Clone REA389 recognizes the human CD62P antigen, a 140 kDa single-pass type I membrane protein also known as P-selectin or platelet activation dependent granule-external membrane protein (PADGEM). CD62P is expressed by vascular endothelial cells and platelets. The protein is stored preformed in the Weibel-Palade bodies of endothelial cells and in the α-granules of platelets. Upon stimulation of these cells with a variety of agonists such as thrombin or histamine, CD62P is rapidly translocated to the cell surface, where it mediates leukocyte-platelet and leukocyte-vascular endothelial cell adhesion. The interaction of CD62P with mature leukocytes is in part responsible for mediating leukocyte rolling on vascular cells – an early event in leukocyte recruitment at sites of inflammation. In addition to its role as a receptor for mature neutrophils and monocytes, CD62P also functions as a cell adhesion molecule for leukocyte precursor cells in the bone marrow, including both lineage-restricted clonogenic progenitors and hierarchically more primitive progenitor cells.

Additional information: Clone REA389 displays negligible binding to Fc receptors.