P-selectin (CD62P) belongs to the selectin family of cell adhesion molecules, which includes E-selectin (CD62E) and L-selectin (CD62L). It contains a NH
2-terminal domain of -120 amino acid residues homologous to Ca
2+-dependent animal lectins and functions as an inducible receptor on activated platelets and endothelial cells for most leukocytes. The high-affinity human leukocyte ligand for P-selectin is a dimeric transmembrane sialomucin, called PSGL-1 (P-selectin Glycoprotein Ligand-1). As this molecule also serves as a ligand for E-selectin, we refer to it as P/ESGL-1 (P- and E-selectin Glycoprotein Ligand-1). There is an increasing body of evidence from work both
in vitro and
in vivo to support an important physiological and pathological role for P-selectin in mediating adhesion of leukocytes to endothelial cells and platelets in inflammation.
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