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Elucidation of the effect of mitochondrial DNA release by Bak/Bax activation on chronic liver disease

Research Project

Project/Area Number 17K09423
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Gastroenterology
Research InstitutionOsaka University

Principal Investigator

Hikita Hayato  大阪大学, 医学系研究科, 助教 (20623044)

Co-Investigator(Kenkyū-buntansha) 阪森 亮太郎  大阪大学, 医学系研究科, 助教 (10644685)
巽 智秀  大阪大学, 医学系研究科, 講師 (20397699)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords肝細胞死 / アポトーシス / 非アポトーシス型細胞死 / ミトコンドリアDNA / 肝細胞 / DNase II / 消化器内科学 / 肝臓学 / 慢性肝疾患
Outline of Final Research Achievements

Apoptotic stimuli release mitochondrial DNA (mtDNA) from mitochondria. Under the DNase II activity decreased condition, mtDNA in the cytoplasm increased, IFN-β expression increased via TRL9, resulted in induction of non-apoptotic hepatocyte death.
In the liver of mice fed a high-fat diet, DNase II activity was reduced and non-apoptotic hepatocyte death was observed along with hepatocyte apoptosis. DNase II deficiency in hepatocytes of them increased non-apoptotic hepatocyte death and serum ALT levels, and exacerbated liver fibrosis. DNase II activity was also reduced in the livers of patients with non-alcoholic fatty liver disease.

Academic Significance and Societal Importance of the Research Achievements

本研究により、非アルコール性脂肪性肝疾患患者ではDNase II活性の低下を認めており、これがIFN-β発現上昇、IFN非アポトーシス型肝細胞死を誘導し、病態進展に寄与することが示唆された。
肝細胞のアポトーシス刺激がmtDNAを介して非アポトーシス型肝細胞死を誘導する経路の存在とそのヒト肝疾患における意義を明らかにした成果であり、学術的な意義は高いと考える。また、今後非アルコール性脂肪性肝疾患の進展抑制治療として、mtDNAによる非アポトーシス型細胞死誘導経路を標的とした治療薬の開発などにもつながり、臨床的にも意義の高い成果と考える。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (11 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (9 results) (of which Int'l Joint Research: 2 results) Book (1 results)

  • [Journal Article] DNase II activated by the mitochondrial apoptotic pathway regulates RIP1-dependent non-apoptotic hepatocyte death via the TLR9/IFN-β signaling pathway2018

    • Author(s)
      Saito Yoshinobu、Hikita Hayato、Nozaki Yasutoshi、Kai Yugo、Makino Yuki、Nakabori Tasuku、Tanaka Satoshi、Yamada Ryoko、Shigekawa Minoru、Kodama Takahiro、Sakamori Ryotaro、Tatsumi Tomohide、Takehara Tetsuo
    • Journal Title

      Cell Death & Differentiation

      Volume: 26 Issue: 3 Pages: 470-486

    • DOI

      10.1038/s41418-018-0131-6

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ミトコンドリアDNA分解酵素活性の低下による非アポトーシス型細胞死の誘導2019

    • Author(s)
      疋田隼人
    • Organizer
      肝臓と糖尿病・代謝研究会
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 慢性肝疾患におけるマクロファージ由来TNF-αは肝細胞における非アポトーシス型の肝細胞死誘導と酸化ストレス誘導により肝発癌を促進する2019

    • Author(s)
      齋藤 義修,疋田 隼人,工藤 慎之輔,野崎 泰俊,牧野 祐紀,中堀 輔,山田涼子,小玉 尚宏,阪森 亮太郎,巽 智秀,竹原 徹郎
    • Organizer
      第55回日本肝臓学会総会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 持続的肝細胞アポトーシスは、酸化ストレス依存的にジエチルニトロサミンによるDNA損傷を持続させ腫瘍形成を促進させる2019

    • Author(s)
      野﨑泰俊、疋田隼人、田中聡司、水谷直揮、明神悠太、坂根貞嗣、 牧野祐紀、中堀輔、齋藤義修、小玉尚宏、阪森亮太郎、巽智秀、竹原徹郎
    • Organizer
      第55回日本肝臓学会総会
    • Related Report
      2019 Annual Research Report
  • [Presentation] DNase II Activated by the mitochondrial apoptotic pathway regulates RIP-1 dependent hepatocyte non-apoptotic cell death via the TLR9/IFN-β2018

    • Author(s)
      Yoshinobu Saito, Hayato Hikita, Tetsuo Takehara
    • Organizer
      Australia-Japan Meeting on Cell Death
    • Related Report
      2018 Research-status Report
  • [Presentation] 肝細胞DNase IIはアポトーシス刺激下においてTLR9/IFN-β経路を介した非アポトーシス細胞死を制御する2018

    • Author(s)
      齋藤 義修,疋田 隼人,甲斐 優吾,野崎 泰俊,牧野 祐紀,中堀 輔,小玉 尚宏,阪森 亮太郎,巽 智秀,竹原 徹郎
    • Organizer
      第54回 日本肝臓学会総会
    • Related Report
      2018 Research-status Report
  • [Presentation] NAFLDの病態における肝細胞DNaseIIの役割2017

    • Author(s)
      齋藤 義修,疋田 隼人,甲斐 優吾,野崎 泰俊,牧野 祐紀,中堀 輔,田中 聡司,小玉 尚宏,阪森 亮太郎,巽 智秀,竹原 徹郎
    • Organizer
      第59回日本消化器病学会
    • Related Report
      2017 Research-status Report
  • [Presentation] DNA分解酵素DNase IIの活性低下による脂肪性肝疾患の病態進展2017

    • Author(s)
      齋藤 義修,疋田 隼人,竹原 徹郎
    • Organizer
      第54回 日本肝臓学会大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 肝細胞DNaseⅡ活性の低下は、肝細胞ネクローシスを誘導し非アルコール性肝疾患の病態進展に寄与する2017

    • Author(s)
      疋田 隼人,齋藤 義修,竹原 徹郎
    • Organizer
      第26回日本Cell Death学会学術集会
    • Related Report
      2017 Research-status Report
  • [Presentation] Suppression of DNase II activity in fatty livers contributes to induction of RIP1-dependent hepatocyte necrosis through TLR9-IFNβ pathway.2017

    • Author(s)
      Yoshinobu Saito, Hayato Hikita, Yasutoshi Nozaki, Yugo Kai, Yuki Makino, Tasuku Nakabori, Minoru Shigekawa, Takahiro Kodama, Ryotaro Sakamori, Tomohide Tatsumi, Tetsuo Takehara
    • Organizer
      AASLD 2017 The Liver meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Book] Regulation of apoptosis by Bcl-2 Family proteins in liver injury, Molecules, Systems and Signaling in Liver Injury2017

    • Author(s)
      Hayato Hikita、Tetsuo Takehara
    • Publisher
      Springer
    • ISBN
      9783319581057
    • Related Report
      2017 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

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