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Sexual dimorphism in plasma leptin concentration

M F Saad1, S Damani, R L Gingerich

  • 1Department of Medicine, University of Southern California Medical School, Los Angeles 90033, USA.

The Journal of Clinical Endocrinology and Metabolism
|February 1, 1997
PubMed
Summary

Gender significantly impacts leptin levels, with women exhibiting higher concentrations than men, independent of body fat. This sexual dimorphism suggests potential differences in leptin

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Area of Science:

  • Endocrinology
  • Human Physiology
  • Metabolic Research

Background:

  • Leptin, a hormone produced by the obese (ob) gene, is crucial for regulating body weight by influencing feeding behavior and energy expenditure.
  • Understanding the factors determining plasma leptin concentration is essential for comprehending its role in metabolic health.

Purpose of the Study:

  • To investigate the determinants of plasma leptin concentration in individuals with varying glucose tolerance.
  • To explore the influence of adiposity, gender, age, and insulinemia on leptin levels.

Main Methods:

  • Cross-sectional study involving 267 subjects with normal glucose tolerance, impaired glucose tolerance, and non-insulin-dependent diabetes.
  • Fasting plasma leptin levels were measured.
  • Multiple regression analysis was used to identify significant determinants of leptin concentration.

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Main Results:

  • Plasma leptin levels were higher in obese subjects and not related to glucose tolerance.
  • Women exhibited approximately 40% higher leptin levels than men, irrespective of adiposity.
  • Adiposity, gender, and insulinemia were significant determinants of leptin concentration, explaining 42%, 28%, and 2% of its variance, respectively.

Conclusions:

  • Gender is a major determinant of plasma leptin concentration.
  • The observed sexual dimorphism in leptin levels is not explained by sex hormones or body fat distribution.
  • Women's higher leptin levels may indicate resistance to its lipostatic actions and suggest a potential reproductive function.