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1、2的表达及AP-1、NFKB信号通路中国医学科学院ACIlAACADEMIAEMEDICINAESINICAE致密斑细胞COX-2的表达及AP-1,NFKB信号通路刘冬妍,李学旺,李航,李雪梅,叶文玲中国医学科学院中国协和医科大学北京协和医院肾内科,北京100730通信作者:李学旺电子邮件:leexuewang@hotmail.corn?论着?摘要:目的评估低盐(LS)培养对小鼠致密斑(MMDDI)细胞环氧化酶一2(cOx-2)表达及核因子-KB(NF.KB)和活化蛋白.1(AP_1)活性的影响.方法经脂质体转染含NF-KB或AP-I的报告
2、质粒,采用瞬时表达方法检测正常盐(NS)与LS培养对NF.KB和AP-l转录活性的影响.采用RT-PCR检测MMDDI细胞C0x-2表达的变化,Westernblot方法检测细胞内p.p38MAPK,p-p44/42,c-Jun,c.Fos和C0x-2蛋白的表达.结果LS培养促进了MMDDI细胞c0x-2mRNA和蛋白表达(P<0.01).LS培养后,p38和p44/42的磷酸化程度显着上调(P<0.01),180rain后达到高峰.p38抑制剂SB-203580,p44/42抑制剂PD-98059可降低LS诱导的C0x-2表达
3、(P<0.01).LS培养促进了c.Jan,c.Fos蛋白表达(P<0.叭),激活了AP?l和NF-KB的转录活性(P<0.叭).25~moVLNF-KB抑制剂PDTC和20p,mol/LAP.1抑制剂curcumin下调了LS诱导的NF-KB,AP-I活性(P<0.叭).25p,mol/LPDTC,20p,mol/Lcurcumin降低了LS诱导的c0x-2mRNA和蛋白表达(P<0.01).结论LS培养可促进MMDDI细胞c0x-2的表达,其作用可能与促进p38MAPK,p44/42激酶的磷酸化,增加NF.
4、KB和AP_l的活性有关.关键词:环氧化酶一2;核因子-KB;活化蛋白.1;质粒;丝裂素激活蛋白激酶中围分类号:R334.1文献标识码:A文章编号:1000-503X(2007)01-0078-05ExpressionofCyciooxygenase~inaMouseMaculaDensaCellLinesandSignalTransductionofNF?-KBandAP?-1LIUDong—yan,LIXue—wang,LIHang,LIXue—mei,YEWeng—lingDepartmentofNephrology,PUMCHosp
5、ital,CAMSandPUMC,Beijing100730,ChinaCorrespondingauthor:UXue—wangE—mail:leexuewang@hotmail.cornABSTRACT:ObjectiveToelvaluatetheeffectoflowsalt(LS)ontheexpressionofcyclooxygenase-2(COX-2)andtheactivityofnuclearfactorkappaB(NF—Ks)andactivatorprotein一1(AP一1)inthemousemaculade
6、nsaderived(MMDDI)cellline.MethodsMMDDIcellsweretransfectedwithluciferasereporterplasmidcontainingAP一1orNF—KB.Luciferasereporterassaywasusedtoevalu~etheeffectofnormalsalt(NS)andlOWsalt(LS)ontheactivitiesofNF.KBandAP.1.ThechangesofCOX-2expressionwereexam.inedbyRT—PCR.Theexpr
7、essionofp-p38MAPK,p-p44/42,c—Jun,c—Fos,andCOX-2inMMDDIcellswereanalyzedbyWesternblot.ResultsTheexpressionsofCOX一2mRNAandproteininMMDD1cellsweresignificantlyincreasedbyLS(P<0.O1).Phosphorylatedp38andp44/42MAPkinaseweresignificantlyin—creasedbytreatmentat180min(P<0.01)
8、.Theup—regulatedCOX-2proteinexpressionwithLSweresignifi—cantlyreducedwithSB203580(p38inhi