简介:摘要目的分析DNA倍体和P53与乳腺浸润性导管癌临床病理学因素(患者年龄、肿瘤大小、临床病理分期、组织学分级、分子分型、淋巴结转移情况、有无癌栓)的相关性,并探讨P53与DNA倍体的相关性,从而为乳腺癌的诊断和治疗提供依据。方法收集XX医院2015年9月至2016年4月间乳腺肿瘤患者112例,采用细胞DNA自动检测分析仪测定细胞核DNA含量,采用免疫组化的方法检测P53,分析DNA倍体和P53与乳腺浸润性导管癌临床病理学因素的相关性以及DNA倍体与P53的关系。结果良性肿瘤、导管内癌、浸润性导管癌三组的DNA异倍体率进行比较,差异具有统计学意义(χ2=48.823,P<0.001)。P53蛋白阳性表达与肿瘤组织分级有关(χ2=28.439,P<0.001)。P53蛋白阳性表达细胞中DNA含量高于P53蛋白阴性表达细胞(t=2.18,P=0.033)采用spearman’s秩相关进一步分析P53蛋白表达与DNA含量的相关性,结果表明P53蛋白(r=0.753,P<0.01)表达与DNA含量呈正相关。结论恶性肿瘤中DNA倍体率明显高于良性肿瘤,提示细胞DNA定量对肿瘤良恶性鉴别有重要价值。DNA含量与组织分级和分子分型有关,组织分级越高,DNA含量越高,提示肿瘤的恶性度越高。P53阳性表达与组织分级、分子分型及淋巴结转移有关;DNA含量越高和P53阳性表达与乳腺癌患者的年龄,肿瘤大小、临床病理分期和有无癌栓无关。
简介:Colorectalcarcinoma(CRC)isacommoncauseofmorbidityandmortalityworldwide.TwopathogenicpathwaysareinvolvedinthedevelopmentofadenomatoCRC.ThefirstpathwayinvolvesAPC/β-catenincharacterizedbychromosomalinstabilityresultingintheaccumulationofmutations.ThesecondpathwayischaracterizedbylesionsinDNAmismatchrepairgenes.AberrantDNAmethylationinselectedgenepromotershasemergedasanewepigeneticpathwayinCRCdevelopment.CRCscreeningisthemostefficientstrategytoreducedeath.SpecificDNAmethylationeventsoccurinmultistepcarcinogenesis.EpigeneticgenesilencingisacausativefactorofCRCdevelopment.DNAmethylationshavebeenextensivelyexaminedinstoolfromCRCandprecursorlesions.ManymethylatedgeneshavebeendescribedinCRCandadenoma,althoughnodefiniteDNAmethylationbiomarkerspanelhasbeenestablished.MultipleDNAmethylationbiomarkers,includingsecretedfrizzled-relatedprotein2,secretedfrizzled-relatedprotein1,tissuefactorpathwayinhibitor2,vimentin,andmethylguanineDNAmethyltransferase,havebeenfurtherinvestigated,andobservationshaverevealedthatDNAmethylationbiomarkersexhibitwithhighsensitivityandspecificity.ThesemarkersmayalsobeusedtodiagnoseCRCandadenomainearlystages.Realtimepolymerasechainreaction(qPCR)issensitive,scalable,specific,reliable,timesaving,andcosteffective.Stoolexfoliatedmarkersprovideadvantages,includingsensitivityandspecificity.AstoolqPCRmethylationtestmayalsobeanenhancedtoolforCRCandadenomascreening.
简介:Aminoglycosides(AmAn)arewidelyusedfortheirgreatefficiencyagainstgram-negativebacterialinfections.However,theycanalsoinduceototoxichearingloss,whichhasaffectedmillionsofpeoplearoundtheworld.Aspreviouslyreported,individualsbearingmitochondrialDNAmutationsinthe12SrRNAgene,suchasm.1555A>Gandm.1494C>T,aremorepronetoAmAn-inducedototoxicity.Thesemutationscausehumanmitochondrialribosomestomorecloselyresemblebacterialribosomesandenableastrongeraminoglycosideinteraction.Consequently,exposuretoAmAncaninduceorworsenhearinglossintheseindividuals.Furthermore,awiderangeofseverityandpenetranceofhearinglosswasobservedamongfamiliescarryingthesemutations.StudieshaverevealedthatthesemitochondriamutationsaretheprimarymolecularmechanismofgeneticsusceptibilitytoAmAnototoxicity,thoughnuclearmodifiergenesandmitochondrialhaplotypesareknowntomodulatethephenotypicmanifestation.
简介:导出病毒的nucleic酸的细胞的察觉到为对病毒感染的早防卫是必要的。在最近的年里,包括周期的GMP安培synthase(cGAS)和gamma-interferon-inducible蛋白质(IFI16),察觉到蛋白质的DNA的发现导致了房间怎么对带DNA染色体的到来的病原体唤起强壮的天生的有免疫力的回答的理解。发信号由DNA传感器刺激了取决于适配器蛋白质圈套(干扰素基因的激发器),到启用抗病毒的蛋白质的表示,包括类型我干扰素。便于有效感染,病毒发展了大量避免策略,指向的主人DNA传感器,适配器蛋白质和抄写因素。在这评论,STING小径的导致病毒的激活上的当前的文学被介绍,我们讨论在这条抗病毒的小径指向不同的步的最近识别的病毒的避免机制。
简介:全新CinturatoP6是一款倍耐力专为亚太地区替换市场设计生产的绿色轮胎产品,针对中型与紧凑型轿车,完美平衡了安全性、舒适性和节能性,给乘驾者带来更为精妙的道路体验.