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Related Experiment Videos

Serum leptin and lipids in patients with thyroid dysfunction.

M Matsubara1, T Yoshizawa, T Morioka

  • 1Division of Endocrinology and Metabolism, Internal Medicine, Otaru City General Hospital, Otaru, Japan.

Journal of Atherosclerosis and Thrombosis
|June 27, 2001
PubMed
Summary

Thyroid hormones do not significantly influence leptin levels in humans. Adiposity and gender are the primary factors affecting serum leptin concentration, not thyroid function.

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Area of Science:

  • Endocrinology
  • Metabolism

Background:

  • Leptin, a hormone produced by adipose tissue, plays a crucial role in regulating energy balance and appetite.
  • Thyroid hormones influence metabolic rate, and their potential impact on leptin secretion warrants investigation.

Purpose of the Study:

  • To investigate the relationship between thyroid hormone levels and serum leptin concentration in a Japanese population.
  • To determine if thyroid dysfunction (hyperthyroidism or hypothyroidism) affects leptin levels independently of body composition.

Main Methods:

  • Cross-sectional study involving 368 Japanese females and 60 male controls.
  • Serum leptin levels were measured and correlated with thyroid hormone status, body mass index (BMI), and body fat mass (BFM).
  • Comparisons were made between euthyroid controls and patients with hyperthyroidism and hypothyroidism.

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Main Results:

  • Serum leptin levels were significantly lower in males than females and correlated positively with BMI and BFM in both genders.
  • Pretreatment hyperthyroid females had lower leptin levels than hypothyroid or euthyroid females, but this difference was primarily attributed to lower BMI and BFM.
  • Serum leptin levels did not change significantly during treatment for hyperthyroidism or hypothyroidism and showed no correlation with thyroid hormones or lipid levels.

Conclusions:

  • Adiposity and gender are the main determinants of serum leptin concentration.
  • Thyroid hormones do not appear to play a significant role in the synthesis or secretion of leptin in humans.