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简介：肿瘤的形成是原癌基因和抑癌基因遗传性变化如增加、丢失、突变，逐步积累的过程。同时，肿瘤又是遗传因素和后天因素共同作用的多因子疾病。p53是一个肿瘤抑制蛋白，它首先可通过影响编码细胞周期相关蛋白质的基因表达来调控细胞周期的G1停滞．同时它还会因为DNA的损伤增多．诱导细胞发生细胞凋亡。但p53诱导细胞凋亡的机制多年来一直不太清楚．而最近发现的ASPP(apoptosisstimulatingproteinofp53)蛋白家族对p53诱导细胞凋亡的机制的研究有了新的进展。本文就此作一综述。

简介：p53是一种肿瘤抑制基因,它的突变与50%的人类肿瘤发生有关.p73基因编码的蛋白质,无论在结构上,还是在功能及调节上均与p53蛋白相似,且与肿瘤的发生密切相关,本文对此方面的研究结果进行了比较,并对p73能否作为候选抑癌基因进行了讨论.

简介：TherearetwopossibleoutcomeswhenDNAdamageoccursinnormalmammaliancells:eitherinductionofcell-cyclecheckpointwhichinhibitstheprogressofthecellcyclesaswellasactivatesDNArepairpathways,oractivationofapoptosistoeliminatedamagedcells.Thep53tumour-suppressorgeneplaysakeyroleinselectingthesepathways.Inourpresentworks,thehumangastriccancercelllineAGSwastreatedwithtripchlorolide,apotentantitumorcompoundpurifiedfromaChineseherbTripterygiumWilfordiiHook.Singlecellgelelectrophoresis(Cometassay)showedthatthetreatmentoftripchlorolideresultedinDNAdamageinAGScells.ThedamagedAGScellswentthroughapoptosis,whichwastime-anddose-dependent.

简介：Recentstudiesindicatethatcell-cyclecheckpointsaretightlycorrelatedwiththeregulationofapoptosis,inwhichp53playsanimportantrole.OurpresentworksshowthattheexpressionofE6/E7oncogenesofhumanpapillomavirusinHeLacellsisinhibitedinthepresenceofanti-tumorreagenttripchlorolide(TC),whichresultsintheup-regulationofp53inHeLacells.Interestingly,underthesameTC-treatment,thecellsattheearlyS-phasearemoresusceptibletoapoptosisthanthoseatthemiddleS-phasealthoughp53proteinisstabilizedtothesamelevelinbothsituations.Significantdifferenceisexhibitedbetweenthetwospecifiedexpressionprofiles.Furtheranalysisdemonstratesthatanti-apoptoticgenesurvivinisup-regulatedbyp53intheTC-treatedmiddle-Scells,whereasitisdown-regulatedbyp53intheTC-treatedearly-Scells.Takentogether,thepresentstudyindicatesthatthedifferentialp53-regulatedexpressionofsurvivinatdifferentstagesofthecellcycleresultsindifferentcellularoutputsunderthesameapoptosis-inducer.

简介：Toevaluatetheeffectofadenovirus-mediatedp53gene(Adp53)onapoptosisandradiosensitivityofhumangastriccarcinomacelllines.Methods:Recombinantadenovirusexpressingwild-typep53lineswithdifferentp53geneticstatus.p53proteinexpressionwasdetectedbyimmunohistochemistryassayandwesternblotassay.Cellsurvivalwasassessedusingaclonogenicassay.TUNELassaywasusedindeterminationofapoptosis.FourhumangastriccarcinomacellsinfectedwithAdp53wereirradiatedwith4GyandcellcycledistributionandSub-G1peakwereassayedbyflowcytometry.Results:G2/Marrest,apoptosisandinhibitionoftumorcellproliferationwereinducedbyinfectionatAdp53at100MOIwhichcausedhightransferrateofwild-typep53andstrongexpressionofp53proteininfourhumangastriccarcinomacells.Theradio-enhancementratioofAdp53at4Gywere3.0forWcell,3.6forMcell,2.2forneocelland2.5for823cellinvitro.Conclusion:ThisstudydemonstratedthatAdp53transferincreasedcellularapoptosisandradiosensitivityofhumangastriccarcinomacelllinesinvitroindependentlyoncellularintrinsicp53statusthussupportingthecombinationofp53genetherapywithradiotherapyinclinicaltrials.

简介：Abstract:Thisstudyinvestigatedtherelationshipbetweenhumanpapillomavirus(HPV)genotypeandexpressionofp53andp21^WAH1.Expressionofp53andp21^WAH1in35casesofcondylomaacuminatumspecimensinfectedbyHPV6/llandHPV16/18werestudiedusingimmunohistochemicalstaining.Allspecimensofthecondylomaacuminatumcasewerepositiveforexpressionofp53andp21^WAH1.Theexpressionofp53incondylomaacuminatuminfectedbyHPV16/18wassignificantlylowerthanthatinspecimensinfectedbyHPV6/ll.However,expressionofp21wAHbetweenthetwogroupswasnotsignificantlydifferent.Expressionofp53incondylomaacuminatumislikelyrelatedtoHPVgenotype,expressionofp21^WAH1wasnotrelatedtoHPVgenotype.

