简介：AIM:Toelucidatethemechanism(s)bywhichS-adenosyl-L-methionine(SAM)decreaseshepatitisCvirus(HCV)expression.METHODS:WeexaminedtheeffectsofSAMonviralexpressionusinganHCVsubgenomicrepliconcellculturesystem.Huh7HCV-repliconcellsweretreatedwith1mmol/LSAMfordifferenttimes(24-72h),thentotalRNAandproteinswereisolated.cDNAwassynthesizedandrealtime-PCRwasachievedtoquantifyHCV-RNA,superoxidedismutase1and2(SOD-1,SOD-2)catalase,thioredoxin1,methionineadenosyltransferase1Aand2A(MAT1A,MAT2A)expression,andGAPDHandRPS18asendogenousgenes.Expressionofcellularandviralproteinwasevaluatedbywestern-blotanalysisusingantibodiesvsHCV-NS5A,SOD-1,SOD-2,catalase,thioredoxin-1,MAT1A,MAT2A,GAPDHandactin.TotalglutathionelevelsweremeasuredatdifferenttimesbyEllman’srecyclingmethod(0-24h).Reactiveoxidativespecies(ROS)levelswerequantifiedbythedichlorofluoresceinassay(0-48h);Pyrrolidindithiocarbamate(PDTC)wastestedasanantioxidantcontrolandH2O2asapositiveoxidantagent.RESULTS:SAMexpositiondecreasedHCV-RNAlevels50%-70%comparedtonon-treatedcontrols(24-72h).SAMinducedasynergicantiviraleffectwithstandardIFNtreatmentbutitwasindependentofIFNsignaling.Inaddition,1mmol/LSAMexpositiondidnotmodifyviralRNAstability,butitneedscellulartranslationmachineryinordertodecreaseHCVexpression.TotalglutathionelevelsincreaseduponSAMtreatmentinHCV-repliconcells.Transcriptionalantioxidantenzymeexpression(SOD-1,SOD-2andthioredoxin-1)wasincreasedatdifferenttimesbutinterestingly,therewasnosignificantchangeinROSlevelsuponSAMtreatment,contrarytowhatwasdetectedwithPDTCtreatment,whereanaverage40%reductionwasobservedinexposedcells.TherewasaturnoverfromMAT1A/MAT2A,sinceMAT1Aexpressionwasincreased(2.5fold-timesat48h)andMAT2Awasdiminished(from24h)uponSAMtreatmentatboththetranscriptionalandtranslationall

简介：背景:TLR4可介导免疫和炎症反应,TFF3、MUC2为肠黏膜保护因子,维持肠黏膜屏障功能。目的:观察安肠愈疡汤对溃疡性结肠炎大鼠结肠组织中TFF3、MUC2和TLR4基因表达的影响。方法:应用TNBS制备溃疡性结肠炎大鼠模型。将90只Wistar大鼠随机分为空白对照组、模型组、安肠愈疡汤低、中、高剂量组和美沙拉嗪组,分别给予蒸馏水、不同剂量安肠愈疡汤和美沙拉嗪。21d后处死大鼠,行结肠黏膜组织病理学评分,采用RT-PCR法检测结肠组织中TFF3、MUC2和TLR4基因表达。结果:与模型组相比,安肠愈疡汤中、高剂量组和美沙拉嗪组组织病理学评分、TLR4表达均显著降低(P<0.05),TFF3、MUC2表达均显著升高(P<0.05)。与安肠愈疡汤中剂量组相比,安肠愈疡汤高剂量组和美沙拉嗪组组织病理学评分显著降低(P<0.05),TFF3表达显著升高(P<0.01)。与安肠愈疡汤中剂量组和美沙拉嗪组相比,安肠愈疡汤高剂量组MUC2表达显著升高(P<0.01),TLR4表达显著降低(P<0.01)。结论:安肠愈疡汤可明显促进溃疡性结肠炎大鼠结肠黏膜修复,其作用机制可能与上调TFF3和MUC2基因表达以及下调TLR4基因表达有关。