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Thromb Haemost 2001; 85(05): 890-895
DOI: 10.1055/s-0037-1615764
Review Article
Schattauer GmbH

Histidine-Proline-Rich Glycoprotein Binding to Platelets Mediated by Transition Metals

McDonald K. Horne III
1   Hematology Service, Department of Laboratory Medicine, Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, MD, USA
,
Paula K. Merryman
1   Hematology Service, Department of Laboratory Medicine, Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, MD, USA
,
Ann M. Cullinane
1   Hematology Service, Department of Laboratory Medicine, Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, MD, USA
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Publikationsverlauf

Received 31. Oktober 2000

Accepted after revision 20. Dezember 2000

Publikationsdatum:
11. Dezember 2017 (online)

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Summary

Histidine-proline-rich glycoprotein (HPRG) binds zinc, which in turn promotes HPRG binding to lymphocytes and monocytes. We examined the possibility that zinc and other transition metals also promote HPRG binding to platelets. Only non-specific, unsaturable association of HPRG with resting or activated platelets was observed in the absence of transition metals. However, nickel, cobalt, copper, cadmium, and zinc greatly increased HPRG association with the cells. In the presence of zinc, specific, saturable binding of HPRG to platelets was demonstrated. The cell binding capacity for HPRG could be increased by increasing the zinc saturation of HPRG from 10% to 30% as well as by activating the platelets with thrombin. Because platelets contain relatively high concentrations of secretable zinc, it is possible that significant amounts of HPRG bind to activated platelets at sites of blood clotting and that this has a physiologic function.

Keywords

Histidine-proline-rich glycoprotein - platelets - fibrinolysis - zinc
 

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