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

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
› Author Affiliations
Further Information

Publication History

Received 04 March 1996

Accepted after revision 15 October 1996

Publication Date:
10 July 2018 (online)

Zoom Image

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.