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ID:33202536
大小:4.29 MB
页数:45页
时间:2019-02-22
《异丙酚对大鼠内毒素性脑损伤的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、重庆医科大学硕士学位论文异丙酚对大鼠内毒素性脑损伤的影响姓名:曹慧灵申请学位级别:硕士专业:麻醉学指导教师:但伶201205异丙酚对大鼠内毒素性脑损伤的影响摘要目的;观察异丙酚对大鼠内毒素性脑损伤的影响,并探讨其作用机制。方法:健康清洁级SD大鼠72只,周龄6周,雌雄不限,体重200~250g,随机分为3组(n=24):对照组(C组)、LPS组(L组)和异丙酚组(P组)。L组和P组由左颈内动脉注射LPS1mg/l(g制备内毒素性脑损伤模型,P组在给予LPS后立即通过腹腔注射给予异丙酚(100毗g),C组分别于左颈内动脉和腹腔注射与LPS和异丙酚等容量生理盐水。分别于腹腔给
2、药后6、24、48和72h处死6只大鼠,取大鼠大脑皮质组织,测定脑组织含水量,、Ⅳestemblot法检测脑组织HMGBl和磷酸化p38MAPK表达水平,免疫组化法检测脑组织NF-KBp65和iNOS表达水平,光镜下观察脑组织形态及病理学变化。结果:与C组比较,L组各时点脑组织含水量升高,脑组织蹦GBl、磷酸化p38MAPK、NF.1(Bp65和iNOS表达上调,且HMGBl、磷酸化p38MAPK、NF—KBp65和iNOS表达水平均于6h开始增加,24h达高峰,48h及72h各指标仍高于C组(尸3、、NF-KBp65和iNOS表达下调(尸<0.05)。P组脑组织病理学损伤轻于L组。结论:(1)内毒素可引起大鼠脑损伤,可能与内毒素诱导HMGBl、iNOS表达增加有关,p38MAPK、NF一1(B通路的活化可能参与了其发生发展过程;(2)异丙酚可减轻LPS所致的大鼠内毒素性脑损伤,其机制可能与异丙酚下调HMGBl、iNOS表达,抑制p38MAPK、NF-KB通路的活化,进而减轻炎性反应有关。关键词:异丙酚;脑;脂多糖;HMGBl;iNOSEFFECTS0IFPROpOFOLONLPS.肿UCEDBRAINABsTRACTObjective:ToinVes_tigatet4、hee舵ctsofpropof01onLPS-inducedbraininju叫inratsaIldthepossiblemechallism.M砌lods:Seventy.twoSprague-Dawleyratsofbothsexes,aged6weeks,wei曲ing200~250g,wereraIldoIIllydiVidedinto3乒oups(n224each):control伊oup(伊oupC)、LPS可oup(伊oupL)、propofol伊叫p(伊oupP).BraininjuWwasproducedbyinjectionofLPSlmg/l(gVi5、athe1eRint锄alcarotidarteqinLa11dP乒oups.Propofol1OOmg/l【gwaSinjectedintr印嘶toneallyimmediatelyaRertheLPSadlIlinistrationin伊oupP,whiletheequalvolumeofnonnalsalinewas百Veninsteadofpropofolin乒oupL,tlleequalVolumeofnomalsalinewas百VeninsteadofLPSandpropofolin伊oupC.Sixratsineach伊oupweresacnficedat6、6、24、48aIld72haRerintrap嘶tonealadlllinistration.Tllebrainstisslleswereimmediatelyrelnovedforthedetenninationofwatercontent,theexpressionofI_玎ⅥGBlaJldphosphoqlationofp38MAPKbywestemblot,theexpressionofNF.KBp65andiNOSbyimmunohistochemist巧Patholo百calchangeinbrainwasobserVedwithli曲tmicroscope7、.R簋ults:Thebrainwatercontentwassigni缸cantlyincreased,theeXpressi叫ofHMGB1、p38MAPK、NF-KBp65a11diNOSwasup‘regulatedin莎oupLascomparedto伊oupC.T11eexpressionleVelsofHMGB1、p38MAPK、NF—KBp65aJldiNOSproteinin伊oupLincreasedat6haRerLPSad而nistration,reachedthepeakat24h,aIldstill
3、、NF-KBp65和iNOS表达下调(尸<0.05)。P组脑组织病理学损伤轻于L组。结论:(1)内毒素可引起大鼠脑损伤,可能与内毒素诱导HMGBl、iNOS表达增加有关,p38MAPK、NF一1(B通路的活化可能参与了其发生发展过程;(2)异丙酚可减轻LPS所致的大鼠内毒素性脑损伤,其机制可能与异丙酚下调HMGBl、iNOS表达,抑制p38MAPK、NF-KB通路的活化,进而减轻炎性反应有关。关键词:异丙酚;脑;脂多糖;HMGBl;iNOSEFFECTS0IFPROpOFOLONLPS.肿UCEDBRAINABsTRACTObjective:ToinVes_tigatet
4、hee舵ctsofpropof01onLPS-inducedbraininju叫inratsaIldthepossiblemechallism.M砌lods:Seventy.twoSprague-Dawleyratsofbothsexes,aged6weeks,wei曲ing200~250g,wereraIldoIIllydiVidedinto3乒oups(n224each):control伊oup(伊oupC)、LPS可oup(伊oupL)、propofol伊叫p(伊oupP).BraininjuWwasproducedbyinjectionofLPSlmg/l(gVi
5、athe1eRint锄alcarotidarteqinLa11dP乒oups.Propofol1OOmg/l【gwaSinjectedintr印嘶toneallyimmediatelyaRertheLPSadlIlinistrationin伊oupP,whiletheequalvolumeofnonnalsalinewas百Veninsteadofpropofolin乒oupL,tlleequalVolumeofnomalsalinewas百VeninsteadofLPSandpropofolin伊oupC.Sixratsineach伊oupweresacnficedat
6、6、24、48aIld72haRerintrap嘶tonealadlllinistration.Tllebrainstisslleswereimmediatelyrelnovedforthedetenninationofwatercontent,theexpressionofI_玎ⅥGBlaJldphosphoqlationofp38MAPKbywestemblot,theexpressionofNF.KBp65andiNOSbyimmunohistochemist巧Patholo百calchangeinbrainwasobserVedwithli曲tmicroscope
7、.R簋ults:Thebrainwatercontentwassigni缸cantlyincreased,theeXpressi叫ofHMGB1、p38MAPK、NF-KBp65a11diNOSwasup‘regulatedin莎oupLascomparedto伊oupC.T11eexpressionleVelsofHMGB1、p38MAPK、NF—KBp65aJldiNOSproteinin伊oupLincreasedat6haRerLPSad而nistration,reachedthepeakat24h,aIldstill
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