Li YJ, Huang Y, Ruan XL, Liao LF, Wu Q, Huang WT, Xu H. Transfection of a eukaryotic vector expressing a mutant CDK4 up-regulates POLD1 expression in SMMC-7702 cells.
Shijie Huaren Xiaohua Zazhi 2012;
20:1705-1712. [DOI:
10.11569/wcjd.v20.i19.1705]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To construct a eukaryotic expression vector encoding a mutant CDK4 protein and to investigate the effect of transfection of this vector on POLD1 expression in SMMC-7702 cells.
METHODS: The mutant CDK4 gene was amplified by RT-PCR from total RNA isolated from the human hepatocarcinoma cell line SMMC-7721, digested, and inserted into the eukaryotic expression vector pEGFP-C1. The resultant recombinant plasmid was confirmed by sequencing. After the recombinant plasmid was transfected into SMMC-7702 cells using Lipofectamine 2000, the expression of fusion protein was observed by fluorescence microscopy, and expression of CDK4 and POLD1 mRNAs was detected by real-time PCR.
RESULTS: The eukaryotic expression plasmid GFP-CDK4 was successfully constructed. The mutant CDK4 gene contained 5 base mutation sites, 4 base insertions and 2 deletions, which caused 7 amino acids to change. Compared to non-tranfected cells or cells transfected with the pEGFP-C1 vector, cell proliferation was significantly higher in cells transfected with the recombinant vector (0.826 ± 0.08 vs 0.596 ± 0.06, 0.609 ± 0.10, F = 7.033, P < 0.05). The expression levels of CDK4 and POLD1 genes in cells transfected with the recombinant vector was significantly higher than those in the two control groups (1.94 ± 0 .11 vs 1.01 ± 0.00, 1.05 ± 0.12, F = 54.046, P < 0.01; 0.54 ± 0.04 vs 0.30 ± 0.07, 0.25 ± 0.06, F = 11.788, P < 0.05). Similar results were also obtained for the protein expression levels of CDK4 (0.65 ± 0.03 vs 0.41 ± 0.03, 0.39 ± 0.05, F = 14.665, P < 0.05) and P125 (0.54 ± 0.04 vs 0.30 ± 0.07, 0.25 ± 0.06, F = 11.788, P < 0.05).
CONCLUSION: Tranfection of the eukaryotic expression plasmid GFP-CDK4 significantly increases the proliferation and invasion of SMMC-7702 cells possibly by up-regulating POLD1 expression.
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