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时间:2019-01-04
《tnf-α激活nf-κb信号通路影响培养成纤维细胞sdf-1分泌》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、TNF-α激活NF-κB信号通路影响培养成纤维细胞SDF-1分泌张玉龙1,毋巨龙1,杨忠2,丁可3,李世荣1(400038重庆,第三军医大学:西南医院整形科1,基础部神经生物教研室2,西南医院骨科3)[摘要]目的:探讨肿瘤坏死因子α(TNF-α)激活核因子-κB(NF-κB)信号通路对成纤维细胞生物学行为的影响。方法:小鼠胚胎成纤维细胞(MEF)进行体外培养,将细胞分为TNF-α组、TNF-α+吡咯烷二硫氨基甲酸(PDTC)组及对照组,处理后的细胞采用CCK-8方法检测细胞增殖情况、Westernblot和细胞免疫荧光检测IκBα蛋白表达与定位、ELISA
2、检测基质细胞衍生因子1α(SDF-1α)的分泌。结果:TNF-α在一定浓度范围内对成纤维细胞起到明显的促增殖作用,CCK-8检测显示TNF-α组在不同浓度和不同时相点MEF的吸光度(OD)值与TNF-α+PDTC组及对照组相比差异显著(P<0.05);免疫荧光染色显示IκBα主要分布于胞浆,TNF-α组与对照组和TNF-α+PDTC组相比,IκBα荧光强度明显减弱。Westernblot结果发现TNF-α刺激后30min,TNF-α组和TNF-α+PDTC组IκBα蛋白表达均降至最低值,随时间推移逐渐恢复,TNF-α+PDTC组IκBα蛋白表达显著高于TN
3、F-α组,结果差异显著(P<0.05)。ELISA检测发现TNF-α作用后成纤维细胞SDF-1α的分泌呈减少趋势,TNF-α+PDTC组则能显著逆转TNF-α作用,促进SDF-1α分泌;结论:TNF-α能通过激活NF-κB通路,影响小鼠胚胎成纤维细胞的增殖及分泌活动等细胞生物学行为。[关键词]肿瘤坏死因子-α;核因子-κB;小鼠胚胎成纤维细胞;吡咯烷二硫氨基甲酸[基金项目]重庆市自然科学基金项目(CSTC2009BB5146)[通讯作者]李世荣,电话(023)68754192,E-mail:zhengxing@vip.163.com毋巨龙,电话(023)6
4、8765350,E-mail:wj03310@tom.comTNF-αinfluencesthefunctionofculturedfibroblaststhroughactivatingNFkappaBsignalingpathwayZhangYulong1,WuJulong1,YangZhong2,DingKe3,LiShirong1(DepartmentofPlasticandCosmeticSurgury1,DepartmentofNeurobiology2,DepartmentofOrthopedics3,SouthwesternHospital
5、,ThirdMilitaryMedicalUniversity,Chongqing,400038,China)[Abstract]ObjectiveTostudytheeffectsoftumornecrosisfactor-α(TNF-α)onthefunctionofculturedfibroblastsanditsrelevantnuclearfactor-κBmechanism.Methods:9Mouseembryofibroblasts(MEF)wereculturedinvitroandweretreatedwithTNF-αorTNF-αp
6、lusPDTCrespectively.CellproliferationwereanalysedbyCCK-8methodandflowcytometry.ThelevelsofIκBαincytoplasmwereexaminedwithWesternblotandimmunoflourescence.ThesecretionofSDF-1αwasmeasuredthroughELISAkits.Results:TNF-αpromotestheproliferationofMEFinaconcentration-dependentmanner,ther
7、esultofCCK-8showedthattheabsorbanceinTNF-αgroupwassignificantlyhigherthanthatinTNF+PDTCgroupandcontrolgroup(P<0.05);ImmunofluorescencestainingshowedthatIκBαismainlydistributedinthecytoplasm.fluorescentintensityofIκBαintheTNF-αgroupdecreasedsignificantlywhencomparedwithcontrolandth
8、eTNF-α+PDTCgroup.Westernblotresul
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