Thromb Haemost 1990; 64(01): 032-037
DOI: 10.1055/s-0038-1647149
Original Article
Schattauer GmbH Stuttgart

Partial Neutralization of a Lupus Anticoagulant by Human Immunoglobulin[*]

L O Carreras
The Haemostasis and Thrombosis Section, Division of Haematology, Hospital de Clinicas, University of Buenos Aires
,
G N Pérez
The Haemostasis and Thrombosis Section, Division of Haematology, Hospital de Clinicas, University of Buenos Aires
,
M E Martinuzzo
The Haemostasis and Thrombosis Section, Division of Haematology, Hospital de Clinicas, University of Buenos Aires
,
I Malan-Borel
*   Institute for Studies on Humoral Immunity, IDEHU (CONICET-UBA), Faculty of Pharmacy and Biochemistry University of Buenos Aires, Argentina
,
A Malbrän
The Haemostasis and Thrombosis Section, Division of Haematology, Hospital de Clinicas, University of Buenos Aires
,
P B Said
The Haemostasis and Thrombosis Section, Division of Haematology, Hospital de Clinicas, University of Buenos Aires
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Publikationsverlauf

Received 26. September 1989

Accepted after revision 02. April 1990

Publikationsdatum:
25. Juli 2018 (online)

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Summary

In a patient with a Lupus Anticoagulant (LA) and recurrent fetal loss, we observed a significant shortening of the APTT after high-dose intravenous immunoglobulin infusion (IVIg).

The LA activity present in patient’s serum and purified IgG was partially neutralized by IVIg in a dose-dependent way. In addition, IgG purified from IVIg and its F(ab′)2 fragment neutralized LA activity of the patient’s IgG. In both cases, the neutralization was dose-dependent and it was obtained with similar molar ratios

The “in vitro” neutralization of LA activity and the immediate shortening of the APTT after IVIg infusion, might be mediated through idiotypel antiidiotype interactions.

On the other hand, the long-lasting effect of IVIg in this patient indicates that it may induce specific inhibition of autoantibody synthesis.

We believe that IVIg should be considered as a therapeutic alternative for LA-related clinical disorders.

Dedicated to Professor Marc Verstraete on the occasion of his 65th birthday.