Clonal V alpha 12.1+ T cell expansions in the peripheral blood of rheumatoid arthritis patients

doi:10.1084/jem.177.6.1623

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Clonal V alpha 12.1+ T cell expansions in the peripheral blood of rheumatoid arthritis patients

H DerSimonian, M Sugita, DN Glass, AL Maier, ME Weinblatt, T Reme and MB Brenner
Department of Rheumatology and Immunology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115.

Rheumatoid arthritis (RA) represents a heterogenous disease characterized by chronic polyarthritis. Most patients with adult RA inherit HLA-DR4 or -DR1 major histocompatibility complex (MHC) genes. While the molecular basis for this genetic predisposition is unknown, the major function of these MHC-encoded molecules is to present peptides to T lymphocytes. It is hypothesized that an endogenous or environmental antigen initiates a MHC-restricted immune response mediated by T lymphocytes, which is followed by a chronic inflammatory reaction involving many cell types. In chronic RA, previous or ongoing antigenic activation might result in detectable skewing of the peripheral alpha/beta T cell receptor (TCR) repertoire. Here we demonstrate a marked expansion of V alpha 12.1-bearing CD8+ T cells in the peripheral blood (mean, 22%; range, 10-43%) of > 15% of RA patients. A major proportion of these patients shared HLA-DQ2 in addition to the expected high frequency DR1 and DR4 alleles. Detailed molecular analysis in three of the RA patients with elevated V alpha 12.1+ T cells identified repeated TCR alpha chain sequences consistent with clonal V alpha 12.1+,CD8+ T cell expansion. In addition to shared TCR V alpha 12.1 germline gene usage among unrelated subjects, a conserved J alpha motif was also detected. Together, these results suggest an antigen-driven mechanism of T cell expansion in these patients and may offer a new approach in examining specific antigen that stimulate T cells in RA.
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