Thromb Haemost 2002; 87(04): 706-711
DOI: 10.1055/s-0037-1613069
Review Article
Schattauer GmbH

A 28-kDa Glycoprotein Functions as a Platelet Ligand for P-selectin (CD62P)[*]

Ling Li
2   Laboratory of Molecular Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
,
Kai-Xian Qian
1   School of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, China
,
Jian-Guo Geng
2   Laboratory of Molecular Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
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Publikationsverlauf

Received 07. Oktober 2001

Accepted after resubmission 14. Dezember 2001

Publikationsdatum:
27. Dezember 2017 (online)

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Summary

P-selectin (CD62P) is expressed on activated platelets and on stimulated endothelial cells. It interacts with P-selectin glycoprotein ligand-1 (PSGL-1; CD162) for adhesion of activated platelets on leukocytes and for rolling of leukocytes on stimulated endothelial cells. Recently, resting and activated platelets have been shown to roll on endothelial P-selectin, indicating that platelets express (a) ligand(s) for P-selectin. Here we show that P-selectin specifically precipitated one 28-kDa glycoprotein from the whole cell lysates and the membrane lysates of human platelets in a Ca2+-dependent manner. Further, the purified 28-kDa molecule could inhibit the binding of P-selectin to human resting and activated platelets. In contrast, KPL1 (a leukocyte adhesion blocking MoAb to PSGL-1) did not neutralize the binding of P-selectin to human platelets, even though it abolished the binding of P-selectin to human promyeloid HL-60 cells. Our results thus indicate that the 28-kDa glycoprotein may function as an important platelet ligand for P-selectin.

*Supported by grants from Chinese Academy of Sciences (KSCX2-2-02), National Natural Science Foundation of China (39925015, 30130090), Special Funds forMajor State Basic Research of China (Grant G1999053907)