| 研究課題/領域番号 |
21F21112
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 補助金 |
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| 応募区分 | 外国 |
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| 審査区分 |
小区分49070:免疫学関連
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| 研究機関 | 大阪大学 |
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研究代表者 |
竹田 潔 大阪大学, 大学院医学系研究科, 教授 (20309446)
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| 研究分担者 |
LI BO 大阪大学, 医学(系)研究科(研究院), 外国人特別研究員
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| 研究期間 (年度) |
2021-04-28 – 2023-03-31
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| 研究課題ステータス |
完了 (2022年度)
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| 配分額 *注記 |
2,300千円 (直接経費: 2,300千円)
2022年度: 1,100千円 (直接経費: 1,100千円)
2021年度: 1,200千円 (直接経費: 1,200千円)
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| キーワード | intestine stromal cell / ubiquitination / intestine / stromal cell |
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| 研究開始時の研究の概要 |
Several subsets of intestinal stromal cells were identified. However, it remains unclear whether intestinal stromal cells are implicated in the pathogenesis of IBD. Single nucleotide polymorphism of the OTU domain-containing protein 3 (Otud3) gene, which is highly expressed in intestinal stromal cells, is reported in ulcerative colitis. Therefore, we will analyze the function of Otud3 in the maintenance of intestinal homeostasis. This study will reveal a novel stromal cell-dependent mechanism for the pathogenesis of IBD.
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| 研究実績の概要 |
To assess the physiological function of OTUD3 in the intestine, we generated Otud3 deficient mice by using gene targeting. We observed that deficient mice exhibited more severe colitis during DSS administration.In murine colon, Otud3 mRNA was highly expressed in fibroblasts relative to epithelia cells and innate and adaptive immune cells. Otud3 deficiency in fibroblasts leads to aggravation of colitis.By performing scRNA-seq analysis using colonic fibroblasts, we found
OTUD3 modulates the STING-IFN signaling pathway in a special subset of colonic fibroblasts.By making use of antibiotics (ABX) treatment and germ free mice, we found OTUD3 modulates the microbial cGAMP-STING-IFN pathway in colonic fibroblasts.We generated a knock-in strain of OTUD3 UC risk variant mice, and confirmed this UC risk variant in OTUD3 is associated with dysregulation of STING activation in intestinal fibroblasts.
Now I am preparing to submit the paper to a major acdemic journal.Fibroblasts, the most abundant structural cells, exert homeostatic functions but also drive disease pathogenesis. Single-cell technologies have illuminated the shared characteristics of pathogenic fibroblasts in multiple diseases. However, the molecular mechanisms underlying the disease-associated fibroblast phenotypes remain largely unclear. Our findings provide a mechanistic basis for pathogenic fibroblast polarization and have important therapeutic implications
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| 現在までの達成度 (段落) |
令和4年度が最終年度であるため、記入しない。
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| 今後の研究の推進方策 |
令和4年度が最終年度であるため、記入しない。
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