Semin Thromb Hemost 2000; Volume 26(Number 01): 119-126
DOI: 10.1055/s-2000-9814
Copyright © 2000 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4663)

Differences in Reactivity to Vitamin K Administration of the Vitamin K-Dependent Procoagulant Factors, Protein C and S, and Osteocalcin

Yoshitsugu Shirakawa, Akira Shirahata, Miwako Fukuda
  • Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Fukuoka Pref, Japan
Further Information

Publication History

Publication Date:
31 December 2000 (online)

 

ABSTRACT

Vitamin K is a trace nutrient necessary not only for the synthesis of four plasma clotting factors but also the production of two important anticlotting factors, protein C and protein S, and the synthesis of two bone proteins. If protein C and protein S are produced more quickly and/or in higher quantities than four plasma coagulation factors after vitamin K administration, then the result is unfavorable for stopping of hemorrhage. We therefore studied the difference of time dependence of prothrombin procoagulant factors, protein C and S and bone Gla protein after the administration of vitamin K in normal and vitamin K-deficient neonates. Results of our study showed that, on the whole, coagulation factors increased markedly more than anticlotting factors after vitamin K administration. Furthermore, the increase in bone Gla protein was also higher compared with protein C activity, although the detailed mechanism of the difference in reactivity of prothrombin procoagulant factors, protein C and S and bone Gla protein to vitamin K administration is not clear.

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