A Variant of Glanzmann's Thrombasthenia Characterized by Abnormal Glycoprotein IIb/IIIa Complex Formation

Dominique J Fournier; Arnold Kabral; Peter A Castaldi; Michael C Berndt

doi:10.1055/s-0038-1651038

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 1989; 62(03): 977-983
DOI: 10.1055/s-0038-1651038

Original Article

Schattauer GmbH Stuttgart

A Variant of Glanzmann's Thrombasthenia Characterized by Abnormal Glycoprotein IIb/IIIa Complex Formation

Dominique J Fournier

The Research Centre for Thrombosis and Cardiovascular Disease, Department of Medicine, University of Sydney, Westmead Hospital, Westmead, N.S.W., Australia

,

Arnold Kabral

The Research Centre for Thrombosis and Cardiovascular Disease, Department of Medicine, University of Sydney, Westmead Hospital, Westmead, N.S.W., Australia

,

Peter A Castaldi

The Research Centre for Thrombosis and Cardiovascular Disease, Department of Medicine, University of Sydney, Westmead Hospital, Westmead, N.S.W., Australia

,

Michael C Berndt

The Research Centre for Thrombosis and Cardiovascular Disease, Department of Medicine, University of Sydney, Westmead Hospital, Westmead, N.S.W., Australia

› Author Affiliations

Abstract

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Summary

Glanzmann's thrombasthenia is a congenital bleeding abnormality characterized by absent platelet aggregation due to the failure of fibrinogen to bind to activated thrombasthenic platelets. In the majority of cases, this defect is caused by the absence or marked reduction of a specific fibrinogen-binding aggregation receptor, the GP IIb/IIIa complex. E.T., an 18-year-old female with a life-long history of bleeding and easy bruising, had the normal clinical features of Glanzmann's thrombasthenia. Surprisingly, sodium dodecyl sulphate-polyacrylamide gel electrophoresis of her platelets showed no apparent abnormality of the GP IIb/IIIa complex. Control platelets washed in the presence of 2 mM EDTA and control and patient platelets washed in the presence of 2 mM calcium ions showed normal reactivity with anti-GP IIb, anti-GP Ilia, and anti-GP IIb/IIIa complex specific monoclonal antibodies as evaluated by flow cytometry. In contrast, patient's platelets washed in the presence of 2 mM EDTA reacted with anti-GP IIb, anti-GP Ilia, but not with the complex-specific monoclonal antibodies. The increased susceptibility of the patient's GP IIb/IIIa complex to EDTA dissociation was confirmed by crossed immunoelectrophoresis (CIE). CIE analysis further indicated that the patient's GP IIb/IIIa complex did not bind fibrinogen. The combined results suggest that this patient has Glanzmann's thrombasthenia due to an abnormal association of the GP IIb/IIIa complex which results in the failure of the complex to bind fibrinogen.

Keywords

Platelet - Glycoprotein IIb - Variant Glanzmann's thrombasthenia

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References

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