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: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:Inordertoanalyzethesequencesoftheinternaltranscribedspacer(ITS)includingthe5.8SribosomalDNA(rDNA)ofcommondermatophytes,soastoobtainarapidandaccuratemethodtoidentifythespeciesofdermatophytesandtoestablishthephylogenetictreeofthesespeciestounderstandtheirrelationship,16strainsofdermatophyteswerecollectedandpreliminarilyidentifiedbymorphologicalcharacteristics.GeneralprimersforfungiITS1andITS4wereusedtoamplifytheITSrDNAofeachstrainswithPCR.ThePCRproductsafterpurificationweresequenceddirectlyandwereanalyzedthroughinternet.Intheresults,11strainswereidentifiedbymeansofmorphologicalfeatures,amongwhich5strainswereTrichophyton,5strainswereMicrosporumand1wasEpidermaphyton,whichwasconsistentwiththeresultsbymolecularbiology.Inthe5unidentifiablestrains,1strainwasprovedtobeChrysosporiumbymolecularbiology.Thesestrainsstudiedcouldbedividedinto3differentclassesasindicatedintheanalysisofthephylogenetictreeofthesequencesinITS,whichwerequitedifferentfromthoseofmorphologicalclassification.ItisevidentfromtheaboveobservationsthatthemolecularmethodofanalysisontheITSsequencesisarapid,highlysensitiveandaccurateapproachforthedetectionofdematophytespecies,however,itstillexhibitssomelimitationsneedingthesupplementationwithmorphologicalidentification.
简介:目的研究乙型肝炎免疫球蛋白(HBIG)对肝细胞的跨膜转运作用和对乙型肝炎病毒(HBV)感染细胞模型的乙型肝炎表面抗原(HBsAg)、HBVDNA分泌的抑制作用。方法用含HBIG的培养基培养QSG7701细胞,在不同时间点定量检测培养上清的抗HBs,计算HBIG的透过率;用含HBIG的培养基培养HepG2.2.15细胞数天,或先以,定浓度的HBIG共培养,第3天后更换为不含HBIG的培养基继续培养细胞。于不同时间点定量检测培养上清的HBsAg、HBVDNA;用MTT比色试验观察药物的细胞毒性。结果浓度为0.1~0.4IU/mL的HBIG与QSG7701细胞共孵育48h时,细胞内约有38%~46%的HBIG。浓度为0.1~10.0IU/mL的HBIG作用第3、6.9天时能抑制HepG2,2.15细胞培养上清中HBsAg、HBVDNA的分泌(P〈0.01)。住尤药物继续培养的第5、7天,培养卜清中HBsAg浓度较有药物培养的第3天低且继续下降(P〈0.01),第9~11天逐步增高;培养上清HBVDNA水平在第5天时也较有药物培养的第3天低并继续下降(P〈0.01),第7~11大时逐步增高。结论在体外细胞实验中,HBIG能跨膜转运入肝细胞内,细胞内外的HBIG能抑制HBsAg、HBVDNA的分泌。