简介:Someantitumoractivitiesofcomponent(E),extractedfromtherootofFagopynumCymosum(Trev)Meisn(FCTM),haverecentlybeendiscoveredinvivoandinvitro.ThecomponentE(CE)’spatternofactionwithtumorcellularDNAatthemolecularpharmacologicallevelwasinvestigatedbymacromolecularsynthesisexperiment(MSE)andhumanDNAinteractionsystemestablishedinourlaboratory.Theexperimentsdemonstratedthat,invitro,theagentcouldmarkedlyinhibittheincorporationof3H-TdRintothecellularDNA,andtheIC50inP388leukemiacellandinSGC-7901cellwas17.86μg/mland110.4μg/ml,respectively.Theagent,atmg/mllevel,couldproduceanintercalationreversionpatternwithDNAwithinashorttime(2hours).Butwhentheintervalwasprolongedforover4hours,theactionchangedtointercalationirreversiblepattern.Accordingtotheseobservations,theauthorsinferthatCEinteractswithDNAintwoways-directlyandindirectly.Theindirectaction,especiallyinlowconcentr
简介:ToleamwhetherHPV16E6/E7genescorrelatewithcervicalcarcinomaandprecancerouslesions.MethodsAmplificationandcloningofHPV16E6/E7geneswereperformedbyPCRandmolecularbiologicaltechniquesfortheirsequences.Cervicalcancer,CINⅡ-Ⅲandcervicitiswereconfirmedbypathologicdetections.ResultsDetectionratesofHPV16E6/E7inbiopsiesofcervicalcarcinoma,CINⅡ-Ⅲandcervicitiswereindividually70%,75%and65%.StatisticresultsshowthatthereisnodifferenceamongtheminHPV16E7detection.AlsotherisnodifferencebetweencervicalcancerandCINⅡ-ⅢinHPV16E6detection,however,bothwerehigherdetectionsthanincervicitisstatistically.ConclusionHPV16E6/E7genescorrelatewithcervicalcarcinomaandprecancerouslesions.E6genemightespeciallyfunctiononoccurrenceofcervicalcarcinomafromprecancerouslesions.
简介:HBeAg阴性慢性乙型肝炎是慢性乙型肝炎中的一个重要临床类型,表现为表面抗原(HbsAg)、乙型肝炎病毒DNA(HBVDNA)阳性、HBeAg阴性伴或不伴HbeAb阳性和丙氨酸氨基转移酶(ALT)升高、肝组织学活动性炎症.HBeAg阴性慢性乙型肝炎流行性广,世界各地流行率差异性较大.据报道,地中海地区HBeAg阴性慢性乙型肝炎占全部慢性乙型肝炎的33%,亚太地区占15%,美国和北欧占14%[1].我国也是HBeAg阴性慢性乙型肝炎的高发区.Chan等[2]报道,HBeAg阴性慢性乙型肝炎在香港流行率为69%.HBeAg阴性慢性乙型肝炎进展快,易发展至肝硬化、肝癌等终末期肝病,治疗困难.本文就国内有关HBeAg阴性慢性乙型肝炎的治疗进展作一综述.
简介:目的研究钙粘蛋白(E-CD)及相关蛋白α-,β-和γ-连环蛋白(catenin)胃癌中的表达并探讨这些分子与各种临床病理特征的关系。方法采用免疫组织化学染色(Envision二步法)对62例胃癌进行了E-CD,α-catenin、β-catenin和γ-catenin蛋白表达的检测。结果在62例胃癌中,E-CD、α-catenin、β-catenin和γ-catenin蛋白的阳性表达率分别为64.5%、48.3%、25.8%和87%。E-CD在管状腺癌、低分化腺癌和粘液腺癌中的阳性表达率分别为83.3%、35.796和41.6%;在管状腺癌、低分化腺癌和粘液癌中的阳性表达率分别为69.4%、21.4%和16.6%。E-CD和α-catenin在管状腺癌中的表达显著高于低分化腺癌和粘液腺癌(P<0.05和P<0.01)。E-CD、α-、β-和γ-catenin的表达与肿瘤分期、淋巴结转移、淋巴管浸润、神经浸润无显著相关性。尽管β-catenin表达与其他临床病理特征无明显联系,但随胃癌分化程度的降低,其表达明显下降。结论细胞粘附分子如E-CD、α-catenin和B—catenin表达的降低与胃癌的发生和发展密切相关,E-cadherin-catenin复合物的功能丧失与胃癌中的肿瘤浸润有一定联系。
简介:目的研究E-cad在食管鳞状细胞癌中的表达及意义。方法免疫组化SABC法检测76例食管癌E-cad的表达。结果正常食管粘膜细胞膜E-cad表达呈阳性。在癌组织中,E-cad细胞膜表达减弱。E-cad减弱表达率为65.8%(50/76),E-cad表达与病理分化程度(P=0.02)、漫润深度(P=0.024)、静脉侵犯(P=0.04)、淋巴结转移(P=0.022)和临床分期(P=0.04)具有相关性;而与年龄、性别、病理类型无关(P>0.05)。在无淋巴结转移组E-cad表达降低占56.25%(27/48),有淋巴结转移组占82.14%(23/28),两者之间表达差异有显著性;有静脉侵犯组E-cad表达降低率为92.86%(13/14)和无静脉侵犯组为59.68%(37/62),两者之间差异有显著性。结论E-cad减弱表达与食管癌生物学行为有关,可能为食管癌预后差的因素之一。
简介:TostudytheexpressioncharacteristicofJapaneseencephalitisvirus(JEV)prMEandEproteinsandtheefficacyofDNAimmunizationbydifferentrecombinantplasmidscontainingJEVprME(2001bp)andE(1500bp)genes,tworecombinants(pJMEandpJE)containingJEVprMEandEgenesfusedwithFLAGwereconstructedandthentransfectedintoHepG2andCOS-1cellsbylipnsomefusion.TheexpressionfeatureofFLAG-prME(about72kDa)andFLAG-E(about54kDa)proteinsintransfectedcellswereanalyzedbyWesternblotandtwoantibodysystems(anti-FLAGandanti-E).BALB/cmicewereimmunizedwith100μgoftwokindsofrecombinantsbyintramuscularinjection,andJEVJaGAr-01strains(10^5PFU/100μl)weregiventoBALB/cmicebyintraperionealinjection3wkaftertwiceDNAimmunizationbyalethalviruschallenge.BALB/cmicewereobservedfor21daysafterchallenge.80%plaquereductionneutralizationtestwasperformedtotitrateneutralizationantibodybeforeandafterviralchallenge.ItwasfoundthattheexpressionofproteinsassociatedwithpJMEandpJEwasdeterminedintransfectedcellswithanti-FLAGandanewproteinof11kDawasdetectedinHepG2andCOS-1cellstransfectedwithpJME.OnlyE(53kDa)proteinwasidentifiedastransfectedwithpJMEusingantiE.HigherlevelofneutralizationantibodiesandtheefficacyofprotectiveimmunitywereinducedwithpJMEimmunization,andweresimilartothoseinducedbyinactivatedJapaneseencephalitisvaccine,butwerebetterthanthoseinducedwithpJE.ItconcludesthattheexpressionlevelfromprMtoEproteinsofJEVisdifferentinvitro,andtheinvitroexpressionefficiencyofpJMEwasbetterthanthatofpiE.FLAG-prMEproteinexpressedbypJMEcouldbecleavedbypeptidasefromhost.TheefficacyofDNAimmunizationiscorrelatedtotheexpressioncharacterizationofrelatedproteinsexpressedinvitro.