MACC1基因shRNA慢病毒表达载体的构建及转染MB-231细胞

Construction of lentiviral vector for shRNA of MACC1 gene and its transfection into MB-231

目的构建结肠癌转移相关基因1(MACC1)RNAi慢病毒表达载体,并转染人乳腺癌细胞株MB-231,观察其最佳感染条件。方法设计并合成MACC1基因特异性的DNA寡核苷酸,连接到经AgeⅠ和EcoRⅠ双酶切线性化的pMAGic慢病毒质粒载体中,转化大肠埃希菌DH5a感受态细胞,筛选阳性菌落、扩增后提取质粒,进行DNA测序鉴定。用293FT细胞包装产生慢病毒,感染MB-231细胞,选择感染效率高、感染复数(MOI)低的感染条件。结果 PCR与测序鉴定证实成功构建了MACC1RNAi的慢病毒载体,可以高效转染MB-231细胞,其最佳感染条件为MOI=40。结论成功构建了MACC1RNAi慢病毒表达载体,其可高效感染MB-231,为进一步研究靶向MACC1RNAi对乳腺癌细胞恶性生物学行为变化及基因治疗研究奠定了实验基础。

Objective To construct a lentiviral vector for RNA interference（RNAi）of MACC1 gene and to detect the best trans-fection condition by transfected into MB-231 cells .Methods The siRNA was designed and converted into cDNA of shRNA （small hair pin RNA） of siRNA for MACC1 gene .The cDNA was synthesized and inserted into pMAGic lentiviral plasmid vector which was linearized by enzyme Age Ⅰ and EcoRⅠ .The recombinant plasmid was transformed into competent E .coli DH5α cells .The positive recombinant colony was selected by ampicillin medium agar and identified by DNA sequencing .The recombinant lentivirus was packaged into mature lentivirus by 293FT cells and used to infect MB-231 cells .To detected the transfection condition of high efficiency of infection and low multiplicity of infection .Results PCR and sequencing verified that the recombinant lentivirus plasmid MACC1-shRNA was successfully constructed .The best transfection condition was MOI=40 by transfected into MB-231 .Conclu-sion The lentiviral RNAi expression vector targeting MACC 1 gene is successfully constructed and it can infect MB-231 cells effi-ciently ,which lays the experimental foundation for the research on the changes of malignant biological activity of tumor cell lines and gene therapy .