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Investigation of the new role of autophagy in the loss of lysosomal protease

Research Project

Project/Area Number 20K22744
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0802:Biomedical structure and function and related fields
Research InstitutionJuntendo University

Principal Investigator

Yamaguchi Junji  順天堂大学, 大学院医学研究科, 助教 (30875282)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsカテプシンD / オートファジー / 神経性セロイドリポフスチン症 / p62 / NBR1 / リソソーム / Atg7 / 電子顕微鏡
Outline of Research at the Start

神経性セロイドリポフスチン症(NCL)の神経細胞内にはリポフスチン顆粒を有する異常リソソームが蓄積するが、それらは選択的オートファジーにより処理されている可能性が示唆される。本研究課題では、NCLにおけるオートファジーの役割を明らかにすることを目的に、NCL病態モデルマウスであるカテプシンD(CTSD)欠損マウスとオートファジー機能不全マウスの中枢神経系特異的ダブルノックアウトマウス(CTSD/Atg7 Nestin Cre)を作成して、オートファジー機能不全条件下でのNCL病態変化についての解析を進める。

Outline of Final Research Achievements

Cathepsin D (CTSD), a major lysosomal aspartic protease, is a causative gene of neuronal ceroid lipofuscinosis (NCL), characterized as one of lysosomal storage diseases. In this study, I investigated the relation between autophagy and the abnormal lysosomes accumulated in neurons of CTSD-deficient mice. We found that p62 and NBR1 were degraded normally via autophagy / lysosome pathway even in CTSD-deficient cells, while these proteins were increased and accumulated on the surface of abnormal lysosomes observed in CTSD-deficient neurons. Furthermore, from the investigation using CTSD / Atg7 Nestin-Cre mice, it was suggested that the abnormal lysosomes were enclosed by autophagosomes in CTSD-deficient neurons. These results have important implications for understanding the pathogenesis of NCL and the precise mechanism for selective autophagy of defective lysosomes. We are currently preparing a paper on these results.

Academic Significance and Societal Importance of the Research Achievements

NCLは神経細胞内に異常なリソソームを蓄積する神経変性疾患の一種であり、その機序については未だ不明な点も多い。近年、NCLとオートファジーの関係についていくつかの報告があるが、その多くはオートファジー機能不全やリソソーム内での分解障害を示唆する内容である。本研究では、NCLで誘導されるオートファジーが不良リソソームの品質管理に働いている可能性を示した。細胞内不良オルガネラを標的にした選択的オートファジーは過去に多く報告されているが、その中で生体内での現象について示した例は未だ多くない。本研究はNCLの病態だけでなく、生体内での選択的オートファジーを理解する上で重要な意味を持つ。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2020

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (1 results)

  • [Journal Article] Membranous Structures Directly Come in Contact With p62/SQSTM1 Bodies2021

    • Author(s)
      Tanida Isei、Haruta Tomohiro、Suga Mitsuo、Takei Shunsuke、Takebe Akira、Furuta Yoko、Yamaguchi Junji、Oliva Trejo Juan Alejandro、Kakuta Soichiro、Uchiyama Yasuo
    • Journal Title

      Journal of Histochemistry & Cytochemistry

      Volume: 69 Issue: 6 Pages: 407-414

    • DOI

      10.1369/00221554211011423

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Three-Dimensional Architecture of Glomerular Endothelial Cells Revealed by FIB-SEM Tomography2021

    • Author(s)
      Kawasaki Yuto、Hosoyamada Yasue、Miyaki Takayuki、Yamaguchi Junji、Kakuta Soichiro、Sakai Tatsuo、Ichimura Koichiro
    • Journal Title

      Frontiers in Cell and Developmental Biology

      Volume: 9 Pages: 653472-653472

    • DOI

      10.3389/fcell.2021.653472

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Homeostatic p62 levels and inclusion body formation in CHCHD2 knockout mice2021

    • Author(s)
      Sato Shigeto、Noda Sachiko、Torii Satoru、Amo Taku、Ikeda Aya、Funayama Manabu、Yamaguchi Junji、Fukuda Takahiro、Kondo Hiromi、Tada Norihiro、Arakawa Satoko、Watanabe Masahiko、Uchiyama Yasuo、Shimizu Shigeomi、Hattori Nobutaka
    • Journal Title

      Human Molecular Genetics

      Volume: 30 Issue: 6 Pages: 443-453

    • DOI

      10.1093/hmg/ddab057

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Two-color in-resin CLEM of Epon-embedded cells using osmium resistant green and red fluorescent proteins2020

    • Author(s)
      Tanida Isei、Furuta Yoko、Yamaguchi Junji、Kakuta Soichiro、Oliva Trejo Juan Alejandro、Uchiyama Yasuo
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 21871-21871

    • DOI

      10.1038/s41598-020-78879-x

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 中枢神経系特異的CTSD / Atg7両欠損マウスを用いた神経細胞内不良リソソームの品質管理機構の解明2022

    • Author(s)
      山口 隼司、鈴木ちぐれ、角田宗一郎、眞田貴人、三井駿、谷田以誠、内山安男
    • Organizer
      第127回日本解剖学会総会・全国学術集会
    • Related Report
      2021 Annual Research Report

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Published: 2020-09-29   Modified: 2023-01-30  

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