Evaluation of the Antihemostatic and Antithrombotic Effects of Lowering Coagulation Factor VII Levels in a Non-human Primate

Michael Wallisch, Sven R. Olson, Jeffrey Crosby, Jennifer Johnson, Susan F. Murray, Joseph J. Shatzel, Erik I. Tucker, Owen J.T. McCarty, Monica T. Hinds, Brett P. Monia, András Gruber

Research output: Contribution to journalArticle

Abstract

Introduction: Tissue factor (TF) and factor (F) VII, components of the extrinsic pathway of blood coagulation, are essential for hemostatic plug formation in response to injury; less clear are their roles in propagating thrombosis, as observational data in humans with congenital FVII deficiency suggests persistent thrombotic and bleeding risk even at significantly decreased FVII levels. We aimed to define the contribution of FVII to thrombus formation and hemostasis using a non-human primate model. Methods: We treated baboons with a FVII antisense oligonucleotide (ASO) and measured platelet and fibrin deposition inside and distal to collagen- or TF-coated vascular grafts. We assessed hemostasis by measuring bleeding time (BT) and prothrombin time (PT). Enoxaparin and vehicle treatments served as controls. Results: FVII–ASO treatment reduced FVII levels by 95% and significantly increased both the PT and BT. Lowering FVII levels did not decrease platelet deposition in collagen- or TF-coated grafts, in thrombi distal to the grafts, or fibrin content of either collagen- and TF-coated grafts. Lowering FVII levels were associated with a modest 25% reduction in platelet deposition at 60 min in the distal thrombus tail of TF-coated grafts only. Conclusions: FVII inhibition by way of ASO is feasible yet significantly impairs hemostasis while only exhibiting antithrombotic effects when thrombosis is initiated by vessel wall surface-associated TF exposure.

Original languageEnglish (US)
JournalCellular and Molecular Bioengineering
DOIs
StateAccepted/In press - Jan 1 2020

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Keywords

  • Blood platelet
  • Coagulation factor VII
  • Hemostasis
  • Shear flow
  • Thrombosis

ASJC Scopus subject areas

  • Modeling and Simulation
  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Wallisch, M., Olson, S. R., Crosby, J., Johnson, J., Murray, S. F., Shatzel, J. J., Tucker, E. I., McCarty, O. J. T., Hinds, M. T., Monia, B. P., & Gruber, A. (Accepted/In press). Evaluation of the Antihemostatic and Antithrombotic Effects of Lowering Coagulation Factor VII Levels in a Non-human Primate. Cellular and Molecular Bioengineering. https://doi.org/10.1007/s12195-020-00613-4