Augmented growth hormone (GH) secretory burst frequency and amplitude mediate enhanced GH secretion during a two-day fast in normal men
Abstract
Serum GH concentrations are increased in fasted or malnourished human subjects. We investigated the dynamic mechanisms underlying this phenomenon in nine normal men by analyzing serum GH concentrations measured in blood obtained at 5-min intervals over 24 h on a control (fed) day and on the second day of a fast with a multiple-parameter deconvolution method to simultaneously resolve endogenous GH secretory and clearance rates. Two days of fasting induced a 5-fold increase in the 24-h endogenous GH production rate [78 +/- 12 vs. 371 +/- 57 micrograms/Lv (Lv, liter of distribution volume) or 0.24 +/- 0.038 vs. 1.1 +/- 0.16 mg/m2 (assuming a distribution volume of 7.9% body weight), P = 0.0001]. This enhanced GH production rate was accounted for by 2-fold increases in the number of GH secretory bursts per 24 h (14 +/- 2.3 vs. 32 +/- 2.4, P = 0.0006) and the mass of GH secreted per burst (6.3 +/- 1.2 vs. 11 +/- 1.6 micrograms/Lv, P = 0.002). The latter was a result of increased secretory-event amplitudes (maximal rates of GH release attained within a burst) with unchanged secretory burst durations. GH was secreted in complex volleys composed of multiple discrete secretory bursts. These secretory volleys were separated by shorter intervals of secretory quiescence in the fasted than fed state (respectively, 88 +/- 4.2 vs. 143 +/- 14 min, P = 0.0001). Similarly, within volleys of GH release, constituent individual secretory bursts occurred more frequently during the fast [every 33 +/- 0.64 (fasted) vs. every 44 +/- 2.0 min (fed), P = 0.0001]. The t1/2 of endogenous GH was not significantly altered by fasting [18 +/- 2.2 (fasted) vs. 20 +/- 1.5 min (fed), P = 0.47]. Serum insulin-like growth factor I concentrations were unchanged after 56 h of fasting. In conclusion, the present data suggest that starvation-induced enhancement of GH secretion is mediated by an increased frequency of GHRH release, and longer and more pronounced periods of somatostatin withdrawal.
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During early starvation, serum GH levels rise, and pulsatile GH secretion increases with increased pulse frequency and 24-hour integrated GH concentrations.
“During early starvation, serum GH levels rise, and pulsatile GH secretion increases with increased pulse frequency and 24-hour integrated GH concentrations (43, 44).”
From The role of falling leptin levels in the neuroendocrine and metabolic adaptation to short-term starvation in healthy men (2003) · cites this paper as [44]
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- Authors
- Hartman, M. L.
- Affiliations
- University of Virginia (US)
- Corresponding author
- Mark L. Hartman
- ORCID
- Mark L. Hartman
- Venue
- The Journal of Clinical Endocrinology & Metabolism
- Publisher
- The Endocrine Society
- Published
- 1992-04-01
- Volume
- 74
- Issue
- 4
- Pages
- 757-765
- ISSN
- 0021-972X (ISSN-L)
- 1945-7197
- OpenAlex
- W1969576589
- Cited by
- 296
- References
- 0
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 7 · 2023: 7 · 2022: 3 · 2021: 5 · 2020: 4 · 2019: 4 · 2018: 5 · 2017: 2 · 2016: 5 · 2015: 9 · 2014: 4 · 2013: 4 · 2012: 1
- FWCI
- 11.67
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
- PubMed (publishedVersion)
- The Journal of the American Medical Association (JAMA) Network (American Medical Association) (submittedVersion)
- Funders
- National Institutes of Health (5k04hd000634-02, 5k08hd000860-03)
- National Center for Research Resources (RR 00847, M01RR000847)
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (1-K08-HD-00860, 1-K04-HD-00634)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
- Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Pituitary Gland Disorders and Treatments
- Keywords
- growth hormone secretion, fasting, insulin-like growth factor I, starvation, deconvolution, normal men
- MeSH terms
- Adult, Estradiol, Fasting, Humans, Hydrocortisone, Insulin-Like Growth Factor I, Male, Metabolic Clearance Rate, Radioimmunoassay, Growth Hormone, Testosterone, Time Factors, Body Mass Index
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