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• W2129302471 abstract "Several investigators have reported gastrin-releasing peptide (GRP)-like immunostaining in several regions of the rat brain. The objective of this study was to determine the possible effects of this peptide on GH release. Porcine GRP was injected intraventricularly (third ventricular) in a volume of 2 nl into ovariectomized female rats. A significant decrease in basal GH release, as evidenced by decreased plasma GH levels, was observed within 10 min which lasted for 90 min after the injection of 2 μg (0.7 nmol) GRP (P < 0.001). In addition, all GH pulses were abolished during this time. In subsequent experiments, varying doses of GRP were administered, and human pancreatic GH-releasing factor (GRF) was injected iv at a dose of 0.1 MgAg 20 min later to determine the responsiveness of the pituitary. The minimal effective dose of GRP to lower plasma GH was approximately 10 μg (3.6 pmol); however, the GHreleasing action of GRF was blocked by even the lowest dose of the peptide tested (5 ng; 1.8 pmol). To determine if GRP had any direct action on the pituitary, overnight-cultured pituitary cells from ovariectomized animals were incubated for 1 h with GRP in various concentrations. There was a slight dose-dependent stimulation of GH release with concentrations of GRP ranging from 10−9-10−6m; however, the GH-releasing action was much less than that of GRF. To confirm the direct stimulatory effect of GRP on GH release, dispersed pituitary cells were perifused with medium containing 2 × 10−6m GRP. An immediate increase in GH release was observed in the perfusate. Since GRP has a direct stimulatory action to release GH in the pituitary, but ivt injection of the peptide inhibits GH release and blocks the response to GRF, we suggest that GRP may act on periventricular structures to release somatostatin, which reduces GH release and blocks the response to GRF. (Endocrinology117: 1363–1367, 1985)" @default.
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• W2129302471 date "1985-10-01" @default.
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• W2129302471 title "The Effect of Gastrin-Releasing Peptide on Growth Hormone Secretion in the Rat*" @default.
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• W2129302471 doi "https://doi.org/10.1210/endo-117-4-1363" @default.
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