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Elucidation of mechanisms of xCT-mediated cancer therapy resistance accompanied with metabolic reprograming and cancer stem cell property

Research Project

Project/Area Number 21H02766
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 50010:Tumor biology-related
Research InstitutionFujita Health University (2023)
Keio University (2021-2022)

Principal Investigator

Nagano Osamu  藤田医科大学, 腫瘍医学研究センター, 教授 (30404346)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2023: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2022: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2021: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywordsp62/SQSTM1 / xCT / 抗がん剤耐性 / オートファジー / 肺がん / フェロトーシス / p62 / 小細胞肺がん / がん幹細胞 / 小細胞肺癌 / 癌幹細胞
Outline of Research at the Start

当該研究では小細胞肺癌(SCLC)の悪性化に関わるp62/SQSTM1およびxCTの機能的役割を明らかにするため、① xCT発現が癌幹細胞性に与える影響の解析 ② p62/SQSTM1を介したxCTの発現制御機構 ③ 新規SCLCマウスモデルとxCT標的治療の開発に関する研究を行う。さらに、我々が最近開発した新規xCT阻害剤と併用剤による合成致死誘導療法の抗腫瘍効果についてマウスモデルを用いて解析することで臨床応用に向けた非臨床POCの取得を目指す。

Outline of Final Research Achievements

The initial standard treatment for small cell lung cancer (SCLC) is systemic chemotherapy with platinum drugs, but many patients experience relapse or disease progression. However, the mechanisms promoting resistance in relapsed/aggravated SCLC cells remain largely unknown. In this study, we demonstrated that the regulation of xCT expression via p62/SQSTM1 is involved in the progression of SCLC cells. Furthermore, we found that autophagy deficiency contributes to the cisplatin resistance of SCLC cells. Therefore, we searched for inhibitors to develop therapies targeting p62/SQSTM1 and identified promising candidates that can reduce the protein stability of p62/SQSTM1.

Academic Significance and Societal Importance of the Research Achievements

小細胞肺癌(SCLC)の初回標準治療はプラチナ製剤併用全身化学療法であるが、その多くが再発・増悪をきたす。しかしながら、再発・増悪したSCLC細胞の治療抵抗性を促進するメカニズムについてはほとんど分かっていない。このようにアンメットメディカルニーズが高いがん腫におけてp62/SQSTM1を介した治療抵抗性メカニズムを明らかにし、新たな候補薬を同定した。この薬剤が臨床応用されれば、SCLCやp62/SQSTM1を高発現する高悪性度のがんに対して新たな治療法の開発に繋がることが期待でき、広く社会に貢献することが可能になる。

Report

(3 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (7 results)

All 2022 2021

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

  • [Journal Article] Presence of spontaneous epithelial-mesenchymal plasticity in esophageal cancer2022

    • Author(s)
      Tsuchihashi Kenji、Hirata Yuki、Yamasaki Juntaro、Suina Kentaro、Tanoue Kenro、Yae Toshifumi、Masuda Kenta、Baba Eishi、Akashi Koichi、Kitagawa Yuko、Saya Hideyuki、Nagano Osamu
    • Journal Title

      Biochemistry and Biophysics Reports

      Volume: 30 Pages: 101246-101246

    • DOI

      10.1016/j.bbrep.2022.101246

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] MEK inhibition suppresses metastatic progression of <i>KRAS</i> ‐mutated gastric cancer2022

    • Author(s)
      Yamasaki Juntaro、Hirata Yuki、Otsuki Yuji、Suina Kentaro、Saito Yoshiyuki、Masuda Kenta、Okazaki Shogo、Ishimoto Takatsugu、Saya Hideyuki、Nagano Osamu
    • Journal Title

      Cancer Science

      Volume: 113 Issue: 3 Pages: 916-925

    • DOI

      10.1111/cas.15244

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] がん転移におけるフェロトーシス抵抗性2022

    • Author(s)
      永野修
    • Organizer
      第31回日本がん転移学会学術集会・総会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] シスチントランスポーターxCTとALDHを標的とした新しいがん治療2022

    • Author(s)
      永野修
    • Organizer
      日本薬物動態学会第37回年会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Development of cancer therapy by simultaneous targeting of cystine-glutamate antiporter xCT and aldehyde dehydrogenase2022

    • Author(s)
      Osamu Nagano
    • Organizer
      The Cold Spring Harbor Asia conference on Iron, Reactive Oxygen Species & Ferroptosis in Life, Death & Disease, AWAJI, JAPAN
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Novel approach for cancer therapy by simultaneous targeting of xCT-dependent cystine transport and aldehyde dehydrogenase activity2022

    • Author(s)
      Osamu Nagano
    • Organizer
      Redox Week in Sendai 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Therapeutic targeting of redox system in cancer stem cells2021

    • Author(s)
      永野修
    • Organizer
      第80回日本癌学会学術総会
    • Related Report
      2021 Annual Research Report
    • Invited

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

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