Zhang XY, Liu TF, Yu Y, Liu W, Cui XW. Inhibitory effect of
p15
INK4B gene transfection on proliferation of human esophageal squamous cell carcinoma cell line EC109.
Shijie Huaren Xiaohua Zazhi 2005;
13:1945-1950. [DOI:
10.11569/wcjd.v13.i16.1945]
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Abstract
AIM: To investigate the effect of p15INK4B (p15) gene transfection on the proliferation of esophageal squamous cell carcinoma cell line EC109.
METHODS: The EC109 cells were divided into 3 groups: p15 transfection group, empty plasmid transfection group and non-transfection group. pCDNA3.1(+)-p15 and pCDNA3.1(+)-neo plasmid were transfected into EC109 cells using Lipofectamine2000. The expression of exogenous p15 gene and P15 protein were detected by polymerase chain reaction (PCR) and western blot, respectively. The proliferation and apoptosis of the EC109 cells were examined by MTT, colony formation assay, flow cytometry and transmission electron microscope.
RESULTS: After transfection, p15 gene cDNA was expressed in the cells of p15 transfection group, and P15 protein was expressed at a high level. The cell growth was inhibited, and the colony formation was significantly decreased in EC109-p15 cells as compared with that in the cells of empty plasmid transfection or non-transfection group (20.8±1.3% vs 54.3±3.2%, 56.8±2.3%, P<0.01). EC109-p15 cells arrested at G1/S phase, and the population of the cells in G1 phase was significantly increased as compared with that in the cells of empty plasmid transfection group or Non-transfection group (62.45±7.08% vs 38.02±5.83%, 34.45±1.05%, P<0.01). However, the number of the cells in S phase was significantly decreased (21.12±1.31% vs 35.50±2.38%, 36.30±0.69%, P<0.01), and a Sub G1 peak (apoptosis peak) appeared. Under electron microscope, typical features of apoptosis were observed in EC109-p15 cells.
CONCLUSION: p15 gene transfection can not only inhibit the proliferation of EC109 cells, but also induce the apoptosis of the cells in vitro.
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