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Immunohistochemical and immunofluorescence techniques were used to assess the involved tissue of patients to determine the location of <jats:styled-content style=\"fixed-case\">IL<\/jats:styled-content>\u201021, Bcl\u20106, and <jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content>4+<jats:styled-content style=\"fixed-case\">CXCR<\/jats:styled-content>5+ Tfh cells. Furthermore, the ability of circulating Tfh (<jats:styled-content style=\"fixed-case\">cT<\/jats:styled-content>fh) cell subsets to induce B cell proliferation, apoptosis, and differentiation and to produce IgG4 was explored in cell cocultures in vitro.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Frequencies of <jats:styled-content style=\"fixed-case\">cT<\/jats:styled-content>fh cells were significantly increased in the peripheral blood of patients with IgG4\u2010<jats:styled-content style=\"fixed-case\">RD<\/jats:styled-content>, and even higher frequencies were observed in the involved tissue. Percentages of programmed cell death protein 1 in <jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content>4+<jats:styled-content style=\"fixed-case\">CXCR<\/jats:styled-content>5+<jats:styled-content style=\"fixed-case\">ICOS<\/jats:styled-content>+ <jats:styled-content style=\"fixed-case\">cT<\/jats:styled-content>fh cells were positively correlated with the serum levels of IgG and IgG4, IgG4:IgG ratio, number of involved organs, and frequency of <jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content>19+<jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content>24\u2212<jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content>38<jats:sup>high<\/jats:sup> plasmablasts\/plasma cells. Levels of <jats:styled-content style=\"fixed-case\">BLIMP<\/jats:styled-content>\u20101 and <jats:styled-content style=\"fixed-case\">IL<\/jats:styled-content>\u201021 <jats:styled-content style=\"fixed-case\">mRNA<\/jats:styled-content> in peripheral <jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content>4+ T cells were increased in patients with IgG4\u2010<jats:styled-content style=\"fixed-case\">RD<\/jats:styled-content> compared to healthy controls, and this was correlated with the levels of serum IgG4. Moreover, in the involved tissue, Bcl\u20106, <jats:styled-content style=\"fixed-case\">IL<\/jats:styled-content>\u201021, and Tfh cells were highly expressed. Compared to <jats:styled-content style=\"fixed-case\">cT<\/jats:styled-content>fh cells from healthy controls, <jats:styled-content style=\"fixed-case\">cT<\/jats:styled-content>fh cells from patients with IgG4\u2010<jats:styled-content style=\"fixed-case\">RD<\/jats:styled-content> could facilitate B cell proliferation and inhibit B cell apoptosis more efficiently, and enhanced the differentiation of naive B cells into switched memory B cells and plasmablasts\/plasma cells, with a resultant increase in the secretion of IgG4. Notably, the cTfh1 and cTfh2 cell subsets were the most effective at providing B cell help.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Tfh cell subsets are expanded in IgG4\u2010<jats:styled-content style=\"fixed-case\">RD<\/jats:styled-content> and may play pivotal roles in the pathogenesis of the disease.<\/jats:p><\/jats:sec>","DOI":"10.1002\/art.40556","type":"journal-article","created":{"date-parts":[[2018,5,21]],"date-time":"2018-05-21T04:30:30Z","timestamp":1526877030000},"page":"1853-1865","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":101,"title":["Aberrant Expansion and Function of Follicular Helper T Cell Subsets in IgG4\u2010Related Disease"],"prefix":"10.1002","volume":"70","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7142-8851","authenticated-orcid":false,"given":"Yu","family":"Chen","sequence":"first","affiliation":[{"name":"Peking Union Medical College Hospital Chinese 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