Human cartilage glycoprotein-39 as a candidate autoantigen in rheumatoid arthritis

Arthritis and Rheumatism
G F VerheijdenA M Boots

Abstract

To identify a cartilage-derived autoantigen that is relevant to the rheumatoid arthritis (RA) disease process. A DR4 (DRB1*0401) peptide binding motif was used for the selection of potential self reactive peptides within human cartilage glycoprotein-39 (HC gp-39), a protein that is differentially expressed at the site of chronic inflammation. Synthetic peptides accommodating the motif were tested for binding the RA-associated DR4 (DRB1*0401) molecules. High-affinity binders were then tested for their capacity to stimulate peripheral blood mononuclear cell responses in RA patients or healthy donors. To assess the arthritogenic nature of native HC gp-39, the protein was injected into BALB/c mice. HC gp-39-derived motif-based peptides were selectively recognized by peripheral blood T cells from RA patients. Injection of the intact protein into BALB/c mice resulted in immunity to HC gp-39, which was found to be associated with the development of a chronic, relapsing arthritis. Moreover, inhalation of the protein led to tolerization of antigen-specific T cells and to suppression of HC gp-39-induced arthritis. These data indicate that HC gp-39 is a target of the immune response in RA. Consequently, HC gp-39 is a candidate for antigen...Continue Reading

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