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JCS ePress
online publication date 2 Nov 2004
doi: 10.1242/jcs.01516
Research Article
PG-M/versican binds to P-selectin glycoprotein ligand-1 and mediates leukocyte aggregation
Peng-Sheng Zheng,
Dana Vais,
David LaPierre,
Yao-Yun Liang,
Vivian Lee,
Bing L. Yang,
and
Burton B. Yang*
* Author for correspondence (e-mail: burton.yang{at}sw.ca)
P-selectin glycoprotein ligand-1 (PSGL-1), a glycoprotein expressed on the cell surface of leukocytes, binds to selectins and mediates leukocyte rolling on the vascular endothelium. Here we report that PSGL-1 binds to the C-terminal (G3 domain) of the extracellular proteoglycan PG-M/versican. Cells transfected with PSGL-1 or a shorter form containing the binding site, or cells expressing endogenous PSGL-1 aggregate in the presence of versican or G3 product. The aggregation appears to be induced by G3 multimers that bind to PSGL-1 and form a network. Endogenous versican and/or G3-containing fragments also bind to PSGL-1 in human plasma. Removal of the endogenous G3-containing fragments reduces the effect of plasma on leukocyte aggregation. Finally, the roles of G3-containing fragments in leukocyte aggregation were confirmed in a mouse model. Taken together, our results strongly support a physiologically relevant role for PSGL-1/versican binding and may have implications in the immunoresponse.
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© The Company of Biologists Ltd 2004
