Acta Anatomica Sinica

Acta Anatomica Sinica ›› 2019, Vol. 50 ›› Issue (6): 761-765.doi: 10.16098/j.issn.0529-1356.2019.06.010

• Cancer Biology • Previous Articles     Next Articles

Effect of Bak gene overexpression on proliferation of breast cancer MCF-7 cells and sensitivity to paclitaxel

SHAO Hua1 FENG Chuan-bo1 WANG Zhong-lin1 ZHU Shuang-jiu1 ZHANG Ying2 ZHU Ming-zhen 3*   

  1. 1.Thyroid and Breast Surgery; 2.Department of Clinical Laboratory; 3.Department of Oncology, the Second People’s Hospital of Lianyungang City, Jiangsu Lianyungang 222000, China
  • Received:2018-11-21 Revised:2018-12-17 Online:2019-12-06 Published:2019-12-06
  • Contact: ZHU Ming-zhen E-mail:shaohua7492@163.com

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Abstract:

Objective To investigate the effect of Bak gene overexpression on proliferation of breast cancer MCF-7 cells and sensitivity to paclitaxel. Methods Western blotting and Real-time PCR were used to detect the expression of Bak protein in breast cancer MCF-7 cells before and after transfection. The effects of Bak gene overexpression and paclitaxel treatment for 24 hours, 48 hours and 72 hours on MCF-7 cell proliferation and cell cycle were detected by cell counting kit-8(CCK-8) and flow cytometry. Results The results of Western blotting and Real-time PCR showed that the expression of Bak protein increased significantly after transfection.The results of Western blotting and Real-time PCR showed that the expression of Bak protein increased significantly after transfection, and the mRNA expression of MCF-7-Bak group was 2.15±0.07, which was significantly higher than that of MCF-7-NC group,which was 1.03±0.04(t=13.412, P<0.05).After 48 hours, 72 hours and 96 hours of transfection, the proliferation rates of MCF-7-Bak cells were (0.31±0.03)%, (0.37±0.03)%, (0.47±0.04)%, respectively, which were lower than that of MCF-7 NC group(0.40±0.03)%, (0.48±0.04)%, (0.61±0.06)%, and the difference was statistically significant (t 48=2.145, t 72=3.164, t 96=5.487, P<0.05). The number of G2 phase cells in MCF-7 Bak group were (26.84±2.69)% significantly higher than that in MCF-7 NC group (16.02±1.61)% (t=12.887, P<0.05). After 24 hours, 48 hours, and 72 hours of paclitaxel treatment, the cell inhibition rate of MCF-7-Bak group was (35.98±4.00)%, (54.66±5.50)%, (80.11±8.00)%, respectively, which were higher than that of MCF-7 NC group (24.12±2.40)%, (40.12±4.00)%,(61.09±6.09)%. And the difference was statistically significant (t 24=8.456, t 48=10.547, t 72=13.442, P<0.05). After 24 hours of paclitaxel treatment, the number of G2 phase cells in MCF-7 Bak group was (73.01±7.02)% higher than that in MCF-7 NC group (63.84±6.68) %(t=9.736, P<0.05). Conclusion Up-regulate of Bak gene expression can inhibit the proliferation of breast cancer MCF-7 cells, up-regulating the proportion of G0/G1 phase, and enhance the sensitivity of paclitaxel.

Key words: Bak, MCF-7 cell, Paclitaxel, Sensitivity, Western blotting, Human