Anti-S100A9 Antibody, clone 6B4 clone 6B4, from mouse

Protein S100-A9 (UniProt P06702; also known as Calgranulin-B, Calprotectin L1H subunit, Leukocyte L1 complex heavy chain, Migration inhibitory factor-related protein 14, MRP-14, p14, S100 calcium-binding protein A9, S100A9) is encoded by the S100A9 (also known as 60B8AG, CAGB, CFAG, CGLB, L1AG, LIAG, MAC387, MRP14) gene (Gene ID 6280) in human. S100A9 is one of the 21 members of the S100 family of proteins. S100A8 (calgranulin-A), S100A9 (calgranulin-B) and the heterdimer S100A8/S100A9 (calprotectin) exert their immunological and inflammatory action via binding to TLR-4, RAGE and some other putative receptors. S100A8, calprotectin, and S100A9 are chemoattractants for neutrophils, and S100A9 is known to induce the expression and activation of beta2-integrins. S100A9 is also shown to stimulate neutrophil degranulation and phagocytosis, while both S100A8 and S100A9 can induce the secretion of inflammatory cytokines from human monocytes. In addition, S100A9 is shown to potentiate both fMLP- and GM-CSF-stimulated IL-8 production from neutrophils, although S100A9 on its own cannot induce neutrophil cytokine production in the absence of fMLP and GM-CSF.