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Lipoxin A4 attenuates adipose inflammation.

Emma Börgeson1, Fiona C McGillicuddy, Karen A Harford

  • 1UCD Diabetes Research Centre, UCD Conway Institute, School of Medicine and Medical Science, University College Dublin, Dublin, Ireland.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
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Lipoxin A4 (LXA4) reduces inflammation in aging adipose tissue, improving insulin sensitivity. This suggests LXA4 may be a novel therapeutic strategy for type 2 diabetes mellitus (T2DM).

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Area of Science:

  • Metabolism
  • Immunology
  • Endocrinology

Background:

  • Aging and obesity are linked to chronic inflammation, contributing to type 2 diabetes mellitus (T2DM).
  • Adipose tissue inflammation, involving macrophages, impairs insulin sensitivity.
  • Lipid mediators like lipoxins can resolve inflammation.

Purpose of the Study:

  • To investigate the effect of lipoxin A4 (LXA4) on adipose tissue inflammation.
  • To determine if LXA4 can improve insulin sensitivity in the context of age-associated adipose inflammation.

Main Methods:

  • Used adipose tissue explants from aging female mice.
  • Treated explants and cultured adipocytes with LXA4.
  • Assessed cytokine expression (IL-6, IL-10, TNF-α), insulin signaling proteins (GLUT-4, IRS-1, Akt), and glucose uptake.

Main Results:

  • LXA4 (1 nM) decreased IL-6 and increased IL-10 expression in adipose tissue.
  • LXA4 treatment correlated with increased GLUT-4 and IRS-1 expression, indicating improved insulin sensitivity.
  • LXA4 rescued macrophage-induced insulin signaling desensitization and preserved Akt activation in adipocytes.

Conclusions:

  • LXA4 effectively attenuates adipose tissue inflammation and improves insulin sensitivity.
  • LXA4 demonstrates potential as a novel therapeutic agent to combat adipose inflammation and insulin resistance.
  • These findings suggest LXA4 could be a valuable strategy for managing T2DM.