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Studies on the mechanism of action of antibody-drug conjugates in EGFR mutation-positive lung cancer

Research Project

Project/Area Number 21K07100
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 InstitutionKyushu University

Principal Investigator

Iwama Eiji  九州大学, 大学院医学研究院呼吸器内科学分野, 准教授 (40567343)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords抗体薬物複合体 / 非小細胞肺癌 / EGFR遺伝子変異 / ダイマー / 耐性克服 / EGFR遺伝子変異陽性肺癌 / エンドサイトーシス / 二量体形成 / EGFR / HER2
Outline of Research at the Start

EGFR遺伝子変異陽性肺癌に対してEGFRチロシンキナーゼ阻害剤が著効を示すがいずれ耐性となる。近年、様々ながん種に対する抗体薬物複合体の開発が進んでおり、EGFR遺伝子変異陽性肺癌に対してはHER2、HER3の抗体薬物複合体の効果が期待されている。EGFR遺伝子変異陽性肺癌における抗体薬物複合体の作用機序について明らかにし、EGFRチロシンキナーゼ阻害剤耐性克服の一助とする事を目的とする。

Outline of Final Research Achievements

In this study, we found that: 1) the expression of EGFR-HER2 heterodimer formation was higher in EGFR mutation-positive lung cancer cell lines than in EGFR wild-type cells; 2) in cells without HER2 amplification, almost all of the internalized HER2 in cells without HER2 amplification coexisted with EGFR; 3)internalized HER2 in EGFR mutation-positive cells was rapidly transported to lysosomes; 4) The anti-HER2 antibody-drug conjugate trastuzumab emtansine (T-DM1) was effective in EGFR mutation-positive lung cancers, sensitivity to T-DM1 was high and this sensitivity was maintained in cell lines after osimertinib resistance. These findings indicate that the formation of numerous HER2-EGFR heterodimers in EGFR mutation-positive lung cancers increases the sensitivity to T-DM1 by increasing EGFR-mediated uptake of HER2 into the cytoplasm and lysosomes, and that anti HER2 antibody-drug conjugates could be a new therapeutic strategy for EGFR mutation-positive lung cancer.

Academic Significance and Societal Importance of the Research Achievements

EGFR遺伝子変異陽性肺癌に対するEGFR-TKI耐性に関するこれまでの報告は、その細胞内シグナル伝達の解明、阻害に関するものが主体であり、変異型EGFRの細胞内動態と抗体薬物複合体の効果に着目した研究は認めなかった。本研究において、EGFR遺伝子変異陽性肺癌におけるEGFR-HER2ヘテロダイマーの細胞内動態を明らかにするとともに、HER2に対する抗体薬物複合体の作用機序を明らかにし学会、論文報告を行った。これらの結果はEGFR遺伝子変異陽性肺癌を含む様々ながん種に対する抗体薬物複合体開発の一助になると考えられ、学術的、社旗的意義の高い研究と考えられる。

Report

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

    (2 results)

All 2023 2022

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (1 results)

  • [Journal Article] Mutant forms of EGFR promote HER2 trafficking through efficient formation of HER2-EGFR heterodimers2023

    • Author(s)
      Tsutsumi Hirono、Iwama Eiji、Ibusuki Ritsu、Shimauchi Atsushi、Ota Keiichi、Yoneshima Yasuto、Inoue Hiroyuki、Tanaka Kentaro、Nakanishi Yoichi、Okamoto Isamu
    • Journal Title

      Lung Cancer

      Volume: 175 Pages: 101-111

    • DOI

      10.1016/j.lungcan.2022.11.018

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Mutant EGFR affects HER2 dynamics, providing a rationale for HER2-targeted therapy for EGFR-mutated lung cancer2022

    • Author(s)
      Hirono Tsutsumi, Eiji Iwama, Ritsu Ibusuki, Yasuto Yoneshima, Kentaro Tanaka, Isamu Okamoto
    • Organizer
      第81回日本癌学会学術集会
    • Related Report
      2022 Research-status Report

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

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