简介:Ithasbeenfoundthatexpressionof15-lipoxygenasc-1(15-LOX-1)anditsmainproduct,13-C-hydroxyoctadecadienoicacid(13-S-HODE),aredecreasedinhumancolorectalandesophagealcancersandthatnonsteroidalanti-inflammatorydrugs(NSAIDs)cantherspeuticallyinduce15-LOC-1expressiontotriggerapoptosisinthosecancercellsindependentlyCOX-2.WefoundthataspecificCOX-2inhibitorSC-236similarlyinduceapoptosisingastriccancercells,althoughthemechanismsoftheseeffectsremaintobedefined.Inthepresentstudy,wetestedwhetherSC-236inducedapoptosisthroughup-regulationof15-LOX-1ingastriccancercells.Wefoundthat,(a)SC-236inhibitedgrowthofgastriccancercellsmainlybyapoptosisinduced;(b)SC-236induced15-LOX-1expressionandincreasedendogenous13-S-HODEproduct,insteadof15-S-HETEduringapoptosisingastriccancercellswithout15-LOX-1expressionbeforetreatmentbySC-236;(c)sc-236didn'teffectexpressionofCOX-1,COX-2,5-LOXand12-LOX;and(d)15-LOX-1inhibitionsuppressedSC-236inducedapoptosis.ThesefindingsdemonstratedthatSC-236inducedapoptosisingastriccancercellsviaup-regulationof25-LOX-1.Theyalsosupporttheconceptthatthelossoftheproapopoticroleof15-LOX-1inepithelialcancersisnotlimitedtohumancolorectalandesophagealcancers.
简介:背景:溃疡性结肠炎(UC)是一种慢性非特异性肠道炎症病变,大量研究表明,UC肠黏膜损伤与紧密连接蛋白改变有关。目的:探讨实验性结肠炎大鼠结肠中claudin-1、-2、-4的表达。方法:将40只雌性Wistar大鼠随机分为正常对照组和模型组,给予大鼠7.5mg/mL恶唑酮灌肠制备实验性结肠炎模型,以等量0.9%NaCl溶液灌肠作为正常对照。造模7d后,行大体评分和结肠组织学评分,以ELISA法检测血清和结肠中细胞因子TNF-α、IL-4、IL-5、IL-10含量,免疫组化和蛋白质印迹法检测紧密连接蛋白claudin-1、-2、-4蛋白表达,实时PCR法检测claudin-1、-2、-4mRNA表达。结果:与正常对照组相比,模型组结肠大体评分和组织学评分均显著升高(P〈0.05);血清和结肠组织IL-4和IL-5含量均显著增高(P〈0.05),而两组TNF-α和IL-10含量无明显差异(P〉0.05);claudin-1、-4mRNA和蛋白表达显著降低(P〈0.05),claudin-2mRNA和蛋白表达显著增高(P〈0.05)。结论:实验性结肠炎大鼠中紧密连接蛋白claudin-1、-2、-4的分布和表达发生改变,导致肠黏膜屏障功能受损,有望作为UC治疗的潜在靶点。
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:目的观察早期胃癌组织中GTP酶激活蛋白SH3功能区结合蛋白G3BP1和G3BP2的表达变化并探讨其意义。方法选择早期胃癌组织89例和正常对照组织35例,采用免疫组织化学方法检测两组G3BP1蛋白和G3BP2蛋白的表达情况。结果早期胃癌组和正常组G3BP1的阳性率分别为87.64%和60.00%,G3BP2阳性率分别为86.51%和54.28%,两组比较差异有统计学意义(P=0.000,0.000);早期胃癌G3BP1和G3BP2的表达均与幽门螺杆菌感染相关(P=0.000);早期胃癌组织中G3BP1与G3BP2表达呈正相关(rs=0.252,P=0.017)。结论早期胃癌组织中G3BP1和G3BP2呈高表达,可能与幽门螺杆菌感染紧密相关,两指标异常表达可能在早期胃癌的发生和发展中起重要作用。
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:瞄准:与ulcerative(UC)在病人的结肠的粘膜检验metalloproteinase-1(MMP-1)和metalloproteinase-1(TIMP-1)的织物禁止者的表示。方法:颠倒抄写聚合酶链反应(RT-PCR),免疫组织化学被用来与UC和控制在病人在mRNA和蛋白质层次学习MMP-1和TIMP-1的表达式。在MMP-1mRNA,TIMP-1mRNA,MMP-1mRNA/TIMP-1mRNA比率和有UC的病人的临床的症状的严厉之间的关系也被分析。结果:MMP-1mRNA和TIMP-1mRNA在的表示溃烂并且煽动了结肠的粘膜在非煽动的结肠的粘膜比那显著地高(P<0.001),但是有不,统计上,在UC病人和正常的非煽动的结肠的粘膜的有效差量控制(P>0.05)。在UC病人的溃烂的结肠的粘膜的MMP-1和TIMP-1的mRNA表达式被80褶层和2.2褶层增加,分别地什么时候与正常控制相比。在煽动的结肠的粘膜,增加分别地是30褶层和1.6褶层。Immunohistochemical分析显示出那在之中溃烂,发炎,并且UC病人的非煽动的结肠的mucosae和正常控制,MMP-1表示的积极的率分别地是87%,87%,40%和35%,并且TIMP-1表示的积极的率分别地是89%,89%,80%和75%。而且,MMP-1mRNA,TIMP-1mRNA和MMP-1mRNA/TIMP-1mRNA比率的表示与临床的症状(P<0.05)的严厉被相关。结论:在结肠的粘膜在UC病人引起细胞外的矩阵(ECM)和溃疡的过多的水解作用的diseased的MMP-1的过多的表示。MMP-1mRNA,TIMP-1mRNA和MMP-1mRNA/TIMP-1mRNA比率能被用作简历标记与UC在病人判定临床的症状的严厉。外长的TIMP-1或MMP-1禁止者治疗是为有UC的病人的新奇治疗。
