Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Treatment with Phytoestrogens Reversed Triclosan and Bisphenol A-Induced Anti-Apoptosis in Breast Cancer Cells

  • Lee, Geum-A (Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University) ;
  • Choi, Kyung-Chul (Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University) ;
  • Hwang, Kyung-A (Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University)
  • Received : 2017.08.14
  • Accepted : 2017.10.23
  • Published : 2018.09.01
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Abstract

Triclosan (TCS) and bisphenol A (BPA) are endocrine-disrupting chemicals that interfere with the hormone or endocrine system and may cause cancer. Kaempferol (Kaem) and 3,3'-diindolylmethane (DIM) are phytoestrogens that play chemopreventive roles in the inhibition of carcinogenesis and cancer progression. In this study, the influence of TCS, BPA, Kaem, and DIM on proliferation and apoptotic abilities of VM7Luc4E2 breast cancer cells were examined. MTT assay revealed that TCS ($0.1-10{\mu}M$), BPA ($0.1-10{\mu}M$) and E2 ($0.01-0.0001{\mu}M$) induced significant cell proliferation of VM7Luc4E2 cells, which was restored to the control (0.1% DMSO) by co-treatment with Kaem ($30{\mu}M$) or DIM ($15{\mu}M$). Reactive oxygen species (ROS) production assays showed that TCS and BPA inhibited ROS production of VM7Luc4E2 cells similar to E2, but that co-treatment with Kaem or DIM on VM7Luc4E2 cells induced increased ROS production. Based on these results, the effects of TCS, BPA, Kaem, and DIM on protein expression of apoptosis and ROS production-related markers such as Bax and Bcl-xl, as well as endoplasmic reticulum (ER) stress-related markers such as $eIF2{\alpha}$ and CHOP were investigated by Western blot assay. The results revealed that TCS, and BPA induced anti-apoptosis by reducing ROS production and ER stress. However, Kaem and DIM effectively inhibited TCS and BPA-induced anti-apoptotic processes in VM7Luc4E2 cells. Overall, TCS and BPA were revealed to be distinct xenoestrogens that enhanced proliferation and anti-apoptosis, while Kaem and DIM were identified as natural chemopreventive compounds that effectively inhibited breast cancer cell proliferation and increased anti-apoptosis induced by TCS and BPA.

Keywords

References

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