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Elucidation of the mechanisms of copper metabolism during the development and evaluation of acquired effects of copper nutritional status on brain tissue

Research Project

Project/Area Number 19K16346
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 47030:Pharmaceutical hygiene and biochemistry-related
Research InstitutionChiba University

Principal Investigator

Tanaka Yu-ki  千葉大学, 大学院薬学研究院, 助教 (50824041)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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銅代謝 / 新生児 / 化学形態別分析 / メタロチオネイン / 酸化ストレス / 銅 / ICP-MS
Outline of Research at the Start

新生仔期の動物は成体と比べて、肝臓において銅濃度の上昇が見られる。このような変化が、生理的な要因で受動的に起きるのか、成長のための能動的な戦略なのかという背景や機序の解明は、従来の元素濃度のみに着目したアプローチでは限界があった。本研究では、銅濃度に加え、化学形態、組織内分布、遺伝子発現量などのデータを取得し、新生仔の銅代謝の変動機序を解明する。さらに、血液脳関門が未発達な新生仔は過剰な銅によって脳が敏感に影響を受けると予想される。そこで、新生仔の銅摂取量を変化させ、脳における銅の分布と酸化ストレスの影響を経時的に検証する。

Outline of Final Research Achievements

It is known that copper is highly accumulated in the liver of animals during the fetal to neonatal period compared to that of adult animals. In this study, we found that the copper concentration in the liver of rat neonates decreased to about 1/10 from 2 to 5 weeks of age. Speciation analysis by liquid chromatography hyphenated ICP-mass spectrometry revealed that copper bound to metallothionein in the liver decreased, while copper bound to ceruloplasmin in the serum increased. It was suggested that low expression of the copper chaperone Atox1 in the liver during the neonatal period suppressed copper excretion from the liver. As well as the antioxidant protein Atox1, the expression levels of copper-related proteins can be influenced by the hypoxic conditions during the fetal period, and affect the unique copper metabolism in neonates.

Academic Significance and Societal Importance of the Research Achievements

銅は生体必須元素であり、生物の発生、発達に欠かすことはできない。一方、過剰な銅は生体内でフェントン反応を触媒し、活性酸素種の生成に寄与する。新生仔期に肝臓に過剰蓄積している銅はメタロチオネインに結合した毒性の低い形態で貯蔵されているものの、潜在的には銅が多量に存在しているため、正常な解毒代謝機構が破綻した場合や、栄養としての銅負荷が過剰になった場合には個体への影響が懸念される。本研究の成果によって、新生仔(児)期の特異的な銅代謝状態が明らかにされ、発生や発達に有害な影響を及ぼす可能性のある銅の適切な栄養状態を確保することの重要性が示された。

Report

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

    (8 results)

All 2022 2020 2019

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Recent advances in copper analyses by inorganic mass spectrometry2022

    • Author(s)
      Yasumitsu Ogra, Yu-ki Tanaka, and Noriyuki Suzuki
    • Journal Title

      Journal of Clinical Biochemistry and Nutrition

      Volume: 71 Issue: 1 Pages: 2-6

    • DOI

      10.3164/jcbn.21-170

    • ISSN
      0912-0009, 1880-5086
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quantitative elemental analysis of a single cell using inductively coupled plasma-mass spectrometry in fast time-resolved analysis mode2020

    • Author(s)
      Yu-ki Tanaka, Risako Iida, Shohei Takada, Tetsuo Kubota, Michiko Yamanaka, Naoki Sugiyama, Yolande Abdelnour and Yasumitsu Ogra
    • Journal Title

      ChemBioChem

      Volume: 21 Issue: 22 Pages: 3266-3272

    • DOI

      10.1002/cbic.202000358

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Role of Metallothionein in Transcriptional Regulation by Metal-Responsive Element-Binding Transcription Factor 12020

    • Author(s)
      Yu-ki Tanaka、Yoshiaki Futamii、Yasunori Fukumotoi、Noriyuki. Suzukii、Yasumitsu Ogra,
    • Journal Title

      BPB Reports

      Volume: 3 Pages: 22-27

    • NAID

      130007944892

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 微量元素と腎・各論1 銅と腎2020

    • Author(s)
      田中佑樹、小椋康光
    • Journal Title

      腎臓内科

      Volume: 11 Pages: 128-135

    • Related Report
      2019 Research-status Report
  • [Journal Article] Evaluation of copper metabolism in neonatal rats by speciation analysis using liquid chromatography hyphenated to ICP mass spectrometry2019

    • Author(s)
      Tanaka Yu-ki、Ogra Yasumitsu
    • Journal Title

      Metallomics

      Volume: 11 Issue: 10 Pages: 1679-1686

    • DOI

      10.1039/c9mt00158a

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Evaluation of copper metabolism in neonatal rat based on speciation analysis by LC-ICP-MS2019

    • Author(s)
      Yu-ki Tanaka、Yasumitsu Ogra
    • Organizer
      7th International Symposium on Metallomics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] メタロチオネインによる重金属依存性転写因子の活性調節機構の解明2019

    • Author(s)
      田中佑樹、二見叔亮、松橋研武、福本泰典、鈴木紀行、小椋康光
    • Organizer
      メタルバイオサイエンス研究会2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 化学形態別分析に基づくラット新生仔の銅代謝機序の解明2019

    • Author(s)
      田中佑樹、小椋康光
    • Organizer
      第5回レギュラトリーサイエンスフォーラム
    • Related Report
      2019 Research-status Report

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

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