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Analysis of molecular mechanisms underlying vasculitis in ADA2 deficiency

Research Project

Project/Area Number 22K15939
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionKyoto University

Principal Investigator

Nihira Hiroshi  京都大学, 医学研究科, 特定助教 (00881301)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords自己炎症性疾患 / ADA2欠損症 / 血管炎 / ADA2 / 共培養 / 化合物スクリーニング / IFN-γ / インターフェロン
Outline of Research at the Start

ADA2欠損症は遺伝性自己炎症性疾患の1つで、単一遺伝性疾患で唯一全身性の中型動脈炎を来す疾患である。我々は患者末梢血細胞の解析を通し、2型インターフェロン(IFNーγ)経路の機能亢進がADA2欠損症患者で特異的に生じている事を世界で初めて明らかにした。本研究は、血管炎モデルを用いてADA2欠損症の炎症機構をより詳細に解析・解明する事を目的とする。本研究で得られる結果は、結節性多発動脈炎等その他の血管炎症候群の病態解析・新規治療開発にもつながる事が期待される。

Outline of Final Research Achievements

ADA2 deficiency is a hereditary autoinflammatory disease characterized by systemic small- to medium-sized arteritis. Its mechanism of vasculitis remains unknown. In this study, we performed ADA2 knockout in a human cell line using CRISPR/Cas9 and constructed an assay system to reproduce the pathological condition of vasculitis by co-culturing with fibroblasts. We also performed drug screening using the same assay system, and confirmed the efficacy of JAK inhibitors. In addition, we used immunoprecipitation and proximal-dependent biotinylation labeling to reveal molecules that directly bind to or interact with ADA2, which had not been shown before. These results indicate a new possibility that could lead to elucidation of the molecular mechanism of ADA2 deficiency.

Academic Significance and Societal Importance of the Research Achievements

ADA2欠損症は結節性多発動脈炎類似の臨床型を呈し、本結果で得られた知見は、非単一遺伝子性のその他の血管炎症候群の病態理解に寄与する。また患者細胞を使用しない形での病態再現系を構築した事により、継続的な病態解析や新規薬剤評価が可能となった。加えて、既存のデアミナーゼ活性解析以外のADA2機能評価を行う事で、従来とは異なる変異疾患原性評価を可能とした。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (3 results)

All 2023

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results)

  • [Journal Article] A complementary approach for genetic diagnosis of inborn errors of immunity using proteogenomic analysis2023

    • Author(s)
      Sakura F, Noma K, Asano T, Tanita K, Toyofuku E, Kato K, Tsumura M, Nihira H, Izawa K, Mitsui-Sekinaka K, Konno R, Kawashima Y, Mizoguchi Y, Karakawa S, Hayakawa S, Kawaguchi H, Imai K, Nonoyama S, Yasumi T, Ohnishi H, Kanegane H, Ohara O, Okada S
    • Journal Title

      PNAS Nexus

      Volume: 2 Issue: 4 Pages: 1-12

    • DOI

      10.1093/pnasnexus/pgad104

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 抗integrin αvβ6抗体の小児IBDにおける多施設検討2023

    • Author(s)
      仁平 寛士
    • Organizer
      日本免疫不全・自己炎症学会総会 2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] ろ紙血プロテオームを用いた、先天性免疫異常症における新規バイオマーカー2023

    • Author(s)
      仁平 寛士
    • Organizer
      日本免疫不全・自己炎症学会総会 2023
    • Related Report
      2023 Annual Research Report

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Published: 2022-04-19   Modified: 2025-01-30  

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