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  • Title: Exploring the binding sites of anti-infliximab antibodies in pediatric patients with rheumatic diseases treated with infliximab.
    Author: Kosmač M, Avčin T, Toplak N, Simonini G, Cimaz R, Curin Šerbec V.
    Journal: Pediatr Res; 2011 Mar; 69(3):243-8. PubMed ID: 21131896.
    Abstract:
    Over the past decade, the treatment of a variety of immune-mediated diseases has improved greatly due to the introduction of biologics for therapies in cases that are nonresponsive to traditional treatments. However, a side effect not encountered in traditional treatments is the immunogenicity of the biologics themselves. Our aim was to investigate the anti-infliximab-antibody response in pediatric patients receiving infliximab for juvenile idiopathic arthritis and other pediatric rheumatic diseases, with a focus on an analysis of the binding sites of these antibodies. We show that anti-infliximab antibodies developed in 43% of patients receiving infliximab therapy. Neutralization studies showed that in all these patients, the antibodies were directed toward the variable domains of infliximab, as they inhibited binding of infliximab to TNF. A more precise determination of the antibody epitopes using synthetic peptides was not achieved, indicating that all the antibody binding sites were composed of discontinuous segments of infliximab.
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