Cited by 236Growth Hormone and Insulin-like Growth FactorsHypothalamic control of reproductive hormonesPituitary Gland Disorders and Treatments

Regulatory mechanisms of growth hormone secretion are sexually dimorphic.

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Jaffe, C A, Ocampo-Lim, B, Guo, W, Krueger, K, Sugahara, I, DeMott-Friberg, R, Bermann, M, Barkan, A L·1998·Journal of Clinical Investigation

Abstract

Sexually dimorphic growth hormone (GH) secretory pattern is important in the determination of gender-specific patterns of growth and metabolism in rats. Whether GH secretion in humans is also sexually dimorphic and the neuroendocrine mechanisms governing this potential difference are not fully established. We have compared pulsatile GH secretion profiles in young men and women in the baseline state and during a continuous intravenous infusion of recombinant human insulin-like growth factor I (rhIGF-I). During the baseline study, men had large nocturnal GH pulses and relatively small pulses during the rest of the day. In contrast, women had more continuous GH secretion and more frequent GH pulses that were of more uniform size. The infusion of rhIGF-I (10 microg/kg/h) potently suppressed both spontaneous and growth hormone-releasing hormone (GHRH)-induced GH secretion in men. In women, however, rhIGF-I had less effect on pulsatile GH secretion and did not suppress the GH response to GHRH. These data demonstrate the existence of sexual dimorphism in the regulatory mechanisms involved in GH secretion in humans. The persistence of GH responses to GHRH in women suggests that negative feedback by IGF-I might be expressed, in part, through suppression of hypothalamic GHRH.

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Authors
Jaffe, C. A., Ocampo-Lim, B., Guo, W., Krueger, K., Sugahara, I., DeMott-Friberg, R., Bermann, M., & Barkan, A. L.
Affiliations
University of Michigan (US)
Venue
Journal of Clinical Investigation
Published
1998-07-01
Volume
102
Issue
1
Pages
153-164
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2073152302
Cited by
236
References
47
Citations by year
2026: 5 · 2025: 5 · 2024: 2 · 2023: 4 · 2022: 6 · 2021: 3 · 2020: 6 · 2019: 9 · 2018: 7 · 2017: 13 · 2016: 7 · 2015: 6 · 2014: 9 · 2013: 10 · 2012: 3
FWCI
7.38
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs
  • National Institutes of Health (5r01dk038449-09, RR0043, 5u54hd029184-03, P60DK20572)
  • Genentech
  • National Institute of Diabetes and Digestive and Kidney Diseases (R0-1 DK-38449)
  • National Center for Research Resources (MO1-RR0042-34S3, M01RR000042)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (U54 HD-29184)
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, sexual dimorphism, pulsatile secretion, insulin-like growth factor I, recombinant human IGF-I, growth hormone-releasing hormone, negative feedback, hypothalamus, sex differences
MeSH terms
Adult, Estradiol, Female, Humans, Insulin-Like Growth Factor I, Male, Recombinant Proteins, Sex Factors, Growth Hormone-Releasing Hormone, Testosterone, Thyrotropin, Insulin-Like Growth Factor Binding Proteins, Human Growth Hormone

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