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1、氯胺酮对严重烧伤大鼠脑组织HSP70表达的影响【摘要】目的研究氯胺酮对严重烧伤大鼠脑组织HSP70表达的影响,探讨氯胺酮对烧伤后脑组织保护作用的机制。方法124只雄性Wistar大鼠随机分为正常对照组(N组)(n=20),烧伤对照组(B组)(n=52)和烧伤氯胺酮组(BK组)(n=52)3组。其中B组和BK组大鼠以92℃水浴,18s烫伤,制成总体表面积为30%的Ⅲ度烧伤模型。BK组于建模成功后15min给予氯胺酮40mg/kg,而B组则于建模成功后15min给予与氯胺酮等体积的生理盐水,均左股部肌肉注射。其中B组和BK组分别于给药3,6,12,24h后处死大
2、鼠,采集脑组织,每组各时间点8只大鼠。用Westernblot检测脑组织HSP70的表达。其余的大鼠分别在3h,6h,12h,24h,2d,4d,8d,10d观察各组的存活率。结果(1)大鼠严重烧伤后脑组织HSP70表达的比较:BK组和B组的HSP70表达在3,6,12,24h强于N组(P<0.05),12h达高峰;BK组HSP70表达在3,6h强于B组(P<0.05);(2)各组大鼠存活率的比较:N组全部存活;BK组和B组的存活率在3h,6h,12h,24h,2d,4d,8d差异无统计学意义(P>0.05);而BK组存活率在10d显著高于B组(P<0.05
3、)。结论氯胺酮可增强严重烧伤早期大鼠脑组织HSP70的表达,可能是氯胺酮保护烧伤后脑组织的机制之一。【关键词】氯胺酮;热休克蛋白70;烧伤;脑EffectofketamineoncerebralHSP70expressioninratsaftersevereburnsZHANGMeng-yuan.DepartmentofAnesthesiology,ProvincialHospitalAffiliatedtoShandong__________________________基金项目:山东省科技厅基金资助项目(2002BB1DBB2)作者单位:通信作者:张孟
4、元,250021济南市,山东省立医院麻醉科(E-mail:zmymz@163.com)University,Jinan250021,China【Abstract】ObjectiveToinvestigatetheeffectofketamineoncerebralHSP70expressioninratsaftersevereburnsandtoexploreitspossiblemechanismofcerebralprotectionaftersevereburns.MethodsOnehundredandtwenty-fourmaleWistarrat
5、swererandomlydividedinto3groups:normalcontrolgroup(GroupN)(n=20),burnedcontrolgroup(GroupB)(n=52)andburns-ketaminegroup(GroupBK)((n=52).TheBandBKgroupsofratswerescaldedinwaterat92℃for18seconds,whichresultedinafull-thicknessburninvolving30%totalbodysurfacearea.TheBKgroupofratswasinj
6、ectedwithkatemine(40ml/kgim)immediately15minutesaftertheburninjury.TheBgroupwasinjectedwithsaline(thesamevolumeofthekatemine).Thetwogroupsofratswererespectivelysacrificedat3,6,12and24hafteradministration.Therewere8ratsateachtimepointofthetwogroups.Braintissueswerecollectedfromallgr
7、oupsforHSP70detectionbyWesternblotanalysis.Survivalratesoftheotherratsofeachgroupweremeasuredat3h,6h,12h,24h,2d,4d,8d,10d.Results (1)ComparisonofHSP70expressioninratsaftersevereburns:TheHSP70expressionwashigherinGroupBKandBthanthatinGroupNat3,6,12and24h(P<0.05).Itreachedthepeakat12
8、hafteradministration.TheHS