The Journal of Experimental Medicine
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Published online 10 July 2000.
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© The Rockefeller University Press, 0022-1007/2000/7/193/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 2, July 17, 2000 193-204


Original Article

Platelet Glycoprotein Ib{alpha} Is a Counterreceptor for the Leukocyte Integrin Mac-1 (CD11b/CD18)

Daniel I. Simona, Zhiping Chena, Hui Xua, Chester Q. Lib,c, Jing-fei Dongb,c, Larry V. McIntiree, Christie M. Ballantynec, Li Zhangf, Mark I. Furmang, Michael C. Berndth, and José A. Lópezb,c,d
a Cardiovascular Division, Brigham and Women's Hospital, Boston, Massachusetts 02115
b Thrombosis Research Section, Baylor College of Medicine, Houston, Texas 77030
c Department of Medicine, Baylor College of Medicine, Houston, Texas 77030
d Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030
e Cox Laboratory for Bioengineering, Rice University, Houston, Texas 77251
f American Red Cross, Holland Laboratory, Rockville, Maryland 20855
g Center for Platelet Function Studies, Division of Cardiovascular Medicine, University of Massachusetts, Worcester, Massachusetts 01655
h Baker Medical Research Institute, Prahran, Victoria 3181, Australia

Correspondence to: Daniel I. Simon, Brigham and Women's Hospital, Cardiovascular Division, 75 Francis St. Tower 3, Boston, MA 02115. Tel:617-732-7820 Fax:617-732-5132 E-mail:dsimon{at}rics.bwh.harvard.edu.

The firm adhesion and transplatelet migration of leukocytes on vascular thrombus are both dependent on the interaction of the leukocyte integrin, Mac-1, and a heretofore unknown platelet counterreceptor. Here, we identify the platelet counterreceptor as glycoprotein (GP) Ib{alpha}, a component of the GP Ib-IX-V complex, the platelet von Willebrand factor (vWf) receptor. THP-1 monocytic cells and transfected cells that express Mac-1 adhered to GP Ib{alpha}–coated wells. Inhibition studies with monoclonal antibodies or receptor ligands showed that the interaction involves the Mac-1 I domain (homologous to the vWf A1 domain), and the GP Ib{alpha} leucine-rich repeat and COOH-terminal flanking regions. The specificity of the interaction was confirmed by the finding that neutrophils from wild-type mice, but not from Mac-1–deficient mice, bound to purified GP Ib{alpha} and to adherent platelets, the latter adhesion being inhibited by pretreatment of the platelets with mocarhagin, a protease that specifically cleaves GP Ib{alpha}. Finally, immobilized GP Ib{alpha} supported the rolling and firm adhesion of THP-1 cells under conditions of flow. These observations provide a molecular target for disrupting leukocyte–platelet complexes that promote vascular inflammation in thrombosis, atherosclerosis, and angioplasty-related restenosis.

Key Words: inflammation, leukocytes, platelets, adhesion, receptors


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