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- W2009196411 abstract "The effect of epidermal growth factor (EGF) on inhibin production by rat granulosa cells has been investigated using a recently developed inhibin radioimmunoassay (RIA). Granulosa cells from intact immature diethylstilbestrol (DES)-treated rats were exposed to EGF (1-100 ng/ml) in the presence or absence of FSH for varying periods in vitro. An inhibitory effect of EGF on basal inhibin secretion was evident at day 2 of culture and was sustained over the subsequent 2 days. This action on basal inhibin secretion was dose-dependent, and maximal inhibition to 50% of control was observed at a dose of 100 ng EGF/ml at day 4. EGF also inhibited basal progesterone secretion in a similar manner. EGF caused a dose-dependent inhibition of FSH-stimulated inhibin secretion, with an ID50 (0.5 ng/ml, 0.08 nM) about one-eighth that in the absence of FSH. In addition, EGF also inhibited the stimulation of inhibin production by 8-Br-cAMP and prostaglandin E2. To exclude the possibility that EGF was toxic to the granulosa cells, several biochemical parameters related to cell growth were measured. EGF treatment did not alter cell number but slightly increased [3H]thymidine incorporation into cellular DNA. The effect of EGF on [35S]methionine incorporation into cellular protein was biphasic, being stimulatory at doses less than 10 ng/ml but inhibitory at 100 ng/ml. The present data have demonstrated a direct inhibitory effect of EGF on basal and FSH-stimulated inhibin production by granulosa cells suggesting an important regulatory role of this growth factor in the differentiation of ovarian function." @default.
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- W2009196411 date "1987-12-01" @default.
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- W2009196411 title "Direct inhibition of rat granulosa cell inhibin production by epidermal growth factor in vitro" @default.
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- W2009196411 doi "https://doi.org/10.1016/0303-7207(87)90159-6" @default.
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