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IL-1 beta mediates leptin induction during inflammation

R Faggioni1, G Fantuzzi, J Fuller

  • 1Metabolism Section, Veterans Affairs Medical Center, University of California, San Francisco 94121, USA.

The American Journal of Physiology
|February 12, 1998
PubMed
Summary
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Interleukin-1 beta (IL-1 beta) is crucial for increasing leptin levels during inflammation. This study shows IL-1 beta, not IL-6, is essential for leptin expression in response to inflammatory stimuli like LPS.

Area of Science:

  • Immunology
  • Endocrinology
  • Inflammation Research

Background:

  • Interleukins (IL) mediate host responses to infection and inflammation.
  • Leptin, secreted by adipose tissue, regulates food intake.
  • Inflammatory mediators like lipopolysaccharide (LPS), tumor necrosis factor (TNF), and IL-1 can increase leptin levels.

Purpose of the Study:

  • To investigate the specific roles of IL-1 beta and IL-6 in regulating leptin expression during inflammatory conditions.
  • To determine whether IL-1 beta or IL-6 is essential for leptin induction by inflammatory stimuli.

Main Methods:

  • Utilized IL-1 beta-deficient (-/-) and IL-6 -/- mice models.
  • Induced systemic inflammation using intraperitoneal lipopolysaccharide (LPS) injection.
  • Induced local inflammation using subcutaneous turpentine injection.

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Main Results:

  • In wild-type mice, both LPS and turpentine significantly increased leptin mRNA and circulating leptin levels.
  • In IL-1 beta -/- mice, neither LPS nor turpentine administration resulted in increased leptin levels.
  • Turpentine injection increased leptin protein levels to comparable extents in both IL-6 +/+ and IL-6 -/- mice.

Conclusions:

  • IL-1 beta is indispensable for the induction of leptin expression in response to both systemic (LPS) and local (turpentine) inflammation in mice.
  • IL-6 does not play a critical role in the inflammatory induction of leptin, as demonstrated by experiments in IL-6 deficient mice.