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Elucidation of extracellular matrix stiffness-dependent cell proliferation signaling pathways in breast cancer subtypes.

Research Project

Project/Area Number 21K15503
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 50010:Tumor biology-related
Research InstitutionOsaka University

Principal Investigator

Ichikawa Ayaka  大阪大学, 蛋白質研究所, 助教 (70869106)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords乳がん / がん微小環境 / 転写制御 / 細胞増殖 / ErbBシグナル伝達系
Outline of Research at the Start

乳がんの発症部位となる乳腺組織の周囲にはコラーゲンなどの細胞外マトリックス(Extracellular Matrix : ECM)が多く存在しており、乳がんの発症、症状の悪化の原因の一つとしてECM密度の増加による組織の「硬化」が挙げられている。しかし、ECMの硬化具合(量)が細胞の増殖能をどのように調節するのかといったシグナル伝達系や転写制御の理解は進んでいない。本研究では、ECMの硬さを受け取る細胞膜-細胞骨格領域でのシグナル伝達の調節が下流の転写因子の調節をどのように変え乳がんの増殖率に影響を与えるのか、そのメカニズム全容の解明を目指す。

Outline of Final Research Achievements

This research project focused on the ErbB2 receptor signaling, which has been implicated in extracellular matrix stiffness, malignant transformation and breast cancer subtype classification, to determine the underlying molecular mechanisms from transcriptional regulation to cell cycle entry, and their impact on sensitivity to cell cycle inhibitors. The analysis of live cell imaging data using cell cycle reporters, combined with epigenetic and transcriptomic omics analysis, was validated using breast cancer cell lines with different levels of ErbB2 overexpression. The differential expression of ErbB2 was found to regulate the G1/S transition-associated c-Myc and cyclin D1 protein ratio. In addition, we identified one of the mechanisms by which how does ErbB2-mediated change in the ratio of c-Myc and cyclin D1 alter sensitivity to CDK4 inhibitors.

Academic Significance and Societal Importance of the Research Achievements

ErbB2の発現量が比較的低いLuminal Aサブタイプ内において、局所的に観察されるErbB2の発現量の違いがどのように細胞周期制御の分子機構を調節するのか、その詳細なメカニズムは不明であった。本研究課題では、ErbB2、c-Myc、cyclin D1の発現量の比率の関係が、細胞周期の進行を制御し、細胞周期阻害剤処理後の増殖率を判定する上で重要な指標となる可能性を示した。また、乳がん細胞における細胞外マトリックス(ECM)の硬化は、ErbB2の発現量の変化と繋がっているため、今後、ECMの硬化具合がどのように細胞周期状態に影響し、薬剤応答性を変化させるのか、その予測に役立てることができる。

Report

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

    (5 results)

All 2024 2023 2022

All Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] ErbB2/HER2 modulates Cyclin D1 and c-Myc dependency at G1/S transition, impacting CDK4 inhibitor sensitivity2024

    • Author(s)
      Ayaka Ichikawa, Ken Murakami, Kazuhiro Aoki, Mariko Okada
    • Organizer
      9th Conference on Systems Biology of Mammalian Cells
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Role of ErbB2 receptor expression on cell cycle progression and quiescence via Cyclin D1 and c-Myc.2023

    • Author(s)
      市川 彩花, 村上 賢, 青木 一洋, 岡田 眞里子.
    • Organizer
      第96回日本生化学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Regulatory mechanism of G1/S cell cycle transition via ErbB signaling network2023

    • Author(s)
      Ayaka Ichikawa
    • Organizer
      Japan-Korea Bilateral Symposium between IPR and SNU on Structure and Folding of Disease Related Proteins
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 細胞周期G1/S移行におけるErbBシグナル―CDK4クロストーク制御の解明2022

    • Author(s)
      市川彩花, 村上賢, 青木一洋, 岡田眞里子
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] ErBbシグナル伝達系を介した細胞周期G1/S移行の制御機構2022

    • Author(s)
      市川彩花, 村上賢, 青木一洋, 岡田眞里子
    • Organizer
      第95回日本生化学会大会
    • Related Report
      2022 Research-status Report

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

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