简介：目的探讨p27^kipl、p53蛋白在胃癌中的表达关系和预后意义。方法用免疫组化法同步检测20例胃良性病变标本及80例胃癌组织中pZ7、p53的表达。结果80例胃癌中p27蛋白阳性率为41，25％(33／80)，低于胃良性病变标本100％(20／20)，p53阳性率在胃癌中为43．75％(35／80)，而在胃良性病变标本中为0。胃癌p27阳性组的p53阳性率为66．67％，显著高于p27阴性组(P<0．05)，p27与p53呈正相关，p27与预后弱相关，p53与预后密切相关。结论p27、p53相互作用，对胃癌发生发展起重要作用；p27表达愈强，p53表达愈弱，说明预后较好，反之则差，联合检测pZ7、p53可辅助胃癌诊断，估计预后，选择治疗方案。

简介：Objective:Toinvestigatethepost-transcriptionalregulationofp21WAF1/CIP1byp53.Methods:TheMDA-MB-468cellshaveendogenousmutantp53andtheMCF7cellslineshavewtp53.Recombinantp53expressionandp21WAF1/CIP1inductionweredetectedbyWesternblotanalysis.Northernblotanalysiswascarriedouttoexaminewhetherchangesinp21WAF1/CIP1proteinlevelsinMCF7cellstreatedwithAdCMVp53arereflectedatthemRNAlevel.FlowcytometricanalysisofMCF7cellsfollowingoverexpressionofrecombination.Results:Theratioofp53:p21WAF1/CIP1wasbelow1attheearlystagesofAdCMVp53infection,butincreasedto1.6byday3andto9.7byday5post-infection.Asexpected,p21WAF1/CIP1expressionwasnotdetectableinMDA-MB-468cellsdespitethepresenceofhighlevelsofmutantp53protein.TheG1/SratiosinuntreatedcontrolsandAdCMVβgalinfectedMCF7cellswere1.10and1.35,respectively.ByNorthernblotanalyzingthep21WAF1/CIP1:GAPDHratiosatdifferenttimepointsagainsttheratioattimepoint0,amaximum3-foldinductionofp21WAF1/CIP1mRNAexpressionrelativetountreatedcontrolwasobservedonday1post-infection.TheflowcytometricanalysisindicatedthatMCF7cellsinfectedwithAdCMVp53undergoG1arrestatbothtimepointsstudied,withG1/Sratiosrangingfrom5.54atday1to5.65atday7.TheG1/SratiosinuntreatedcontrolsandAdCMVβgalinfectedMCF7cellswere1.10and1.35,respectively.Conclusion:Thisstudydemonstratedthatp53couldregulatep21WAF1/CIP1geneexpressionatboththetranscriptionalandpost-transcriptionallevelsinMCF7cells.Thelattermechanismmaybeinvolvedinorberesponsiblefor,theinductionofcellcyclearrestbytranscription-defectivemutantsofp53.

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简介：目的:探讨肺鳞癌p53免疫组化图像定量分析中描述图像色彩的指标在不同分化程度、不同临床分期及老年与非老年间的区别.方法:采用S-P法进行肺癌p53免疫组化染色,应用计算机病理图像分析系统(MPIAS-500)进行图像分析.结果:20例中没有高分化者,中分化组和低分化组p53阳性各6例.p53染色的饱和度中分化组(4.95%)低于低分化组(10.95%),差异有非常显著性(t=4.208,P=0.002),说明低分化组阳性较强.临床分期没有Ⅰ期者,Ⅱ期与Ⅲ期p53阳性分别为5例和7例,分期之间未显示出显著性差异.老年与非老年p53阳性各6例,两组之间红、绿、蓝色值及灰度均以老年组较高(183.62、177.52、164.02、175.05),而非老年组较低(166.48、157.18、139.82、154.48),差异具有非常显著性(t=3.668,P=0.004;t'=5.570,P=0.001;t=4.305,P=0.002;t'=5.586,P=0.001),表明非老年组肺鳞癌细胞阳性强度高于老年组.结论:p53在肺癌的发生发展中具有重要作用;描述图像色彩的指标用于肺癌免疫组化图像定量分析可以弥补其他指标的不足.

简介：Theexpressionofp53Protein,c-erbB-2oncoprotein,Proliferatingcennuclearantigen(usA)werestudiedbythestreptavidinperotidaseconjugated(S-P)immunohistochemicalmethodandDNAcontentinsituwastested,inordertoexplorethesignificanceofP53,c-erbB-2,PCNAinPrimallUng...

