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First published online 2 November 2004
doi: 10.1242/jcs.01516

Journal of Cell Science 117, 5887-5895 (2004)
Published by The Company of Biologists 2004
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Research Article

PG-M/versican binds to P-selectin glycoprotein ligand-1 and mediates leukocyte aggregation

Peng-Sheng Zheng1,3, Dana Vais1,3, David LaPierre1,3, Yao-Yun Liang2, Vivian Lee1,3, Bing L. Yang1,3 and Burton B. Yang1,3,*

1 Sunnybrook and Women's College Health Sciences Centre, 2075 Bayview Avenue, Toronto, ON M4N 3M5, Canada
2 Michael E. DeBakey Department of Surgery, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
3 Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON M5G 1L5, Canada

* Author for correspondence (e-mail: burton.yang{at}sw.ca)

Accepted 31 August 2004

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.

Key words: PSGL-1, Selectin, G3 domain, Interaction, Aggregation


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