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Exploration of the cell population that repairs damaged proximal tubules

Research Project

Project/Area Number 19K17707
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Kitai Yuichiro  京都大学, 医学研究科, 医員 (90839771)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords腎修復 / 近管尿細管 / 障害度 / 幹細胞 / 近位尿細管 / 障害 / 修復 / 重症度 / 近位尿細管修復
Outline of Research at the Start

急性腎障害を発症するとその後慢性腎臓病や末期腎不全への進展の危険性が増加することが疫学研究で示されているが、急性腎障害の病態生理には不明な点が多く、有効な治療介入がなされていない。急性腎障害で最も障害されやすい近位尿細管では、障害後、近位尿細管上皮細胞自身が増殖することで修復を行うことが示されてきたが、この修復が特殊な細胞群の増殖によって行われるのか、あるいは、あらゆる近位尿細管上皮細胞のランダムな増殖によって行われるのかは不明である。本研究では近位位尿細管修復に関与する特殊な細胞群がいるのかどうかを明らかにすることを目的とした。

Outline of Final Research Achievements

Injured proximal tubules (PT) are restored by the proliferation of PT cells, but the influence of injury severity is uncertain. First, we showed highly proliferative capacity of superficial PT cells, after severe ischemia than in moderate ischemia. Recently, A Runx1 enhancer, Runx1+24mCNE (eR1) was identified as a marker of adult hematopoietic and gastric stem cells. We traced eR1-activated PT cells, using mice that can visualize eR1 activity. In uninjured kidneys and moderately injured kidneys, eR1-activated PT cells were almost absent. However, many PT cells with clonal expansion showed high eR1 activity only after severely injured kidneys. RNA-seq data showed a highly proliferative capacity of eR1-activated PT cells. In severe injury, clonal expansion of eR1-activated proximal tubular cells contributes to the regeneration of superficial proximal tubules.

Academic Significance and Societal Importance of the Research Achievements

近位尿細管は腎臓全体の約6割を占め、急性腎障害の際に強く障害される。近位尿細管障害後、近位尿細管は近位尿細管細胞の増殖によって修復されることが知られているが、修復の主体となる細胞群は明らかにされていない。障害時に優先的に修復に関わる細胞群が同定できれば、腎臓の再生修復の分野の発展に寄与できる可能性がある。当研究で得られた、重度障害でのみ強く増殖する一群がいるという結果は、新しい視点から尿細管修復機構を追究できる可能性を示唆している。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (8 results)

All 2021 2020 2019

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

  • [Journal Article] Aging-related kidney diseases2021

    • Author(s)
      Kitai Y, Nangaku M, Yanagita M.
    • Journal Title

      Contributions to Nephrology

      Volume: 199 Pages: 266-273

    • DOI

      10.1159/000517708

    • ISBN
      9783318069365, 9783318069372
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Myofibroblasts acquire retinoic acid?producing ability during fibroblast-to-myofibroblast transition?following kidney injury2019

    • Author(s)
      Nakamura Jin、Sato Yuki、Kitai Yuichiro、Wajima Shuichi、Yamamoto Shinya、Oguchi Akiko、Yamada Ryo、Kaneko Keiichi、Kondo Makiko、Uchino Eiichiro、Tsuchida Junichi、Hirano Keita、Sharma Kumar、Kohno Kenji、Yanagita Motoko
    • Journal Title

      Kidney International

      Volume: 95 Issue: 3 Pages: 526-539

    • DOI

      10.1016/j.kint.2018.10.017

    • NAID

      120006550402

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 腎臓の機能成熟と障害抵抗性のパラドックス2019

    • Author(s)
      北井悠一朗、佐藤有紀、小口綾貴子、柳田素子
    • Organizer
      第23回日本心血管内分泌学会学術総会
    • Related Report
      2019 Research-status Report
  • [Presentation] Transiently Dedifferentiated eR1-Active Proximal Tubule Cells Clonally Expand and Repair Proximal Tubules in Severe Injury2019

    • Author(s)
      Kitai Y, Yanagita M
    • Organizer
      American Society of Nephrology Kidney Week 2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 重度の腎障害では、RUNX1エンハンサー eR1が活性化した近位尿細管細胞が強く増殖し、近位尿細管を修復する2019

    • Author(s)
      北井悠一朗、大里元美、柳田素子
    • Organizer
      第40回日本炎症・再生医学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 腎臓の機能成熟と障害抵抗性のパラドックス2019

    • Author(s)
      北井悠一朗、佐藤有紀、小口綾貴子、村川泰裕、柳田素子
    • Organizer
      第62回日本腎臓学会総会
    • Related Report
      2019 Research-status Report
  • [Presentation] 重度障害では、RUNX1エンハンサー_eR1が活性化した近位尿細管上皮細胞が強く増殖し、近位尿細管を修復する2019

    • Author(s)
      北井悠一朗、柳田素子
    • Organizer
      第61回日本腎臓学会総会
    • Related Report
      2019 Research-status Report
  • [Book] Acute kidney injury and regenerative medicine2020

    • Author(s)
      Kitai Y, Yanagita M
    • Total Pages
      6
    • Publisher
      Springer Singapore
    • ISBN
      9789811511080
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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