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Chinese Journal of Breast Disease(Electronic Edition) ›› 2019, Vol. 13 ›› Issue (03): 165-172. doi: 10.3877/cma.j.issn.1674-0807.2019.03.006

Special Issue:

• Original Article • Previous Articles     Next Articles

Effect of pycnogenol on proliferation, migration and metastasis of human breast cancer MCF-7 cells

Chunshu Yang1, Guangyuan Qin1, Xinyu Zheng2,()   

  1. 1. Laboratory No.1 of Cancer Institute, First Affiliated Hospital of China Medical University, Shenyang 110001, China
    2. Laboratory No.1 of Cancer Institute, First Affiliated Hospital of China Medical University, Shenyang 110001, China; Department of Breast Surgery, First Affiliated Hospital of China Medical University, Shenyang 110001, China
  • Received:2018-12-20 Online:2019-06-01 Published:2019-06-01
  • Contact: Xinyu Zheng
  • About author:
    Corresponding author: Zheng Xinyu, Email:

Abstract:

Objective

To investigate the inhibitory effect of the antioxidant pycnogenol on human breast cancer MCF-7 cells, and to observe the effect of pycnogenol on the metastasis and migration of MCF-7 cells.

Methods

MCF-7 cells were treated with 10, 20, 40 μg/ml pycnogenol, respectively, as experimental groups. The control group was only treated with blank DMEM medium (without fetal bovine serum). The optical density of MCF-7 cells at the wavelength of 490 nm was determined by the MTT method at 24, 48 and 72 h after treatment. The apoptosis rate of MCF-7 cells was measured by the flow cytometry. The senescence rate of MCF-7 cells was measured by β-galactosidase staining. The effect of pycnogenol at different concentrations on the migration and invasion of MCF-7 cells were detected by Transwell chamber assay. The expression of senescence-associated proteins P53, P21, P16, P27 and E2F1 in MCF-7 cells was determined by Western blot analysis. The expression of matrix metalloproteinase (MMP)-2 and MMP-9 was also determined by Western blot analysis. The number of migrated cells and metastatic cells, and the protein expression among four groups were compared by one-factor analysis of variance. The optical density was compared by repeated measurement analysis of variance and pairwise comparison was performed by LSD method.

Results

The result of MTT assay showed that at 24, 48, and 72 h after treatment, the optical density of breast cancer MCF-7 cells was significantly different among four groups (F=149.439, P<0.001) and at different time points (F=27.922, P<0.001); there was an interaction between grouping and time points (F=18.466, P<0.001). The result of flow cytometry showed that the apoptosis rate of MCF-7 cells was (2.36±0.27)%, (6.44±1.43)%, (7.52±2.09)% and (11.68±1.65)% in the blank control group, 10, 20 and 40 μg/ml pycnogenol group, respectively, indicating a significant difference (F=19.143, P<0.001). The result of β-galactosidase staining showed that the senescence rate of MCF-7 cells was (5.35±1.32)%, (20.08±2.14)%, (40.55±4.61)% and (59.26±4.10)% in the blank control group, 10, 20 and 40 μg/ml pycnogenol group, respectively, indicating a significant difference (F=150.150, P<0.001). The result of Transwell chamber assay showed that the number of migrated cells was 41±5, 27±2, 19±1 and 11±2 in the blank control group, 10, 20 and 40 μg/ml pycnogenol group, respectively, indicating a significant difference (F=59.330, P<0.001); the number of metastatic cells was 24±4, 17±1, 12±2 and 7±2, respectively in the blank control group, 10, 20 and 40 μg/ml pycnogenol group, respectively, indicating a significant difference (F=26.230, P<0.001). Western blot results showed that pycnogenol up-regulated the expression of P53, P21, P16 and P27 (F=263.905, 424.937, 217.515, 391.115, all P<0.001), and down-regulated the expression of E2F1 (F=64.003, P<0.001); the expression levels of MMP-2 and MMP-9 in MCF-7 cells were significantly decreased (F=44.104, 45.594, both P<0.001).

Conclusion

Pycnogenol may inhibit the growth of breast cancer MCF-7 cells by promoting the cellular senescence and it can also inhibit the cell migration and metastasis.

Key words: Breast neoplasms, Cellular senescence, Migration, Metastasis, Pycnogenol

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