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- W2000485456 abstract "Using an explant culture system, we have demonstrated that human somatotropes respond to growth hormone releasing factor (GRF) and somatostatin (SRIF) from as early as 9.5 weeks of fetal age. Responsiveness to GRF increases significantly as a function of age up to midgestation while SRIF inhibition of basal growth hormone (GH) release does not change. SRIF has little effect on GRF-stimulated GH secretion from early gestation pituitaries, but its ability to block GRF stimulation gradually increases with fetal age from 9.5 to 16 weeks. The response to GRF remains predominant throughout this developmental period: 100 times more SRIF than GRF must be added to the cultures in order to block the GRF stimulatory effect and maintain GH secretion at basal (control) levels. Finally, adding SRIF 30 min prior to the GRF does not increase the inhibitory activity of SRIF. Our data suggest that the mechanisms that permit an interaction between GRF and SRIF are developing, but slowly, in the early to midgestation human fetal somatotrope and that GRF stimulatory pathways predominate. This may help to explain the very high levels of GH in fetal serum during the first half of gestation." @default.
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- W2000485456 date "1987-01-01" @default.
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- W2000485456 title "Regulation of growth hormone secretion from human fetal pituitaries : interactions between growth hormone releasing factor and somatostatin" @default.
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- W2000485456 doi "https://doi.org/10.1051/rnd:19870402" @default.
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