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Elucidation of Cancer-Promoting Mechanisms Through mTORC1-Dependent Regulation of Liquid-Liquid Phase Separation

Research Project

Project/Area Number 21K07155
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 50010:Tumor biology-related
Research InstitutionNagoya City University

Principal Investigator

Nakatsumi Hirokazu  名古屋市立大学, 医薬学総合研究院(薬学), 准教授 (20596837)

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: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsmTORC1 / P-body / Translation / 液ー液相分離 / シグナル伝達
Outline of Research at the Start

「液-液相分離」は特定のタンパク質とRNAが集合し、液滴と呼ばれる膜のない細胞内構造体を可逆的に形成することで、細胞機能を制御する重要な現象である。液-液相分離研究は未だ解析法の整備が不十分であり、分野の進展の足枷となっている。申請者はこれを解決するため、細胞内の液―液相分離の変化を検出するDroplet-TPP法を開発した。本研究では、リン酸化酵素mTORC1の下流で液-液相離が制御されることにより、がん促進がもたらされるという仮説に基づき、Droplet-TPP法を用いたmTORC1の下流シグナル解析から、新たながん促進機構を解明し創薬標的の同定を目指す。

Outline of Final Research Achievements

In this study, we identified that the liquid-liquid phase separation of P-bodies is regulated by the phosphorylation enzyme mTORC1. Results from ribosome profiling and proteome analysis revealed that mTORC1 promotes the translation of mRNAs localized in P-bodies. While it was previously known that mTORC1 controls translation by targeting ribosomal proteins, the regulation discovered in this study targets different mRNAs and is independent of the known signaling pathways. Although P-bodies have been known to function in translational repression, our research indicates that the formation of P-bodies functions to promote the translation of specific groups of mRNAs.

Academic Significance and Societal Importance of the Research Achievements

mTORC1の異常活性化はがんをはじめとした様々な疾患を増悪させる。mTORC1の阻害剤であるラパマイシンは抗がん剤として既に使用されているが、未だ改善の余地を残している。mTORC1の分子機能の詳細を解明することは、関連疾患の治療法の開発や、ラパマイシンの副作用の低減に寄与しうる。本研究ではこれらの分子機能の一端を明らかにし、タンパク質合成に関連した新たな制御機構を明らかにした。

Report

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

    (8 results)

All 2023 2022

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (3 results) (of which Invited: 3 results)

  • [Journal Article] A stepwise and digital pattern of RSK phosphorylation determines the outcome of thymic selection2023

    • Author(s)
      Funasaki Shintaro、Hatano Atsushi、Nakatsumi Hirokazu、Koga Daisuke、Sugahara Osamu、Yumimoto Kanae、Baba Masaya、Matsumoto Masaki、Nakayama Keiichi I.
    • Journal Title

      iScience

      Volume: 26 Issue: 9 Pages: 107552-107552

    • DOI

      10.1016/j.isci.2023.107552

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] FOXK1 promotes nonalcoholic fatty liver disease by mediating mTORC1-dependent inhibition of hepatic fatty acid oxidation.2023

    • Author(s)
      Fujinuma S, Nakatsumi H, Shimizu H, Sugiyama S, Harada A, Goya T, Tanaka M, Kohjima M, Takahashi M, Izumi Y, Yagi M, Kang D, Kaneko M, Shigeta M, Bamba T, Ohkawa Y, Nakayama KI*.
    • Journal Title

      Cell Reports

      Volume: 42(5) Issue: 5 Pages: 112530-112530

    • DOI

      10.1016/j.celrep.2023.112530

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phosphorylation of PBX2, a novel downstream target of mTORC1, is determined by GSK3 and PP12022

    • Author(s)
      Wada Reona、Fujinuma Shun、Nakatsumi Hirokazu、Matsumoto Masaki、Nakayama Keiichi I
    • Journal Title

      The Journal of Biochemistry

      Volume: 173 Issue: 2 Pages: 129-138

    • DOI

      10.1093/jb/mvac094

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Senescence Connects Autophagy Deficiency to Inflammation and Tumor Progression in the Liver2022

    • Author(s)
      Huda Nazmul、Khambu Bilon、Liu Gang、Nakatsumi Hirokazu、Yan Shengmin、Chen Xiaoyun、Ma Michelle、Dong Zheng、Nakayama Keiichi I.、Yin Xiao-Ming
    • Journal Title

      Cellular and Molecular Gastroenterology and Hepatology

      Volume: 14 Issue: 2 Pages: 333-355

    • DOI

      10.1016/j.jcmgh.2022.04.003

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spatiotemporal reprogramming of differentiated cells underlies regeneration and neoplasia in the intestinal epithelium2022

    • Author(s)
      Higa Tsunaki、Okita Yasutaka、Matsumoto Akinobu、Nakayama Shogo、Oka Takeru、Sugahara Osamu、Koga Daisuke、Takeishi Shoichiro、Nakatsumi Hirokazu、Hosen Naoki、Robine Sylvie、Taketo Makoto M.、Sato Toshiro、Nakayama Keiichi I.
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 1500-1500

    • DOI

      10.1038/s41467-022-29165-z

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] mTORC1はP-bodyに局在するmRNAの翻訳を制御する2023

    • Author(s)
      中津海洋一
    • Organizer
      日本プロテオーム学会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] mTOR-dependent Regulation of Liquid-Liquid Phase Separation and Translation2023

    • Author(s)
      Hirokazu Nakatsumi
    • Organizer
      日本生物物理学会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] mTOR-dependent Regulation of Liquid-Liquid Phase Separation and Translation2023

    • Author(s)
      Hirokazu Nakatsumi
    • Organizer
      日本分子生物学会
    • Related Report
      2023 Annual Research Report
    • Invited

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

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