Differential regulation of metabolic, neuroendocrine, and immune function by leptin in humans.
Abstract
To elucidate whether the role of leptin in regulating neuroendocrine and immune function during short-term starvation in healthy humans is permissive, i.e., occurs only when circulating leptin levels are below a critical threshold level, we studied seven normal-weight women during a normoleptinemic-fed state and two states of relative hypoleptinemia induced by 72-h fasting during which we administered either placebo or recombinant methionyl human leptin (r-metHuLeptin) in replacement doses. Fasting for 72 h decreased leptin levels by ≈80% from a midphysiologic (14.7 ± 2.6 ng/ml) to a low-physiologic (2.8 ± 0.3 ng/ml) level. Administration of r-metHuLeptin during fasting fully restored leptin to physiologic levels (28.8 ± 2.0 ng/ml) and reversed the fasting-associated decrease in overnight luteinizing hormone pulse frequency but had no effect on fasting-induced changes in thyroid-stimulating hormone pulsatility, thyroid and IGF-1 hormone levels, hypothalamic–pituitary–adrenal and renin–aldosterone activity. FSH and sex steroid levels were not altered. Short-term reduction of leptin levels decreased the number of circulating cells of the adaptive immune response, but r-metHuLeptin did not have major effects on their number or in vitro function. Thus, changes of leptin levels within the physiologic range have no major physiologic effects in leptin-replete humans. Studies involving more severe and/or chronic leptin deficiency are needed to precisely define the lower limit of normal leptin levels for each of leptin’s physiologic targets.
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Leptin concentrations are positively correlated with the amount of body fat.
“Leptin concentrations are positively correlated with the amount of body fat (4-10).”
From Leptin in humans: lessons from translational research (2009) · cites this paper as [7]
A significant role of leptin in the regulation of the hypothalamic-pituitary-thyroid axis has been well established in humans.
“A significant role of leptin in the regulation of the hypothalamicpituitary-thyroid axis has been well established in humans (6)(7)(8).”
From Leptin in humans: lessons from translational research (2009) · cites this paper as [7]
In states of secondary failure of the HPG axis associated with loss of fat mass, such as exercise-induced amenorrhea or anorexia nervosa, exogenously administered leptin may fully normalize function of this axis.
“Moreover, in states of secondary failure of the HPG axis associated with loss of fat mass, such as in exercise-induced amenorrhea or anorexia nervosa, exogenously administered leptin may fully normalize function of this axis (5,7,9,17).”
From Leptin in humans: lessons from translational research (2009) · cites this paper as [7]
The role of leptin in regulating immune function appears to be permissive.
“The role of leptin in regulating immune function appears to be a permissive one (33), because there might exist a critical leptin threshold above which leptin has no major additional physiologic effect on neuroendocrine or immune function (7).”
From Leptin in humans: lessons from translational research (2009) · cites this paper as [7]
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- Authors
- Chan, J. L., Matarese, G., Shetty, G. K., Raciti, P., Kelesidis, I., Aufiero, D., De Rosa, V., Perna, F., Fontana, S., & Mantzoros, C. S.
- Affiliations
- Beth Israel Deaconess Medical Center (US)
- Institute for Experimental Endocrinology and Oncology (IT)
- Institute of Molecular Biology and Pathology (IT)
- Gruppo di ImmunoEndocrinologia, Istituto di Endocrinologia e Oncologia Sperimentale, Consiglio Nazionale delle Ricerche (IEOS–CNR), 80131 Naples, Italy; and
- University of Naples Federico II (IT)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2006-05-30
- Volume
- 103
- Issue
- 22
- Pages
- 8481-8486
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W1977283476
- Semantic Scholar
- ffeb3c2fce9d0e978679b013e3b2d8974a550768
- Cited by
- 213
- References
- 34
- Citations by year
- 2026: 3 · 2025: 6 · 2024: 7 · 2023: 6 · 2022: 6 · 2021: 7 · 2020: 6 · 2019: 7 · 2018: 5 · 2017: 11 · 2016: 5 · 2015: 9 · 2014: 18 · 2013: 8 · 2012: 10
- FWCI
- 9.74
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Amgen
- Fondazione Italiana Sclerosi Multipla
- Deutsches Krebsforschungszentrum
- National Institutes of Health
- U.S. Public Health Service (R0-158785)
- National Center for Research Resources (RR 01032, M01RR001032, K23RR018860)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Keywords
- leptin, hypoleptinemia, fasting, recombinant human leptin, luteinizing hormone pulsatility, thyroid-stimulating hormone, hypothalamic-pituitary-adrenal axis, renin-aldosterone system, immune function, insulin-like growth factor I, sex steroids, metabolic regulation, neuroendocrine regulation
- MeSH terms
- Adaptation, Physiological, Adipose Tissue, Adult, Body Weight, Cells, Cultured, Fasting, Female, Hormones, Humans, Immunity, Immunity, Innate, Insulin-Like Growth Factor I, Leukocyte Count, Neurosecretory Systems, T-Lymphocytes, Time Factors, Leptin, Body Fat Distribution
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