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1、NFκB及其相关炎性因子致大鼠移植肝冷保存损伤的机制作者:蒋安,刘峰,刘昌,宋宇龙,孟珂伟,吕毅蒋安【摘要】目的通过大鼠移植肝在不同冷保存时间再灌注后核因子κB(nucleartranscriptionfactorκB,NFκB)及其相关炎性因子的激活情况,判断冷保存时间、NFκB激活以及移植肝功能损伤三者之间的联系。方法用Wistar大鼠建立原位肝移植模型,假手术组(A组)作为对照组,观察大鼠移植肝在4℃UW液中保存45min(B组)、120min(C组)、180min(D组)以及再灌注3h后肝组织、血清中NFκB、肿瘤坏死因子α(T
2、NFα)、白细胞介素1β(IL1β)和肝损伤指标丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)和肝细胞凋亡的变化情况。结果随着移植肝冷保存时间的延长NFκB逐渐激活(P<0.05),并使肝组织内TNFα、IL1β水平上调(P<0.05);再灌注后,NFκB近一步激活(P<0.05),肝组织中TNFα、IL1β进一步上调(P<0.05),ALT、AST和肝细胞凋亡指数明显升高(P<0.05),肝功能损害加重。结论NFκB在供肝的冷保存阶段随时间的延长呈诱导性激活,再灌注后呈爆发式激活,并通过上调其靶基
3、因TNFα、IL1β的转录产生肝脏损伤,这可能是肝脏冷保存再灌注损伤发生的重要机制。【关键词】肝移植;器官保存;冷保存再灌注损伤;核因子κ14B ABSTRACT:ObjectiveToestablishamodelofratorthotopiclivertransplantationandinvestigatetherelationshipamongcoldpreservationtime,activationofnucleartranscriptionfactorκB(NFκB)anddonorpreservationinjuryaf
4、terlivertransplantation.MethodsOrthotopiclivertransplantationwasperformedinWistarratswhichwererandomlydividedintothefollowinggroupsaccordingtothedifferentdurationoflivercoldstorageinUWsolution:groupA(shamoperation,n=10),groupB(45mincoldstoragegroup,n=10),groupC(120mincoldstorag
5、egroup,n=10),andgroupD(180mincoldstoragegroup,n=10).TheexpressionofNFκBinliverbeforeandaftertransplantationwasmeasuredbyelectrophoreticmobilityshiftassays;proteinexpressionoftumornecrosisfactoralpha(TNFα)andinterleukin1beta(IL1β)intheliverwasmeasuredbyimmunohistochemistry;
6、theserumTNFαandIL1β,alanineaminotransferase(ALT),aspartateaminotransferase(AST)andhepaticcellapoptosiswereexamined.ResultsWithextendedcoldstorageduration,theactivityofNFκBinthedonorliverincreased(P<0.05,groupDvs.groupsA,BandC).TNFαandIL1βlevelsalso14increased(P<0.05,g
7、roupDvs.groupsA,BandC).Donorliverreperfusioninjurywasgraduallyaggravatedwiththeprolongingofgraftcoldpreservation.BoththeserumTNFαandIL1βlevelsincreasedhighly(P<0.05groupAvs.groupsB,CandD),andtheexpressionofNFκBintheliversignificantlyincreased(P<0.05,groupAvs.groupsD,Ba
8、ndC)withgradualprolongingofgraftcoldpreservationtime.T