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:目的观察分子吸附再循环系统(MARS)对肝衰竭患者Th1/Th2型细胞因子水平的影响,探讨MARS在肝衰竭治疗中的临床价值。方法28例肝衰竭患者接受MARS治疗,采用ELISA法测定血清TNF-α、IFN-γ、IL-6、IL-10和IL-12水平,比较其在治疗前后的变化。结果在MARS治疗结束时,患者血清TNF-α、IFN-γ、IL-6水平分别为(40.3±3.7)pg/ml、(25.9±1.9)pg/ml、(33.6±2.5)pg/ml,显著低于治疗前【(81.5±6.2)pg/ml、(49.3±2.2)pg/ml、(66.8±4.1)pg/ml,P均〈0.01】;治疗结束时血清IL-10和IL-12水平分别为(39.3±2.6)pg/ml和(168.7±8.5)pg/ml,显著高于治疗前【(37.1±1.9)pg/ml和(98.6±6.5)pg/ml,P〈0.01】;在MARS治疗结束后7d,患者TNF-α、IFN-γ、IL-6、IL-10和IL-12水平分别为(80.3±3.9)pg/ml、(48.6±2.1)pg/ml、(65.1±2.4)pg/ml、(38.4±2.2)pg/ml、(99.8.6±7.9)pg/ml,与治疗前相比,差异无显著性(P〉0.05)。结论MARS治疗肝衰竭患者有利于纠正失衡的Th1/Th2型细胞因子水平,减轻免疫反应对肝组织的损伤,为肝细胞再生提供机会。
简介:AIMToinvestigatetheroleofthecomplement5a(C5a)/C5areceptor(C5aR)pathwayinthepathogenesisofacuteliverfailure(ALF)inamousemodel.METHODSBALB/cmicewererandomlyassignedtodifferentgroups,andintraperitonealinjectionsoflipopolysaccharide(LPS)/D-galactosamine(D-GalN)(600mg/kgand10μg/kg)wereusedtoinduceALF.TheKaplanMeiermethodwasusedforsurvivalanalysis.Serumalanineaminotransferase(ALT)levels,atdifferenttimepointswithina1-wkperiod,weredetectedwithabiochemistryanalyzer.Pathologicalexaminationoflivertissuewasperformed36hafterALFinduction.Serumcomplement5(C5),C5a,tumornecrosisfactor-α(TNF-α),interleukin(IL)-1β,IL-6,high-mobilitygroupproteinB1(HMGB1)andsphingosine-1-phosphatelevelsweredetectedbyenzyme-linkedimmunosorbantassay.Hepaticmorphologicalchangesat36hafterALFinductionwereassessedbyhematoxylinandeosinstaining.ExpressionofC5aR,sphingosinekinase1(SphK1),p38-MAPKandp-p38-MAPKinlivertissue,peripheralbloodmononuclearcells(PBMCs)andperitonealexudativemacrophages(PEMs)ofmiceorRAW264.7cellswasanalyzedbywesternblotting.C5aRmRNAlevelsweredetectedbyquantitativereal-timePCR.RESULTSActivationofC5andup-regulationofC5aRwereobservedinlivertissueandPBMCsofmicewithALF.BlockadeofC5aRwithaC5aRantagonist(C5aRaC5aRa)significantlyreducedthelevelsofserumALT,inflammatorycytokines(TNF-α,IL-1βandIL-6)andHMGB1,aswellasthelivertissuedamage,butincreasedthesurvivalrates(P<0.01forall).BlockadeofC5aRdecreasedSphK1expressioninbothlivertissueandPBMCssignificantlyat0.5hafterALFinduction.C5aRapretreatmentsignificantlydownregulatedthephosphorylationofp38-MAPKinlivertissuesofALFmiceandC5astimulatedPEMsorRAW264.7cells.Moreover,inhibitionofp38-MAPKactivitywithSB203580reducedSphK1proteinproductionsignificantlyinPEMsafterC5astimulation.CONCLUSIONTheC5a/C5aRpath
简介:背景:XPO1(exportin1)是核质转运的重要介质之一,在多种人类恶性肿瘤中表达增高,参与肿瘤发生、发展进程,是恶性肿瘤的潜在治疗靶点。目的:探讨XPO1在人胰腺癌细胞中的表达、定位以及XPO1抑制剂KPT-330对肿瘤细胞增殖和凋亡的影响。方法:以蛋白质印迹法检测6株人胰腺癌细胞株和2株人永生化正常胰腺导管上皮细胞株中的XPO1表达,选择XPO1表达量最高的人胰腺癌细胞株MIAPaCa-2进行后续实验。予MIAPaCa-2细胞不同浓度KPT-330(0.03、0.3、3μmol/L)或DMSO处理,免疫荧光实验检测XPO1在细胞中的分布,CCK-8实验和克隆形成实验检测细胞增殖,流式细胞分析检测细胞周期和细胞凋亡,蛋白质印迹法检测XPO1和凋亡相关蛋白caspase-3、PARP表达变化。结果:XPO1主要聚集分布于MIAPaCa-2细胞的核膜,经KPT-330处理后,XPO1的核膜高聚现象消失。与DMSO组相比,KPT-330可抑制MIAPaCa-2细胞的XPO1表达,并能抑制细胞增殖,诱导细胞凋亡,作用呈浓度依赖性。机制研究显示KPT-330可诱导MIAPaCa-2细胞发生细胞周期S期阻滞,上调cleaved-caspase-3、cleaved-PARP表达。结论:XPO1抑制剂KPT-330可能通过调节细胞周期分布、诱导细胞凋亡而抑制人胰腺癌细胞增殖。
简介:目的探究甘草酸镁注射液联合序贯血液净化疗法对急性肝衰竭患者清蛋白(A1b)及凝血酶原活动度(PTA)水平的影响。方法选取2015年5月至2017年11月我院62例急性肝衰竭患者,依据随机数表法将患者分为观察组与对照组,各31例。对照组予以异甘草酸镁注射液治疗,观察组于异甘草酸镁注射液治疗基础上予以序贯血液净化疗法治疗。对比两组治疗效果、不良反应发生情况及治疗前、疗程结束后谷草转氨酶(AST)、总胆红素(TBil)、谷丙转氨酶(ALT)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、A1b及PTA水平的变化。结果观察组总有效率为83.87%,显著高于对照组的61.29%(P〈0.05)。两组疗程结束后AST、ALT、TBil水平均较治疗前有所降低(P〈0.05),且观察组更为显著(P〈0.05);两组疗程结束后PTA、A1b水平均较治疗前有所升高(P〈0.05),且观察组升高更为显著(P〈0.05);两组疗程结束后IL-6、TNF-α水平均较治疗前有所降低(P〈0.05),且观察组降低更为显著(P〈0.05)。观察组不良反应率为22.58%,与对照组的12.90%相比,差异无统计学意义(P〉0.05)。结论异甘草酸镁注射液联合序贯血液净化疗法治疗急性肝衰竭患者,可显著改善患者肝功能及凝血功能,明显降低血清IL-6、TNF-α水平,效果更为显著,且安全性较高,值得临床推广应用。