简介:OBJECTIVE:ToevaluatetheassociationofX-raycross-complementinggroup1(XRCC1)Arg399Gln,Arg194TrpandArg280Hispolymorphismswiththeriskofglioma.DATASOURCES:AsystematicliteraturesearchofpaperspublishedfromJanuary2000toAugust2012inPubMed,Embase,ChinaNationalKnowledgeInfrastructuredatabase,andWanfangdatabasewasperformed.Thekeywordsusedwere"glioma","polymorphism",and"XRCC1orX-rayrepaircross-complementinggroup1".Referencescitedintheretrievedarticleswerescreenedmanuallytoidentifyadditionaleligiblestudies.STUDYSELECTION:Studieswereidentifiedaccordingtothefollowinginclusioncriteria:case-controldesignwasbasedonunrelatedindividuals;andgenotypefrequencywasavailabletoestimateanoddsratio(OR)and95%confidenceinterval(CI).Meta-analysiswasperformedfortheselectedstudiesafterstrictscreening.Dominantandrecessivegeneticmodelswereusedandtherelationshipbetweenhomozygousmutantgenotypefrequenciesandmutantgenefrequencyandgliomaincidencewasinvestigated.WechosethefixedorrandomeffectmodelaccordingtotheheterogeneitytocalculateORand95%CI,andsensitivityanalyseswereconducted.PublicationbiaswasexaminedusingtheinvertedfunnelplotandtheEgger’stestusingStata12.0software.MAINOUTCOMEMEASURES:AssociationofXRCC1Arg399Gln,Arg194Trp,andArg280Hispolymorphismswiththeriskofglioma,andsubgroupanalyseswereperformedaccordingtodifferentethnicitiesofthesubjects.RESULTS:Twelvearticleswereincludedinthemeta-analysis.ElevenofthearticleswereconcernedwiththeArg399Glnpolymorphismandgliomaonsetrisk.Significantlyincreasedgliomariskswerefoundonlyinthedominantmodel(Gln/Gln+Gln/ArgversusArg/Arg:OR=1.26,95%CI=1.03-1.54,P=0.02).Inthesubgroupanalysisbyethnicity,significantlyincreasedriskwasfoundinAsiansubjectsintherecessive(OR=1.46,95%CI=1.04-2.45,P=0.03)anddominantmodels(OR=1.40,95%CI=1.10-1.78,P=0.007),andhomozygotecontrast(OR=1.69,95%CI=1.17-2.45,P=0.005),bu
简介:目的探讨不同病理级别人脑神经胶质瘤组织中p57^kip2/p21^cip1mRNA的表达变化及其关系。方法采用实时荧光定量PCR检测p57^kip2/p21^cip1mRNA在68例脑胶质瘤组织和16例非肿瘤脑组织中的表达水平。结果①p57^kip2mRNA在脑胶质瘤中的表达水平显著低于非肿瘤脑组织(P〈0.01),且其表达水平与肿瘤病理级别呈显著负相关(rs=-0.495;P〈0.01)。②p21^cip1mRNA在脑胶质瘤中的表达水平与非肿瘤脑组织相比无显著差异(P〉0.05),但其表达水平与肿瘤病理级别呈显著负相关(rs=-0.615;P〈0.01)。结论p57^kip2/p21^cip1的异常表达可能与人脑胶质瘤的发生和发展有密切相关,其表达水平可反映肿瘤的恶性程度。
简介:目的:观察溶血磷脂酸(LPA)对人单核细胞株THP-1细胞核因子-κBp65(NF-κBp65)表达、核移位及炎性细胞因子肿瘤坏死因子α(TNFα)变化的影响,探讨LPA致动脉粥样硬化的机制。方法以不同浓度水平LPA(0~10μM)刺激人THP-1细胞4h,或以LPA1μM处理THP-1细胞不同时间(0~8h),Westernblot检测THP-1细胞核蛋白NF-κBp65表达变化,免疫荧光检测NF-κBp65蛋白表达核移位,酶联免疫法测定细胞上清液中细胞因子TNF-α水平。将细胞予NF-κB抑制剂咖啡酸苯乙酯(CAPE))20mg/L预处理1h后,LPA1μM处理4h后,酶联免疫法测定细胞上清液中TNFα水平。结果LPA以剂量依赖和时间依赖的方式诱导THP-1细胞NF-κBp65表达,促进NF-κBp65转位到核内,并促进TNF-α分泌,CAPE抑制NF-κB后可显著抑制TNF-α分泌。结论LPA可显著促进THP-1细胞NF-κB的表达和活化,促进炎性因子TNFα的释放,NF-κB信号途径部分介导了LPA致粥样硬化作用。