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Lipoxin A4 inhibits UV radiation-induced skin inflammation and oxidative stress in mice

R M Martinez1, V Fattori2, P Saito1

  • 1Departamento de Ciências Farmacêuticas, Universidade Estadual de Londrina-UEL, Hospital Universitário, Avenida Robert Koch, 60, 86038-350 Londrina, Paraná, Brasil.

Journal of Dermatological Science
|May 8, 2018
PubMed
Abstract

Insights

Lipoxin A4 (LXA4) effectively reduces skin inflammation and oxidative damage caused by UV radiation. This study shows LXA4 administration protects the skin by reducing inflammatory markers and oxidative stress.

Area of Science:

  • Dermatology
  • Immunology
  • Molecular Biology

Background:

  • Lipoxin A4 (LXA4) is a key lipid mediator with known anti-inflammatory and pro-resolution properties.
  • Its role in mitigating ultraviolet (UV) radiation-induced skin inflammation and damage remains largely unexplored.

Purpose of the Study:

  • To investigate the therapeutic potential of systemically administered LXA4 against UV radiation-induced skin inflammation and oxidative stress in a mouse model.
  • To elucidate the underlying molecular mechanisms of LXA4's protective effects.

Main Methods:

  • Mice were subjected to UV radiation, and varied parameters of skin inflammation and oxidative stress were assessed.
  • Lipoxin A4 (LXA4) was administered systemically at different time points prior to UV exposure.
  • Analysis included histological examination, cytokine profiling, oxidative stress marker assessment, and gene expression analysis.

Main Results:

  • LXA4 pretreatment significantly reduced UV-induced skin edema, neutrophil infiltration, and matrix metalloproteinase-9 (MMP-9) activity.
  • LXA4 attenuated increases in pro-inflammatory cytokines (TNF-α, IL-1β, IL-6, IL-33) and enhanced anti-inflammatory cytokines (TGF-β, IL-10).
  • LXA4 significantly counteracted UV-induced oxidative damage, restoring key antioxidant parameters and modulating the expression of NADPH oxidase 2 (NOX2) and Nrf2 pathway genes.

Conclusions:

  • Systemic LXA4 administration effectively inhibits UV radiation-induced skin inflammation and oxidative stress.
  • LXA4 exerts its protective effects by suppressing pro-inflammatory cytokine production, reducing oxidative damage, and activating the Nrf2 antioxidant pathway.
Keywords:
Lipid mediatorOxidative stressResolution of inflammationSkin damageUltraviolet radiation

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