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- W2024894627 abstract "The expression level and functional activity of estrogen receptor αis an important determinant of breast physiology and breast cancer treatment. However, it has been difficult to identify the signals that regulate estrogen receptor because cultured mammary epithelial cells generally do not respond to estrogenic signals. Here, we use a combination of two- and three-dimensional culture systems to dissect the extracellular signals that control endogenous estrogen receptor α. Its expression was greatly reduced when primary mammary epithelial cells were placed on tissue culture plastic; however, the presence of a reconstituted basement membrane in combination with lactogenic hormones partially prevented this decrease. Estrogen receptor αexpression in primary mammary fibroblasts was not altered by these culture conditions, indicating that its regulation is cell type specific. Moreover,estrogen receptor-dependent reporter gene expression, as well as estrogen receptor α levels, were increased threefold in a functionally normal mammary epithelial cell line when reconstituted basement membrane was added to the medium. This regulatory effect of reconstituted basement membrane was reproduced by two of its components, collagen-IV and laminin-1, and it was blocked by antibodies against α2, α6 and β1 integrin subunits. Our results indicate that integrin-mediated response to specific basement membrane components, rather than cell rounding or cell growth arrest induced by reconstituted basement membrane, is critical in the regulation of estrogen receptor α expression and function in mammary epithelial cells." @default.
- W2024894627 created "2016-06-24" @default.
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- W2024894627 creator A5029516932 @default.
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- W2024894627 date "2003-07-15" @default.
- W2024894627 modified "2023-10-09" @default.
- W2024894627 title "Collagen-IV and laminin-1 regulate estrogen receptor α expression and function in mouse mammary epithelial cells" @default.
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- W2024894627 doi "https://doi.org/10.1242/jcs.00523" @default.
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