简介：背景：维生素D受体（VDR）属于类固醇激素受体超家族，参与细胞增殖、分化、凋亡以及免疫应答等多种生物学过程，在多种恶性肿瘤中呈低表达。目的：探讨VDR在结直肠癌中的表达及其调控机制。方法：收集2010年2月-2012年12月上海交通大学医学院附属仁济医院收治的结直肠癌患者30例，以免疫组化法检测癌组织和相应癌旁非癌组织标本的VDR表达情况。从基因表达汇编（GEO）数据库中提取224例结直肠癌患者的临床资料，分析其癌组织VDR表达与患者临床病理特征和生存期的关系。采用组蛋白-赖氨酸N-甲基转移酶EZH2-siRNA或5-氮杂胞嘧啶核苷（5-AZA）处理人结肠癌细胞株HCT116和SW620，以实时PCR检测VDR表达水平，以甲基化特异性PCR（MSP）检测VDR启动子区甲基化水平。结果：结直肠癌患者癌组织VDR阳性表达率显著低于癌旁非癌组织（26.7%对70.0%，P〈0.001）。结直肠癌组织VDR表达与肿瘤组织学分期、远处转移、脉管转移、淋巴结转移呈负相关（P〈0.05）；VDR高表达者生存期显著长于低表达者（P=0.032）。与转染对照-siRNA相比，HCT116、SW620细胞转染EZH2-siRNA后，EZH2mRNA表达水平和VDR启动子区甲基化水平均显著降低（P〈0.05），VDRmRNA表达水平显著升高（P〈0.05）。5-AZA处理HCT116、SW620细胞后，VDR启动子区甲基化水平较阴性对照组显著降低（P〈0.05），VDRmRNA表达水平显著升高（P〈0.05）。结论：结直肠癌中VDR表达下调且与患者预后呈正相关。VDR在结直肠癌中的转录抑制受组蛋白甲基化和DNA甲基化共同调控。

简介：AIM:ToelucidatethemolecularmechanismsunderlyinghepatitisBvirus(HBV)occultinfectionofgenotypeC.METHODS:Atotalof10typesofhepatitisBsurfaceantigen(HBsAg)variantsfromaKoreanoccultcohortwereused.AfteracompleteHBVgenomeplasmidmutatedsuchthatitdoesnotexpressHBsAgandplasmidencoding,eachHBsAgvariantwastransientlyco-transfectedintoHuH-7cells.ThesecretioncapacityandintracellularexpressionoftheHBVvirionsandHBsAgsintheirrespectivevariantswereanalyzedusingreal-timequantitativepolymerasechainreactionassaysandcommercialHBsAgenzyme-linkedimmunosorbentassays,respectively.RESULTS:AllvariantsexhibitedlowerlevelsofHBsAgsecretionintothemediumcomparedwiththewildtype.Inparticular,ineightofthetenvariants,verylowlevelsofHBsAgsecretionthatweresimilartothenegativecontrolweredetected.Incontrast,mostvariants(9/10)exhibitednormalvirionsecretioncapacitiescomparablewith,orevenhigherthan,thewildtype.ThisprovidednewinsightintotheintrinsicnatureofoccultHBVinfection,whichleadstoHBsAgsero-negativenessbuthashorizontalinfectivity.Furthermore,mostvariantsgeneratedhigherreactiveoxidativespeciesproductionthanthewildtype.ThisfindingprovidespotentiallinksbetweenoccultHBVinfectionandliverdiseaseprogression.CONCLUSION:ThepresentlyobtaineddataindicatethatdeficiencyinthesecretioncapacityofHBsAgvariantsmayhaveapivotalfunctionintheoccultinfectionsofHBVgenotypeC.

简介：AIM:ToinvestigatetheroleoftheoverexpressionofB7-H3inapoptosisincolorectalcancercelllinesandtheunderlyingmolecularmechanisms.METHODS:SW620cellsthathighlyoverexpressedB7-H3(SW620-B7-H3-EGFP)andHCT8cellsstablytransfectedwithB7-H3shRNA(HCT8-shB7-H3)werepreviouslyconstructedinourlaboratory.CellstransfectedwithpIRES2-EGFPwereusedasnegativecontrols(SW620-NCandHCT8-NC).Real-timePCRandwesternblottinganalysiswereusedtodetectthemRNAandproteinexpressionsoftheapoptosisregulatorproteinsBcl-2,Bcl-xlandBax.Acellproliferationassaywasusedtoevaluatethesurvivalrateanddrugsensitivityofthecells.Theeffectofdrugresistancewasdetectedbyacellcycleassay.Activecaspase-3westernblottingwasusedtoreflecttheanti-apoptoticabilityofcells.WesternblottingwasalsoperformedtodeterminetheexpressionofproteinsassociatedwiththeJak2-STAT3signalingpathwayandtheapoptosisregulatorproteinsafterthetreatmentwithAG490,aJak2specificinhibitor,inB7-H3overexpressingcells.ThedatawereanalyzedbyGraphPadPrism6usinganon-pairedt-test.RESULTS:WhetherbyoverexpressioninSW620cellsordownregulationinHCT8,B7-H3significantlyaffectedtheexpressionofanti-andpro-apoptoticproteins,atboththetranscriptionalandtranslationallevels,comparedwiththenegativecontrol(P<0.05).AcellproliferationassayrevealedthatB7-H3overexpressionincreasedthedrugresistanceofcellsandresultedinahighersurvivalrate(P<0.05).Inaddition,theresultsofcellcycleandactivecaspase-3westernblottingprovedthatB7-H3overexpressioninhibitedapoptosisincolorectalcancercelllines(P<0.05).B7-H3overexpressionimprovedJak2andSTAT3phosphorylationand,inturn,increasedtheexpressionofthedownstreamanti-apoptoticproteinsB-cellCLL/lymphoma2(Bcl-2)andBcl-xl,basedonwesternblotting(P<0.05).AftertreatingB7-H3overexpressingcellswiththeJak2-specificinhibitorAG490,thephosphorylationofJak2andSTAT3,andtheexp

简介：目的：探索阿德福韦酯（ADV）在不同时期联合聚乙二醇干扰素α-2a治疗HBeAg阳性的高病毒载量的慢性乙型肝炎患者的疗效。方法28例A组患者在开始治疗时给予ADV和聚乙二醇干扰素α-2a联合治疗，29例B组患者开始只给予ADV治疗，在经过平均（11.8±3.2）w治疗使血清HBVDNA≤4lgIU/ml时，再加入聚乙二醇干扰素α-2a治疗，两组均治疗48w。结果两组基线HBsAg定量分别为（4583.2±1749.3）IU/ml和（4620.3±1812.4）IU/ml，差异无统计学意义（P＞0.05），治疗结束时分别为[（759.4±72.3）IU/ml和（467.6±56.9）IU/ml，P±0.05]；A组HBsAg血清转换率和HBeAg血清转换率分别为7.1%和35.7%，显著低于B组的（20.7%和62.1%，P±0.05）；两组ALT复常率和HBVDNA阴转率无显著性相差（P＆gt;0.05）。结论对于HBeAg阳性的高病毒载量的慢性乙型肝炎患者，先经ADV治疗降低HBVDNA载量后再联合聚乙二醇干扰素α-2a治疗，可能经济、有效。