AZGP1 Aggravates Macrophage M1 Polarization and Pyroptosis in Periodontitis

Area of Science:

• Immunology
• Endocrinology
• Periodontology

Background:

• Periodontitis involves host inflammatory response and macrophage activity.
• Type 2 diabetes mellitus (T2DM) exacerbates periodontitis pathogenesis.
• The role of Alpha-2-glycoprotein 1 (AZGP1) in periodontitis is unclear.

Purpose of the Study:

• To investigate the role of AZGP1 in periodontitis, particularly in T2DM.
• To elucidate the mechanism by which AZGP1 influences macrophage polarization and inflammation.
• To assess the therapeutic potential of targeting the AZGP1-NLRP3 pathway.

Main Methods:

• AZGP1 expression analysis in periodontitis tissues.
• Murine models of periodontitis and T2DM-associated periodontitis with AZGP1 manipulation.
• In vitro studies using bone marrow-derived macrophages and human periodontal ligament stem cells (hPDLSCs).
• Inhibition of NLRP3 or caspase-1 pathways.

Main Results:

• AZGP1 expression is elevated in periodontitis, further increased in T2DM-associated periodontitis.
• AZGP1 overexpression enhances M1 macrophage polarization, pyroptosis, and alveolar bone loss.
• AZGP1 deficiency protects against periodontitis progression.
• AZGP1 promotes M1 polarization and pyroptosis via the NLRP3/caspase-1 pathway.
• AZGP1-induced macrophage inflammation impairs hPDLSC osteogenic differentiation.
• NLRP3 or caspase-1 inhibition rescues AZGP1-induced detrimental effects.

Conclusions:

• AZGP1 aggravates periodontitis by promoting M1 macrophage polarization and pyroptosis through the NLRP3/caspase-1 pathway.
• The detrimental effects of AZGP1 on periodontal inflammation are accentuated in T2DM.
• AZGP1 represents a critical link between diabetes and periodontal inflammation.
• AZGP1 is a potential therapeutic target for periodontitis, especially in diabetic patients.