Cited by 435Regulation of Appetite and ObesityLipid metabolism and biosynthesisAdipokines, Inflammation, and Metabolic Diseases

Regulation of fatty acid homeostasis in cells: Novel role of leptin

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Unger, Roger H., Zhou, Yan-Ting, Orci, Lelio·1999·Proceedings of the National Academy of Sciences

Abstract

It is proposed that an important function of leptin is to confine the storage of triglycerides (TG) to the adipocytes, while limiting TG storage in nonadipocytes, thus protecting them from lipotoxicity. The fact that TG content in nonadipocytes normally remains within a narrow range, while that of adipocytes varies enormously with food intake, is consistent with a system of TG homeostasis in normal nonadipocytes. The facts that when leptin receptors are dysfunctional, TG content in nonadipocytes such as islets can increase 100-fold, and that constitutively expressed ectopic hyperleptinemia depletes TG, suggest that leptin controls the homeostatic system for intracellular TG. The fact that the function and viability of nonadipocytes is compromised when their TG content rises above or falls below the normal range suggests that normal homeostasis of their intracellular TG is critical for optimal function and to prevent lipoapoptosis. Thus far, lipotoxic diabetes of fa/fa Zucker diabetic fatty rats is the only proven lipodegenerative disease, but the possibility of lipotoxic disease of skeletal and/or cardiac muscle may require investigation, as does the possible influence of the intracellular TG content on autoimmune and neoplastic processes.

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Crossref · 10.1073/pnas.96.5.2327

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49 of 49 references verified0 citation errors · 0 not checkable

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  • Taken together, the data suggest that the intrahepatic and intramyocellular lipid lowering effects of leptin were mediated mostly by a reduction in energy intake, as opposed to a leptin-induced increase in energy expenditure, although a lipolytic effect of leptin on these tissues cannot be ruled out.

    “Taken together, these data suggest that intrahepatic and intramyocellular lipid lowering effects of leptin were mediated mostly by a reduction in energy intake, as opposed to a leptininduced increase in energy expenditure, although a lipolytic effect of leptin on these tissues cannot be ruled out (4, 28).”

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Authors
Unger, R. H., Zhou, Y.-T., & Orci, L.
Affiliations
University of Geneva (CH)
Venue
Proceedings of the National Academy of Sciences
Published
1999-03-02
Volume
96
Issue
5
Pages
2327-2332
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2024936045
Cited by
435
References
49
Citations by year
2026: 4 · 2025: 2 · 2024: 6 · 2023: 17 · 2022: 8 · 2021: 3 · 2020: 8 · 2019: 4 · 2018: 4 · 2017: 5 · 2016: 4 · 2015: 10 · 2014: 21 · 2013: 10 · 2012: 15
FWCI
14.13
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation
  • U.S. Department of Veterans Affairs (SMI 821-109)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • Novo Nordisk
  • National Institutes of Health (DK02700-37)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK0270037, K08DK002700, R01DK002700)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
leptin, fatty acid homeostasis, triglyceride homeostasis, lipotoxicity, lipoapoptosis, adipocytes, pancreatic islets, Zucker diabetic fatty rats, skeletal muscle, myocardium, adipose tissue
MeSH terms
Aged, Animals, Energy Intake, Cell Transformation, Neoplastic, Diabetes Mellitus, Diabetes Mellitus, Type 1, Fatty Acids, Fatty Acids, Nonesterified, Homeostasis, Humans, Islets of Langerhans, Liver Diseases, Models, Biological, Obesity, Proteins, Rats, Zucker, Risk Factors, Triglycerides, Colorectal Neoplasms, Adipocytes, Leptin, Rats

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