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Overcoming Molecular Targeted Drug Resistance in Aromatase Inhibitor-Resistant Breast Cancer.

Research Project

Project/Area Number 19K09084
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55010:General surgery and pediatric surgery-related
Research InstitutionFujita Health University

Principal Investigator

Hikichi Masahiro  藤田医科大学, 医学部, 研究員 (80794130)

Co-Investigator(Kenkyū-buntansha) 林 孝典  藤田医科大学, 医学部, 講師 (40724315)
下野 洋平  藤田医科大学, 医学部, 教授 (90594630)
喜島 祐子  藤田医科大学, 医学部, 教授 (60381175)
内海 俊明  藤田医科大学, 医学部, 教授 (10176711)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords難治性乳がん治療 / 乳がん / パルボシクリブ / エストロゲン / アロマターゼ / CDK4/6 / 薬剤耐性 / Rab / アロマターゼ阻害薬 / Akt
Outline of Research at the Start

実臨床では,AI耐性を克服するべくmTOR阻害剤:Everolimus(Eve)やCDK4/6阻害剤:Palbociclib(Palb)を用いた分子標的治療が注目され,恩恵をもたらしている。しかし,これら分子標的治療薬は患者による治療効果の個人差は大きい。本申請研究では,AI耐性モデルである長期エストロゲン枯渇MCF-7(LTED)30株のを網羅的に解析し,EveとPalbの感受性に関係する因子の特定と分子メカニズムの解明を,がん幹細胞に着目して基礎的検討を行う。さらに,臨床上得られたヒト乳がん細胞を,高度免疫不全マウスに移植して得られるヒト乳がんモデルマウスを使いて検証していく。

Outline of Final Research Achievements

A cyclin-dependent kinase 4/6 (CDK4/6) inhibitor palbociclib (Palb) emerged as an effective treatment option for aromatase inhibitor-resistant breast cancers. However, molecular mechanisms and predictive biomarkers for Palb-resistance are not elucidated. This study established the 30 lines of long-term estrogen-deprived (LTED) MCF7 breast cancer cells as a model for aromatase inhibitor-resistant breast cancers. We explored factors involved in the aromatase inhibitor-resistance in breast cancers.
The results revealed that the higher the expression of Rab31, the more effective Palb was. This study suggests that Rab31 is a biomarker for Palb resistance in aromatase inhibitor-resistant breast cancer and a negative regulator.

Academic Significance and Societal Importance of the Research Achievements

本研究によって明らかになった,Rabをバイオマーカーとして利用することによりPalbの適正な利用が可能になる。また,Rab31とPalbの分子メカニズムを明らかにすることで,難治性乳がんの新たな治療法開発に発展させられる可能性がある。

Report

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

    (1 results)

All 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results)

  • [Journal Article] Upregulation of CIP2A in estrogen depletion‐resistant breast cancer cells treated with low‐dose everolimus2020

    • Author(s)
      Nishio Eiji、Hayashi Takanori、Akaza Mao、Hisatomi Yukiko、Hikichi Masahiro、Fujii Takuma、Utsumi Toshiaki、Harada Nobuhiro、Shimono Yohei
    • Journal Title

      FEBS Open Bio

      Volume: 10 Issue: 10 Pages: 2072-2080

    • DOI

      10.1002/2211-5463.12956

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access

URL: 

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

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