Bai X, Tang H, Lang FC, Guo Q. Construction of lentiviral expression vectors to silence expression of
FOXQ1 gene in colorectal cancer cell line DLD-1.
Shijie Huaren Xiaohua Zazhi 2014;
22:2752-2757. [DOI:
10.11569/wcjd.v22.i19.2752]
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Abstract
AIM: To construct lentiviral vectors to silence the expression of the FOXQ1 gene in colorectal cancer cell line DLD-1.
METHODS: According to the FOXQ1 gene sequence, three pairs of shRNAs were designed and synthesized, and then ligated to the lentiviral PLKO.1 vector. After the resulting plasmids were transfected into STB13 competent cells and cultured on ampicillin resistant culture plates, single colonies were picked to prepare plasmid DNA. The plasmids were identified by enzyme digestion and DNA sequencing. The identified plasmids and auxiliary packaging plasmids including pRSV-rev, pMDlg-pRRE, pCMV-VSV-G were jointly infected into 293-T cells by the calcium phosphate transfection method, and the lentivirus supernatants were obtained and used for infecting DLD-1 cells. After selection with puromycin, the FOXQ1-silenced cells were obtained. The efficiency of gene knockdown was then determined by real-time PCR and Western blot.
RESULTS: Enzyme digestion and DNA sequencing results showed that the shRNAs were successfully inserted into the PLKO.1 vector. Recombinant plasmids were transfected into 293-T cells and high-titer lentiviruses were formed. The lentiviruses was transduced into DLD-1 cells. FOXQ1-silenced cells were obtained after selection. Real-time PCR data and Western blot showed that the highest inhibitory efficiency for FOXQ1 expression was approximately 90.4%.
CONCLUSION: FOXQ1-silenced cells have been successfully obtained by constructing a lentivirus interference system, which provide an experimental foundation for further study of the function of the FOXQ1 gene in tumorigenesis.
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