水肿情况,降低BBB通透性。BYHWD可以降低ROS与MDA水平,提高SOD活性,降低MMP-9表达水平,提高Occludin、Claudin-5、ZO-1蛋白表达水平。结论BYHWD可以升高BBB紧密连接蛋白的表达水平,降低血脑屏障通透性,保护血脑屏障超微结构,减轻脑水肿,其机制可能与BYHWD抗氧化应激,抑制MMP-9的激活相关。
Objective To explore the mechanisms of Buyang Huanwu Decoction(BYHWD)in reducing oxidative stress levels to protect the blood-brain barrier(BBB)in cerebral ischemia/reperfusion injury(CIRI)rats.Methods A middle cerebral artery occlusion/reperfusion(MCAO/R)model in rats was established via wire embolization method.PeriCam PSI laser speckle flow imaging was applied to detect whether the model was successfully established.Neurological deficits in the rats were evaluated by Zea Longa score,and histopathological changes in the rat brain were observed by HE staining.The degree of brain edema was detected by the dry and wet weight method.BBB permeability was detected by Evans blue staining,and ultrastructural changes to the BBB were observed by transmission electron microscopy.The levels of ROS,MDA and SOD activities,which are related to oxidative stress,were detected using kits.The expression levels of matrix metalloproteinase-9(MMP-9)were detected by immunohistochemical staining and Western blot.The expression levels of Occludin,ZO-1,and Claudin-5 tight junction proteins were determined via immunofluorescence and Western blot.Results BYHWD reduced neurological deficit scores,alleviated brain histopathological damage,alleviated BBB structural disruption,prolonged the appearance of dense regions in the tight junction structure,attenuated edema of the brain on the ischemic side,and reduced BBB permeability in MCAO/R rats.BYHWD decreased the levels of ROS and MDA,increased the activity of SOD,decreased the expression levels of MMP-9,and increased the expression levels of Occludin,Claudin-5 and ZO-1.Conclusions BYHWD can increase BBB tight junction protein expression levels,reduce the permeability of the BBB,protect the ultrastructure of the BBB,and reduce brain edema,and its mechanisms may be related to its antioxidant activity and inhibition of MMP-9 activation.
作者
马娴
高萍
刘真一
辛紫媛
靳晓飞
周晓红
高维娟
MA Xian;GAO Ping;LIU Zhenyi;XIN Ziyuan;JIN Xiaofei;ZHOU Xiaohong;GAO Weijuan(Hebei University of Chinese Medicine,Shijiazhuang 050000,China;Hebei Key Laboratory of Chinese Medicine Research on Cardio-cerebrovascular Disease,Shijiazhuang 050000;Affiliated Hospital of Chengde Medical University,Chengde 067000)
出处
《中国比较医学杂志》
CAS
北大核心
2024年第3期75-84,101,共11页
Chinese Journal of Comparative Medicine
基金
中央引导地方科技发展资金项目(206Z7706G)
河北省科技研发平台与新型研发机构建设专项(20567626H)
河北中医学院科技能力提升重点项目(KTZ2019018)。
关键词
补阳还五汤
脑缺血再灌注损伤
透射电镜
氧化应激
血脑屏障
基质金属蛋白酶-9
Buyang Huanwu Decoction
cerebral ischemia-reperfusion injury
transmission electron microscopy
oxidative stress
blood-brain barrier
matrix metalloproteinase-9
