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Anti-inflammatory actions of lipoxin A4 and aspirin-triggered lipoxin are SOCS-2 dependent

Fabiana S Machado1, James E Johndrow, Lisia Esper

  • 1Department of Immunology, Duke University Medical Center, Durham, North Carolina 27705, USA.

Nature Medicine
|January 18, 2006
PubMed

Insights

Lipoxins regulate inflammation by activating AhR and LXAR receptors in dendritic cells, inducing suppressor of cytokine signaling-2 (SOCS-2). SOCS-2 deficiency leads to uncontrolled inflammation and increased mortality during infection.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Inflammation control is vital for host defense during infection.
  • Lipoxins and aspirin-triggered lipoxins modulate inflammatory responses, but their intracellular mechanisms require further elucidation.
  • Previous work demonstrated lipoxin A4 (LXA4) regulates dendritic cell (DC) migration and IL-12 production.

Purpose of the Study:

  • To investigate the intracellular mechanisms of lipoxin action in dendritic cells.
  • To identify key mediators involved in lipoxin-induced anti-inflammatory effects.

Main Methods:

  • Activation of aryl hydrocarbon receptor (AhR) and liver X receptor alpha (LXAR) in DCs.
  • Analysis of suppressor of cytokine signaling-2 (SOCS-2) expression.
  • Assessment of DC responsiveness to microbial stimuli.
  • Infection models in SOCS-2 deficient mice.

Main Results:

  • Lipoxins activate AhR and LXAR in DCs, leading to SOCS-2 expression.
  • SOCS-2-deficient DCs exhibit hyper-responsiveness to microbial stimuli and are resistant to LXA4's inhibitory effects.
  • SOCS-2-deficient mice show uncontrolled inflammation, increased mortality, and aberrant leukocyte infiltration upon infection.
  • SOCS-2 is essential for the anti-inflammatory effects of aspirin-triggered lipoxins.

Conclusions:

  • SOCS-2 is a critical intracellular mediator of lipoxin's anti-inflammatory actions.
  • Targeting the lipoxin-AhR/LXAR-SOCS-2 pathway may offer therapeutic strategies for controlling inflammation during infection.

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