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Targeting autophagy to improve alcoholic liver disease

Research Project

Project/Area Number 18K15748
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionOsaka University

Principal Investigator

Sakane Sadatsugu  大阪大学, 医学部附属病院, 医員 (30817515)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsアルコール性肝障害 / オートファジー / 細胞死 / 脂肪蓄積 / 脂肪肝 / エタノール / エクソソーム
Outline of Final Research Achievements

Ethanol administration to cultured mouse hepatocytes resulted in enhanced apoptosis and lipid accumulation with supression of autophagy. This phenotype disappeared in the absence of Atg7, which is an autophagy essential protein, and was relieved by the autophagy enhancer rapamycin. However, the phenotype did not dissappeared in the absence of Rubicon, which is an autophagy inhibitor.
In two ethanol-loaded mouse models, enhanced apoptosis and hepatocyte lipid accumulation with suppression of autophagy in the liver were also observed. However, hepatocyte-specific Rubicon knockout mice showed no change in autophagy suppression, lipid accumulation, and hepatocyte apoptosis owing to alcohol treatment compared with wild type controls.

Academic Significance and Societal Importance of the Research Achievements

我々は過去に非アルコール性脂肪肝炎においてはオートファジー抑制タンパクRubiconが病態形成に関与し、Rubiconの抑制が非アルコール性脂肪肝炎を改善させることを報告した。本研究により、アルコール性肝障害においても非アルコール性脂肪肝炎同様にオートファジー抑制による肝脂肪蓄積および肝細胞死が生じていた一方で、アルコール性肝障害においてはRubiconの関与に乏しいことが明らかになった。今回明らかになったアルコール性肝障害と非アルコール性脂肪肝炎のオートファジー抑制機序の違いは、今後の脂肪肝治療を目指した研究において重要な知見となると考える。

Report

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

    (4 results)

All 2020 2019 2018

All Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Change of hepatocyte autophagy in alcoholic liver disease2020

    • Author(s)
      Hikita Hayato, Shirai Kumiko, Sakane Sadatsugu, Takehara Tetsuo
    • Organizer
      第39回アルコール医学生物学研究会学術集会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Rubicon-independent autophagy suppression causes liver injury in alcoholic liver disease.2019

    • Author(s)
      Kumiko Shirai, Hayato Hikita, Sadatsugu Sakane, Yoichi Sasaki, Shinnosuke Kudo, Kenji Fukumoto, Yuta Myojin, Takahiro Kodama, Ryotaro Sakamori, Tomohide Tatsumi and Tetsuo Takehara
    • Organizer
      The Liver Meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 脂肪性肝疾患の病態における肝細胞オートファジーの関与2018

    • Author(s)
      坂根 貞嗣、疋田 隼人、竹原 徹郎
    • Organizer
      第104回日本消化器病学会総会
    • Related Report
      2018 Research-status Report
  • [Presentation] アルコール性肝疾患と非アルコール性肝疾患における肝細胞オートファジーの違い2018

    • Author(s)
      白井 久美子、小玉 尚宏、竹原 徹郎
    • Organizer
      第54回日本肝臓学会総会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2021-02-19  

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