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- W2038934678 abstract "In Brief Objective: Lasofoxifene, a new selective estrogen-receptor modulator (SERM), shows efficacy in vaginal and vulvar atrophy in postmenopausal women. Here, we sought to explore the possible mechanisms of action for this effect in comparison with other SERMs using an immature ovariectomized rat model. Design: SERMs (lasofoxifene, raloxifene, and tamoxifen) and 17α-ethinyl estradiol were administered orally to immature ovariectomized rats daily for 1 or 4 days. Vaginal and uterine tissues were weighed and processed for histomorphometric measurements, vaginal mucopolysaccharide staining, and immunohistochemistry of 5-bromo-2′-deoxyuridine and steroid receptors. Receptor quantification was determined by a novel ultrasensitive enzyme-linked immunosorbent assay method. Results: Lasofoxifene and raloxifene showed a minimal increase in vaginal and uterine weight, epithelial cell proliferation, and epithelial thickness in comparison with estradiol and tamoxifen. Lasofoxifene significantly enhanced vaginal mucus formation in a dose-dependent manner. Vaginal progesterone receptor protein was increased fivefold by estradiol and all three SERMs tested. 17α-Ethinyl estradiol caused a significant decrease in estrogen receptor α, but no change with other treatments. Only lasofoxifene significantly increased vaginal estrogen receptor β and androgen receptor protein levels. Conclusions: These results demonstrated that lasofoxifene stimulated vaginal mucus formation without causing cell proliferation in the rat reproductive tract. These effects may be due to the increased vaginal estrogen receptor β and androgen receptor levels. This cellular and molecular profile of lasofoxifene in the vagina may account for its efficacy in the treatment of vaginal and vulvar atrophy in postmenopausal women. Lasofoxifene stimulated vaginal mucification without causing vaginal or uterine cell proliferation. These unique effects of lasofoxifene may be attributed to an increase in estrogen receptor β and androgen receptor." @default.
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- W2038934678 date "2006-07-01" @default.
- W2038934678 modified "2023-10-18" @default.
- W2038934678 title "Lasofoxifene enhances vaginal mucus formation without causing hypertrophy and increases estrogen receptor β and androgen receptor in rats" @default.
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- W2038934678 doi "https://doi.org/10.1097/01.gme.0000227337.73738.c9" @default.
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