TNIP3 Attenuates Colitis by Inhibiting the TAB1/NF-κB/NLRP3 Signaling Pathway in Macrophages

Area of Science:

• Gastroenterology
• Immunology
• Molecular Biology

Background:

• Inflammatory bowel disease (IBD) involves chronic intestinal inflammation.
• Understanding mechanisms of macrophage polarization and epithelial barrier function is crucial for IBD treatment.

Purpose of the Study:

• To investigate the role of TNIP3 (TNFAIP3-interacting protein 3) in modulating macrophage polarization and intestinal epithelial barrier function in IBD.
• To elucidate the therapeutic potential of TNIP3 in IBD.

Main Methods:

• Utilized LPS-induced RAW 264.7 cells and DSS-induced mouse models for IBD research.
• Assessed macrophage polarization via flow cytometry, ELISA, and Western blotting.
• Evaluated intestinal epithelial barrier function using TEER and FITC-dextran permeability assays, and analyzed NF-κB activation.

Main Results:

• TNIP3 overexpression suppressed M1 macrophage polarization and inhibited NF-κB and NLRP3 inflammasome activation.
• TNIP3 enhanced intestinal epithelial barrier function in a coculture system and alleviated DSS-induced intestinal damage.
• TAB1 overexpression reversed the protective effects of TNIP3 in IBD models.

Conclusions:

• TNIP3 attenuates inflammatory responses by inhibiting M1 macrophage polarization via the TAB1/NF-κB/NLRP3 pathway.
• TNIP3 enhances intestinal epithelial barrier function, suggesting its potential as a therapeutic target for IBD.