Lipoxin A4 regulates M1/M2 macrophage polarization via FPR2-IRF pathway

Area of Science:

• Immunology
• Molecular Biology
• Pharmacology

Background:

• Lipoxin A4 (LXA4) exhibits anti-inflammatory properties, but its precise molecular mechanisms remain unclear.
• Macrophage polarization into M1 (pro-inflammatory) and M2 (anti-inflammatory) phenotypes is crucial in immune responses.

Purpose of the Study:

• To investigate the role of LXA4 in modulating macrophage polarization.
• To elucidate the molecular pathways through which LXA4 influences M1/M2 polarization.

Main Methods:

• RAW264.7 macrophage cell line was treated with LXA4, lipopolysaccharides (LPS), and interleukin-4 (IL-4).
• Analysis of inflammatory and anti-inflammatory cytokine release (IL-1β, IL-6, TNF-α, IL-4, IL-10).
• Assessment of signaling pathway activation, including p-NF-κB p65, IRF5, and IRF4 via the FPR2 receptor.

Main Results:

• LXA4 inhibited LPS-induced M1 macrophage polarization, reducing pro-inflammatory cytokines and downregulating p-NF-κB p65 and IRF5 activity via the FPR2/IRF5 pathway.
• LXA4 promoted IL-4-induced M2 macrophage polarization by activating the FPR2/IRF4 signaling pathway.
• LXA4 effectively regulates M1/M2 macrophage polarization through the FPR2-IRF pathway.

Conclusions:

• LXA4 plays a significant role in regulating macrophage polarization.
• The FPR2-IRF pathway is a key molecular mechanism mediating LXA4's effects on M1 and M2 macrophages.
• LXA4 demonstrates potential as a therapeutic agent for inflammatory diseases by modulating macrophage phenotypes.