|Chemotaxis Induced by Complement Component C5a and Neutralization by Human Complement Component C5a Antibody. Recombinant Human Complement Component C5a (Catalog # 2037-C5) chemoattracts the J774A.1 mouse reticulum cell sarcoma macrophage cell line in a dose-dependent manner (orange line). The amount of cells that migrated through to the lower chemotaxis chamber was measured by Resazurin (Catalog # AR002). Chemotaxis elicited by Recombinant Human Complement Component C5a (15 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human Complement Component C5a Antigen Affinity-purified Polyclonal Antibody (Catalog # AF2037). The ND50 is typically 0.075-0.4 µg/mL.|
Human complement 5a (C5a) is an enzymatically generated glycoprotein that belongs to a family of structurally and functionally related proteins known as anaphylatoxins. C5a is a 74 amino acid (aa) peptide that is created by the activity of C5a convertase on the C5 alpha -chain (1, 2). Human C5a has four alpha -helices plus three intrachain disulfide bonds that create a triple loop structure (3). In serum, proteolytic processing removes the C-terminal arginine, creating a low activity C5adesArg74 molecule (1). Human C5a is 60% and 54% aa identical to mouse and rat C5a, respectively. C5a binds to a signaling G-protein coupled receptor (C5aR/CD88) and a nonsignaling GPCR termed C5L2 (4). Activation of Cd88 results in neutrophil chemotaxis and endothelial cell activation (1, 5). It also triggers an oxidative burst in macrophages and neutrophils, and induces release of histamine in basophils and mast cells.
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