Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Effects of $\alpha$-lipoic acid on cell proliferation and apoptosis in MDA-MB-231 human breast cells

  • Na, Mi-Hee (Department Food Science and Nutrition, Dankook University) ;
  • Seo, Eun-Young (Department Food Science and Nutrition, Dankook University) ;
  • Kim, Woo-Kyoung (Department Food Science and Nutrition, Dankook University)
  • Published : 2009.12.31
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Abstract

The role that antioxidants play in the process of carcinogenesis has recently gained considerable attention. $\alpha$-Lipoic acid, a naturally occurring disulfide molecule, is a powerful antioxidant that reportedly exerts beneficial effects in patients with advanced cancer by reducing the level of reactive oxygen species and increasing glutathione peroxidase activity. In this study, we examined changes in the protein and mRNA expression associated with cell proliferation and apoptosis in MDA-MB-231 breast cancer cultured in the presence of various concentrations (0, 250, 500, and 1000 ${\mu}mol/L$) of $\alpha$-lipoic acid. The results revealed that $\alpha$-lipoic acid inhibited the growth of breast cancer cells in a dose-independent manner (P < 0.05). Additionally, $ErbB_2$ and $ErbB_3$ protein and mRNA expressions were significantly decreased in a dose-dependent manner in response to $\alpha$-lipoic acid (P < 0.05). Furthermore, the protein expression of phosphorylated Akt (p-Akt) levels and total Akt, and the mRNA expression of Akt were decreased dose-dependently in cells that were treated with $\alpha$-lipoic acid (P < 0.05). Bcl-2 protein and mRNA expressions were also decreased in cells that were treated with $\alpha$-lipoic acid (P < 0.05). However, Bax protein and mRNA expressions were increased in cells treated with $\alpha$-lipoic acid (P < 0.05). Finally, caspase-3 activity was significantly increased in a dose-dependent manner in cells treated with $\alpha$-lipoic acid (P < 0.05). In conclusion, we demonstrated that $\alpha$-lipoic acid inhibits cell proliferation and induces apoptosis in MDA-MB-231 breast cancer cell lines.

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References

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