创伤感染时巨噬细胞表面模式识别受体表达、相互作用及其与炎症反应发生的关系1杨策陈永华黄宏王海燕谢国旗蒋建新(第三军医大学大坪医院野战外科研究所第四研究室,全军交通医学研究所,创伤、烧伤与复合伤国家重点实验室,重庆400042)摘要:目的从免疫细胞表面模式识别受体水平揭示创伤感染条件下炎症反应的发生机制,为探寻有效调控炎症反应的新措施提供新思路。方法选择小鼠内毒素血症、盲肠结扎穿孔、肺泡巨噬细胞免疫刺激模型,以免疫组织化学法和RT-PCR法检测主要模式识别受体的表达;利用细胞转染模型研究CD14、TLR4、MD2相互作用及其与跨膜信号转导的关系。结果免疫细胞清道夫受体和CD14、TLR4、MD2,分别呈现下调和上调表达,且转染CD14、TLR4和MD2三种表达质粒的HEK293细胞株对FITC-LPS结合率最强(P<0.05)、在内毒素刺激后NF-κB活性、TNF-α分泌最显著(P<0.05)。结论免疫细胞表面防御性受体下调和效应性受体上调参与炎症反应失控过程,调控模式识别受体表达对减轻机体炎性损伤有重要意义。关键词:模式识别受体;内毒素;创伤和损伤中图法分类号:R631.1文献标识码:AExpressionofpatternrecognizationreceptorsonmacrophages,theirinteractionandrelationshipwithdevelopmentofinflammatoryresponseintraumaticinfectionYANGCe,CHENYong-hua,HUANGHong,WANGHai-yan,XIEguo-qi,LIUDa-wei,JIANGJian-xin(StateKeyLaboratoryofTrauma,BurnsandCombinedInjury,ResearchInstituteofSurgery,ResearchinstituteforTrafficMedicineofPLA,DapingHospital,ThirdMilitaryMedicalUniversity,Chongqing400042,China)Abstract:ObjectiveToinvestigatethepossiblemechanismoftraumaticinfection-relatedinflammationviathepatternrecognizationreceptors(PRRs)ininnateimmunocytesandprovidethenewideaforthenewmeasuresinmodulatingtheexcessiveinflammatoryresponses.MethodsThemodelsofendotoxemiamice,cecalligationandpuncture,andimmmuno-stimulatedalveolarmacrophageswereusedfortheassayofPRRswithimmunohistochemistryandreversetranscriptionPCRmethod.HEK293cellsco-transfectedplasmidsexpressingCD14,TLR4andMD2ortwoofthemwerestimulatedwith100ng/mllipopolysaccharide(LPS)forthedeterminationofNF-κBandtumornecrosisfactor(TNF)-α.ResultsSRwasup-regulatedwhiletheexpressionofCD14,TLR4andMD2weredown-regulatedininnateimmunocyte.TheHEK293cellsco-transfectedthreetypesofplasmidsenhancedthesensitivitytoLPSbindingandstimulationcomparedwithHEK293cellsco-transfectedtwoofthem(P<0.05),followedwiththesignificanttranslocationofNF-κBandTNF-αsecretion(P<0.05).ConclusionOurdatastronglyindicatethatthesignificantcorrelationbetweenuncontrolledinflammatoryresponsesandtheimbalancebetweendefensivereceptorsandeffectorrec1基金项目:国家重点基础研究规划项目(2005CB522602,1999054203),全军十一五科技攻关项目(06G080)supportedbytheNationalKeyBasicResearchanddevelopmentPlanofChina(2005CB522602),andtheTacklingProjectofthe“EleventhFive-YearPlan”forSci&TechProjectofPLA(06G080)作者简介:杨策,山西大同市人,博士,助理研究员,主要从事创伤基础方面的研究通信作者:蒋建新,电话:(023)68757401,E-mail:jiangjx@cta.cq.cn---本文来源于网络,仅供参考,勿照抄,如有侵权请联系删除---eptors.ThestrategyofmoderateregulationofPRRscanbeapromisingstrategyinimmuno-modulatinginflammatoryinjuries.Keywords:patternrecognizationreceptors;endotoxin,innateimmune;traumaandinjury模式识别受体是宿主天然免疫系统识别病原菌相关模式分子(PAMPs)、清除病原菌及其毒素以及天然免疫细胞活化的首要环节。机体对细菌细胞壁成分的炎症反应主要由模式识别受体SR、CD14、TLR4等介导。SR和CD14分别在灭活、清除内毒素和巨噬细胞激活中发挥重要作用[1-3],TLR4-MD2复合物能介导CD14传递的细胞膜信号,并将信号进一步传...