简介：摘要本文通过检测食管癌组织中p53基因甲基化状态和p53蛋白表达情况，得出结论p53基因高甲基化状态引起的突变或失活是食管癌发生发展的重要因素之一。

简介：进一步阐明p53外显子突变率与结．直肠癌不同部位之间的关系。方法：选取108例大肠癌患者癌灶组织，用PCR-SSCP法进行p53第5～8外显子的检测。结果：108,例大肠癌标本中，53例发生p53基因突变，突变率为49．07％(53／108)，统计学处理结果表明，外显子与大肠癌部位有显著关系(X^2=73．683，P

简介：目的：探讨Ｄｉｘｏｎ手术直肠下端切缘ｐ５３基因突变情况及其与肿瘤预后的关系。方法：分析１９９０年以来Ｄｉｘｏｎ直肠癌根治手术病人后三年以内死亡和生存五年以上两组病的临床情况，采用免疫组化的方法，检测两组不同生存期病人的直肠癌下段切缘ｐ５３基因突变率，结果：两病例在肿瘤们于直肠的位置和病理的淋志移率有显著差异，在两组直肠下端病理均未见癌的情况下，三年组ｐ５３突变检测分析３／１９阳性，而五年组为２／２４阳性，无显著性差异。结论：病理检查肿瘤切缘为正常细胞的部位，确实存在分子水平的、肿瘤相关异常基因细胞，表现为散在性点状，巢状分布，这应非一种孤立的、偶然的表现。

简介：目的：为了解P53蛋白异常表达与非小细胞肺癌(NSCLC)预后的关系。方法：采用S-P免疫组织化学法．检测90例手术切除的NSCLC组织石蜡包埋标本。结果：53．3%(48／90)的标本显示P53蛋白向染色阳性．肺鳞癌和腺癌的阴性率分别为64.3％(36／56)和35%(12／34)。统计学分析显示P53蛋白染色结果与病人年龄、性别及肿瘤分期无显著关系，但与肿瘤组织类型显著相关。P53蛋白染色阳性和阴性组病人中位生存月数分别是24个月和55个月。Kaplan-Meir图显示二组病人术后生存概率有明显差异。逐步回归多因素分析显示P53蛋白染色阳性与病人术后生存时间呈显著负相关。结论：P53蛋白异常表达是非小细胞肺癌预后不良的独立判断指标。

简介：ObjectiveToinviestigatetheexpressionofgallbladdercanceranditsrelationshipwitheaneeration.MethodsImmunohistoehemistrytechniquesareusedtodetecttheexpressionofp53proteinin36easesofgallbladdercancerand23adenoma.Resultsp53proteinwerefoundedpositivein19cases(52.78%)ofgallbloddercancer,in5cases(21.74%)ofadenoma.ConclusionThereiscloserelationshipbetweentheoverexpressionandthecancemtionofgallbladder,p53genemutationandoverexpressionareintheearlystageofgallbladdercancer,andplayanimportantroleinthecancemtionofadenoma.

简介：目的探讨膀胱肿瘤中免疫逃避作用引起的细胞凋亡与P53的关系.方法采用免疫组织化学方法检测33例移行细胞癌,8例膀胱腺癌及11例膀胱炎组织石蜡切片中Fas-L与P53的表达.结果P53及Fas-L在膀胱炎及肿瘤中的表达具有显著性差异(P＜0.05),在膀胱腺癌与移行细胞癌中P53、Fas-L的表达无显著性差异(P＞0.05).G1、G2、G3级中P53表达具有显著性差异(P＜0.05),Fas-L的表达无显著性差异(P=0.07).在膀胱肿瘤中,20例P53阳性患者中14例Fas-L阳性(70%),P53与Fas-L表达无显著性差异(p=0.238)及相关性(p=0.393).结论P53可能通过免疫逃避作用使肿瘤细胞凋亡下降,但不是唯一因素.

简介：目的：探讨Fas与p53蛋白在子宫内膜样腺癌发生、发展中的作用。方法：通过免疫组化S-P法检测49例子宫内膜样腺癌石腊标本的Fas和p53蛋白表达。结果：子宫内膜样腺癌组和对照组Fas表达率分别为22．4％和60．0％(P<0．01)，p53蛋白在对照组无表达，在子宫内膜样腺癌组13例(26．5％)表达阳性，p53阳性率及表达强度与细胞分化不良相关。结论：子宫内膜样腺癌Fas表达减少可能导致死亡受体介导的细胞凋亡过程受抑制，p53过度表达提示肿瘤细胞的恶性程度高和预后不良。

简介：目的：探讨不同类型胃癌P53基因表达情况，协助进一步判断肿瘤的恶性程度。方法：用免疫组化ABC法，对不同类型胃癌进行对比检查。结果：胃肝样腺癌P53基因表达明显高于其它类型胃癌。结论：检查胃癌，尤其是胃肝样腺癌P53基因表达，给临床的治疗及判断病人预后提供了重要指标。