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1、shRNA干扰VEGF表达对白血病细胞多药耐药的影响作者:方莉莉,许文林,陈琛,房新建,陈巧云,李娟【摘要】目的:探讨血管内皮细胞生长因子(VEGF)与人白血病耐药细胞株K562/A02细胞多药耐药的关系及其机制。方法:针对VEGF基因设计合成3条干扰片段shRNA1,2,3,采用脂质体2000分别将其转染入K562/A02细胞,RTPCR法检测VEGF和多药耐药相关基因MDR1,MRP1,topoⅡ,GST的mRNA水平;蛋白质印迹法检测VEGF蛋白水平;MTT法检测各组细胞对多柔比星的半数抑制浓度(IC50值)。结
2、果:K562/A02细胞VEGFmRNA表达水平显著高于敏感株K562细胞,差异有统计学意义(P<0.01),且VEGF蛋白水平也显著高于K562细胞;转染shRNA后,K562/A02细胞中VEGFmRNA水平出现不同程度下调,其中shRNA2组和shRNA3组与转染随机片段组比较差异有统计学意义(P<0.05),以shRNA3组下调最显著,并且VEGF蛋白水平也出现相应的下调;转染48h后K562/A02细胞中MDR1,MRP1及topoⅡ的mRNA水平均出现不同程度下调,以shRNA3组下调最显著,分别
3、下调(39.7±1.21)%,(29.1±0.97)%,(28.2±1.04)%,GST基因表达则无明显变化;阳性转染组细胞对多柔比星的敏感性明显增加,其中以shRNA3组最显著。结论:VEGFshRNA可以抑制K562/A02细胞VEGF基因与蛋白的表达,不同干扰片段的沉默效果不同,并增强K562/A02细胞对多柔比星的敏感性,其机制可能与MDR1,MRP1及topo14Ⅱ的表达下调有一定的关系。【关键词】血管内皮生长因子;RNA干扰;K562/A02细胞;多药耐药[Abstract]Objective:Tostudy
4、therelationshipbetweenvascularendothelialgrowthfactor(VEGF)andmultidrugresistanceofhumanleukemiacelllineK562/A02byRNAinterference,andthenthemechanismwasexplored.Methods:TheVEGFshRNAchain1,2and3weredesigned,synthesized,thentransfectedintoK562/A02cellslinebylipofec
5、tamine2000reagent.RTPCRwasusedtodetecttheexpressionofVEGFandMDRrelatinggenesMDR1,MRP1,topoⅡ,GSTinmRNAlevel;WesternblottingwasusedtoanalyzedtheexpressionofVEGFinproteinlevel;MTTwasusedtodeterminetheIC50oftransfectionalcellstodoxorubicin.Results:ComparedtoK562cel
6、l,theexpressionofVEGFinK562/A02cellwasevenmore(P<0.01),andafterVEGFshRNAsweretransfectedintoK562/A02cells,theexpressionofVEGFatthemRNAlevelweredecreased,andtherewerestatisticaldifferencebetweenVEGFshRNA2grouporVEGFshRNA3groupandHKgroup(P<0.05),thegreatestde
7、creasewasseenincellstransfectedwithVEGFshRNA3;andtheproteinlevelofVEGFwere14alsodownregulated.TheMDR1,MRP1,topoⅡmRNAofK562/A02cellweresignificantlydecreased;thegreatestdecreasewasseeninVEGFshRNA3group.TheIC50valueofpositivelytransfectedgroupwerelowerthanthatofco
8、ntrolgroups.Conclusion:AftersilenceofVEGFbyshRNA,themRNAexpressionofMDRassociatedgenessuchasMDR1,MRP1andtopoⅡinK562/A02cellsweredownregulated,andthesensitivi