Two defects contribute to hypothalamic leptin resistance in mice with diet-induced obesity
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Obesity in humans and in rodents is usually associated with high circulating leptin levels and leptin resistance. To examine the molecular basis for leptin resistance, we determined the ability of leptin to induce hypothalamic STAT3 (signal transducer and activator of transcription) signaling in C57BL/6J mice fed either low-fat or high-fat diets. In mice fed the low-fat diet, leptin activated STAT3 signaling when administered via the intraperitoneal (ip) or the intracerebroventricular (icv) route, with the half-maximal dose being 30-fold less when given by the icv route. The high-fat diet increased body-weight gain and plasma leptin levels. After 4 weeks on the diet, hypothalamic STAT3 signaling after ip leptin administration was equivalent in both diet groups. In contrast, peripherally administered leptin was completely unable to activate hypothalamic STAT3 signaling, as measured by gel shift assay after 15 weeks of high-fat diet. Despite the absence of detectable signaling after peripheral leptin at 15 weeks, the mice fed the high-fat diet retained the capacity to respond to icv leptin, although the magnitude of STAT3 activation was substantially reduced. These results suggest that leptin resistance induced by a high-fat diet evolves during the course of the diet and has at least two independent causes: an apparent defect in access to sites of action in the hypothalamus that markedly limits the ability of peripheral leptin to activate hypothalamic STAT signaling, and an intracellular signaling defect in leptin-responsive hypothalamic neurons that lies upstream of STAT3 activation.
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Obesity in humans and in rodents placed on a high-fat diet is characterized by hyperleptinemia, and the ability of leptin to suppress food intake and reduce body weight is attenuated.
“Obesity in both humans and in rodents placed on a HF diet are characterized by hyperleptinemia, and the ability of leptin to suppress food intake and reduce body weight is attenuated (49, 81).”
From Leptin and the Central Nervous System Control of Glucose Metabolism (2011) · cites this paper as [49]
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- Authors
- El-Haschimi, K., Pierroz, D. D., Hileman, S. M., Bjørbæk, C., & Flier, J. S.
- Affiliations
- Beth Israel Deaconess Medical Center (US)
- Corresponding author
- Flier, Jeffrey S.
- Venue
- Journal of Clinical Investigation
- Published
- 2000-06-15
- Volume
- 105
- Issue
- 12
- Pages
- 1827-1832
- ISSN
- 0021-9738 (ISSN-L)
- PMC
- PMC378516
- OpenAlex
- W2088666203
- Cited by
- 887
- References
- 29
- Citations by year
- 2026: 8 · 2025: 20 · 2024: 13 · 2023: 14 · 2022: 17 · 2021: 37 · 2020: 29 · 2019: 29 · 2018: 35 · 2017: 39 · 2016: 28 · 2015: 42 · 2014: 43 · 2013: 45 · 2012: 45
- FWCI
- 12.97
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Clinical Investigation (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Eli Lilly and Company
- Joslin Diabetes Center
- Deutsche Forschungsgemeinschaft
- National Institutes of Health
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
- Keywords
- leptin resistance, hypothalamus, STAT3 signaling, diet-induced obesity, high-fat diet, C57BL/6J mice
- MeSH terms
- Animals, Cerebral Ventricles, Dietary Fats, DNA-Binding Proteins, Drug Resistance, Humans, Hypothalamus, Injections, Intraventricular, Male, Mice, Inbred C57BL, Obesity, Trans-Activators, Diet, Fat-Restricted, Leptin, STAT3 Transcription Factor, Mice
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