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- W2000909778 abstract "In the present study, we examined the effects of growth hormone releasing hormone (GHRH) on luteinizing hormone (LH)-stimulated progestin biosynthesis. Granulosa cells from pregnant mare serum gonadotropin (PMSG)-treated immature rats were cultured in vitro in the absence or presence of ovine. National Institute of Health LH (100 ng/ml) with various doses of GHRH (10(-9), 10(-8) and 10(-7) mol/l) for 24 h. At the end of the incubation period, the incubation media were collected and levels of progesterone, 20 alpha-hydroxypregn-4-en-3-one and cyclic adenosine 3',5'-monophosphate (cAMP) were measured. GHRH significantly stimulated progesterone production and cAMP accumulation in media in a dose-dependent manner in the basal state (p < 0.01 and p < 0.001, respectively). In the presence of LH, GHRH significantly inhibited LH-stimulated progesterone production in a dose-dependent manner (p < 0.01), whereas increasing concentrations of GHRH produced progressive increases in cAMP accumulation (p < 0.05). Since increasing concentrations of GHRH produced progressive decreases in the ratio of progesterone to 20 alpha-hydroxypregn-4-en-3-one production in the LH-stimulated state (p < 0.01), GHRH may be involved in modulation of key steroidogenic steps concerned with progesterone degradation rather than formation in LH-stimulated rat granulosa cells. These results suggest that GHRH may regulate the effects of LH in granulosa cells and play an important role in the reproductive process." @default.
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- W2000909778 date "1998-01-01" @default.
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- W2000909778 title "Effect of growth hormone releasing hormone on luteinizing hormone stimulated progestin biosynthesis in cultured rat ovarian granulosa cells" @default.
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- W2000909778 doi "https://doi.org/10.3109/09513599809012831" @default.
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