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1、胆盐输出泵在胆道梗阻再通大鼠肝组织中的表达及意义作者:祝建勇别平陈应果冯春林唐春吴乔【摘要】目的探讨胆盐输出泵(BSEP)在胆道梗阻再通大鼠肝组织中的表达及意义。方法将54只Wistar大鼠随机分为假手术(Sham)组、胆总管结扎(CBDL)组、胆道再通(BR)组,测定各时相点血清丙氨酸氨基转移酶(ALT)、总胆汁酸(TBA)以及肿瘤坏死因子(TNFct)的水平,采用RTPCR方法和二步法免疫组化染色分别在基因转录、蛋白表达及肝细胞膜定位上检测BSEP在大鼠肝组织中的表达情况,运用Mias99病理图像分析系统半定量检测BSEP的平均积分光密度仃0D),与TBA和TNFoc作相关分
2、析。结果CBDL术后大鼠血清ALT,TBA及TNFa显著增高(P<0.05);BR术后上述指标逐步好转,7d时仍显著高于Sham组水平(P<0.05)oBSEPmRNA水平随着梗阻时间的延长明显降低(P<0.05),CBDL术后14d仅微弱表达,梗阻解除后缓慢增高;BR术后7d仍未恢复至Sham组水平。免疫组化染色显示BSEP表达定位于肝细胞膜上,变化规律与前述一致,并且与TBA和TNFex呈显著负相关(rl=-0.9257,r2=-0.8536,P<0.05)。结论胆道梗阻再通大鼠模型中胆盐的代谢与BSEP水平密切相关,而TNFa可能是影响BSEP变化的
3、重要因素。【关键词】胆盐输出泵肿瘤坏死因子CX胆道梗阻再通肝组织大鼠【Abstract]ObjectiveToexploretheroleofbilesaltexportpump(BSEP)inrat1iverwithbileductobstructionandbilereflow.MethodsFiftyfourmaleWistarratswererandomizedlydividedintothreegroups,shamgroup,commonbileduct1igation(CBDL)groupandbilereflow(BR)grouptodetectlevelofse
4、rumALT,totalbileacids(TBA)andtumornecrosisfactora(TNFex)ateverytimepoint.ExpressionofBSEPatlevelofgenetranscription,proteinexpressionandhepaticcel1membranelocalizationwasmeasuredbyusingRTPCRandimmunohistochemistrymethod・MeanBSEPIODwasdetectedsemiquantitativelybyusingMias99pathologicalimageana
5、lysissystem.Meanwhile,correlationofBSEPIODwithserumTBAandTNFexwasperformed・ResultsAfterCBDL,levelsofserumALT,TBAandTNFawereascendedsignificantly(P<0.05),whichgotagraduallyfavourableturnbutwasstillhigherthanthatinshamgroupsevendaysafterbilereflow(P&It;0.05).TheexpressionofBSEPmRNAdecreaseda
6、sbileductobstructionelongated(P&It;0.05),increasedslowly14daysafterCBDLandposteriortoobstructionreliefbutdidnotreachlevelofshamgroupsevendaysafterBR.Tmmunohistochemistryresultsshowedasimilartendencytoabovementionedchange,ie,expressionofBSEPwasrestrictivelylocatedonthehepatocytemembrane,whichw
7、asnegativelycorrelatedwithTBAandTNFa(rl=-0.9257,r2=-0.8536,P<0.05).ConclusionBSEPmayberesponsibleforbilesaltmetabolisminratmodelofbileductobstructionandbilereflow,andTNFaplaysanimportantroleinregulatingBSEPexpression.[Keywords!Bilesaltexpo