简介:目的:进一步了解乙肝产妇的母乳中HBVDNA含量及其传染性,更好地指导母乳喂养。方法:利用荧光定时定量PCR检测技术,对45例乙肝血清学阳性的产妇进行血浆及乳汁中HBVDNA的定量检测。结果:45例产妇血浆和乳汁中HBVDNA的检出率分别为73%(33、45)和67%(30、45),其HBVDNA含量的对数值具有良好的相关性,(r=0.837,n=45,P<0.01),HBeAg(+)与HBeAb(+)两组间比较血浆及乳汁HBVDNA的含量,两者存在显著性差异(P<0.01)。HBeAg(+)组含量高于HBeAb(+)组。结论:乳汁和血浆中HBVDNA含量具有较好的相关性,血浆中HBVDNA高拷贝的产妇最好不要进行母乳喂养。产妇血浆中HBeAg与乳汁及血浆中HBVDNA含量都具有明显关系,它的存在提示血浆及乳汁中的HBVDNA含量较高。
简介:Arraycomparativegenomichybridization(CGH)hasbeenpopularlyusedforanalyzingDNAcopynumbervariationsindiseaseslikecancer.Inthisstudy,weinvestigated82sporadicsamplesfrom49breastcancerpatientsusing1-MbresolutionbacterialartificialchromosomeCGHarrays.Anumberofhighlyfrequentgenomicaberrationswerediscovered,whichmayactas'drivers'oftumorprogression.Meanwhile,thegenomicprofilesoffour'normal'breasttissuesamplestakenatleast2cmawayfromtheprimarytumorsiteswerealsofoundtohavesomegenomicaberrationsthatrecurredwithhighfrequencyintheprimarytumors,whichmayhaveimportantimplicationsforclinicaltherapy.Additionally,weperformedclasscomparisonandclasspredictionforvariousclinicopathologicalparameters,andalistofcharacteristicgenomicaberrationsassociatedwithdifferentclinicopathologicalphenotypeswascompiled.Ourstudyprovidescluesforfurtherinvestigationsoftheunderlyingmechanismsofbreastcarcinogenesis.
简介:AIM:NitrativeandoxidativeDNAdamagesuchas8-nitroguanineand8-oxo-7,8-dihydro-2'-deoxyguanosine(8-oxodG)formationhasbeenimplicatedininitiationand/orpromotionofinflammation-mediatedcarcinogenesis.TheaimofthisstudyistoclarifywhethertheseDNAlesionsparticipateintheprogressionofintrahepaticcholangiocarcinoma.METHODS:Weinvestigatedtherelationoftheformationof8-nitroguanineand8-oxodGandtheexpressionofhypoxia-induciblefactor-1α(HIF-1α)withtumorinvasionin37patientswithintra-hepaticcholangiocarcinoma.RESULTS:Immunohistochemicalanalysesrevealedthat8-nitroguanineand8-oxodGformationoccurredtoamuchgreaterextentincanceroustissuesthaninnon-canceroustissues.HIF-1αcouldbedetectedincanceroustissuesinallpatients,suggestinglowoxygentensioninthetumors.HIF-1αexpressionwascorrelatedwithinduciblenitricoxidesynthase(iNOS)expression(r=0.369andP=0.025)and8-oxodGformation(r=0.398andP=0.015).DoubleimmunofluorescencestudyrevealedthatiNOSandHIF-1αco-localizedincanceroustissues.Notably,theformationof8-oxodGwascorrelatedsignificantlywithlymphaticinvasion(r=0.386andP=0.018).Moreover,8-nitroguanineand8-oxodGinnon-canceroustissueswereassociatedsignificantlywithneuralinvasion(P=0.042andP=0.026,respectively).TheseresultssuggestthatreciprocalactivationbetweenHIF-1αandiNOSmediatespersistentDNAdamage,whichinducestumorinvasivenessviamutations,resultinginpoorprognosis.CONCLUSION:Theformationof8-nitroguanineand8-oxodGplaysanimportantroleinmultiplestepsofgeneticchangesleadingtotumorprogression,includinginvasiveness.
