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- W2083426370 abstract "Recent studies indicate that the expression of ER beta in breast cancer is lower than in the normal breast, suggesting that ER beta could play an important role in carcinogenesis. To investigate this hypothesis, we engineered ER-negative MDA-MB-231 (human breast cancer cells) to reintroduce either ER alpha or ER beta protein with an adenoviral vector. In these cells, ER beta (as ER alpha) expression was monitored using RT-PCR and Western blot. ER beta protein was localized in the nucleus (immunocytochemistry) and able to transactivate estrogen-responsive reporter constructs in the presence of E2. ER beta and ER alpha induced the expression of several endogenous genes such as pS2, TGF alpha, or the cyclin kinase inhibitor p21 but, in contrast to ER alpha, ER beta was unable to regulate c-myc proto-oncogene expression. The pure antiestrogen ICI 164, 384 completely blocked ER alpha and ER beta estrogen-induced activities. ER beta inhibited MDA-MB-231 cell proliferation in a ligand-independent manner, whereas ER alpha inhibition of proliferation is hormone dependent. Moreover, ER beta and ER alpha decreased cell motility and invasion. Our data bring the first evidence that ER beta is an important modulator of proliferation and invasion of breast cancer cells and support the hypothesis that the loss of ER beta expression could be one of the events leading to the development of breast cancer." @default.
- W2083426370 created "2016-06-24" @default.
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- W2083426370 date "2001-09-01" @default.
- W2083426370 modified "2023-10-10" @default.
- W2083426370 title "ERβ Inhibits Proliferation and Invasion of Breast Cancer Cells" @default.
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- W2083426370 doi "https://doi.org/10.1210/endo.142.9.8395" @default.
- W2083426370 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2040491" @default.
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