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We performed DNA microarray analyses of CD4\n                    <jats:sup>+<\/jats:sup>\n                    T cells in patients with RA before and after MTX treatment and found that\n                    <jats:italic>TP63<\/jats:italic>\n                    was the most significantly downregulated gene after MTX treatment. TAp63, an isoform of TP63, was highly expressed in human IL-17\u2013producing Th (Th17) cells and was suppressed by MTX in vitro. Murine TAp63 was expressed at high levels in Th cells and at lower levels in thymus-derived Treg cells. Importantly, TAp63 knockdown in murine Th17 cells ameliorated the adoptive transfer arthritis model. RNA-Seq analyses of human Th17 cells overexpressing TAp63 and those with TAp63 knockdown identified\n                    <jats:italic>FOXP3<\/jats:italic>\n                    as a possible TAp63 target gene. TAp63 knockdown in CD4\n                    <jats:sup>+<\/jats:sup>\n                    T cells cultured under Th17 conditions with low-dose IL-6 increased Foxp3 expression, suggesting that TAp63 balances Th17 cells and Treg cells. Mechanistically, TAp63 knockdown in murine induced Treg (iTreg) cells promoted hypomethylation of conserved noncoding sequence 2 (CNS2) of the Foxp3 gene and enhanced the suppressive function of iTreg cells. Reporter analyses revealed that TAp63 suppressed the activation of the Foxp3 CNS2 enhancer. Collectively, TAp63 suppresses Foxp3 expression and exacerbates autoimmune arthritis.\n                  <\/jats:p>","DOI":"10.1172\/jci.insight.164778","type":"journal-article","created":{"date-parts":[[2023,5,21]],"date-time":"2023-05-21T14:00:56Z","timestamp":1684677656000},"source":"Crossref","is-referenced-by-count":16,"title":["TAp63, a methotrexate target in CD4+ T cells, suppresses Foxp3 expression and exacerbates autoimmune arthritis"],"prefix":"10.1172","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3107-788X","authenticated-orcid":true,"given":"Kensuke","family":"Suga","sequence":"first","affiliation":[{"name":"Department of Allergy and Clinical Immunology, Graduate School of Medicine, and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2593-565X","authenticated-orcid":true,"given":"Akira","family":"Suto","sequence":"additional","affiliation":[{"name":"Department of Allergy and Clinical Immunology, Graduate 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