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P-selectin mediates the adhesion of leukocytes to activated platelets and endothelial cells. To characterize the functional domains of P-selectin for ligand recognition, we established nine hybridoma cell lines secreting anti-rat P-selectin mAb. Among them, the mAb C215 bound both rat and human P-selectins, and inhibited binding of rat and human P-selectins to P-selectin glycoprotein ligand-1 (PSGL-1) from HL-60 cells. In contrast, mAb C215 failed to inhibit the binding of rat and human P-selectin-IgG to sialyl Lewis X (sLe(x)) oligosaccharides. Epitope mapping of mAb C215 using synthetic decapeptides revealed that mAb C215 binds specifically to an eight-residue epitope that spans amino acids 76-83 of rat P-selectin, a region completely conserved by human P-selectin. Synthetic peptides containing the mAb C215 epitope inhibited binding of P-selectin to PSGL-1, but not to sLe(x) oligosaccharides, suggesting that the C215 epitope on P-selectin may directly interact with a particular site on the PSGL-1 core protein essential for interaction with P-selectin, such as sulfated tyrosine residues. Our results suggest the presence of two ligand recognition sites on P-selectin necessary for binding to PSGL-1--one recognizes sLe(x), while the other recognises the PSGL-1 core protein.

A functional epitope on P-selectin that supports binding of P-selectin to P-selectin glycoprotein ligand-1 but not to sialyl Lewis X oligosaccharides