Thromb Haemost 2013; 110(01): 62-75
DOI: 10.1160/TH13-01-0069
Blood Coagulation, Fibrinolysis and Cellular Haemostasis
Schattauer GmbH

Elevated plasma factor VIII enhances venous thrombus formation in rabbits: Contribution of factor XI, von Willebrand factor and tissue factor

Chihiro Sugita
1   Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
,
Atsushi Yamashita
1   Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
,
Yunosuke Matsuura
1   Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
2   Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
,
Takashi Iwakiri
1   Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
2   Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
,
Nozomi Okuyama
1   Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
,
Shuntaro Matsuda
3   Divisions of Community and Family Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
,
Tomoko Matsumoto
4   Department of Pediatrics, Nara Medical University, Nara, Japan
,
Osamu Inoue
5   Department of Clinical and Laboratory Medicine, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
,
Aya Harada
6   Research Division, Chugai Pharmaceutical Co., Ltd., Shizuoka, Japan
,
Takehisa Kitazawa
6   Research Division, Chugai Pharmaceutical Co., Ltd., Shizuoka, Japan
,
Kunihiro Hattori
6   Research Division, Chugai Pharmaceutical Co., Ltd., Shizuoka, Japan
,
Midori Shima
4   Department of Pediatrics, Nara Medical University, Nara, Japan
,
Yujiro Asada
1   Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
› Author Affiliations
Further Information

Publication History

Received: 28 January 2013

Accepted after minor revision: 12 April 2013

Publication Date:
30 November 2017 (online)

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Summary

Elevated plasma levels of factor VIII (FVIII) are associated with increased risk of deep venous thrombosis. The aim of this study is to elucidate how elevated FVIII levels affect venous thrombus formation and propagation in vivo. We examined rabbit plasma FVIII activity, plasma thrombin generation, whole blood coagulation, platelet aggregation and venous wall thrombogenicity before and one hour after an intravenous infusion of recombinant human FVIII (rFVIII). Venous thrombus induced by the endothelial denudation of rabbit jugular veins was histologically assessed. Thrombus propagation was evaluated as indocyanine green fluorescence intensity. Argatroban, a thrombin inhibitor, and neutralised antibodies for tissue factor (TF), factor XI (FXI), and von Willebrand factor (VWF) were infused before or after thrombus induction to investigate their effects on venous thrombus formation or propagation. Recombinant FVIII (100 IU/kg) increased rabbit plasma FVIII activity two-fold and significantly enhanced whole blood coagulation and total plasma thrombin generation, but did not affect initial thrombin generation time, platelet aggregation and venous wall thrombogenicity. The rFVIII infusion also increased the size of venous thrombus 1 hour after thrombus induction. Argatroban and the antibodies for TF, FXI or VWF inhibited such enhanced thrombus formation and all except TF suppressed thrombus propagation. In conclusion, elevated plasma FVIII levels enhance venous thrombus formation and propagation. Excess thrombin generation by FXI and VWF-mediated FVIII recruitment appear to contribute to the growth of FVIII-driven venous thrombus.