title: Clonally expanded CD4+CD28null T cells in rheumatoid arthritis use distinct combinations of T cell receptor BV and BJ elements.
abstract: Clonally expanded, autoreactive CD4(+)CD28(null) cells can be found in the peripheral blood of patients with rheumatoid arthritis and have been shown to be associated with severeextra-articular disease manifestations. We investigated the size of the CD4(+)CD28(null) compartment and the TCR beta chain repertoire of expanded CD4(+) clonotypes in 94 rheumatoid arthritis patients by complementarity-determining region 3 (CDR3) length analysis (spectratyping) in the BV6 and BV14 TCR families, with primers specific for three arbitrarily chosen beta chain joining elements (BJ1S2, BJ2S3 and BJ2S7). The spectratyping results showed a strong correlation of the size of the CD4(+)CD28(null) compartment with the detected number of BV14 clonotypes, whereas no association with BV6 oligoclonality was found. Only clones using the BV14-BJ1S2 and BV14-BJ2S3 combinations contributed to this correlation, however, whereas BV14-BJ2S7 clones did not. This preferential correlation implies a role for the TCR beta chain in stimulating clonal outgrowth and argues against the previously suggested superantigenic stimulation of in-vivo-expanded clones. Instead, since no evidence for shared antigen specificity could be detected, clonal expansion of T cells in rheumatoid arthritis might be influenced by the BJ elements because of changes in the flexibility of the protein backbone of the beta-chain.
authors.affiliation: Department of Medicine IV, University of Leipzig, Leipzig, Germany.
authors.forename: Ulf
authors.initials: U
authors.lastname: Wagner
authors.forename: Matthias
authors.initials: M
authors.lastname: Pierer
authors.forename: Sylke
authors.initials: S
authors.lastname: Kaltenhäuser
authors.forename: Bernd
authors.initials: B
authors.lastname: Wilke
authors.forename: Wolfram
authors.initials: W
authors.lastname: Seidel
authors.forename: Sybille
authors.initials: S
authors.lastname: Arnold
authors.forename: Holm
authors.initials: H
authors.lastname: Häntzschel
mesh_terms: D001172:Arthritis, Rheumatoid / Q000150:complications / Q000276:immunology* / Q000473:pathology*; D018106:CD28 Antigens / Q000032:analysis*; D015704:CD4 Antigens / Q000032:analysis; D015496:CD4-Positive T-Lymphocytes / Q000145:classification / Q000276:immunology* / Q000378:metabolism* / Q000473:pathology; D002999:Clone Cells; D006801:Humans; D007638:Keratoconjunctivitis Sicca / Q000150:complications; D011928:Raynaud Disease / Q000150:complications; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000378:metabolism*
chemical_list: D018106:CD28 Antigens; D015704:CD4 Antigens; D016693:Receptors, Antigen, T-Cell, alpha-beta