简介:Asimplemethodtocreateachromosome-specificDNAlibrqaryofrice,includingmicrodissection,amplification,charterizationandcloning,isdescribed.Ricechromosome4fromametaphasecellhasbeenisolatedandamplifiedbytheLinkerAdapterPCR(LA-PCR).ThePCRproductswerelabeledasprobeswithDIG-11-dUTPusingtherandomprimingmethod.SouthernblotanalysiswithricegenomicDNAandspecificRFLPmarkersdemonstratedthatthePCRproductswerederivedfromricechromosome4.Alargelibrarycomprisingover100,000recombinantplasmidmicroclonesfromricechromosome4wasconstructed.Colonyhybridizationshowedthat58%oftheclonescontainedsingleorlow-copysequencesand42%containedrepetitivesequences.ThesizeofinsertsgeneratedbyPCRrangedfrom140bpto500bp.ThismethodwillfacilitatecloningofthespecificchromosomeDNAmarkersandimportantgenesofrice.
简介:摘要:本文作者就DNA的半保留复制实验思路提出了改进设想,可以有效化解学习难度,培养学生的批判性思维。
简介:摘要目的探讨血清学HBsAg阳性产妇乳汁中HBV-DNA检出率,以指导母乳喂养。方法运用3种不同处理方法处理754例HBsAg阳性产妇乳汁,再用荧光定量PCR法检测其HBV-DNA含量。结果754例HBsAg阳性产妇乳汁中HBV-DNA检出率方法1为44.4%(335/754)方法2为33.3%(251/754),方法3为51.9%(391/754)(P<0.01);病毒载量的对数值分别为3.87±0.79;3.65±0.68;4.35±0.84(P<0.05)。结论运用方法3处理乳汁标本HBV-DNA检出率及病毒含量均高于其它两种方法,运用方法3筛查出的阴性结果更可靠,乳汁HBV-DNA阴性的哺乳期妇女可以进行母乳喂养。
简介:Rat-1cellsweretransfectedwithDNAfromhumanesophagealcancer2K,4K,6K,7K.8K.Thetransformingfociwereobtainedandthetransformingcelllineswereestablished.Thecelllinescanformlargercolonyinsoftagar.Thosenudemiceinjectedsubcutaneouslywiththecellssufferedfromlargerfibroussarcoma.Thisindicatesthatthecelllineshavecarcinogenicity.TheexperimentalresultssuggestthathumanDNAsequenceandhumanHa-rasspecial616Kb(BamHI)bandarepresentintheDNAofthetransformingcells.Theover-expressionofrasgeneproductsP21werefoundinthetissuesofexophagealcancer,thetissuesadjacenttotumorandthetransformingcells.
简介:预防与控制乙型肝炎发病的乙型肝炎病毒(HBV)疫苗,是有重大的社会和经济意义。HBV的持续感染可引起慢性肝脏疾患,并逐步发展为肝硬化和肝细胞癌(HCC)。目前的乙肝重组亚单位疫苗可以使90%的接种者产生保护性抗体;但是对慢性HBV携带者,由于其机体对HBsAg蛋白产生耐受,不能产生体液和细胞免疫,因此它只能作为一种预防性的疫苗。DNA疫苗(基因疫苗)是一种新的疫苗技术,通过向体内递送编码抗原的细菌质粒,刺激产生特异的体液和细胞免疫反应。在小鼠和其他的肝炎病毒感染动物模型中,HBVDNA疫苗可以特异性地引起体液和细胞免疫,清除HBV转基因动物血循环中的HBsAg颗粒和HBVDNA。如果加入各种免疫调节细胞因子的基因,可以进一步提高HBVDNA疫苗的免疫效果,因此它不仅可作为预防性疫苗,也可作为治疗型疫苗。