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Analysis of the mechanism how iron is transported safely in cytoplasm

Research Project

Project/Area Number 19K23722
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0701:Biology at molecular to cellular levels, and related fields
Research InstitutionNagoya University

Principal Investigator

Yanatori Izumi  名古屋大学, 医学系研究科, 助教 (40454847)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords鉄 / 鉄代謝 / 鉄シャペロン / 鉄シャペロン分子 / フェリチン / シャペロン / 細胞内輸送
Outline of Research at the Start

鉄が活性酸素産生の重要な要素であることは疑いの余地がないものの、活性酸素の主な発生部位であるミトコンドリアにおいて、鉄の膜輸送機構は全く解っていない。さらに、小胞体内での鉄はコラーゲン合成に必須であることが報告されているが、細胞質ゾル内の鉄を小胞体に輸送する機構は明らかでない。そこで、これまでの鉄シャペロンと鉄輸送体の機能解析を行った知見と技術を用い、細胞内に取込まれた鉄イオンを、鉄シャペロンがどのようにして細胞質ゾル内で輸送しているか?また、各小器官は如何にして鉄イオンを取り込んでいるか?を解析することで、鉄の取込み、分配・利用、排出という一連の鉄の動向について解析を行う。

Outline of Final Research Achievements

Iron is an essential but potentially hazardous bio-metal. Because of its ability to readily accept or donate electrons, iron is a valuable cofactor. However, iron is potentially toxic because it catalyzes the generation of reactive oxygen species. Despite its high abundance in nature, ferric iron is poorly bioavailable due to its exceedingly low solubility at physiological pH. Thus, the acquisition and usage of iron presents a considerable challenge to cells and organisms, which have evolved sophisticated mechanisms to satisfy their metabolic needs and concomitantly minimize the risk of toxicity.
The endoplasmic reticulum (ER) has a central role in lipid and protein biosynthesis, where some enzymes need iron as a cofactor. Previous study demonstrated that the metal transporter had an iron transport activity in fly but not in human. Thus, I investigated whether this transporter possessed an iron transport activity at ER membrane.

Academic Significance and Societal Importance of the Research Achievements

これまで、細胞の内外での鉄の動態については多くの研究がなされてきたが、細胞内でどのように鉄が輸送されているかについてはほとんど不明のままであった。近年、鉄による細胞・組織障害は広く知られるようになり、鉄を介した新たな細胞死・フェロトーシスに関する報告は急激に増加している。鉄が細胞障害を起こすメカニズムの詳細を明らかにする上で細胞内で鉄がどのように輸送され、各小器官へと輸送されているかを知ることは非常に重要な意味を持つ。また、本研究で注目した輸送体(A)の変異はヒトでも報告があり、今後の疾患の原因究明につながることが期待される。

Report

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

    (5 results)

All 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (1 results) Book (1 results)

  • [Journal Article] Asbestos conceives Fe(II)-dependent mutagenic stromal milieu through ceaseless macrophage ferroptosis and β-catenin induction in mesothelium2020

    • Author(s)
      Ito Fumiya、Yanatori Izumi、Maeda Yuki、Nimura Kenta、Ito Satoki、Hirayama Tasuku、Nagasawa Hideko、Kohyama Norihiko、Okazaki Yasumasa、Akatsuka Shinya、Toyokuni Shinya
    • Journal Title

      Redox Biology

      Volume: 36 Pages: 101616-101616

    • DOI

      10.1016/j.redox.2020.101616

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The new role of poly (rC)-binding proteins as iron transport chaperones: Proteins that could couple with inter-organelle interactions to safely traffic iron2020

    • Author(s)
      Yanatori Izumi、Richardson Des R.、Toyokuni Shinya、Kishi Fumio
    • Journal Title

      Biochimica et Biophysica Acta (BBA) - General Subjects

      Volume: 1864 Issue: 11 Pages: 129685-129685

    • DOI

      10.1016/j.bbagen.2020.129685

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] How iron is handled in the course of heme catabolism: Integration of heme oxygenase with intracellular iron transport mechanisms mediated by poly (rC)-binding protein-22019

    • Author(s)
      Izumi Yanatori, Des R Richardson, Shinya Toyokuni, Fumio Kishi
    • Journal Title

      Archives of biochemistry and biophysics

      Volume: 672 Pages: 108071-108078

    • DOI

      10.1016/j.abb.2019.108071

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Intracellular iron transport: specific iron delivering system in cytosol2019

    • Author(s)
      Izumi Yanatori
    • Organizer
      第42回日本分子生物学会年会
    • Related Report
      2019 Research-status Report
  • [Book] Ferroptosis in Health and Disease2019

    • Author(s)
      Shinya Toyokuni, Izumi Yanatori
    • Total Pages
      324
    • Publisher
      Springer, Cham
    • ISBN
      9783030267803
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-09-03   Modified: 2022-01-27  

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