Foxj2 Attenuates LPS-Induced Inflammatory Response in Macrophages

Area of Science:

• Immunology
• Molecular Biology
• Cell Biology

Background:

• Macrophages are key players in innate immunity, homeostasis, and inflammatory disease management.
• Forkhead box J2 (Foxj2) is a transcription factor vital for numerous biological functions.
• The specific role of Foxj2 in macrophage inflammatory responses remains largely unexplored.

Purpose of the Study:

• To investigate the function of Foxj2 in lipopolysaccharide (LPS)-activated macrophages.
• To elucidate the regulatory mechanisms involving Foxj2 in macrophage inflammation.

Main Methods:

• Assessed Foxj2 expression changes in macrophages upon LPS stimulation using RT-qPCR, Western blot, and immunofluorescence.
• Utilized adenovirus vectors for Foxj2 gene overexpression in macrophages.
• Determined the Foxj2-Tak1 regulatory relationship via luciferase reporter and ChIP-PCR assays.

Main Results:

• LPS stimulation significantly decreased Foxj2 expression in macrophages and various mouse tissues.
• Foxj2 overexpression suppressed LPS-induced mRNA expression of pro-inflammatory cytokines (TNF, IL-1β, IL-6, IL-12, ISG15, IFN-β).
• Foxj2 attenuated the phosphorylation of key inflammatory signaling pathways (Stat1, p65, Erk1/2, Jnk, p38) and inhibited Tak1 transcriptional activity.

Conclusions:

• Foxj2 plays a critical role in suppressing LPS-induced macrophage inflammation.
• Foxj2 acts by inhibiting Tak1 signaling pathways.
• Foxj2 represents a potential therapeutic target for sepsis and other inflammatory conditions.