Clinically, there were no correlations between mAb 12A staining and clinical or biologic parameters in RA. However, positive staining was observed in 61.5% of the inflamed RA synovial samples compared with only 3.0% of the control samples (P < 0.001). This mAb 12A staining was not related to intracellular citrullinated peptides, which are another specific histologic marker for RA.Conclusion. Presentation by synovial dendritic cells of the immunodominant epitope of HC gp-39, in the context of the shared epitope, is associated with characteristic histologic features of follicular synovitis and is highly specific for RA. This suggests a contribution to the autoimmune-related tissue inflammation and provides a new and independent tool for the immunopathologic diagnosis of RA.
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