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Lysosomal stress as an emerging target in kidney disease

Research Project

Project/Area Number 18K08208
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53040:Nephrology-related
Research InstitutionOsaka University

Principal Investigator

Takabatake Yoshitsugu  大阪大学, 医学系研究科, 講師 (30403075)

Co-Investigator(Kenkyū-buntansha) 猪阪 善隆  大阪大学, 医学系研究科, 教授 (00379166)
高橋 篤史  大阪大学, 医学部附属病院, 助教 (10704786)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsリソソーム / オートファジー / 近位尿細管 / 虚血再灌流 / シュウ酸腎症 / TFEB / 結晶腎症 / リソソームストレス / LMP / オートファジーフラックス / 脂質代謝 / 尿細管 / 慢性腎臓病
Outline of Final Research Achievements

Autophagy plays an important role in protecting kidney from ischemia-reperfusion injury (IRI); however, in a later phase (48 hours after IRI), enlarged and dysfunctional (as suggested by a decrease in enzymatic activity) lysosomes were observed, which inhibited full activation of autophagy (referred to as “lysosomal stress”). We found that dysregulated lipid metabolism (especially lipid peroxidation) leads to lysosomal stress. PPARα administration alleviated lysosomal stress and IRI. Based on a hypothesis that modulating lysosomal activity alleviates lysosomal stress, we investigated the role of TFEB in various kidney disease models by analyzing TFEB knockout mice (KO mice). We found no difference between wildtype and KO mice subjected to IRI, but in oxalate nephropathy, kidney injury was more exaggerated in KO mice, suggesting that TFEB protects kidney from lysosomal stress during crystal nephropathy. Modulating TFEB activity may be a therapeutic option targeting kidney diseases.

Academic Significance and Societal Importance of the Research Achievements

本研究の結果から、IRIやシュウ酸腎症マウスモデルでは、リソソーム障害(傷害)がオートファジー活性化の阻害などを介して、病態を悪化させている、「リソソームストレス」とも呼ぶべき状態が存在することが判明した。リソソームストレスの特徴の一部は、ヒト腎移植後の腎臓でも認められ、臨床的にも意義を持つものと思われる。IRIの場合、脂質代謝異常がリソソームの機能異常の原因になっており、またノックアウトマウスを用いた実験からは、転写因子TFEBの活性調節がリソソームストレスの解除を介して腎保護につながるものと推測された。今後薬剤による脂質代謝異常の改善やTFEBの活性化が治療の選択肢になり得ると思われる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (4 results)

All 2020 Other

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

  • [Journal Article] LC3 lipidation is essential for TFEB activation during the lysosomal damage response to kidney injury2020

    • Author(s)
      Shuhei Nakamura et al.,
    • Journal Title

      Nature Cell Biology

      Volume: 22 Issue: 10 Pages: 1252-1263

    • DOI

      10.1038/s41556-020-00583-9

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 多面的な尿細管オートファジー2020

    • Author(s)
      中村隼
    • Organizer
      若手腎臓内科医のための腎臓基礎研究Cutting Edge
    • Related Report
      2020 Annual Research Report
  • [Remarks] 大阪大学腎臓内科HP

    • URL

      https://www.med.osaka-u.ac.jp/pub/kid/kid/research/autophagypub.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] Res OU (Research at Osaka University)

    • URL

      https://resou.osaka-u.ac.jp/ja/research/2020/20200929_1

    • Related Report
      2020 Annual Research Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

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