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We sought to evaluate the Tph\u2013B cell axis in oligo JIA through an analysis of intra\u2010articular B cells.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>B cells from the blood and synovial fluid (SF) of 44 children with oligo JIA were compared to those from the blood and tonsils of controls. Flow cytometry, B cell receptor (BCR) repertoire analysis, and autoantibody profiling were used to characterize B cells.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Memory B (Bmem) cells and heterogeneous subsets of CD21<jats:sup>lo<\/jats:sup> B cells were enriched in oligo JIA\u2010SF versus blood of patients and controls. Compared to male patients, female patients with oligo JIA had greater proportions of intra\u2010articular Tph cells that expressed B cell help factors as well as Bmem cells, plasmablasts, and age\u2010\/autoimmune\u2010associated B cells. The sex differences in B cells were observed only in the joints and were not found in the blood or tonsil, nor were they explained by other disease features such as age at onset, antinuclear antibody status, or severity. Bmem cells in SF from female patients displayed characteristics of autoreactivity, including longer complementarity determining region 3 lengths and increased usage of autoreactive BCR gene segments, which were not found in blood Bmem cells. A diverse array of autoantibodies accumulated in the SF of female patients with oligo JIA compared to the blood of patients with JIA and controls.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>These findings demonstrate prominent B cell dysregulation in oligo JIA and implicate sex as an important biologic factor in B cell responses in this disease.<\/jats:p><\/jats:sec>","DOI":"10.1002\/art.43157","type":"journal-article","created":{"date-parts":[[2025,3,18]],"date-time":"2025-03-18T02:25:26Z","timestamp":1742264726000},"page":"1092-1105","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Sex Differences in B Cells From the Joints of Children With Oligoarticular Juvenile Idiopathic Arthritis"],"prefix":"10.1002","volume":"77","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7414-2026","authenticated-orcid":false,"given":"Ki 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