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Pooled Normal Human Polyspecific IgM Contains Neutralizing Anti-Idiotypes to IgG Autoantibodies of Autoimmune Patients and Protects From Experimental Autoimmune Disease
Vincent Hurez,
Michel D. Kazatchkine,
Tchavdar Vassilev,
Sheela Ramanathan,
Anastas Pashov,
Bertrand Basuyaux,
Yvonne de Kozak,
Blanche Bellon, and
Srini V. Kaveri
From INSERM U430 and Université Pierre et Marie Curie, Hôpital Broussais, Paris, France; the Laboratoire Français du Fractionnement et des Biotechnologies (LFB), Les Ulis, France; and INSERM U86, Paris, France.
Normal human serum contains IgM antibodies that regulate the natural autoantibody activity of IgG in autologous serum. In the present study, we show that pooled normal human IgM (IVIgM) purified from plasma of more than 2,500 healthy donors and processed in a similar fashion to that of therapeutic preparations of pooled normal human IgG (IVIg) suppresses activity of IgG autoantibodies purified from the serum of patients with autoimmune diseases in vitro. The inhibitory effect of IVIgM was greater or equivalent to that of IVIg on a molar basis. We show that IVIgM contains anti-idiotypic antibodies directed against idiotypic determinants of autoantibodies, in particular by showing that Sepharose-bound IVIgM selectively retained F(ab')2 fragments of IgG autoantibodies. The infusion of (Lewis × Brown-Norway) F1 rats with IVIgM protected the animals against experimental autoimmune uveitis induced by immunization with the soluble retinal S antigen, as evidenced by clinical scoring and histopathological analysis. The present findings provide a rationale for considering pooled IgM for immunomodulation of autoimmune disease.
Blood, Vol. 90 No. 10 (November 15), 1997:
pp. 4004-4013
© 1997 by The American Society of Hematology.
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