Thromb Haemost 1997; 77(02): 343-349
DOI: 10.1055/s-0038-1655966
Original Article
Schattauer GmbH Stuttgart

Simultaneous Occurrence of Human Antibodies Directed against Fibrinogen, Thrombin, and Factor V Following Exposure to Bovine Thrombin: Effects on Blood Coagulation, Protein C Activation and Platelet Function

Authors

  • Vibhuti D Chouhan

    1   Sol Sherry Thrombosis Research Center, and Departments of Medicine and Pathology, Temple University School of Medicine, Philadelphia, PA, USA
  • Raul A De La Cadena

    1   Sol Sherry Thrombosis Research Center, and Departments of Medicine and Pathology, Temple University School of Medicine, Philadelphia, PA, USA
  • Chandrasekaran Nagaswami

    3   Department of Cell and Development Biology, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
  • John W Weisel

    3   Department of Cell and Development Biology, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
  • Mehdi Kajani

    2   Albert Einstein Medical Center, Philadelphia, PA, USA
  • A Koneti Rao

    1   Sol Sherry Thrombosis Research Center, and Departments of Medicine and Pathology, Temple University School of Medicine, Philadelphia, PA, USA
Further Information

Publication History

Received 04 March 1996

Accepted after revision 15 October 1996

Publication Date:
10 July 2018 (online)

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Summary

We describe a patient with severe epistaxis, prolonged coagulation tests and decreased plasma factor V following exposure to bovine topical thrombin. Patient IgG, but not normal IgG, showed binding to immobilized thrombin (bovine > human) and fibrinogen, and to factor V by Western blotting; the binding to thrombin was inhibited by hirudin fragment 54-65. Electron microscopy of rotary shadowed preparations showed complexes with IgG molecules attached near the ends of trinodular fibrinogen molecules. Patient IgG inhibited procoagulant, anticoagulant and cell-stimulating functions of thrombin demonstrated by inhibition of fibrinogen clotting, protein C activation and platelet aggregation; thrombin hydrolysis of S-2238 was not inhibited. The results suggest that the antibody is targeted against anion-binding exosite and not catalytic site of thrombin. Antifibrinogen antibodies have not been reported in patients exposed to bovine thrombin. There is a pressing need to re-evaluate the role of bovine thrombin as a therapeutic agent.