Plasma elimination kinetics for factor VII are independent of its activation to factor VIIa and complex formation with plasma inhibitors

Lars C. Petersen; Torben Elm; Mirella Ezban; Thomas N. Krogh; Ditte M. Karpf; Anne Steinø; Eva H. N. Olsen; Brit B. Sørensen

doi:10.1160/TH08-10-0699

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2009; 101(05): 818-826
DOI: 10.1160/TH08-10-0699

Blood Coagulation, Fibrinolysis and Cellular Haemostasis

Schattauer GmbH

Plasma elimination kinetics for factor VII are independent of its activation to factor VIIa and complex formation with plasma inhibitors

Authors

Lars C. Petersen

¹Biopharmaceutical Research Unit, Novo Nordisk, Maalov, Denmark
Torben Elm

¹Biopharmaceutical Research Unit, Novo Nordisk, Maalov, Denmark
Mirella Ezban

¹Biopharmaceutical Research Unit, Novo Nordisk, Maalov, Denmark
Thomas N. Krogh

¹Biopharmaceutical Research Unit, Novo Nordisk, Maalov, Denmark
Ditte M. Karpf

¹Biopharmaceutical Research Unit, Novo Nordisk, Maalov, Denmark
Anne Steinø

¹Biopharmaceutical Research Unit, Novo Nordisk, Maalov, Denmark
Eva H. N. Olsen

²Novo Nordisk Research Unit, North Brunswick, New Jersey, USA
Brit B. Sørensen

¹Biopharmaceutical Research Unit, Novo Nordisk, Maalov, Denmark

Abstract

Summary

The mechanism for the elimination of factor VII (FVII) from the circulation is unknown, just as it is unclear how activation of FVII to FVIIa and subsequent complex formation with antithrombin III (AT) or α2-macroglobulin (α2M) affects clearance. The possibility that the clearance mechanism involves activation and inhibitor complex formation as obligatory intermediate reactions is examined in this study. Human and murine sera were spiked with human FVIIa in the absence and presence of heparin and analysed for complex formation. Complex formation in vivo was studied after intravenous injection of ¹²⁵I-VIIa in mice; and the pharmacokinetics (PK) of human and murine FVIIa was studied in normal mice. Furthermore, comparative PK studies were performed with FVII, FVIIa, active site blocked FVIIa and a preformed FVIIa-AT complex in normal and α2M-deficient mice. The data demonstrated that FVIIa-AT complexes and to a much lesser extent FVIIa-α2M-complexes accumulated in vivo after FVIIa administration. FVIIa-AT accounted for about 50% of total FVIIa antigen left in the circulation after 3 hours. All FVII derivatives studied including FVII, FVIIa and FVIIa-AT were cleared with similar rates suggesting an elimination kinetics which is unaffected by FVII activation and subsequent inactivation by plasma inhibitors.

Keywords

Factor VIIa - antithrombin - alpha2-macroglobulin - complex formation - clearance

Full Text

References

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