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• W2051200560 abstract "Objective Local application of estradiol (E2) to treat vulvovaginal atrophy in postmenopausal breast cancer patients receiving aromatase inhibitors is known to elevate serum estradiol levels and thereby might counteract breast cancer therapy. Thus, vaginal application of estriol (E3) has been recommended for these patients. However, it is unclear to what extent E3 stimulates breast cancer cell growth. In this study, we examined the effect of E3 on growth and gene expression of two human breast cancer cell lines. Methods We used an established in vitro cell culture assay and compared the effect of E2 and E3 on growth of the estrogen receptor alpha-positive breast cancer cell lines MCF-7 and T-47D testing a wide range of hormone concentrations of 10−12–10−7 M. E3 effects on gene expression were examined by means of reporter gene assays, RT-qPCR and Western blot analysis. Results E3 acted as a potent estrogen and exerted a mitogenic effect on T-47D and MCF-7 cells at concentrations of 10−9 M (288 pg/ml) and higher. With regard to activation of an estrogen response element (ERE) in breast cancer cells, effects of E3 were visible at 10−10 M. The same concentrations of E3 activated expression of the estrogen-responsive gene PR and of the proliferation genes cyclin A2, cyclin B1, Ki-67, c-myc and b-myb, providing molecular mechanisms underlying the observed growth increase. Conclusions Like E2, low levels of E3 were able to trigger a robust estrogenic response in breast cancer cells. Thus, our data suggest caution regarding use of E3 by breast cancer survivors." @default.
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• W2051200560 date "2014-04-01" @default.
• W2051200560 modified "2023-09-27" @default.
• W2051200560 title "Effects of estriol on growth, gene expression and estrogen response element activation in human breast cancer cell lines" @default.
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• W2051200560 doi "https://doi.org/10.1016/j.maturitas.2014.01.004" @default.
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