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Studies on the functions and intracellular transport mechanisms of lipids involved in the formation of cell membrane structure

Research Project

Project/Area Number 19H03227
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 44010:Cell biology-related
Research InstitutionKyushu University

Principal Investigator

Ikenouchi Junichi  九州大学, 理学研究院, 教授 (10500051)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2021: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2020: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2019: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywordsスフィンゴミエリン / アピカル膜 / 上皮細胞 / 微絨毛 / mTORC2シグナル / Rab35 / 低浸透圧ストレス / 細胞死 / mTOR / 細胞間接着 / 極性輸送 / 細胞間接着装置 / コレステロール / タイトジャンクション / 細胞膜 / クローディン / αカテニン / バリア機能
Outline of Research at the Start

上皮細胞には、外界からの栄養吸収を担う細胞膜構造である微絨毛や上皮細胞同士の結合や情報伝達の場として機能する細胞接着装置などの細胞膜構造が存在する。申請者はこれらの膜構造形成において、膜タンパク質の集合・離散の制御にスフィンゴミエリンやコレステロールなどの脂質が重要な役割を果たしていることをこれまでの研究で明らかにした。本研究提案では、上皮細胞における細胞膜構造形成を可能にする細胞内でのスフィンゴミエリンやコレステロールの機能やこれらの脂質の細胞内輸送・局在化の分子機構の解明を通して細胞膜構造の構築メカニズムの解明を目指す。

Outline of Final Research Achievements

In this research project, I elucidated the molecular mechanism that controls the intracellular transport of sphingomyelin, a lipid involved in the formation of membrane structures of epithelial cells. Lysenin, a protein derived from Eisenia fetida that specifically binds to sphingomyelin, was modified to create a probe for visualizing the process of transport of sphingomyelin to the apical membrane. We performed the inhibitor library screening on cells that stably express this probe. We revealed that the mTORC2 pathway regulates the intracellular transport process of sphingomyelin. Furthermore, we found that the small G protein Rab35 is activated in the downstream of the mTORC2 pathway and regulates the transport of sphingomyelin to the apical membrane.

Academic Significance and Societal Importance of the Research Achievements

mTORC2シグナル伝達経路は、細胞の増殖や細胞の運動に関わるシグナル伝達経路で、最近では、がん細胞の悪性化との関連が示唆されています。本研究によって、mTORC2シグナル伝達経路は、細胞膜脂質のスフィンゴミエリンの輸送を制御するという新たな役割を担っていることが明らかになりました。この発見は、上皮細胞に由来する様々な疾患に対する新たな治療法を開発する上で基礎となる知見です。

Report

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

    (19 results)

All 2022 2021 2020 2019 Other

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (11 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results) Remarks (2 results)

  • [Journal Article] Tricellulin secures the epithelial barrier at tricellular junctions by interacting with actomyosin2022

    • Author(s)
      Cho Yuma、Haraguchi Daichi、Shigetomi Kenta、Matsuzawa Kenji、Uchida Seiichi、Ikenouchi Junichi
    • Journal Title

      Journal of Cell Biology

      Volume: 221 Issue: 4

    • DOI

      10.1083/jcb.202009037

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] mTORC2 suppresses cell death induced by hypo-osmotic stress by promoting sphingomyelin transport2022

    • Author(s)
      Ono Yumiko、Matsuzawa Kenji、Ikenouchi Junichi
    • Journal Title

      Journal of Cell Biology

      Volume: 221 Issue: 4

    • DOI

      10.1083/jcb.202106160

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] STIM-Orai1 signaling regulates fluidity of cytoplasm during membrane blebbing2021

    • Author(s)
      Aoki Kana、Harada Shota、Kawaji Keita、Matsuzawa Kenji、Uchida Seiichi、Ikenouchi Junichi
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 1-13

    • DOI

      10.1038/s41467-020-20826-5

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] MAGIs regulate aPKC to enable balanced distribution of intercellular tension for epithelial sheet homeostasis2021

    • Author(s)
      Matsuzawa Kenji、Ohga Hayato、Shigetomi Kenta、Shiiya Tomohiro、Hirashima Masanori、Ikenouchi Junichi
    • Journal Title

      Communications Biology

      Volume: 4 Issue: 1 Pages: 1-11

    • DOI

      10.1038/s42003-021-01874-z

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Coordinated changes in cell membrane and cytoplasm during maturation of apoptotic bleb.2020

    • Author(s)
      Aoki K, Satoi S, Harada S, Uchida S, Iwasa Y, Ikenouchi J
    • Journal Title

      Mol Biol Cell.

      Volume: 31 Issue: 8 Pages: 833-844

    • DOI

      10.1091/mbc.e19-12-0691

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cell Adhesion Structures in Epithelial Cells Are Formed in Dynamic and Cooperative Ways.2019

    • Author(s)
      Shigetomi K, Ikenouchi J
    • Journal Title

      Bioessays.

      Volume: 41 Issue: 7 Pages: 1800227-1800227

    • DOI

      10.1002/bies.201800227

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] ブレブの動的な振る舞いを制御する分子機構2021

    • Author(s)
      池ノ内 順一、青木 佳南
    • Organizer
      第73回日本細胞生物学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 上皮細胞シートにおける Tricellulin による三細胞間接着の形成機構2021

    • Author(s)
      長 佑磨、池ノ内 順一
    • Organizer
      第73回日本細胞生物学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] MAGI-ASPP を介した細胞の収縮力調節による上皮細胞シートの恒常性維持機構2021

    • Author(s)
      松沢 健司、池ノ内 順一
    • Organizer
      第73回日本細胞生物学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] タイトジャンクション領域における細胞膜脂質の集積機構2021

    • Author(s)
      重富 健太、池ノ内 順一
    • Organizer
      第73回日本細胞生物学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 上皮細胞において mTORC2経路はアピカル膜へのスフィンゴミエリンの輸送を促進することで低浸透圧による細胞死を 抑制する2021

    • Author(s)
      小野 由美子、池ノ内 順一
    • Organizer
      第73回日本細胞生物学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Roles of membrane lipids in tight junction formation2021

    • Author(s)
      Junichi Ikenouchi
    • Organizer
      4th International TJ Conference 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Roles of membrane lipids in tight junction formation2021

    • Author(s)
      Junichi Ikenouchi
    • Organizer
      第51回 生理研国際シンポジウム Frontiers in Epithelial Cell Biology
    • Related Report
      2021 Annual Research Report
  • [Presentation] Molecular mechanisms underlying dynamic behavior of membrane blebbing2020

    • Author(s)
      池ノ内順一
    • Organizer
      第58回日本生物物理学会年会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Reciprocal regulation of Adherens Junction and Tight Junction during the assembly of apical adhesion complex2020

    • Author(s)
      池ノ内順一
    • Organizer
      第43回日本分子生物学会年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ブレブの動的な振る舞いを制御する分子機構2019

    • Author(s)
      池ノ内順一
    • Organizer
      第92回日本生化学会大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Reciprocal Regulation of AJ and TJ During the Assembly of Apical Adhesion Complex2019

    • Author(s)
      Junichi Ikenouchi
    • Organizer
      Gordon Research Conference "Cell Contact and Adhesion"
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 九州大学理学部生物学科代謝生理学研究室ホームページ

    • URL

      http://www.biology.kyushu-u.ac.jp/~taisha/

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] 九州大学理学部生物学科代謝生理学研究室ホームページ

    • URL

      http://www.biology.kyushu-u.ac.jp/~taisha/ikelab/

    • Related Report
      2019 Annual Research Report

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

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