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• W3137694501 abstract "Abstract Antineutrophil cytoplasmic antibodies (ANCA)‐associated vasculitis (AAV) is an autoimmune disease characterized by B cells‐derived ANCAs, and ANCA was proved to be a key factor in its pathogenesis. Follicular regulatory T (Tfr) and follicular helper T (Tfh) cells were T‐cell subsets that play important roles in B‐cell maturation and antibody production. However, their significances in microscopic polyangiitis (MPA) patients, one type of AAV, has not been thoroughly studied. In this study, comprehensive pattern analyses of circulating Tfr and Tfh were performed in MPA patients and healthy controls (HCs), and we found Tfr levels and Tfr/Tfh ratios were significantly decreased in MPA patients. Compared with HCs, Helios+, CD45RA‐FoxP3hi, and Ki‐67+ Tfr were lower in MPA patients, while CD226+ Tfr cells were higher. These phenotypes suggest that function and proliferation ability of Tfr cells were relatively impaired. Tfh subsets, including ICOS+PD‐1+ and Ki‐67+ Tfh, were significantly increased, suggesting that the function of Tfh was enhanced in MPA although the total Tfh levels did not change significantly. Circulating memory B cells and plasmablasts were significantly elevated and negatively correlated with Tfr levels and Tfr/Tfh ratios in MPA patients. In addition, Tfr levels and Tfr/Tfh ratios were negatively while Tfh was positively correlated with serum myeloperoxidase (MPO)‐ANCA levels. Furthermore, Tfr and Tfr/Tfh ratio were also reversely associated with SCr, BUN, IL‐4, and IL‐21 levels. Our results suggest that the imbalance of Tfr and Tfh functional subsets is related to increased level of autoantibodies in MPA patients, and we propose a new mechanism for the pathogenesis of MPA." @default.
• W3137694501 created "2021-03-29" @default.
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• W3137694501 date "2021-04-23" @default.
• W3137694501 modified "2023-10-05" @default.
• W3137694501 title "Altered follicular regulatory T (Tfr)‐ and helper T (Tfh)‐cell subsets are associated with autoantibody levels in microscopic polyangiitis patients" @default.
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• W3137694501 doi "https://doi.org/10.1002/eji.202049093" @default.
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