RNF41 orchestrates macrophage-driven fibrosis resolution and hepatic regeneration

Area of Science:

• Immunology
• Hepatology
• Molecular Biology

Background:

• Hepatic inflammation drives chronic liver disease and cirrhosis.
• Macrophage activation predicts survival in cirrhosis patients.
• The role of Ring finger protein 41 (RNF41) in macrophage-mediated liver cirrhosis is unknown.

Purpose of the Study:

• Investigate RNF41's role in macrophage function during hepatic fibrosis and repair.
• Determine the therapeutic potential of modulating macrophage RNF41 in liver disease.

Main Methods:

• Analyzed RNF41 expression in macrophages from fibrotic/cirrhotic mouse and human livers.
• Utilized macrophage-selective gene therapy with dendrimer-graphite nanoparticles (DGNPs) to restore or deplete RNF41.
• Assessed liver fibrosis, injury, regeneration, and survival in mouse models.

Main Results:

• RNF41 expression was down-regulated in macrophages in fibrotic and cirrhotic livers, decreasing with TNF-α exposure.
• RNF41 restoration via DGNPs ameliorated liver fibrosis, reduced injury, and promoted regeneration, mediated by insulin-like growth factor 1.
• RNF41 depletion exacerbated liver inflammation, fibrosis, damage, and reduced survival.

Conclusions:

• Macrophage RNF41 is critical for controlling hepatic inflammation, fibrosis, and regeneration.
• Targeting macrophage RNF41 presents a potential therapeutic strategy for chronic liver disease and inflammatory fibrotic conditions.