Abstract
Myeloperoxidase (MPO)-specific antineutrophil cytoplasmic antibody (ANCA) is associated with rapidly progressive glomerulonephritis (RPGN) in microscopic polyangiitis (MPA). MPO-ANCA activates neutrophils by binding to cell surface MPO expressed on tumor necrosis factor-α (TNF-α)-primed neutrophils and induces neutrophil degranulation and production of reactive oxygen species, consequently resulting in glomerular endothelial damage. Recently, anti-MPO antibody has been found to activate glomerular endothelial cells, leading to an upregulation of adhesion molecules. MPO-ANCA, however, is not always correlated with disease activity in MPA. Accordingly, the molecule(s) responsible for the anti-MPO antibody have been explored on mouse glomerular endothelial cells. The molecule was identified as moesin, which is a heparin-binding protein and belongs to the ezrin/radixin/moesin family of proteins distributed in the plasma membrane in the cellular cortex. Interestingly, anti-moesin is observed in sera of SCG/Kj mice, which spontaneously develop MPO-ANCA-associated RPGN, and of patients with MPO-AAV. The activation of glomerular endothelial cells by the anti-MPO antibody appears to be associated with signaling through moesin.
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Suzuki, K., Suzuki, K., Nagao, T. et al. Proposal of anti-moesin as a novel biomarker for ANCA-associated vasculitis. Clin Exp Nephrol 17, 638–641 (2013). https://doi.org/10.1007/s10157-013-0861-1
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DOI: https://doi.org/10.1007/s10157-013-0861-1