Dai DF, Chen DY, Shao SH. Short hairpin RNA-mediated silencing of TROP2 gene in gastric cancer BGC-823 cells.
Shijie Huaren Xiaohua Zazhi 2009;
17:2021-2025. [DOI:
10.11569/wcjd.v17.i20.2021]
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Abstract
AIM: To construct eukaryotic expression vectors of short hairpin RNA (shRNA) specific for TROP2 gene and observe its silencing effect on TROP2 gene in BGC-823 cells.
METHODS: The eukaryotic expression vectors of short hairpin RNA (shRNA) specific for TROP2 were constructed by ligating pGensil1.1 plasmid (containing human U6 shRNA promoter) to TROP2-specific shRNA target sequences. After the resulting recombinant plasmids were transfected into BGC-823 cells, the cells were screened in medium containing G418 (at a concentration of 400 mg/L) for 24 h to obtain stably transfected cell strain. These stably transfected cells were then divided into W group (untransfected), HK group (transfected with random negative control plasmid), KB group (transfected with empty plasmid), T1 group, T2 group and T3 group. The expression of TROP2 gene in stably transfected cells was determined by real-time PCR and Western blot.
RESULTS: TROP2-specific shRNA target sequences were successfully inserted into eukaryotic expression vector pGensil1.1. The sequences of shRNAs inserted into the recombinant plasmids were identical to those expected. The expression levels of TROP2 mRNA and protein in cells transfected with recombinant plasmids were lower than those in untransfected cells or cells transfected with random negative control plasmid or empty plasmid. Compared with the T1 and T2 groups, TROP2-specific shRNA in the T3 group had the more strong inhibitory effect on the expression of TROP mRNA (8.79 ± 0.23 vs 9.54 ± 0.20, 9.57 ± 0.23) and protein (3.66 ± 0.11 vs 6.46 ± 0.36, 9.31 ± 0.11), and the differences were significant (all P < 0.05).
CONCLUSION: Eukaryotic expression vectors of shRNA specific for TROP2 gene are constructed successfully. The expression of TROP2 mRNA and protein is down-regulated in cells transfected with recombinant plasmids. Our study provides a new approach to the study of the function of TROP2 gene.
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