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Network regulation in rheumatoid arthritis. Studies of DR+ T cells, anti-DR, antiidiotypic antibodies, and clinical disease activity.

We prospectively studied rheumatoid arthritis patients with various degrees of clinical disease activity, for the presence of DR+ T cells by flow cytometry, for anti-DR using immunoblot analysis, and for antiidiotypic (anti-id) antibodies by enzyme-linked immunosorbent assay using F(ab')2 monoclonal antibody anti-DR L243 as idiotype. DR+ T cells correlated positively with anti-DR, and anti-id correlated negatively with both DR+ T cells and anti-DR. Active clinical disease correlated positively with both DR+ T cells and anti-DR, and correlated negatively with anti-id. This DR antigen/anti-DR/anti-id network may control disease activity in rheumatoid arthritis patients.