Article ; Online: Shared recognition of citrullinated tenascin-C peptides by T and B cells in rheumatoid arthritis.
JCI insight
2021 Volume 6, Issue 5
Abstract: Tenascin-C (TNC), an extracellular matrix protein that has proinflammatory properties, is ... our findings raise the possibility that coinciding epitopes recognized by both CD4+ T cells and B cells have ...
Abstract | Tenascin-C (TNC), an extracellular matrix protein that has proinflammatory properties, is a recently described antibody target in rheumatoid arthritis (RA). In this study, we utilized a systematic discovery process and identified 5 potentially novel citrullinated TNC (cit-TNC) T cell epitopes. CD4+ T cells specific for these epitopes were elevated in the peripheral blood of subjects with RA and showed signs of activation. Cit-TNC-specific T cells were also present among synovial fluid T cells and secreted IFN-γ. Two of these cit-TNC T cell epitopes were also recognized by antibodies within the serum and synovial fluid of individuals with RA. Detectable serum levels of cit-TNC-reactive antibodies were prevalent among subjects with RA and positively associated with cyclic citrullinated peptide (CCP) reactivity and the HLA shared epitope. Furthermore, cit-TNC-reactive antibodies were correlated with rheumatoid factor and elevated in subjects with a history of smoking. This work confirms cit-TNC as an autoantigen that is targeted by autoreactive CD4+ T cells and autoantibodies in patients with RA. Furthermore, our findings raise the possibility that coinciding epitopes recognized by both CD4+ T cells and B cells have the potential to amplify autoimmunity and promote the development and progression of RA. |
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MeSH term(s) | Arthritis, Rheumatoid/immunology ; B-Lymphocytes/cytology ; B-Lymphocytes/immunology ; CD4-Positive T-Lymphocytes/cytology ; CD4-Positive T-Lymphocytes/immunology ; Epitopes, T-Lymphocyte/immunology ; Humans ; Tenascin/immunology |
Chemical Substances | Epitopes, T-Lymphocyte ; TNC protein, human ; Tenascin |
Language | English |
Publishing date | 2021-03-08 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. |
ISSN | 2379-3708 |
ISSN (online) | 2379-3708 |
DOI | 10.1172/jci.insight.145217 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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