TCF21基因对肺腺癌 A549细胞DDP化疗及放疗敏感性的影响

摘要

目的：为探讨转录因子21（TCF21）基因对人肺癌A549细胞放化疗敏感性的影响。方法利用慢病毒转染技术在肺癌A549细胞中高表达TCF21基因，以荧光定量PCR、Westernblot分析目的基因的表达，用四甲基偶氮唑蓝（MTT）法检测高表达TCF21肺腺癌A549细胞对顺铂（DDP）化疗敏感性的影响，平板克隆实验检测高表达TCF21肺腺癌A549细胞对放疗敏感性的影响。结果在72h时，随着DDP浓度的增高（0、0．625、1．250、2．500、5．000、10．000mg／L），各组细胞的抑制率相应增高，高表达组各个药物浓度时的抑制率明显高于空载体组与未转染组（P＜0．05），而后两者之间无明显差异；过表达TCF21组随着药物浓度及时间及的增加，高表达组抑制率相应增高（P＜0．05）；接受X照射后，未转染组、未转染＋放疗组、空载体组、空载体＋放疗组、高表达组及高表达＋放疗组克隆形成率分别为：95．17％±2．85％、88．20％±2．03％、93．80％±4．17％、85．60％±2．42％、71．67％±3．21％、56．00％±2．65％。结论TCF21基因高表达能显著增强肺癌A549细胞对放疗及DDP化疗敏感性。%Objective To investigate the transcription factor 21 (transcription factor 21 ,TCF21) gene on human lung cancer A549 cells sensitivity to chemotherapy .Methods Using lentivirus technology in A549 lung cancer cells highly expressed genes TCF21 ,fluorescence quantitative PCR ,Western Blot analysis were used to analyse the expression of the target gene ,MTT assay was used to detect the effect of TCF21 lung adenocarcinoma A549 cells on cisplatin (cis‐Dichlorodiamineplatinum ,DDP) chemosen‐sitivity ,and colony assay was used to detect the effect of overexpression of TCF21 lung adenocarcinoma A549 cells on radiosensitiv‐ity .Results After 72 h ,with the increasing concentration of DDP (0 ,0 .625 ,1 .250 ,2 .500 ,5 .000 ,10 .000 mg/L) ,corresponding in‐hibition rates in each group increased ,and the inhibition rate of the high expression group was significantly higher in empty vector group and untransfected group (P<0 .05) ,no significant difference between the two then;overexpression TCF21 group with drug concentration and time and increase the rate of high expression inhibition corresponding increase (P<0 .05) ;after receiving X radi‐ation ,non‐transfected group ,untransfected plus radiotherapy group ,vector group ,vector plus radiotherapy group ,high expression and high expression + radiotherapy colony formation rates were:95 .17% ± 2 .85% ,88 .20% ± 2 .03% ,93 .80% ± 4 .17% , 85 .60% ± 2 .42% ,71 .67% ± 3 .21% ,56 .00% ± 2 .65% .Conclusion TCF21 gene expression can significantly enhance the sensitiv‐ity to radiotherapy and chemotherapy DDP A549 lung cancer cells .