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• W1972954488 abstract "Previously it has been shown that progesterone, as well as estrogen, plays an important role in the growth of the mammary gland. Eighty percent of mammary progesterone receptors (PgR) are estrogen-inducible and are localized in the epithelium; the remaining 20% of PgR are estrogen-independent and appear to be localized in the mammary stroma. The purpose of the present study was to investigate how progestins promote mammary growth in relation to their interactions with epithelial and stromal components of the gland and to assess the role of estrogen in these interactions. Progestins [progesterone, [17 beta-methyl-3H]promogestone (R5020), and medroxy progesterone acetate] alone or in combination with estrogen were combined with Elvax 40P and implanted directly into mammary glands. The effect of hormones on cell proliferation was determined by observing changes in mammary gland morphology and by quantitating DNA synthesis in both epithelial and stromal cells by DNA histoautoradiography. The results demonstrate that in mammary epithelial cells the effects of progestins on mammary gland morphology and DNA synthesis are locally mediated such that proliferative changes in the hormone-implanted glands were greater than in contralateral control glands. Dose-response studies with estrogen and R5020 revealed that the extent of progestin activity was only partially dependent upon the R5020 dose with the major determining factor being the dose of estrogen. Analysis of the effect of estrogen on mammary PgR concentration indicates that the degree and pattern of the morphological response of ductal sidebranching and increases in DNA synthesis are largely due to the increase in estrogen-dependent PgR. The antiprogestin, 11 beta-(4-dimethylamino-phenyl)1-17 beta-hydroxy-17 alpha-(prop-1ynyl)-estra-4,9-diene-3-one (RU486), blocks the proliferation in the epithelium that is mediated through estrogen-dependent PgR. In contrast, in stromal cells progestin activity is not estrogen-dependent, and stimulation of DNA synthesis was not confined to the hormone-implanted glands. Furthermore, RU486 stimulates stromal cell DNA synthesis, and this response is augmented by estrogen. While progestin effects in epithelial cells appear to be mediated by estrogen-dependent PgR, the mechanism operative in stromal cells appears to be different and remains to be elucidated." @default.
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• W1972954488 date "1990-11-01" @default.
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• W1972954488 title "Progesterone Action in Normal Mouse Mammary Gland*" @default.
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• W1972954488 doi "https://doi.org/10.1210/endo-127-5-2183" @default.
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