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Analysis about mitochondrial genome signaling for activating NLRP3 inflammation

Research Project

Project/Area Number 21K20640
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0701:Biology at molecular to cellular levels, and related fields
Research InstitutionKyushu University

Principal Investigator

Kasho Kazutoshi  九州大学, 薬学研究院, 助教 (90726019)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsミトコンドリア / mtDNA / 複製 / NLRP3 / mtDNA複製 / 炎症 / 試験管内再構成 / 試験管内解析 / 複製開始 / コピー数
Outline of Research at the Start

NLRP3インフラマソームを介した炎症反応において、免疫細胞が細菌由来物質LPSに曝露されることでミトコンドリアゲノムmtDNAの速やかな複製とコピー数増加が誘導され、NLRP3活性化に必須のmtDNA由来シグナルが産生される。一方で、炎症時におけるmtDNA複製の促進機構は未解明である。本研究では二次元ゲル電気泳動法や試験管内でのmtDNA複製再構成実験などの手法を用いてmtDNA複製の促進機構を詳細に解析し、NLRP3炎症制御の全容解明を目指す。本研究によりNLRP3炎症時のmtDNA複製制御機構が解明されれば、炎症応答に起因する疾患に対する創薬に繋がる。

Outline of Final Research Achievements

Mitochondrial genome (mtDNA) is an essential signaling factor for the activation of the NLRP3 inflammasome against a broad range of pathogens such as LPS (lipopolysaccharides) and in response, activates inflammation. Mitochondria are able to sense an innate immune priming event caused by an injury or a microbial damage, and convert this signal via mtDNA release to activate NLRP3, which occurs through LPS-dependent increase of mtDNA copy number and subsequent mtDNA modification. However, the mechanism for stimulating mtDNA replication remains unveiled. This study tried to reveal the regulatory mechanism for mtDNA copy number after LPS treatment and to reconstitute mtDNA replication in vitro.

Academic Significance and Societal Importance of the Research Achievements

本研究はNLRP3炎症反応の起点となるLPS依存的mtDNA複製における複製モードとその制御様式の解明を目指す初の試みであり新規性、独自性が高い。加えて、NLRP3炎症反応の制御因子としてmtDNA複製促進に必須な因子を探索するというアプローチも独創的と言える。本研究を基盤にして新規NLRP3制御因子が同定されれば、神経変性疾患などの炎症過剰亢進に起因する疾患の治療薬ターゲットの創造に繋がる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (8 results)

All 2022 2021 Other

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results) Remarks (1 results)

  • [Journal Article] Concerted actions of DnaA complexes with DNA-unwinding sequences within and flanking replication origin oriC promote DnaB helicase loading2022

    • Author(s)
      Sakiyama Yukari、Nagata Mariko、Yoshida Ryusei、Kasho Kazutoshi、Ozaki Shogo、Katayama Tsutomu
    • Journal Title

      Journal of Biological Chemistry

      Volume: 298 Issue: 6 Pages: 102051-102051

    • DOI

      10.1016/j.jbc.2022.102051

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] TFB2M and POLRMT are essential for mammalian mitochondrial DNA replication2022

    • Author(s)
      Inatomi Teppei、Matsuda Shigeru、Ishiuchi Takashi、Do Yura、Nakayama Masunari、Abe Shusaku、Kasho Kazutoshi、Wanrooij Sjoerd、Nakada Kazuto、Ichiyanagi Kenji、Sasaki Hiroyuki、Yasukawa Takehiro、Kang Dongchon
    • Journal Title

      Biochimica et Biophysica Acta (BBA) - Molecular Cell Research

      Volume: 1869 Issue: 1 Pages: 119167-119167

    • DOI

      10.1016/j.bbamcr.2021.119167

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 脊椎動物型ミトコンドリアゲノム複製開始の進化的起源に迫る2022

    • Author(s)
      加生 和寿、片山 勉
    • Organizer
      第45回 日本分子生物学会年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Regulation of replication initiation timing by timely binding and dissociation of the nucleoid protein IHF in Escherichia coli2022

    • Author(s)
      Kazutoshi Kasho, Taku Oshima, Onuma Chumsakul, Kensuke Nakamura, Kazuki Fukamachi, Kazuyuki Fujimitsu, and Tsutomu Katayam
    • Organizer
      遺伝研国際シンポジウム2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] PrimPol-PolDIP2 複合体によるミトコンドリアゲノム維持の分子機構2021

    • Author(s)
      加生 和寿, Gorazd Stojkovic, Mara Doimo, Berner Andreas, Cristina Velazquez-Ruiz, Maria I. Martinez-Jimenez, Timothee Laurent, Aldo E. Perez-Rivera, Luis Blanco, Sjoerd Wanrooij
    • Organizer
      第26回 DNA複製・組換え・修復ワークショップ
    • Related Report
      2021 Research-status Report
  • [Presentation] 大腸菌の核様体蛋白質IHFはゲノム複製開始時期において複製開始点oriCとの結合が特異的に安定化される2021

    • Author(s)
      加生 和寿、大島 拓、Onuma Chumsakul、中村 健介、深町 和貴、片山 勉
    • Organizer
      第94回 日本生化学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ユニークな多機能蛋白質PolDIP2によるPrimPol依存的ミトコンドリアゲノム維持の新規制御機構2021

    • Author(s)
      加生 和寿, Anais Lamy, Andreas Berner, Tran Nguyen, Gorazd Stojkovic, Cristina Velazquez-Ruiz, Maria Isabel Martinez-Jimenez, Mara Doimo, Timothee Laurent, Aldo E. Perez-Rivera, Ronnie Berntsson, Luis Blanco, and Sjoerd Wanrooij
    • Organizer
      第44回 日本分子生物学会年会
    • Related Report
      2021 Research-status Report
  • [Remarks]

    • URL

      https://bunsei.phar.kyushu-u.ac.jp

    • Related Report
      2021 Research-status Report

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Published: 2021-10-22   Modified: 2024-01-30  

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