Thromb Haemost 1998; 80(06): 936-941
DOI: 10.1055/s-0037-1615392
Letters to the Editor
Schattauer GmbH

Inhibition of Lupus Anticoagulant Activity by Hexagonal Phase Phosphatidylethanolamine in the Presence of Prothrombin

Joyce Rauch
1   Divisions of Rheumatology
,
Marion Tannenbaum
1   Divisions of Rheumatology
,
Carolyn Neville
1   Divisions of Rheumatology
2   Clinical Epidemiology, Department of Medicine, The Montreal General Hospital Research Institute, McGill University, Montreal, Quebec, Canada
,
Paul R. Fortin
1   Divisions of Rheumatology
2   Clinical Epidemiology, Department of Medicine, The Montreal General Hospital Research Institute, McGill University, Montreal, Quebec, Canada
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Publikationsverlauf

Received 06. April 1998

Accepted after resubmission 14. August 1998

Publikationsdatum:
07. Dezember 2017 (online)

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Summary

We have previously demonstrated that lupus anticoagulant antibodies from patients with systemic lupus erythematosus (SLE) specifically recognize hexagonal (II) phase phosphatidylethanolamine (PE), but not bilayer PE (Thromb Haemost 1989; 62: 892). In those studies, the involvement of proteins in this recognition was not evaluated. To address this issue, we have isolated IgG lupus anticoagulant antibodies from the plasma of SLE patients and evaluated the inhibition of lupus anticoagulant activity by hexagonal (II) phase PE in the presence and absence of purified plasma proteins. All six of the IgG lupus anticoagulant antibodies tested were inhibited by hexagonal (II) phase PE in the presence, but not the absence, of human prothrombin. In contrast, little or no inhibition was observed with prothrombin alone or with PE in combination with either β2-glycoprotein I or annexin V. These data indicate that, for certain lupus anticoagulant antibodies, inhibition by hexagonal (II) phase PE is dependent on prothrombin, suggesting that these antibodies recognize a complex of PE and prothrombin.