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时间:2018-11-27
《缺血后处理对大鼠脑缺血再灌注损伤的影响》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、缺血后处理对大鼠脑缺血再灌注损伤的影响郝宇华郭永清吕国义高春霖【摘要】目的探讨缺血后处理对大鼠脑缺血再灌注损伤的影响。方法成年雄性SD大鼠40只,体重250-300g,随机分为5组(n=8),①假手术组(sham组):只进行麻醉和分离解剖两侧颈总动脉,②缺血再灌注1组(I/R1组):给予脑缺血30min,再灌注24h,③缺血再灌注2组(I/R2组):给予脑缺血30min,再灌注48h,④缺血后处理1组(Post1组):给予脑缺血30min,缺血后处理后再灌注24h,⑤缺血后处理2组(Post2组):给予脑缺血30
2、min,缺血后处理后再灌注48h。使用无创动脉夹夹闭双侧颈总动脉实现脑缺血,撤去动脉夹实现再灌注。在再灌注即刻给予大鼠双侧颈总动脉松夹15s/夹闭15s,如此三次,实现缺血后处理。实验结束处死大鼠,开颅取左侧半球脑组织顶叶皮质制作脑组织匀浆,检测MDA含量和SOD活性。取右侧半球脑组织并作石蜡切片,采用TUNEL法观察大脑顶叶皮质细胞凋亡的情况。结果与sham组相比,I/R1组、I/R2组、Post1组、Post2组MDA含量增高,SOD活性降低(P<0.05);与I/R1组相比,Post1组MDA含量降低,SO
3、D活性升高(P<0.05);与I/R2组相比,Post2组MDA含量降低,SOD活性升高(P<0.05);与I/R1组相比,I/R2组MDA含量降低,SOD活性升高(P<0.05);与Post1组相比,Post2组MDA含量降低,SOD活性升高(P<0.05)。sham组可见少量凋亡细胞。与sham组相比,I/R1组、I/R2组、Post1组、Post2组凋亡指数升高(P<0.05);与I/R1组比较,Post1组凋亡指数降低(P<0.05);与I/R2组比较,Post2组凋亡指数降低(P<0.05);与I/R1
4、组相比,I/R2组凋亡指数降低(P<0.05);与Post1组相比,Post2组凋亡指数降低(P<0.05)。结论①大鼠脑缺血再灌注损伤可以引起细胞凋亡;②缺血后处理对脑缺血再灌注损伤诱发的细胞凋亡有抑制作用;③缺血后处理可以抑制脑缺血再灌注引起的脂质过氧化反应。【关键词】缺血再灌注;缺血后处理;超氧化物歧化酶;丙二醛;细胞凋亡Theeffectsofpostconditioningoncerebralischemic/reperfusioninjuryinratcerebrumHAOYu-hua*,LVGuo-
5、yi,GAOChun-lin,etal.Departmentofanesthesia,ShanxiPeople′sHospital,Shanxi030001,China【Abstract】ObjectiveToinvestigatetheeffectsofpostconditioningonbrainapoptosisoftheSDratinducedbybrainischemic/reperfusionanditsmechanism.Braintissuehomogenatewerecollectedtomea
6、surethecontentofMDAandtheactivityofSOD.Discussingthebrain-protectivemechanismofpostconditiongandthepotentialclinicalapplication.MethodsFortymaleSDratsweighting250-300gwereanesthetizedby10%chloralhydrateperitonealinjection.Ratswererandomlydividedintofivegroups
7、:(1)Theshamgroup;(2)ischemic/reperfusion1group:brainsweresubjectedto30minsofischemiafollowedby24hoursofreperfusion(I/R1group);(3)ischemic/reperfusion2group:brainsweresubjectedto30minsofischemiafollowedby48hoursofreperfusion(I/R2group);(4)postconditioning1grou
8、p:brainsweresubjectedto30minsofischemiafollowedbythreecirclesof15s/15s’postconditioningand24hoursofreperfusion(Post1group);(5)postconditioning2group:brainsweresubjectedto30minsof作者单位:0300
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