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: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。
简介:目的探讨微小RNA-363(miR-363)靶向调控E2F转录因子3(E2F3)的表达对HepG2细胞增殖和凋亡的影响。方法体外培养HepG2细胞,采用Lipofectamine法将miR-363抑制剂或其阴性对照转染到HepG2细胞,继续培养48h,收获细胞,采用四噻唑蓝(MTT)法测定细胞增殖率,使用流式细胞术法检测细胞凋亡率,采用实时荧光RT-PCR法检测HepG2细胞miR-363mRNA水平,采用WesternBlot法检测HepG2细胞E2F3、BAX和Caspase-3蛋白表达水平。结果对照组HepG2细胞增殖率为(96.4±9.7)%,显著高于抑制剂处理组【(72.3±6.5)%,P<0.05】,凋亡率为(8.2±1.4)%,显著低于抑制剂处理组【(9.7±0.8)%,P<0.05】;对照组HepG2细胞miR-363mRNA相对水平为(1.0±0.1),显著高于抑制剂处理组【(0.6±0.2),P<0.05】,E2F3蛋白表达量为(1.0±0.1),显著高于抑制剂处理组【(0.6±0.1),P<0.05】,而对照组HepG2细胞Bax和Caspase-3蛋白表达量分别为(0.4±0.0)和(0.5±0.1),均显著低于抑制剂处理组【(0.6±0.1)和(0.7±0.0),P均<0.05】。结论miR-363可靶向调控E2F3的表达,抑制HepG2细胞增殖,诱导其凋亡。本研究结果为肝癌靶向治疗提供了一定的理论依据。
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: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:目的探讨表生长因子受体家族EGFR、HER-2与HER-3蛋白在大肠良恶性肿瘤的相关性表达及临床意义。方法选取肠镜病理证实的大肠增生性息肉114例,大肠腺瘤121例,大肠腺癌120例。应用免疫组织化学方法,单克隆抗体既用型二步法技术,检测EEGFR、HER-2与HER-3蛋白的表达水平。结果EGFR、HER-2与HER-3蛋白表达在增生性息肉组的阳性表达率均较低,分别为35.1%、43.9%与17.5%;大肠腺瘤和大肠腺癌组的阳性表达率均较高,分别为81.8%、78.5%与39.7%和59.2%、76.7%与46.7%。各组间比较有显著差异(P<0.01),EGFR蛋白表达在管状腺瘤与管状绒毛状腺瘤中的阳性表达率显著增高(P<0.01);管状腺瘤与管状绒毛状腺瘤组中的HER-2蛋白表达的阳性率有显著差异(P<0.05),HER-3蛋白表达的阳性率较低,差异无显著性(P>0.05)。大肠癌的病理类型中EGFR、HER-2与HER-3蛋白的阳性表达呈显著相关性(P<0.01)。结论大肠不同性质的粘膜中EGFR家族蛋白的表达起着不同的作用,其表达形式具有不同的特点;大肠癌的发生发展中,三种蛋白在信号传导过程中有共同作用。
简介:目的:研究慢性乙型肝炎患者和慢加急性乙型肝炎肝衰竭(HBV-ACLF)患者外周血单个核细胞(PBMC)Toll样受体2(TLR2)表达,以及鼠三型肝炎病毒(MHV-3)诱导的暴发性肝炎小鼠肝脏TLR2表达的变化。方法收集慢性乙型肝炎和HBV-ACLF患者外周血,分离PBMC,采用实时定量PCR法检测PBMC中TLR2mRNA;给Balb/cJ小鼠腹腔注射MHV-3(100pfu),建立小鼠暴发性肝炎模型,观察感染0、24、48和72h后肝脏TLR2水平变化。结果BALB/cJ小鼠在感染MHV-3后,与0h[(0.39±0.06)%]比,肝细胞TLR2mRNA水平在感染48和72h均显著升高[分别为(9.06±1.60)%和(6.42±2.42)%,P<0.05)],并于48h达最高水平,且两时间点细胞TLR2mRNA水平均与血清ALT和AST水平呈正相关(r=0.804,P<0.01;r=0.797,P<0.01);HBV-ACLF患者PBMC中TLR2mRNA水平显著高于慢性乙型肝炎患者[(5.92±5.26)%对(1.15±1.59)%,P<0.05)]。结论TLR2参与了MHV-3诱导的暴发性肝炎小鼠以及HBV-ACLF患者肝脏损伤的发病过程。
简介:瞄准:在与clinicopathological特征和成纤维细胞生长因素受体1的表示(FGFR1)和ephrinligands的关系在胃的癌症澄清Ephrin受体A4(EphA4)的表示和角色。方法:十一根胃的癌房间线,胃的腺癌的24个配对的外科的新鲜标本并且邻近非,肿瘤组织,74个常规修理福尔马林的、嵌入石蜡的肿瘤标本,和55个标本在组织上看到微数组(TMA)被分析。反向的transcription-PCR(RT-PCR),即时RT-PCR,免疫组织化学,和房间生长试金被执行。结果:EphA4mRNA表示的Overexpression在8被观察(73%)11胃的癌症,房间排队并且10(42%)24胃的癌症纸巾。EphA4的Overexpression,由免疫组织化学分析了,在62被观察(48%)129胃的癌症纸巾。在蛋白质水平,在表示上的EphA4显著地与侵略和复发的深度被联系。在表示上的EphA4也在表示上与FGFR1被相关。有EphA4积极的癌症的病人比有显著地更短的全面幸存时期与EphA4否定的癌症做了那些(P=0.0008)。为ephrinligands的mRNAs是在在胃的癌症房间线和癌症纸巾的各种各样的联合的coexpressed。由在EphA4-overexpressing胃的癌症房间线的siRNA的EphA4表示的Downregulation在房间生长导致了重要减少。结论:我们的结果建议那在胃的癌症在EphA4的表示上起一个作用。
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
简介:AIM:Toevaluatetheroleofsurvivinandcaspase-3inapoptosisofgastriccarcinoma,aswellasinprognosisofpatientswithgastriccarcinoma.METHODS:Expressionsofsurvivinandcaspase-3wereinvestigatedimmunohistochemicallyin80gastriccarcinomapatientswithoutahistoryofchemo-radiationtherapy.TumorcellapoptosiswasexaminedbyTUNELmethod.RESULTS:Immunohistochemicalanalysisshowedthatsurvivinexpressionwaspositivein61of80patients(76%)withgastriccarcinoma.Incontrast,noexpressionofsurvivininadjacentnormaltissueswasdetected.Expressionlevelofcaspase-3washigherinnormaltissuesthanincarcinoma.Patientswithhigherexpressionofsurvivinhadworsehistologicalgradesandpathologicalstages.Expressionofcaspase-3wassignificantlyassociatedwithhistologicalstages,butnotwiththepathologicalstages.Althoughsurvivinexpressionincarcinomawasnotinverselyrelatedtocaspase-3,patientswithsurvivin(-)andcaspase-3(+)hadthemaximumapoptosisindex.CONCLUSION:Expressionlevelofsurvivinwasassociatedwithhistologicalgradesandpathologicalstagesofthetumor,indicatingthatsurvivinmaybeapoorprognosisfactorforgastriccarcinoma.Unlikecaspase-3,survivin(anapoptosisinhibitor)canmarkedlyinhibittheapoptosisoftumorcells.
简介:Medicaltherapyfortype2diabetesmellitusisineffectiveinthelongtermduetotheprogressivenatureofthedisease,whichrequiresincreasingmedicationdosesandpolypharmacy.Conversely,bariatricsurgeryhasemergedasacost-effectivestrategyforobesediabeticindividuals;ithaslowcomplicationratesandresultsindurableweightloss,glycemiccontrolandimprovementsinthequalityoflife,obesity-relatedco-morbidityandoverallsurvival.Thefindingthatglucosehomeostasiscanbeachievedwithaweightloss-independentmechanismimmediatelyafterbariatricsurgery,especiallygastricbypass,hasledtotheparadigmofmetabolicsurgery.However,theprimaryfocusofmetabolicsurgeryisthealterationofthephysio-anatomyofthegastrointestinaltracttoachieveglycemiccontrol,metaboliccontrolandcardio-metabolicriskreduction.Todate,metabolicsurgeryisstillnotwelldefined,asitisusedmostfrequentlyforlessobesepatientswithpoorlycontrolleddiabetes.Themechanismofglycemiccontrolisstillincompletelyunderstood.Publishedresearchfindingsonmetabolicsurgeryarepromising,butmanyaspectsstillneedtobedefined.Thispaperexaminestheproposedmechanismofdiabetesremission,theefficacyofdifferenttypesofmetabolicprocedures,thedurabilityofglucosecontrol,andtherisksandcomplicationsassociatedwiththisprocedure.Weproposeatailoredapproachfortheselectionoftheidealmetabolicprocedurefordifferentgroupsofpatients,consideringtheindicationsandprognosticfactorsfordiabetesremission.
简介:AIM:ToexploreexpressionsofPIK3CAintheprogressionofgastriccancerfromprimarytometastasisanditseffectsonactivationofphosphatidylinositol3-kinase(PI3K)/Aktpathway.METHODS:mRNAandproteinlevelsofPIK3CAwereassessed,respectively,byreal-timequantitativepolymerasechainreactionandimmunohistochemistryinspecimensofnormalgastricmucosa,primaryfociandlymphnodeanddistantmetastasisofgastriccancer.AktandphosphorylatedAktproteinwerealsoexaminedbyWesternblottinginthesetissues,inordertoanalyzetheeffectofPIK3CAexpressionlevelchangesontheactivationofPI3K/Aktsignalingpathway.RESULTS:PIK3CAmRNAinlymphnodemetastasiswereapproximately5and2foldshigher,respectively,thanthatinthecorrespondingnormalgastricmucosaandprimarygastriccancertissues(P<0.05),whilenostatisticalsignificancewasfoundcomparedwithdistantmetastasis.Immunohistochemically,PIK3CAproteinexpressionwasdiscoveredin7(35%)specimensof20primaryfocivs10(67%)of15oflymphnodemetastasisor11(61%)of18ofdistantmetastasis(35%vs67%,P=0.015;35%vs61%,P=0.044).WiththeincreasedlevelofPIK3CAexpression,thetotalAktproteinexpressionremainedalmostunchanged,butp-Aktproteinwasupregulatedmarkedly.CONCLUSION:IncreasedexpressionofPIK3CAisexpectedtobeapromisingindicatorofmetastasisingastriccancer.Up-regulationofPIK3CAmaypromotethemetastasisofgastriccancerthroughaberrantactivationofPI3K/Aktsignaling.