TWEAK promotes inflammatory response in liver fibrosis

Area of Science:

• Immunology
• Hepatology
• Cell Biology

Background:

• Liver fibrosis is a significant health concern.
• Kupffer cells (KCs) play a crucial role in liver inflammation and fibrosis.
• Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) is implicated in inflammatory processes.

Purpose of the Study:

• To investigate the role of TWEAK in liver fibrosis.
• To elucidate the mechanism by which TWEAK influences M1 polarization of liver macrophages.
• To evaluate TWEAK's impact on a mouse model of liver fibrosis.

Main Methods:

• Primary liver Kupffer cells (KCs) and J774A.1 macrophages were cultured and induced for M1 polarization.
• TWEAK was administered, followed by analysis of M1 cell proportion and cytokine levels.
• CD266 expression was silenced, and NLRP3 inflammasome was inhibited to assess their role.
• A mouse model of liver fibrosis was established to evaluate TWEAK's in vivo effects.

Main Results:

• TWEAK significantly promoted M1 polarization of KCs and J774A.1 cells.
• Silencing CD266 or inhibiting NLRP3 suppressed TWEAK-induced M1 polarization.
• In vivo studies showed that TWEAK exacerbated liver fibrosis, while NLRP3 inhibition improved liver function and reduced M1 cell levels.

Conclusions:

• TWEAK drives liver fibrosis by promoting M1 macrophage polarization.
• The TWEAK-mediated M1 polarization involves CD266 and the NLRP3 inflammasome.
• Targeting NLRP3 offers a potential therapeutic strategy to counteract TWEAK-induced liver fibrosis.