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• W2059605465 abstract "Three promoters have been identified for the human estrogen receptor-alpha gene. The positions of promoters A and B are known whereas that of the recently identified promoter C is not. Cloning and hybridization experiments demonstrated that promoter C is located more than 21 kb upstream of promoter A. The use of the three promoters was examined in estrogen receptor-positive breast cancer cell lines, cell lines derived from other malignancies, and some normal tissues by RT-PCR and transient transfection. All estrogen-responsive breast cancer cell lines used all three promoters, apart from ZR-75 cells, which did not use promoter B in one of two sublines examined. Cell lines derived from other malignancies and other normal tissues that express lower levels of estrogen receptor-alpha showed more selective promoter usage. This suggests that the level of expression of estrogen receptor-alpha is determined by the number of promoters used, rather than the selective use of specific promoters. We also show that promoter C is used more widely than suggested by others. Analysis of a series of estrogen receptor-positive primary breast tumors showed that all three promoters were used in all the tumors. All three promoters were modulated by estrogen in estrogen-responsive breast cancer cell lines: all three promoters were down-regulated by estrogen in MCF-7 cells in which estrogens reduce receptor expression whereas all promoters used were upregulated in T47D, ZR-75, and EFM-19 cells in which estrogens increase receptor expression. This suggests that it is the repertoire of transcription factors present within a cell rather than the selective use of a specific promoter that determines whether estrogen receptor-alpha expression is increased or decreased by estrogen." @default.
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• W2059605465 date "1999-11-01" @default.
• W2059605465 modified "2023-09-30" @default.
• W2059605465 title "Selective Promoter Usage of the Human Estrogen Receptor-α Gene and Its Regulation by Estrogen" @default.
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• W2059605465 doi "https://doi.org/10.1210/mend.13.11.0366" @default.
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