简介:死亡联系域的蛋白质Daxx施加包括调停的许多报导功能经由激活c6月N终端从FasL发信号到apoptosisapoptosis的kinase(JNK),正式就职和抑制,和染色质改变的规定。它原来从酵母被克隆用船边交货对相似物体之连续感觉而形成心像口的细胞内部的尾巴的二混血儿的屏幕诱饵。而许多起始的报告仍然保持争论,Daxx在一系列压力信号包括UVirradiation,过氧化氢治疗和TGF-β治疗触发的apoptosis的规定起重要作用,是清楚的。在这评论,我们在Axinbeing上集中连接Daxx到p53的一个拴住的因素。
简介:Cisplatindamagescochlearhaircellsandspiralganglionneuronsthroughcelldeathsignalingpathwaysthatarenotfullyunderstood.Weusedfocusedapoptosisgenemicroarraystostudyearlychangesingeneexpres-sionincochlearculturesfromP3neonatalratstreatedwithcisplatin(0.2mM).After12hoursofcisplatintreat-ment,morethan50%ofthe96genesonthearrayshowedasignificantdecreaseinexpression,consistentwithwidespreadcelldeath.However,after3hoursofcisplatintreatment,10genesshowedsignificantincreaseinex-pressionintotalcochleartissue.Inexperimentswithsubsetsofcochleartissues,at3h,cisplatininducedincreasedexpressionof12genesinthecochlearsensoryepithelium(basilarmembrane)and11genesinthespiralganglion(tissueofRosenthal'scanal,containingthespiralganglion).Theseincludedpro-andanti-apoptoticgenesin-volvedinthep53signalingpathway,TNFreceptorfamily,NF-kappaBpathway,deathdomainfamily,deatheffec-tordomainfamily,Bcl-2family,CARDfamily,TRAFfamily,andGTPsignaltransduction.Althoughthechangesingeneexpressionshowedanoverlapbetweenbasilarmembraneandspiralganglion,otherchanges,whichmayreflecttheuniqueresponseofeachtissue,werealsoobserved.Pifithrin-αblockedcisplatin-inducedup-regulationofgenesinthep53signalingpathwaywhenassayedbybothsuperarrayandrealtimePCR.Thedataaddtoourunderstandingoftheinvolvementofp53incisplatin-inducedototoxicityandotoprotection,conferredbythep53inhibitorPifithrin-α.
简介:TherearetwopossibleoutcomeswhenDNAdamageoccursinnormalmammaliancells:eitherinductionofcell-cyclecheckpointwhichinhibitstheprogressofthecellcyclesaswellasactivatesDNArepairpathways,oractivationofapoptosistoeliminatedamagedcells.Thep53tumour-suppressorgeneplaysakeyroleinselectingthesepathways.Inourpresentworks,thehumangastriccancercelllineAGSwastreatedwithtripchlorolide,apotentantitumorcompoundpurifiedfromaChineseherbTripterygiumWilfordiiHook.Singlecellgelelectrophoresis(Cometassay)showedthatthetreatmentoftripchlorolideresultedinDNAdamageinAGScells.ThedamagedAGScellswentthroughapoptosis,whichwastime-anddose-dependent.
简介:摘要目的探讨血清及胸水P53抗体水平检测对肺癌诊断价值和临床意义。方法采用酶联免疫吸附法(ELISA)检测36例肺癌患者、29例经手术或化疗治疗后的肺癌患者血清P53抗体,并以30例健康体检者作对照,其中15例肺癌患者同时检测胸水P53抗体,以16例良性胸水作为对照。结果肺癌组血清P53抗体水平为3.879±5.963IU/ml,明显高于对照组0.144±0.019IU/ml,且差异有高度显著性(P<0.01),阳性率为52.8%;在肺癌治疗组,血清P53抗体水平为1.86±2.914IU/ml,阳性率为34.5%,而且与对照组和未治疗肺癌组差异无显著性(P>0.05);肺癌胸水P53抗体水平18.95±7.319IU/ml高于良性胸水对照组0.267±0.318IU/ml,且具有高度显著性差异(P<0.01),阳性率86.7%。结论检测血清及胸水P53抗体水平有助于肺部良恶性疾病的诊断及鉴别诊断,血清P53抗体可成为肺癌的血清标志物,胸水P53抗体检测比血清更具敏感性。
简介:摘要p53基因是一种常见的抑癌基因,它几乎参与了人类所有肿瘤的生物学过程。骨肉瘤是一种最常见的骨原发恶性肿瘤,p53基因改变是骨肉瘤发生发展过程中的一个重要事件,并影响着化疗效果和预后。现就p53基因在骨肉瘤中的研究做一综述。
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:摘要目的研究血浆纤维蛋白原(fibrinogen, FBG)水平与乳腺癌组织p53蛋白表达的关系,及二者与乳腺癌预后的关系。方法纳入2012年1月至2016年10月在海南医学院第二附属医院接受手术治疗的乳腺癌患者共177例,并收集患者的一般临床病理特征、p53蛋白表达及术前1周内血浆FBG水平等资料。采用χ2检验分析不同的血浆FBG水平与一般临床病理特征及p53蛋白的关系,并采用二分类Logistic回归进行多因素分析。采用Kaplan-Meier生存分析法及COX回归分析法分别进行无浸润疾病生存期(invasive disease-free survival,IDFS)的单因素和多因素分析。结果单因素分析结果显示,年龄>50岁及肿瘤组织p53阳性与血浆FBG>2.75 g/L呈显著正相关(P值分别为<0.001及0.006)。多因素分析结果示,肿瘤组织p53蛋白阳性(OR 2.256,95% CI 1.192~4.271,P<0.001)及年龄>50岁(OR 3.712,95% CI 1.967~7.002,P<0.001)是血浆FBG>2.75 g/L的独立相关因素。Kaplan-Meier生存分析结果显示,年龄>50岁、T>2 cm、淋巴结转移、Ⅲ期、血浆FBG>2.75 g/L、肿瘤组织p53蛋白阳性是IDFS的不良预后因素。COX回归分析结果显示血浆FBG>2.75 g/L(HR 6.226,95% CI 3.863~10.033,P<0.001)、肿瘤组织p53蛋白阳性(HR 1.864,95% CI 1.133~3.066,P=0.014)及Ⅲ期(HR 10.382,95% CI 5.942~18.141,P<0.001)是IDFS的不良预后因素,而辅助内分泌治疗(HR 0.427,95% CI 0.275~0.663,P<0.001)是IDFS的良好预后因素。结论乳腺癌p53的表达与高血浆FBG水平显著相关,且p53表达与高血浆FBG水平均与乳腺癌的不良预后相关。在传统病理预后指标的基础上,检测血浆FBG及肿瘤组织p53蛋白可能有助于增加乳腺癌患者的预后信息。
简介:Abstract:Thisstudyinvestigatedtherelationshipbetweenhumanpapillomavirus(HPV)genotypeandexpressionofp53andp21^WAH1.Expressionofp53andp21^WAH1in35casesofcondylomaacuminatumspecimensinfectedbyHPV6/llandHPV16/18werestudiedusingimmunohistochemicalstaining.Allspecimensofthecondylomaacuminatumcasewerepositiveforexpressionofp53andp21^WAH1.Theexpressionofp53incondylomaacuminatuminfectedbyHPV16/18wassignificantlylowerthanthatinspecimensinfectedbyHPV6/ll.However,expressionofp21wAHbetweenthetwogroupswasnotsignificantlydifferent.Expressionofp53incondylomaacuminatumislikelyrelatedtoHPVgenotype,expressionofp21^WAH1wasnotrelatedtoHPVgenotype.