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时间:2020-06-03
《Runx3基因对HepG2细胞顺铂耐药性的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第34卷第9期第三军医大学学报Vo1.34.No.92012年5月15日JThirdMi1MedUnivMay152012813文章编号:1000-5404(2012)09.0813—04Runx3基因对HepG2细胞顺铂耐药性的影响郭元红,陈伟庆,房殿亮(400010重庆,重庆医科大学附属第二医院消化内科)[摘要]目的探讨Runx3基因对HepG2细胞耐药性的影响及可能机制。方法取在1.6g/ml顺铂(CDDP)下生长良好的HepG2耐药细胞(HepG2/CDDP一1.6),建立耐药HepG2/CDDP的动态变化模型HepG2/CDDP/2.0,
2、并予以甲基转移酶抑制剂5一氮_2一脱氧胞苷(5一Aza—CdR)处理;将Runx3一shRNA表达载体转染HepG2/CDDP.1.6细胞,RT.PCR检测处理及转染前后细胞Runx3mRNA的表达。MTT法检测细胞的增殖活性,流式细胞仪分析细胞周期,Hoechst33258检测凋亡,Westernblot检测P—gP表达的变化。结果在动态变化模型中随CDDP诱导时间的延长,Runx3mRNA的表达逐渐降低。5-aza—CdR处理后Runx3mRNA的表达增加,细胞生长受到明显抑制,s期细胞逐渐增加,凋亡细胞明显增多,细胞内P-gP的表达减少。转染
3、Runx3一shRNA载体后HepG2/CDDP一1.6细胞对CDDP的耐受性增强,G期细胞增加,P.gP的表达增加。结论Runx3基因的表达可抑制HepG2/CDDP耐药的形成,提高HepG2/CDDP细胞对化疗药物的敏感性。[关键词]Runx3;耐药;肝癌;DNA甲基化;细胞周期;RNA干扰[中图法分类号]R363.25;R735.7;R966[文献标志码]ARunx3improveschemosensitivityofhepatocellularcarcinomacellsHepG2tocisplatinGuoYuanhong,ChenWei
4、qing,FangDianliang(DepartmentofDigestiveDiseases,SecondAffiliatedHospital,ChongqingMedicalUniversity,Chongqing,400010,China)[Abstract]ObjectiveTodeterminetheeffectofRunx3indrugresistanceagainsthepatocellularcarcinomacells.MethodsHepG2/cisplatin(CDDP)kineticanti—cancerdrugresis
5、tancemodelwasconstruc—tedusinganti—cancerdruginducingmethodandtreatedwith5一Aza-2'-deoxycytidine(5-Aza—CdR)fordiferentperiodsoftime.Runx3一shRNAexpressionvectorsweretransfectedintodrug-resistantHepG2cells.Reversetranscription-polymerasechainreaction(RT—PCR)wasusedtodetectRunx3mR
6、NAexpressionbeforeandaftertransfection.CellviabilitywasevaluatedbyMTFassay,andapoptosiswasanalyzedusingHoechst33258.Flowcytometry(FCM)wasusedtodetectthecellcycledistribution,andWesternblottingwasusedtomeasuretheexpressionlevelsofP-gPandRunx3.ResultsTheexpressionofRunx3mRNAwasd
7、ecreasedwiththeincreasingdrugresistanceagainstHepG2cells.However.itwasincreasedgraduallyaftertreatedwith5-Aza—CdR,andcellproliferationwasinhibitedobviously.ThecellsatSphaseandapoptoticcellswereincreased.Also,5-Aza-CdRresultedinadecreaseofP—gP.Down—regulationofRunx3indrug—resis
8、tantHepG2cellspromo-tedthecellproliferation,thecellcyclearres
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