摘要
目的:设计并构建针对Snai1的微小干扰核糖核酸(miRNA),最终鉴定出有效干扰质粒并筛选稳定转染的胃癌细胞株SGC-7901。方法:设计并构建4对Snai1的pcDNATM6.2-GW/EmGFPmiR microRNA及1对无效对照microRNA干扰质粒。将干扰质粒用罗氏BD转染试剂转染胃癌细胞株SGC-7901,通过倒置荧光显微镜观察绿色荧光确定转染效率。分别用不同浓度l的杀稻瘟菌素作用于SGC-7901细胞,得到杀稻瘟菌素对SGC-7901细胞的筛选浓度。Westernblot检测4对干扰质粒、阴性对照质粒对snai1蛋白水平表达的影响。结果:测序表明,Snai1干扰序列及读码框完全正确,干扰质粒瞬时转染的SGC-7901细胞系在倒置荧光显微镜下观察绿色荧光达85%以上。杀稻瘟菌素对于SGC-7901细胞的筛选浓度为5μg/ml。Westernblot结果显示,干扰序列Mi-1对Snai1有较强的干扰效果。结论:成功构建了Snai1干扰真核表达载体,同时筛选出有效干扰质粒及稳定转染株,为进一步研究Snai1在胃癌中的作用奠定了基础。
Objective:To construct recombinant eukatyotic expression vector of micro-RNA for Snai1gene,and screen the stably transfected gastric carcinoma cell clone SGC-7901.Methods:Microinterference ribonucleic acid(miRNA) nucletides of Snai1were syn-thesized and inserted into pcDNATM6.2-GW/EmGFPmiR vector,which were confirmed by sequencing,then the recombinant miRNA vectors were transfected into SGC-7901 by Roche BD.The transfection efficiency was observed under inverted fluorescence microscope.According to the fatal dose of blasticidin to SGC-7901,and the selection concentration of blasticidin to SGC-7901 cell.The protein ex-pression of Snai1was detected by Western blot.Results:Sequencing suggested that miRNA eukaryotic expression vectors targeting Snia1 possesse correct nucleotide sequence and read frame,and the express of the green fluorescent protein was over 85% when the transient transfected SGC-7901 cell line observed nuder inverted fluorescence microscope.The screening concentration of blasticidin to SGC-7901 cell was 5μg/ml.The results of Western blot showed that the sequence of Mi-1could more effectively knockdown the expres-sion level of Snai1 than the others.Conclusion:miRNA eukaryotic expression vectors targeting Snia1 were successfully constructed and the effectively interference miRNA were identified,and the stably transfected cell clone obtained may be useful for understanding the ef-fect of Snai1 in gastric cancer.
出处
《现代生物医学进展》
CAS
2011年第2期211-214,共4页
Progress in Modern Biomedicine
关键词
Snai1
微小干扰核糖核酸
Snai1
Microinterference ribonucleic acid(miRNA)