慢病毒介导的siRNA靶向干扰EIF4G1鼻咽癌稳定细胞株的建立

Establishment of a stable nasopharyngeal carcinoma cell line with lentivirus-mediated RNA interference for EIF4G1 gene silencing

目的检测人真核翻译起始因子4G1(EIF4G1)基因在8株鼻咽癌细胞中的差异表达,寻找最高表达的细胞株。构建EIF4G1基因的小干扰RNA(siRNA)表达载体,建立稳定干扰EIF4G1表达的鼻咽癌细胞株,测定干扰效率。方法应用荧光定量PCR检测EIF4G1mRNA在鼻咽癌细胞株5-8F、6-10B、C666-1、CNE1、CNE2、HNE1、HONE1、SUNE1表达水平。构建重组靶向EIF4G1shRNA慢病毒表达质粒pLenti6/BLOCK-iT-DEST/EIF4G1shRNA。用293FT细胞包装后产生的成熟慢病毒颗粒感染5-8F细胞,经杀稻瘟菌素筛选后,建立稳定表达siRNA的5-8F鼻咽癌细胞株。最后荧光定量PCR检测干扰效率。结果在8个鼻咽癌细胞株中,EIF4G1显示在5-8F细胞株中表达最高。PCR和测序验证pLenti6/BLOCK-iT-DEST/EIF4G1shRNA重组质粒构建成功;经293FT细胞病毒包装,感染5-8F细胞后,与阴性对照组和未干扰组相比可明显抑制EIF4G1mRNA水平EIF4G1表达。结论成功构建了pLenti6/BLOCK-iT-DEST/EIF4G1shRNA慢病毒重组质粒,建立了稳定靶向干扰EIF4G1表达的siRNA5-8F鼻咽癌细胞株。

Objective To establish a nasopharyngeal carcinoma （NPC） cell line with stable EIF4G1 gene silencing induced by small interfering RNA （siRNA）. Methods The EIF4G1 mRNA levels in 8 NPC cell lines including 5-8F, 6-10B, C666-1, CNE1, CNE2, HNE1, HONE1, and SUNE1 were detected by fluorescence quantitative RT-PCR （QRT-PCR）. The recombinant lentivirus shRNA expression plasmid targeting EIF4G1 gene was packaged into mature lentivirus by 293FT cells and used to infect 5-8F cells. After blasticidin selection of NPC cells with constant expression of the EIF4G1-siRNA, the efficiency of EIF4G1 mRNA expression interference was determined using QRT-PCR. Results The 8 NPC cell lines showed differential expression of EIF4G1 mRNA, among which 5-8F cells had the highest EIF4GI expression. The recombinant lentivirus plasmid pLenti6/BLOCK-iT-DEST/EIF4GI-shRNA was successfully constructed and verified by PCR and sequencing. The EIF4G1 mRNA level of 5-8F cells infected with shRNA-EIF4G1 lentivirus was significantly reduced as compared with the negative control and the blank control cells. Conclusion The recombinant lentivirus vector pLenti6/BLOCK- iT-DEST/ E1F4GI-shRNA we constructed results in marked downregulation of EIF4G1 mRNA expression and constant expression of EIF4GI-siRNA after infection of 5-8F cells.