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Temsirolimus Is a Candidate of the Optimal mTOR Inhibitor in Human Intervertebral Disc Nucleus Pulposus Cells

Research Project

Project/Area Number 21K16685
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56020:Orthopedics-related
Research InstitutionKobe University

Principal Investigator

Kakiuchi Yuji  神戸大学, 医学研究科, 医学研究員 (40849212)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsオートファジー / 椎間板 / mTORC1阻害 / 椎間板変性 / mTOR / 脊椎
Outline of Research at the Start

椎間板は低栄養、低酸素の環境下に置かれており、椎間板変性をきたすことにより細胞外基質の分解や細胞死、細胞老化を起こすと報告されている。我々のグループは椎間板髄核細胞の生存、変性の予防にはオートファジーとそれを制御するmTORシグナル経路が重要な役割を担っていると考えた。そこで我々は細胞実験で、ヒト椎間板髄核細胞においてmTORC1阻害薬であるテムシロリムスによるmTORC1阻害がオートファジーの活性とAktの亢進をきたし、椎間板保護作用を来すことを報告した。今回、テムシロリムスの将来的な臨床応用に向けて、我々が確立した創外固定によるラット尾椎椎間板変性モデルを用いた動物実験を検討している。

Outline of Final Research Achievements

an in-vivo study was designed to clarify effects of mTORC1 modulation by Raptor RNAi in a rat tail model of intervertebral disc degeneration induced by temporary static compression. In-vivo intradiscal RNAi knockdown of Raptor demonstrated enhanced cellular autophagy, inhibited apoptotic cell death and senescent cell aging, radiographic height loss, and histological degeneration, indicating disc cell and matrix-protective effects. On the other hand, for degenerated discs induced by prior compressive load, the effects of RNAi were relatively limited.

Academic Significance and Societal Importance of the Research Achievements

本研究でラットの尾椎椎間板においてmTORC1を阻害することによりオートファジーの誘導や細胞死・細胞老化の抑制、細胞外基質分解抑制などを介して椎間板保護作用を生じる可能性が示唆された。腰痛は世界的な健康問題の一つであり、椎間板変性と深い関連がある。本研究のように椎間板内への注射による治療で椎間板変性を抑制し椎間板機能を温存できる可能性が示唆された。

Report

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

    (9 results)

All 2024 2023 2022

All Presentation (9 results) (of which Int'l Joint Research: 4 results)

  • [Presentation] Selective RNA interference of Raptor/mTORC1 protects against the progression of intervertebral disc degeneration through the induction of autophagy in a rat tail temporary static compression model2024

    • Author(s)
      熊谷直利
    • Organizer
      The 70th Annual Meeting, Orthopaedic Research Society
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ラット尾椎椎間板におけるRaptor/mTORC1への選択的なRNA遺伝子干渉はオートファジーを誘導するとともに椎間板変性進行に抑制的に作用する2023

    • Author(s)
      熊谷直利
    • Organizer
      第52回日本脊椎脊髄病学会学術集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Selective interference of Raptor/mTORC1 protects against the progression of intervertebral disc degeneration through autophagy induction in a rat tail temporary static compression model2023

    • Author(s)
      熊谷直利
    • Organizer
      The 50th Annual Meeting, The International Society for the Study of the Lumbar Spine
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] mTORシグナル経路への選択的なRNA干渉はラット尾椎椎間板組織において変性抑止効果を有する2023

    • Author(s)
      熊谷直利
    • Organizer
      第38回日本整形外科学会基礎学術集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] CRISPR Cas9 versus RNA interference for degenerative disc disease treatment by the selective inhibition of mTOR signaling2023

    • Author(s)
      劉正夫
    • Organizer
      日本軟骨代謝学会
    • Related Report
      2022 Research-status Report
  • [Presentation] ラット尾椎椎間板におけるRaptor/mTORC1への選択的なRNA遺伝子干渉はオートファジーを誘導するとともに椎間板変性進行に抑制的に作用する2023

    • Author(s)
      熊谷直利
    • Organizer
      日本脊椎脊髄病学会学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] Selective interference of Raptor/mTORC1 protects against the progression of intervertebral disc degeneration through autophagy induction in a rat tail temporary static compression model2023

    • Author(s)
      熊谷直利
    • Organizer
      The 49th ISSLS annual meeting
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of treatment for intervertebral disc degeneration by selective interference of the mTOR signaling pathway using the CRISPR Cas9 system2022

    • Author(s)
      劉正夫
    • Organizer
      BioSpine Japan
    • Related Report
      2022 Research-status Report
  • [Presentation] Development of treatment for degenerative disc disease by the selective gene silencing of mTOR signaling using the RNA interference and CRISPR Cas9 systems2022

    • Author(s)
      劉正夫
    • Organizer
      Annual Meeting, Orthopaedic Research Society
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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

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