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Physiological significance of mTORC2 in the proximal tubule

Research Project

Project/Area Number 21K08248
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53040:Nephrology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Nakamura Motonobu  東京大学, 医学部附属病院, 講師 (40459524)

Co-Investigator(Kenkyū-buntansha) 堀田 晶子  帝京大学, 医学部附属病院, 講師 (20534895)
佐藤 信彦  東京大学, 医学部附属病院, 講師 (80572552)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords近位尿細管 / ナトリウム再吸収 / 腎保護 / mTOR / mTORC2 / 腎障害 / 糖尿病 / SGLT2 / ナトリウム
Outline of Research at the Start

SGLT2阻害剤による糖尿性腎症の進展抑制が近年の大規模臨床試験により示された。その機序の一つとして、SGLT2阻害剤によるケトン体産生が、近位尿細管のmTORC1活性を抑制し、DMNの進展を抑制することや、糖尿病性腎症の進展にmTORC1の関与が示唆されているが、mTORC1阻害剤の腎保護効果は限定的である。最近、mTORC2と腎保護の関連が示唆されているが、mTORC2の生理的な意義には不明な点が多い。本研究の目的は、SGLT2阻害剤の腎保護効果に着目し、未解明である近位尿細管におけるmTORC2の生理的な意義の解明を通じて、糖尿病性腎症の進展機序と進展抑制因子を解明することである。

Outline of Final Research Achievements

Resveratrol (RSV), a natural compound, is one of the polyphenols, which has been reported to reduce inflammation, have anti-cancer, anti-oxidant, and anti-aging effects in both in vitro and in vivo studies, however, its effects in the proximal tubules and on kidney disease are unknown. In the present study, we used isolated proximal tubules (PTs) and rat models to examine the effects of RSV on its effects on the PTs, and its inhibitory effects on the progression of renal injury.
As a result, RSV inhibits insulin-induced sodium reabsorption in PTs, suggesting that it could have a renoprotective effect.

Academic Significance and Societal Importance of the Research Achievements

mTORC2の腎近位尿細管における役割や意義については、不明な点が多い。今回、我々は、レスベラトロールは近位尿細管において、mTORC2を抑制することによりインスリンによるNa再吸収亢進作用を抑制すること、in vvoの検証においてレスベラトロールが腎保護作用を有する可能性を見出したことから、インスリン/mTORC2経路は、腎近位尿細管において、腎障害進展と関連している可能性がある。従って、この経路を標的とした腎臓病の治療につながる可能性があり、糖尿病性腎症の進展を抑制する次世代の治療法を見出すことができれば、末期腎不全の進展をさらに抑制することができると考えられる。

Report

(3 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (4 results)

All 2023 2022

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Insulin-induced mTOR signaling and gluconeogenesis in renal proximal tubules: A mini-review of current evidence and therapeutic potential2022

    • Author(s)
      Nakamura Motonobu、Satoh Nobuhiko、Horita Shoko、Nangaku Masaomi
    • Journal Title

      Frontiers in Pharmacology

      Volume: 13 Pages: 01-10

    • DOI

      10.3389/fphar.2022.1015204

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Oxidized alkyl phospholipids stimulate sodium transport in proximal tubules via a nongenomic PPARγ-dependent pathway2022

    • Author(s)
      Tomohito Mizuno, Nobuhiko Satoh, Shoko Horita, Hiroyuki Tsukada, Mayuko Takagi, Yusuke Sato, Haruki Kume, Masaomi Nangaku, Motonobu Nakamura
    • Journal Title

      Journal of Biological Chemistry

      Volume: 298 Issue: 3 Pages: 101681-101691

    • DOI

      10.1016/j.jbc.2022.101681

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Snapshots of nascent RNA can validate different nephron segment responses in acute kidney injury: a step toward clinically useful biomarkers?2022

    • Author(s)
      Nakamura Motonobu、Nangaku Masaomi
    • Journal Title

      Kidney International

      Volume: 102 Issue: 4 Pages: 678-680

    • DOI

      10.1016/j.kint.2022.06.004

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Combining MR blockers with SGLT2 inhibitors prevent MR blocker-induced hyperkalemia via regulation of TWIK1 and TASK2 in the proximal tubule2023

    • Author(s)
      Nakamura Motonobu
    • Organizer
      International Society of Nephrology (ISN) World Congress of Nephrology 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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