【摘要】 目的构建人Snail基因慢病毒干扰载体及观察干扰前后对鼻咽癌5-8F细胞增殖和侵袭的影响。方法设计Snail基因特异性RNAi靶序列,克隆至经双酶切后的plVTHM线性化载体,测序鉴定正确后,用病毒上清感染鼻咽癌细胞5-8F,流式细胞仪分选获得稳定干扰Snail基因的细胞亚系。荧光定量PCR检测mRNA表达情况;MTT法和体外侵袭实验分别测定对细胞增殖和侵袭的影响。结果plVTHM-siSnail慢病毒干扰载体构建正确。荧光定量PCR结果表明分选后的细胞Snail mRNA水平表达显著降低。干扰后的细胞增殖减慢,穿透基膜的细胞数量减少,差异具有统计学意义(P<0.05)。结论plVTHM-siSnail表达质粒可显著下调Snail基因在5-8F中的表达,在一定程度上抑制鼻咽癌细胞的增殖和侵袭。更多还原

【Abstract】 Objective To construct a recombinant lentiviral expression vector for RNA interference (RNAi) of human Snail gene and to study its effects on the proliferation and invasion of nasopharyngeal carcinoma cell line 5-8F. Methods The effective sequence of short hairpin RNAs (shRNA) targeting Snail gene was designed and cloned into the linear pLVTHM vector after enzyme digestion. After confirmation by DNA sequencing, 5-8F cells were infected with the viral supernatants. The cells with stable Snail gene knock-down were separated by fluorescence activated cell sorter (FASC). The expression of Snail mRNA was detected by real time RT-PCR. MTT and cell invasion assay were used to detect the proliferation and invasion of 5-8F cells after plVTHM-siSnail transfection. Results The lentivirus vector plVTHM-siSnail was constructed successfully. The separated 5-8F-plVTHM-siSnail exhibited significant knock-down of Snail mRNA expression. Slower proliferation and decreased cells to permeate through the Matrigel were found after plVTHM-siSnail transfection (P<0.05). Conclusion plVTHM-siSnail vector could down-regulate Snail gene expression in human nasopharyngeal carcinoma 5-8F cells and suppress its invasion and proliferation to some extent.更多还原