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Elucidation of the mechanisms underlying iron-induced ferroptosis

Research Project

Project/Area Number 22K06222
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44010:Cell biology-related
Research InstitutionKyoto University

Principal Investigator

Hiroaki Fujita  京都大学, 医学研究科, 特定講師 (90738006)

Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2024: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsフェロトーシス / セレン / セレンタンパク質 / 鉄 / 細胞死
Outline of Research at the Start

本研究は既存のフェロトーシス誘導系とは異なり、鉄添加のみでフェロトーシスを誘導できるユニークな系を確立し、その系を用いて全遺伝子を対象とした網羅的スクリーニングを行った。その結果、鉄による脂質過酸化惹起に関与すると考えられる因子に加え、多数の新規フェロトーシス促進・抑制因子を同定している。それら因子の解析により鉄によるフェロトーシス惹起機構のみならず、新規の抑制機構・フェロトーシス実行メカニズムの解明を目指す。

Outline of Final Research Achievements

Ferroptosis, an iron-dependent form of cell death, has been vigorously studied due to its relevance to cancer, neurodegenerative diseases, and ischemic conditions. In this study, we established a novel system that induces ferroptosis through iron supplementation in cells and used this system to screen for regulatory factors. Through this screening, we identified PRDX6 as a novel selenoprotein synthesis factor. In PRDX6-deficient cells, the expression of selenoprotein GPX4 -a master suppressor of ferroptosis- was reduced, leading to cell death upon iron treatment. Furthermore, we discovered that PRDX6 binds to selenium, the essential element for selenoprotein, revealing that PRDX6 functions as a previously unidentified intracellular selenium carrier.

Academic Significance and Societal Importance of the Research Achievements

細胞内のセレン輸送体は20年以上前より存在が示唆されていたが、未同定であった。本研究によりPRDX6がセレン輸送体としてフェロトーシスの制御に関与することを明らかにし、生命にとって必須の制御系であるセレンタンパク質合成系の一旦を明らかにした。さらにPRDX6とがんとの関連にも探索し、PRDX6はがん細胞で高発現であり、PRDX6高発現のがん患者では予後が悪いことを見出した。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (13 results)

All 2025 2024 2023 2022

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 2 results,  Invited: 4 results) Book (1 results)

  • [Journal Article] PRDX6 augments selenium utilization to limit iron toxicity and ferroptosis2024

    • Author(s)
      2.Fujita H., Tanaka Y., Ogata S., Suzuki N., Kuno S., Barayeu U., Akaike T., Ogra Y. and Iwai K.
    • Journal Title

      Nature structural & molecular biology

      Volume: 31 Issue: 8 Pages: 1277-1285

    • DOI

      10.1038/s41594-024-01329-z

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Iron-induced NCOA4 condensation regulates ferritin fate and iron homeostasis2022

    • Author(s)
      S. Kuno, H. Fujita, Y. Tanaka, Y. Ogra, and K. Iwai
    • Journal Title

      EMBO reports

      Volume: e54278 Issue: 5

    • DOI

      10.15252/embr.202154278

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Genome-wide iron-induced ferroptosis screen uncovers PRDX6 as a novel selenium carrier protein2025

    • Author(s)
      藤田宏明
    • Organizer
      Redox Week in Sendai
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] フェロトーシスを制御する新たなセレン代謝経路の解明2025

    • Author(s)
      藤田宏明
    • Organizer
      日本薬学会
    • Related Report
      2024 Annual Research Report
  • [Presentation] 鉄誘導性フェロトーシスのメカニズム解明2025

    • Author(s)
      藤田宏明
    • Organizer
      レドックス R&D 戦略委員会 春のシンポジウム
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] フェロトーシスを制御する新たなセレン動態の解明2024

    • Author(s)
      藤田宏明
    • Organizer
      日本生化学会 シンポジウム
    • Related Report
      2024 Annual Research Report
  • [Presentation] Mechanisms underlying iron-induced ferroptosis2024

    • Author(s)
      藤田宏明
    • Organizer
      シグナルネットワーク研究会
    • Related Report
      2024 Annual Research Report
  • [Presentation] 鉄誘導性フェロトーシスのメカニズム解明2024

    • Author(s)
      藤田宏明
    • Organizer
      フォーラム2024 衛生薬学・環境トキシコロジー
    • Related Report
      2024 Annual Research Report
  • [Presentation] 鉄誘導性フェロトーシスのメカニズム解明2024

    • Author(s)
      藤田宏明
    • Organizer
      鉄バイオサイエンス学会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Mechanisms underlying iron-induced ferroptosis: possibile involvement of selenium metabolism2024

    • Author(s)
      藤田宏明
    • Organizer
      The 1st international G-RE-XS Conference
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 鉄依存性フェロトーシスの制御メカニズム解明2023

    • Author(s)
      藤田宏明
    • Organizer
      日本生化学会 シンポジウム
    • Related Report
      2023 Research-status Report
  • [Presentation] 鉄誘導性フェロトーシス の制御メカニズム解明2022

    • Author(s)
      藤田宏明
    • Organizer
      メタルバイオサイエンス学会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Book] フェロトーシスとセレン代謝2024

    • Author(s)
      藤田宏明, 岩井一宏
    • Total Pages
      4
    • Publisher
      医学のあゆみ
    • Related Report
      2024 Annual Research Report

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Published: 2022-04-19   Modified: 2026-01-16  

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