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• W2894639200 abstract "Anti-citrullinated protein antibodies (ACPAs) are a hallmark of rheumatoid arthritis (RA). Aside from autoantibody production, the function of autoantigen-specific B cells remains poorly understood in the context of this disease. This study set out to elucidate autoantigen-specific B cell functions through the isolation and immortalization of unique citrullinated protein/peptide (CP)-reactive B cell clones from RA patients.B cell clones from either the blood or synovial fluid of cyclic citrullinated peptide 2 (CCP2) antibody-positive RA patients were immortalized by genetic reprogramming with Bcl-6 and Bcl-xL. Enzyme-linked immunosorbent assay and flow cytometry were used to identify CCP2-reactive clones and to further characterize surface marker and cytokine expression as well as B cell receptor signaling competence. Global gene expression profiles were interrogated by RNA sequencing.Three unique CP-reactive memory B cell clones were generated from the blood or synovial fluid of 2 RA patients. CP-reactive memory B cells did not appear to be broadly cross-reactive, but rather had a fairly restricted epitope recognition profile. These clones were able to secrete both pro- and antiinflammatory cytokines and had a unique surface profile of costimulatory molecules and receptors, including CD40 and C5a receptor type 1, when compared to non-CP-reactive clones from the same patient. In addition, CP-reactive clones bound citrullinated protein, but not native protein, and could mobilize calcium in response to antigen binding.CP-reactive memory B cells comprise a rare, seemingly oligoclonal population with restricted epitope specificity and distinct phenotypic and molecular characteristics suggestive of antigen-presenting cells. Cloning by genetic reprogramming opens new avenues to study the function of autoreactive memory B cells, especially in terms of antigen processing, presentation, and subsequent T cell polarization." @default.
• W2894639200 created "2018-10-12" @default.
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• W2894639200 date "2019-02-02" @default.
• W2894639200 modified "2023-10-01" @default.
• W2894639200 title "Generation and Characterization of Anti–Citrullinated Protein Antibody–Producing B Cell Clones From Rheumatoid Arthritis Patients" @default.
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• W2894639200 doi "https://doi.org/10.1002/art.40739" @default.
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