简介：目的观察慢性丙型肝炎患者外周血单个核细胞(PBMC)HCVRNA含量及其对T淋巴细胞亚群的影响,以探讨HCV感染者PBMC中HCVRNA水平及其与机体免疫功能的关系.方法采用荧光定量PCR(FQ-PCR)技术对128例丙型肝炎患者血清、外周血单个核细胞的HCVRBA含量进行了检测,同时检测CD3+、CD4+、CD8+、CD4+/CD8+.结果PBMC内HCVRNA阳性组与HCVRNA阴性组比较,前者CD32+、CD4+水平降低、CD8+水平增高,CD4+/CD8+比值下降大于后者,差异有显著性(P＜0.05).结论丙型肝炎病毒侵染PBMC后可加重患者的细胞免疫功能紊乱.

简介：人端粒保护蛋白1（hPOT1）的主要作用为保护端粒和调节端粒长度。目的：探讨hPOT1在人胃癌细胞中对端粒长度的调节作用及其可能机制。方法：以RNA干扰（RNAi）技术抑制人胃癌细胞株BGC-823中hPOT1的表达．以实时荧光定量聚合酶链反应（PCR）检测细胞端粒长度，以半定量逆转录聚合酶链反应（RT—PCR）检测人端粒酶逆转录酶（hTERT）mRNA表达。结果：以RNAi技术抑制hPOT1表达后，BGC-823细胞端粒长度明显缩短，反映端粒相对长度的T／S值显著小于亲本BGC-823细胞组和阴性对照组（1．383±0．091对2．758±0．647和3．043±0．548，P〈0．05），亲本细胞组与阴性对照组之间则无明显差异。hPOT1RNAi组细胞hTERTmRNA表达亦明显下调。结论：在人胃癌细胞中，hPOT1能正性调节端粒长度；在hPOT1下调引起端粒缩短的环节中，hTERT表达下降可能起一定作用。

简介：AIMToexploretheprotectiveeffectsandunderlyingmechanismsoftotalpolysaccharidesoftheSijunzidecoction(TPSJ)ontheepithelialbarriersinvitro.METHODSCaco-2cellmonolayersweretreatedwithorwithoutTPSJinthepresenceorabsenceofTNF-α,andparacellularpermeabilityandtransepithelialelectricalresistance(TEER)weremeasuredtoevaluatetheepithelialbarrierfunction.Immunofluorescenceandwesternblottingwererespectivelyusedtoevaluatethedistributionandexpressionofthetightjunctionproteinsclaudin1,claudin2,zo3,andoccludininCaco-2cells.Westernblottingwasalsousedtoevaluatethecellularexpressionofmyosinlightchain(MLC),phosphorylatedMLC(pMLC),MLCkinase(MLCK),andnuclearfactor(NF)-κBp65.RESULTSTPSJpromotedtheproliferationofCaco-2cellsandinhibitedTNF-α-inducedsecretionofpro-inflammatorycytokines.Furthermore,TPSJsignificantlyamelioratedboththereductionofTEERandtheincreasedparacellularpermeabilityobservedintumornecrosisfactor(TNF)-α-damagedCaco-2monolayers.Furthermore,TPSJremarkablyattenuatedTNF-α-inducedmorphologicalchanges,downregulatedtheexpressionofclaudin1,claudin2,zo3,andoccludin,andmarkedlysuppressedTNF-α-mediatedupregulationofp-MLCandMLCKexpression.Finally,TPSJinhibitedtheactivationandexpressionofNF-κBp65.CONCLUSIONOurresultsdemonstratethatTPSJalleviatestheTNF-α-inducedimpairmentoftheintestinalepithelialcellbarrierfunctionbysuppressingNF-κBp65-mediatedphosphorylationofMLCKandMLC.