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Response of the ABCG2 promoter in T47D cells and BeWo cells to sex hormone treatment

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Abstract

The aim of this study was to elucidate the effects of sex hormones on activity of the ABCG2 promoter in different cell lines. T47D cells and BeWo cells were used as models for ABCG2-expressing cell lines, and luciferase assays using ABCG2 promoter–luciferase constructs were performed. It was shown that progesterone increased the response of the ABCG2 promoter in T47D cells but not in BeWo cells. On the other hand, estradiol had no effect on response of the ABCG2 promoter in either cell line. However, response of the ABCG2 promoter was enhanced by overexpression of ERα in both T47D cells and BeWo cells. T47D cells had higher sensitivity to ERα than did BeWo cells. Furthermore, it was shown that the inductive effect of progesterone on the ABCG2 promoter was inhibited by addition of RU486 or mithramycin A. Therefore, it was thought that the ABCG2 promoter responded to stimulation of the progesterone receptor (PR)-Sp1 pathway in T47D cells. Furthermore, progesterone suppressed the response of the ABCG2 promoter by changing the expression levels of PR-A and PR-B in BeWo cells. These findings suggested that there are differences between cell lines in the regulation mechanism of ABCG2 expression by sex hormone treatment.

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Authors and Affiliations

  1. Laboratory of Clinical Pharmaceutics & Therapeutics, Division of Pharmasciences, Faculty of Pharmaceutical Sciences, Hokkaido University, Kita 12-jo, Nishi 6-chome, Kita-ku, Sapporo, 060-0812, Japan

    Satoru Yasuda, Masaki Kobayashi, Shirou Itagaki, Takeshi Hirano & Ken Iseki

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  1. Satoru Yasuda
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  2. Masaki Kobayashi
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  3. Shirou Itagaki
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  4. Takeshi Hirano
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  5. Ken Iseki
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Correspondence to Ken Iseki.

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Yasuda, S., Kobayashi, M., Itagaki, S. et al. Response of the ABCG2 promoter in T47D cells and BeWo cells to sex hormone treatment. Mol Biol Rep 36, 1889–1896 (2009). https://doi.org/10.1007/s11033-008-9395-0

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  • DOI: https://doi.org/10.1007/s11033-008-9395-0

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