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: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:摘要目的探讨不同克隆号p53抗体在胃腺癌中的表达及意义,与TP53基因突变情况进行一致性分析,筛选最优克隆号及其阳性阈值。方法收集河南省人民医院病理科2015年6月至2016年12月间42例胃腺癌组织,采用免疫组织化学EnVision二步法分别检测4种不同克隆号(DO-7、BP-53-12、MX008、SP5)p53蛋白水平表达情况,并采用二代测序技术检测TP53基因突变情况。统计分析不同梯度蛋白表达情况,比较各克隆号p53抗体的灵敏度、特异度和准确性。结果4种克隆号(DO-7、BP-53-12、MX008和SP5)p53免疫组织化学染色阳性腺癌细胞百分比各不相同,阳性例数亦不相同,分别为39/42(92.9%)、40/42(95.2%)、36/42(85.7%)和37/42(88.1%)。二代测序TP53基因突变33例,无突变9例。克隆号DO-7在阳性阈值为50%时准确率最高,BP-53-12、MX008和SP5准确率最高的阳性阈值分别为70%、60%和20%。相对应的4种克隆号灵敏度为:DO-7 100.0%、BP-53-12 95.7%、MX008 95.7%及SP5 100.0%;特异度为:DO-7 77.8%、BP-53-12 88.9%、MX008 100.0%及SP5 100.0%。结论不同克隆号p53在胃腺癌蛋白水平表达情况不同,最佳阳性阈值差异较大,评估其免疫组织化学染色结果必须明确所用抗体的克隆号。本研究结果表明,胃腺癌中p53克隆号SP5蛋白水平免疫标记最佳阈值为20%,与TP53基因水平预测的准确率、灵敏度、特异度均达到100.0%,因此,胃腺癌中p53采用克隆号SP5免疫组织化学探讨TP53基因突变背后的机制及创新治疗方式更具有代表性意义和价值。
简介:目的通过对肺癌患者血清及胸水p53抗体水平的检测,探讨p53抗体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26例肺癌未治疗患者,19例经手术或化疗治疗后的肺癌患者血清p53抗体,并以20例良性疾病患者作对照,其中5例肺癌患者同时检测胸水p53抗体,以6例良性胸水作对照。结果肺癌未治疗组血清阳性率为50.0%,p53抗体水平为(4.054±6.308)IU/mL,高于对照组(0.177±0.085)IU/mL,差异有统计学意义(P〈0.01),肺癌治疗组阳性率为31.6%,血清p53抗体水平为(1.660±3.591)IU/mL,与对照组和肺癌未治疗组差异无统计学意义(P〉0.05),良性对照组胸水p53抗体水平为(0.398±0.443)IU/mL,结果略高于血清,差异无统计学意义(P〉0.05);肺癌组血清p53抗体检测阳性率为60.0%,胸水阳性率为80.0%,肺癌组胸水p53抗体水平为(15.510±8.813)IU/mL,高于其血清中含量和良性对照组胸水中含量,且差异有统计学意义(P〈0.01)。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,是一种简便、特异性强的p53基因突变检测方法。血清p53抗体可成为肺癌的血清标志物,p53抗体的产生可能是肺癌发生的早期指征,是肺癌的不良预后因子,有望应用于预测复发和评价疗效。胸水p53抗体检测比血清更具敏感性。
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:Abstract:Thisstudyinvestigatedtherelationshipbetweenhumanpapillomavirus(HPV)genotypeandexpressionofp53andp21^WAH1.Expressionofp53andp21^WAH1in35casesofcondylomaacuminatumspecimensinfectedbyHPV6/llandHPV16/18werestudiedusingimmunohistochemicalstaining.Allspecimensofthecondylomaacuminatumcasewerepositiveforexpressionofp53andp21^WAH1.Theexpressionofp53incondylomaacuminatuminfectedbyHPV16/18wassignificantlylowerthanthatinspecimensinfectedbyHPV6/ll.However,expressionofp21wAHbetweenthetwogroupswasnotsignificantlydifferent.Expressionofp53incondylomaacuminatumislikelyrelatedtoHPVgenotype,expressionofp21^WAH1wasnotrelatedtoHPVgenotype.