简介：Thispaperaimstotheresearchoftheimpactoffluidshearstressontheadhesionbetweenvascularendothelialcellsandleukocyteinducedbytumornecrosisfactor-α(TNF-α)bymicrofliudicchiptechnology.Microfluidicchipwasfabricatedbysoftlithograph;Endothelialmicrofluidicchipwasconstructedbyoptimizingtypesoftheextracellularmatrixproteinsmodifiedinthemicrochannelandcellincubationtime;humanumbilicalveinendothelialcellsEA.Hy926linedinthemicrochannelwereexposedtofluidshearstressof1.68dynes/cm~2and8.4dynes/cm~2respectively.Meanwhile,adhesionbetweenEA.Hy926cellsandleukocytewasinducedbyTNF-αunderaflowcondition.EA.Hy926cellculturedinthestaticconditionwasusedascontrolgroup.Thenumbersoffluorescently-labeledleukocyteinmicrochannelwerecountedtoquantizetheadhesionlevelbetweenEA.Hy926cellsandleukocyte;cellimmunofluorescencetechniquewasusedtodetecttheintercellularadhesionmolecule(ICAM-1)expression.TheconstructedendothelialmicrofluidicchipcanaffordtothefluidshearstressandrespondtoexogenousstimulusofTNF-α;comparedwiththeadhesionnumbersofleukocyteincontrolgroup,adhesionbetweenEA.Hy926cellsexposedtolowfluidshearstressandleukocytewasreducedunderthestimulusofTNF-αataconcentrationof10ng/ml(P<0.05);leukocyteadhesionwithEA.Hy926cellsexposedtohighfluidshearstresswasreducedsignificantlythanEA.Hy926cellsincontrolgroupandEA.1Hy926cellsexposedtolowfluidshearstress(P<0.01);theregulationmechanismoffluidshearstresstotheadhesionbetweenEA.Hy926cellsandleukocyteinducedbyTNF-αwasthroughthewayofICAM-1.Theendothelialmicrofluidicchipfabricatedinthispapercouldbeusedtostudythefunctionsofendothelialcellinvitroandprovideanewtechnicalplatformforexploringthepathophysiologyoftherelatedcardiovascularsystemdiseasesunderaflowenvironment.

简介：目的探讨NF—κB抑制剂PDTC对高分予量聚乙烯磨损颗粒（UHMWPE）诱导的假体周围界膜组织产生TNF—α的影响，寻找防治假体周围骨溶解的方法。方法用昆明小鼠24只构建air—pouch模型，随机分成两组，每组8只，阳性对照组（囊内注入UHMWPE颗粒悬液，腹腔注射生理盐水）；实验组（囊内注入UHMWPE颗粒悬液，腹腔注射PDTC），阴性对照组（囊内注入生理盐水，腹腔注射PDTC），7天后处死动物，ELISA法检测囊壁组织中TNF—α的含量。结果阳性对照组囊壁组织TNF—α含量为6．3429±0．7475（OD／克）；实验组囊壁组织中TNF—α含量为5．0428±0．8105；阴性对照组囊壁中TNF-α含量为3．5010±0．7248。其中阳性对照组与实验组、阳性对照组与阴性对照组、实验组与阴性对照组之间两两对比均有显著统计学差异（P〈0．01）。结论NF—κB抑制剂PDTC能够抑制UHMWPE颗粒诱导的界膜组织中TNF—α的产生，对假体周围骨溶解有防治作用。