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- W2019938322 abstract "Estradiol (E2) regulation of estrogen receptor (ER) concentrations has been shown to be both time- and dose-dependent. E2 concentrations of 0.5 mg/ml or greater contained in Silastic capsules suppressed uterine ER concentrations after one day's exposure. In this study, we looked at the effects of physiological (1.0 and 10.0 micrograms subcutaneous injections) and pharmacological (5.0 mg/ml implants) doses of E2 on ER concentrations at times less than 24 hours. The implanted rats had maximum E2 plasma levels of approximately 2000 pg/ml for at least six hours which fell to around 800 pg/ml by 12 hours where they remained up to 24 hours. The physiological doses resulted in plasma levels at one hour of 2000 pg/ml (10 micrograms dose) and 250 pg/ml (1 microgram dose) both of which fell to less than 60 pg/ml by six hours. All treatments caused maximal ER suppression by six hours; however, the implants caused a greater reduction in ER levels than either of the physiological doses. The reduction of ER levels was due primarily to a decrease in the cytosolic receptor. Despite the decrease in ER, all doses caused a significant and equivalent increase in uterine weight at six hours, however, only the implanted animals maintained the maximal uterine weight gain through 24 hours. This maintenance of uterine weight appears to be correlated with a small but significant increase in the nuclear ER level over this same time period. Thus, while E2 can cause a short-term suppression of its receptor concentration with no effect on short-term uterine weight gain, uterine growth is positively correlated with the level of nuclear ER." @default.
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- W2019938322 date "1991-01-01" @default.
- W2019938322 modified "2023-10-17" @default.
- W2019938322 title "Short-Term Effects of Physiological and Pharmacological Doses of Estradiol on Estrogen Receptor and Uterine Growth" @default.
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- W2019938322 doi "https://doi.org/10.3109/10799899109064677" @default.
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