Thromb Haemost 1992; 67(01): 050-055
DOI: 10.1055/s-0038-1648378
Original Articles
Schattauer GmbH Stuttgart

Modulation of Protein C Inhibitor Activity by Histidine-Rich Glycoprotein and Platelet Factor 4: Role of Zinc and Calcium Ions in the Heparin-Neutralizing Ability of Histidine-Rich Glycoprotein

Yoshiaki Kazama
The Department of Biochemistry Niigata, University School of Medicine, Niigata, Japan
,
Takehiko Koide
The Department of Biochemistry Niigata, University School of Medicine, Niigata, Japan
› Author Affiliations
Further Information

Publication History

Received 18 July 1990

Accepted after revision 25 July 1991

Publication Date:
02 July 2018 (online)

Summary

Effects of zinc and calcium ions on the heparin-neutralizing abilities of histidine-rich glycoprotein (HRG) and platelet factor 4 (PF4) were examined. Both HRG and PF4 effectively neutralized the ability of heparin to accelerate the activated protein C (APC) and the thrombin inhibitions by protein C inhibitor (PCI). The heparin-neutralizing ability of HRG in the APC inhibition by PCI, however, was decreased in a Ca2+-dependent manner and apparently lost at 1 mM Ca2+, while it was enhanced by Zn2+ regardless of the presence or absence of Ca2+. The heparinneutralizing ability of HRG in the thrombin inhibition by PCI was not affected by Ca2+.In contrast to HRG, there was no significant difference in the heparin-neutralizing ability of PF4 in the presence or absence of 1 mM Ca2+. These results strongly suggest additional physiological functions of HRG and PF4 as modulators of PCI.

 
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