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- W2103307620 abstract "GH secretory patterns in humans are sexually dimorphic in terms of pulse regularity, amplitude of the diurnal rhythm, and magnitude of basal (trough) secretion. The neuroendocrine mechanisms of gender-specific GH regulation in humans are currently unknown, but the interpulse GH levels are generally assumed to be controlled by somatostatin. In rats, however, administration of antiserum to GHRH lowers GH interpulse levels in females but not males. In this study, using a competitive antagonist to GHRH in humans, we investigated whether endogenous GHRH has differential, gender-specific effects on the interpulse GH levels. Six healthy men and five healthy women (20-28 yr old) who were nonobese, did not smoke, and were on no medications known to influence GH secretion were studied. Each served as his or her own control during an infusion of GHRH antagonist or saline for a 27-h period. A control bolus of GHRH was given near the end of the infusion. In both sexes during GHRH antagonist infusion, mean GH, pulse amplitude, and GH response to GHRH decreased significantly, whereas pulse frequency remained unchanged. However, during the GHRH antagonist infusion, trough GH did not significantly change in men (P = 0.54) but significantly decreased in women (P = 0.008). Deconvolution analysis confirmed the lack of a significant change in basal secretion in men (P = 0.81) as opposed to women (P = 0.006). We conclude that sexual dimorphism in the neuroendocrine regulation of GH secretion in humans involves a differential role of endogenous GHRH in maintaining baseline GH." @default.
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- W2103307620 date "2003-10-01" @default.
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- W2103307620 title "Sexual Dimorphism of Growth Hormone (GH) Regulation in Humans: Endogenous GH-Releasing Hormone Maintains Basal GH in Women But Not in Men" @default.
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- W2103307620 doi "https://doi.org/10.1210/jc.2003-030246" @default.
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