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时间:2018-08-31
《体外循环对小儿中性粒细胞凋亡及其调控蛋白的影响.doc》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、体外循环对小儿中性粒细胞凋亡及其调控蛋白的影响作者:赵砚丽,李建立,武懿,刘晓明,杜彦茹,闫志军【摘要】目的动态观察患儿在体外循环(extracorporealcirculation,ECC)各时段外周血中性粒细胞(polymorphonuclearneutrophil,PMN)的凋亡率,及其脂肪酸合成酶(Fas)、B细胞淋巴瘤(Bcl-2)蛋白表达的变化规律,为临床从PMN凋亡调控入手防治ECC引发的全身炎性反应(SIRS)提供实验室依据。方法选择择期ECC下行室间隔缺损修补术的患儿30例,采用流式细胞术检测ECC前(T0),ECC开始后30min(
2、T1),停ECC后30min(T2),术后24h(T3)各时点静脉血中PMN的凋亡率、Fas和Bcl-2的表达。结果与T0比较,PMN凋亡率在T2达最低值(P<0.05),与ECC持续时间呈负相关(r=-0.648,P<0.05);与T0比较,PMN膜上Fas阳性表达百分数在T2时点降低(P<0.05),与PMN凋亡率呈正相关(r=0.546,P<0.05);与T0比较,T1、T2、T3时点PMN胞内Bcl-2阳性表达百分数升高(P<0.05),与PMN凋亡率呈负相关(r=-0.569,P<0.05)。结论小儿ECC触发全身炎性反应的过程中产生的多种凋
3、亡抑制因素使PMN凋亡受到抑制,其机制与PMN的Fas表达下调和Bcl-2表达上调有关。【关键词】体外循环;中性粒细胞;细胞凋亡;脂肪酸合成酶;B细胞淋巴瘤EffectsofExtracorporealCirculationonPolymorphonuclearNeutrophilAbstract:OBJECTIVEToinvestigatethechangesinpolymorphonuclearneutrophil(PMN)apoptosisandFas,Bcl-2proteinexpressionofpediatricpatientsunderg
4、oingopen-heartsurgerywithECC,andtogivetheexperimentalbasisfortreatingsystemicinflammatoryreactionsyndrome(SIRS).METHODSThirtypediatricpatientswithventricularseptaldefectundergoingopen-heartsurgerywithECCwerestudied.Bloodsamplesweretakenafterinductionofanesthesia(T0),30minutesaft
5、ertheinitiationECC(T1),30minutesaftertheterminationECC(T2)and24hourspost-operatively(T3).PMNapoptosisandtheexpressionofPMNFas,Bcl-2proteinweredetectedbyflowcytometry.RESULTSComparedwithT0,therateofPMNapoptosisreachedtoitslowestvalueatT2(P<0.05).ThepercentageofPMNapoptosiscorr
6、elatednegativelywiththedurationofECC(r=-0.648,P<0.05).FasonPMNmembraneatT2wassignificantlydownregulatedthanT0.FaslevelscorrelatedpositivelywithPMNapoptosisrate(r=0.546,P<0.05).PMNintracellularexpressionofBcl-2atT1,T2,T3wassignificantlyupregulatedthanT0(P<0.05).Bcl-2leve
7、lscorrelatednegativelywithPMNapoptosisrate(r=-0.569,P<0.05).CONCLUSIONThePMN5apoptosiscanbedelayedbyECC.TheinhibitionofPMNapoptosishasrelationwiththedownregulationexpressionofFasandtheupregulationexpressionofBcl-2.Keywords:Extracorporealcirculation;Polymorphonuclearneutrophil
8、;Apoptosis;Fattyacidsynthetase;Bcelllymphoma-2体
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