【摘要】 目的构建针对人MAGE3基因的小干扰RNA(siRNA)表达载体,观察RNA干扰介导的MAGE3基因表达默寂对肺癌细胞定植和转移的影响。方法设计MAGE3靶向的发夹状siRNA,依据设计合成两条互补的寡核苷酸链,退火后连接入pSUPERneoGFP载体,转化扩增后进行序列测定。用脂质体包裹转染人肺癌细胞NCI-H446,采用RT-PCR和Western印迹检测MAGE3基因mRNA和蛋白表达水平的变化。用软琼脂克隆形成实验和细胞体外侵袭实验,观察对肿瘤形成能力和侵袭力的影响。结果把针对MAGE3基因的siRNA的双链寡核苷酸片段克隆入pSUPERneoGFP载体,经过酶切鉴定与测序,结果正确;RT-PCR和Western印迹检测显示,MAGE3基因的表达水平明显降低;转染siRNA表达载体组的肺癌细胞在软琼脂中形成克隆数和穿透Matrigel的细胞数都显著下降,与未转染和转染空载体组比较差异有显著性(P<0.05)。结论成功构建了针对MAGE3基因的siRNA载体,RNA干扰介导的MAGE3基因表达沉寂可有效降低肺癌细胞定植和转移。更多还原

【Abstract】 objective To construct small interfering RNA(siRNA) expression vectors targeting human MAGE3 gene and to observe the effects of gene silencing of MAGE3 by RNA interference on location and metastasis of lung carcinoma cells. Methods MAGE3 mRNA targeted hairpin siRNA was devised and the oligonucleotide strands of DNA fragments encoding the above siRNA were synthesized. After annealing of the complementary strands, the DNA fragments were cloned into pSUPERneoGFP, followed by amplification and DNA sequencing, then transfected into human lung carcinoma NCI-H446. The expression of MAGE3 gene mRNA and protein were examined by RT-PCR and Western blotting. Colony formation assay and Boyden chmber assay were performed to detect the effects of MAGE3 on colony formation and metastasis. Results The DNA fragments encoding MAGE3-targeted siRNA were cloned into the pSUPERneoGFP and confirmed by restrictive enzyme digestion and DNA sequencing. RT-PCR and Western blotting revealed a strongly decreased expression level of MAGE3. The lung carcinoma cells transfected by siRNA group was significantly lower than others, an effect on its colony formation and invasiveness. The colony formation of lung carcinoma cells transfected by siRNA in soft agar and the number of cells penetrating matrigel both reduced, there is significant difference compared with untransfected group and transfected empty vector. Conclusion An siRNA vector targeting human MAGE3 gene has been successfully constructed. Expression silencing of MAGE3 by RNA interference could reduce location and metastasis of lung carcinoma cells effectively.更多还原