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Estrogen-like properties of brominated analogs of bisphenol A in the MCF-7 human breast cancer cell line

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Abstract

Tetrabromobisphenol A (TeBBPA) is a four-meta-brominated variant of bisphenol A (BPA) and is one of the most commonly used brominated flame retardants worldwide. We compared the estrogenic potency of TeBBPA, BPA and the brominated analogs mono- (MBBPA), di- (DBBPA), and tribromobisphenol A (TrBBPA) in the estrogen-dependent human breast cancer cell line MCF-7. All of the compounds competed with 17β-estradiol for binding to the estrogen receptor, although the affinity of the test chemicals to the estrogen receptor was much lower than that of 17β-estradiol. TrBBPA and TeBBPA showed a considerably lower access to the estrogen receptors within intact MCF-7 cells incubated in 100% serum compared to incubation in serum-free medium, indicating a strong binding to serum proteins. BPA, MBBPA, and DBBPA showed only a slightly reduced access to the receptors. All of the test compounds induced proliferation in MCF-7 cells, the potential decreasing with increasing number of bromo-substitutions. TeBBPA did not induce maximal cell growth, indicating cytotoxic effects at high concentrations. BPA and the brominated analogs, except TeBBPA, induced progesterone receptor and pS2 to the same extent as 17β-estradiol, although at much higher concentrations. Our studies demonstrate that compared to 17β-estradiol, BPA and the brominated analogs have much lower estrogenic potencies for all of the endpoints tested, TeBBPA being the least estrogenic compound.

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Authors and Affiliations

  1. Department of Environmental Medicine, National Institute of Public Health, Torshov, Oslo, Norway

    M. Samuelsen, C. Olsen, J.A. Holme, E. Meussen-Elholm & J.K. Hongslo

  2. University of Stockholm, Sweden

    A. Bergmann

Authors
  1. M. Samuelsen
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  2. C. Olsen
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  3. J.A. Holme
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  4. E. Meussen-Elholm
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  5. A. Bergmann
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  6. J.K. Hongslo
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Samuelsen, M., Olsen, C., Holme, J. et al. Estrogen-like properties of brominated analogs of bisphenol A in the MCF-7 human breast cancer cell line. Cell Biol Toxicol 17, 139–151 (2001). https://doi.org/10.1023/A:1011974012602

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