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:AIMToinvestigatetherolesandinteractionsofmutThomolog(MTH)-1andhypoxia-induciblefactor(HIF)-1αinhumancolorectalcancer(CRC).METHODS:TheexpressionanddistributionofHIF-1αandMTH-1proteinsweredetectedinhumanCRCtissuesbyimmunohistochemistryandquantitativerealtimepolymerasechainreaction(qRT-PCR).SW480andHT-29cellswereexposedtonormoxiaorhypoxia.ProteinandmRNAlevelsofHIF-1αandMTH-1wereanalyzedbywesternblottingandqRT-PCR,respectively.InordertodeterminetheeffectofHIF-1αontheexpressionofMTH-1andtheamountof8-oxodeoxyguanosinetriphosphate(dGTP)inSW480andHT-29cells,HIF-1αwassilencedwithsmallinterferingRNA(siRNA).GrowthstudieswereconductedoncellswithHIF-1αinhibitionusingaxenografttumormodel.Finally,MTH-1proteinwasdetectedbywesternblottinginvivo.RESULTS:HighMTH-1mRNAexpressionwasdetectedin64.2%ofcases(54/84),andthiswassignificantlycorrelatedwithtumorstage(P=0.023)andsize(P=0.043).HIF-1αproteinexpressionwascorrelatedsignificantlywithMTH-1expression(R=0.640;P〈0.01)inhumanCRCtissues.HypoxicstressinducedmRNAandproteinexpressionofMTH-1inSW480andHT-29cells.InhibitionofHIF-1αbysiRNAdecreasedtheexpressionofMTH-1andledtotheaccumulationof8-oxo-dGTPinSW480andHT-29cells.Intheinvivoxenografttumormodel,expressionofMTH-1wasdecreasedintheHIF-1αsiRNAgroup,andthetumorvolumewasmuchsmallerthanthatinthemocksiRNAgroup.CONCLUSION:MTH-1expressioninCRCcellswasupregulatedviaHIF-1αinresponsetohypoxicstress,emphasizingthecrucialroleofHIF-1α-inducedMTH-1intumorgrowth.
简介:AIMTodeterminetheroleofcorticotropinreleasingfactorreceptor(CRF2)inepithelialpermeabilityandenterocytecelldifferentiation.METHODSForthispurpose,weusedratSpragueDawleyandvariouscoloncarcinomacelllines(SW620,HCT8R,HT-29andCaco-2celllines).ExpressionofCRF2proteinwasanalyzedbyfluorescentimmunolabelinginnormalratcolonandthenbywesternblotindissociatedcolonicepithelialcellsandinthelysatesofcoloncarcinomacelllinesorduringtheearlydifferentiationofHT-29cells(tenfirstdays).ToassesstheimpactofCRF2signalingoncoloniccelldifferentiation,HT-29andCaco-2cellswereexposedtoUrocortin3recombinantproteins(Ucn3,100nmol/L).Insomeexperiments,cellswerepre-exposedtotheastressin2b(A2b)aCRF2antagonistinordertoinhibittheactionofUcn3.Intestinalcelldifferentiationwasfirstanalyzedbyfunctionalassays:thetrans-cellularpermeabilityandthepara-cellularpermeabilityweredeterminedbyDextran-FITCintakeandmeasureofthetransepithelialelectricalresistancerespectively.Morphologicalmodificationsassociatedtoepithelialdysfunctionwereanalyzedbyconfocalmicroscopyafterfluorescentlabelingofactin(phaloidin-TRITC)andintercellularadhesionproteinssuchasE-cadherin,p120ctn,occludinandZO-1.Theestablishmentofmatureadherensjunctions(AJ)wasmonitoredbyfollowingthedistributionofAJproteinsinlipidraftfractions,afterseparationofcelllysatesonsucrosegradients.Finally,themRNAandtheproteinexpressionlevelsofcharacteristicmarkersofintestinalepithelialcell(IEC)differentiationsuchasthetranscriptionalfactorkrüppel-likefactor4(KLF4)orthedipeptidylpeptidaseIV(DPPIV)wereperformedbyRT-PCRandwesternblotrespectively.ThespecificactivitiesofDPPIVandalkalinephosphatase(AP)enzymesweredeterminedbyacolorimetricmethod.RESULTSCRF2proteinispreferentiallyexpressedinundifferentiatedepithelialcellsfromthecryptsofcolonandinhumancoloncarcinoma