Cited by 332Regulation of Appetite and ObesityHypothalamic control of reproductive hormonesAdipokines, Inflammation, and Metabolic Diseases

Differential Sensitivity to Central Leptin and Insulin in Male and Female Rats

Clegg, Deborah J., Riedy, Christine A., Smith, Kathleen A. Blake, Benoit, Stephen C., Woods, Stephen C.·2003·Diabetes

Abstract

The distribution of fat in the body differs between the male and female sexes and is associated with the relative secretion of the two “adiposity” hormones leptin and insulin. We now report that the brains of male and female rats are differentially sensitive to the catabolic actions of small doses of these two hormones. Leptin (1 or 3.5 μg/2 μl) or saline (2 μl) was administered into the third cerebral ventricle of age- and weight-matched male and female rats. Leptin significantly reduced food intake in female and male rats over 4 h; however, leptin reduced 24-h intake in female but not in male rats. When the same rats were administered insulin (1 or 4 mU/2 μl) or saline (2 μl), male but not female rats had a robust reduction in food intake over 24 h. Previous research demonstrates the melanocortins are a central mediator of the effects of both leptin and insulin. However, we found no sex differences in sensitivity to the melanocortin agonist MTII (0.01, 0.1, 0.3, and 1.0 nmol/2 μl). These results suggest that the sex differences in sensitivity to leptin and insulin at the doses that we injected occur upstream of the melanocortin receptors. Because insulin and leptin reflect different fat beds and are differentially distributed in the male and female sexes, the implication is that the male and female sexes regulate adiposity-relevant parameters differently.

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Crossref · 10.2337/diabetes.52.3.682

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Authors
Clegg, D. J., Riedy, C. A., Smith, K. A. B., Benoit, S. C., & Woods, S. C.
Affiliations
  • University of Cincinnati (US)
  • University of Washington (US)
Venue
Diabetes
Published
2003-03-01
Volume
52
Issue
3
Pages
682-687
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2007895806
Cited by
332
References
42
Citations by year
2026: 1 · 2025: 8 · 2024: 7 · 2023: 8 · 2022: 13 · 2021: 19 · 2020: 23 · 2019: 10 · 2018: 15 · 2017: 15 · 2016: 18 · 2015: 16 · 2014: 15 · 2013: 25 · 2012: 14
FWCI
5.72
Type
journal article
Language
en
Open access
closed
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Cincinnati
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK17844, DK54080, R01DK054080, P01DK056863, DK-56863)
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, insulin, sex differences, dietary intake, melanocortin peptides, melanotan II, melanocortin receptors, adiposity, rats
MeSH terms
alpha-MSH, Animals, Body Composition, Body Weight, Brain, Eating, Female, Injections, Intraventricular, Insulin, Male, Sex Characteristics, Receptors, Corticotropin, Rats, Long-Evans, Leptin, Receptors, Melanocortin, Rats

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