The Journal of Experimental Medicine
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Published online 18 April 2000.
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© The Rockefeller University Press, 0022-1007/2000/4/1413/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 8, April 17, 2000 1413-1422


Original Article

P-Selectin Glycoprotein Ligand 1 (PSGL-1) Is Expressed on Platelets and Can Mediate Platelet–Endothelial Interactions In Vivo

Paul S. Frenettea,c, Cécile V. Denisa, Linnea Weissc, Kerstin Jurke, Sangeetha Subbaraoa, Beate Kehrele, John H. Hartwigb, Dietmar Vestweberd, and Denisa D. Wagnera
a The Center for Blood Research, Department of Pathology,
b Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115
c Department of Medicine, Mount Sinai School of Medicine, New York, New York 10029
d Institute of Cell Biology, Zentrum für die Molekularbiologie der Entzündung,
e Department of Anaesthesiology and Intensive Care Medicine, University of Münster, D-48149 Münster, Germany

Correspondence to: Paul S. Frenette, Mount Sinai School of Medicine, Department of Medicine, One Gustave L. Levy Pl., Box 1079, New York, NY 10029. Tel:212-659-9693 Fax:212-849-2574 E-mail:paul.frenette{at}mssm.edu.

The platelet plays a pivotal role in maintaining vascular integrity. In a manner similar to leukocytes, platelets interact with selectins expressed on activated endothelium. P-selectin glycoprotein ligand 1 (PSGL-1) is the main P-selectin ligand expressed on leukocytes. Searching for platelet ligand(s), we used a P-selectin–immunoglobulin G (IgG) chimera to affinity purify surface-biotinylated proteins from platelet lysates. P-selectin–bound ligands were eluted with ethylenediaminetetraacetic acid. An ~210-kD biotinylated protein was isolated from both human neutrophil and platelet preparations. A band of the same size was also immunopurified from human platelets using a monoclonal anti–human PSGL-1 antibody and could be blotted with P-selectin–IgG. Under reducing conditions, both the predicted PSGL-1 ~210-kD dimer and the ~120-kD monomer were isolated from platelets. Comparative immunoelectron microscopy and Western blotting experiments suggested that platelet PSGL-1 expression is 25–100-fold lower than that of leukocytes. However, patients with chronic idiopathic thrombocytopenic purpura who harbor predominantly young platelets displayed greater expression, indicating that PSGL-1 expression may be decreased during platelet aging. By flow cytometry, thrombin-activated platelets from normal individuals exhibited greater expression than those unstimulated. An inhibitory anti–PSGL-1 antibody significantly reduced platelet rolling in mesenteric venules, as observed by intravital microscopy. Our results indicate that functional PSGL-1 is expressed on platelets, and suggest an additional mechanism by which selectins and their ligands participate in inflammatory and/or hemostatic responses.

Key Words: P-selectin, endothelium, hemostasis, inflammation, adhesion


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