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- W2023144730 abstract "Adult female transgenic mice expressing the human GH (hGH) gene with mouse metallothionein-I promoter are sterile. To evaluate the hypothalamic-pituitary function in these animals, adult female transgenic mice and nontransgenic normal littermates were ovariectomized. On days 7 and 8 after ovariectomy, mice were injected with either oil or primed with 0.5 micrograms estradiol benzoate (EB) in oil, 24 h later treated with 10 micrograms EB/100 g body wt and a day later bled for measurements of FSH, LH, and PRL levels. Plasma gonadotropin and PRL levels were also measured in ovary-intact transgenic and normal siblings at estrus. Additional ovariectomized EB-treated transgenic mice and normal siblings were injected with either saline or GnRH in saline (1 ng/g body wt) and were bled 15 min later for determination of circulating hormone levels. At estrus, in transgenic mice, circulating FSH and PRL levels were significantly lower (FSH:P less than 0.001; PRL:P less than 0.025), but plasma LH concentrations were higher (P less than 0.001) than those in nontransgenic mice. As expected, ovariectomy significantly increased (P less than 0.001) circulating FSH and LH levels in both groups of mice relative to ovary-intact animals, but the increase in plasma LH levels was attenuated in transgenic mice. The suppressive effect of estrogen on circulating FSH and LH levels were similar in transgenic and nontransgenic mice. Treatment with GnRH significantly increased plasma FSH and LH levels in both transgenic and normal mice. However, the plasma FSH and LH responses to GnRH administration were significantly reduced (P less than 0.001) in transgenic mice. The results of these studies indicate that adult female transgenic mice expressing the hGH gene are hypoprolactinemic. Yet due to PRL-like activity of hGH, the gonadotropin secretion is altered. Thus, endogenously secreted hGH modulates the hypothalamic-pituitary function of adult female transgenic mice bearing the hGH gene." @default.
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- W2023144730 date "1992-04-01" @default.
- W2023144730 modified "2023-09-25" @default.
- W2023144730 title "Neuroendocrine function in adult female transgenic mice expressing the human growth hormone gene." @default.
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- W2023144730 doi "https://doi.org/10.1210/endo.130.4.1547710" @default.
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