2016 Fiscal Year Final Research Report
Diversity of T follicular helper cells in the pathogenesis of systemic autoimmune diseases
| Project/Area Number |
26461496
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Collagenous pathology/Allergology
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| Research Institution | University of Occupational and Environmental Health, Japan |
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Principal Investigator |
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| Research Collaborator |
MA Gyosetsu
KUBO Satoshi
YAMAGATA Kaoru
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 濾胞性ヘルパーT細胞 / 全身性エリテマトーデス / インターフェロン / インターロイキン / エピジェネティクス |
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| Outline of Final Research Achievements |
We investigated the phenotype of Tfh cells in patients with SLE and epigenetic modifications by STAT family transcription factors. The proportion of CD4+CXCR5+CXCR3+CCR6-CD69+ Tfh-Th1-like cells was increased in SLE patients. In vitro, IL-12 increased differentiation of CD4+CXCR5+CXCR3+Bcl-6+T-bet+IL-21+IFN-γ+ Tfh-Th1-like cells through phosphorylation of STAT1 and STAT4. The loci of Bcl-6 and T-bet at STAT binding sites in TCR-stimulated CD4+ T cells were marked by bivalent histone modifications. After IL-12 stimulation, both STAT1 and STAT4 directly bound on Bcl-6 and T-bet gene loci accompanied by suppression of trimethylated H3K27me3 repressive histone mark. Knockdown of STAT1 or STAT4 abolished the capacity of CD4+ T cells to differentiate into Tfh-Th1-like cells after IL-12 stimulation. Our observations suggest that IL-12-mediated activation of both STAT1 and STAT4 alters histone modification and may commit the characteristic expansion of Tfh-Th1-like cells in SLE.
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| Free Research Field |
リウマチ膠原病学
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