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- W1965878817 endingPage "467" @default.
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- W1965878817 abstract "The effects of rat hypothalamic GH-releasing factor (GRF) and somatostatin (SRIF) on the release and biosynthesis of rat GH were studied by RIA and quantitative immunoprecipitation using monolayer cultures of rat anterior pituitary cells. In kinetic studies, GRF stimulation of GH release appeared at the first sampling time (20-min incubation) and the effect began to diminish after 2-h incubation with GRF. On the other hand, total (cell plus medium) content of GH significantly increased only after 24-h incubation. To examine the GHsynthesizing effect of GRF more directly, newly synthesized GH labeled by [35S]methionine during incubation with GRF was quantified by immunoprecipitation. The amount of immunoprecipitable GH increased significantly and specifically (compared with the total amount of labeled proteins) also only after 24-h incubation. When GH pools were labeled with [35S]methionine under different schedules, the basal release of newly synthesized GH, which was labeled for 1 h immediately before chase incubation was lower during the first 15 min than stored GH which had been labeled earlier. Basal newly synthesized GH secretion exceeded stored GH secretion after 30 min. GRF stimulated the release of GH from both pools but the stimulation of stored GH was greater. In this system, SRIF suppressed both the basal and stimulated release of GH but did not modify GH biosynthesis under either condition. Newly synthesized GH showed significant degradation during 24-h incubation; neither GRF nor SRIF affected the rate of GH degradation during the same incubation period. These results indicate that 1) GRF stimulates both release and synthesis of GH; 2) these two effects have different kinetics and different sensitivities to SRIF; and 3) GRF stimulates the release of GH from heterogeneous pools disproportionally. (Endocrinology117: 457–467,1985)" @default.
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- W1965878817 date "1985-08-01" @default.
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- W1965878817 title "Effects of Rat Growth Hormone (rGH)-Releasing Factor and Somatostatin on the Release and Synthesis of rGH in Dispersed Pituitary Cells*" @default.
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- W1965878817 doi "https://doi.org/10.1210/endo-117-2-457" @default.
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