Cited by 50Growth Hormone and Insulin-like Growth FactorsHypothalamic control of reproductive hormonesPituitary Gland Disorders and Treatments

E2 Supplementation Selectively Relieves GH’s Autonegative Feedback on GH-Releasing Peptide-2-Stimulated GH Secretion

Anderson, Stacey M., Wideman, Laurie, Patrie, James T., Weltman, Arthur, Bowers, Cyril Y., Veldhuis, Johannes D.·2001·The Journal of Clinical Endocrinology & Metabolism

Abstract

Female gender confers resistance to GH autonegative feedback in the adult rat, thereby suggesting gonadal or estrogenic modulation of autoregulation of the somatotropic axis. Here we test the clinical hypothesis that short-term E2 replacement in ovariprival women reduces GH's repression of spontaneous, GHRH-, and GH-releasing peptide (GHRP)-stimulated GH secretion. To this end, we appraised GH autoinhibition in nine healthy postmenopausal volunteers during a prospective, randomly ordered supplementation with placebo vs. E [1 mg micronized 17 beta-E2 orally twice daily for 6-23 d]. The GH autofeedback paradigm consisted of a 6-min pulsed i.v. infusion of recombinant human GH (10 microg/kg square-wave injection) or saline (control) followed by i.v. bolus GHRH (1 microg/kg), GHRP-2 (1 microg/kg), or saline 2 h later. Blood was sampled every 10 min and serum GH concentrations were measured by chemiluminescence. Poststimulus GH release was quantitated by multiparameter deconvolution analysis using published biexponential kinetics and by the incremental peak serum GH concentration response (maximal poststimulus value minus prepeak nadir). Outcomes were analyzed on the logarithmic scale by mixed-effects ANOVA at a multiple-comparison type I error rate of 0.05. E2 supplementation increased the (mean +/- SEM) serum E2 concentration from 43 +/- 1.8 (control) to 121 +/- 4 pg/ml (E2) (158 +/- 6.6 to 440 +/- 15 pmol/liter; P < 0.001), lowered the 0800 h (preinfusion) serum IGF-I concentra…

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Crossref · 10.1210/jcem.86.12.8076

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Authors
Anderson, S. M., Wideman, L., Patrie, J. T., Weltman, A., Bowers, C. Y., & Veldhuis, J. D.
Affiliations
  • University of Virginia Health System (US)
  • Health and Human Services (L.W., A.W.), Charlottesville, Virginia 22908
  • Tulane University (US)
  • University of Virginia (US)
Corresponding author
Anderson, Stacey M.
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2001-12-01
Volume
86
Issue
12
Pages
5904-5911
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2004341224
Cited by
50
References
72
Citations by year
2024: 1 · 2016: 2 · 2015: 1
FWCI
4.37
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging (R01-AG14799, R01AG014799)
  • National Center for Research Resources (M01RR000847, MO1-RR00847)
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, growth hormone-releasing hormone, postmenopausal women, estrogen replacement therapy, insulin-like growth factor I, somatotropic axis, recombinant human growth hormone
MeSH terms
Administration, Oral, Estradiol, Feedback, Female, Humans, Injections, Intravenous, Middle Aged, Oligopeptides, Prospective Studies, Recombinant Proteins, Growth Hormone-Releasing Hormone, Postmenopause, Human Growth Hormone

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