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Analysis of the cause of locomotor dysfunction caused by vitamin B12 deficiency in elderly

Research Project

Project/Area Number 19K15767
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 38050:Food sciences-related
Research InstitutionTottori University

Principal Investigator

BITO Tomohiro  鳥取大学, 農学部, 助教 (20776421)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsビタミンB12 / Caenorhabditis elegans / 酸化ストレス / サルコペニア / ロコモティブシンドローム / 線虫 / ユビキチン / ジチロシン / 筋肉 / ミオシン / アクチン / 運動機能障害
Outline of Research at the Start

高齢者で多発するビタミンB12 (B12) 欠乏性運動機能障害の分子メカニズムを解明するため、モデル生物 線虫 Caenorhabditis elegans を用いて、B12 の欠乏が筋組織の合成・分解制御システムに及ぼす影響を解析する。事業期間において、B12欠乏線虫を調製し、筋組織の蛍光観察ならびに筋肉の合成・分解を制御するシグナル経路の遺伝子・タンパク質発現を解析する。また、筋肉の合成・分解のシグナル経路関連遺伝子の発現を低下させた線虫を作出し、B12欠乏線虫の表現型と比較検討し、B12欠乏性運動機能障害の原因を探索する。

Outline of Final Research Achievements

To clarify the cause of locomotor dysfunction caused by vitamin B12 deficiency, the effect of vitamin B12 deficiency on muscle in Caenorhabditis elegans was analyzed. In vitamin B12 deficient nematodes, we found aging-like changes in actin and myosin fibers that consist of muscle fibers. It was presumed that the ubiquitin-proteasome system, which promoted the decomposition of muscle tissue, was activated by the oxidative stress induced vitamin B12 deficiency. In addition, it was clarified that the locomotor dysfunction of vitamin B12-deficient C. elegans is partially related to the decrease of the quantity and quality in the surface collagen of nematodes.

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、高齢者で多発するビタミンB12欠乏症と加齢性筋委縮症(サルコペニア)の関連性が垣間見れることより、サルコペニアの新しい予防・診断・治療法の開発に向け、本成果の社会学的意義は極めて大きい。特にこれまでに報告がないビタミンB12欠乏による筋肉の分解系促進は加齢・老化の視点を取り入れ、解析を進めるべき課題であると考えられる。また、ヒト疾病のモデル生物を用いて酸化ストレスがコラーゲン分子間の変異を誘発する仕組みを解明した点についての学術的意義は高い。

Report

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

    (4 results)

All 2021 2019

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

  • [Journal Article] Dityrosine Crosslinking of Collagen and Amyloid-β Peptides Is Formed by Vitamin B12 Deficiency-Generated Oxidative Stress in Caenorhabditis elegans2021

    • Author(s)
      Koseki Kyohei、Yamamoto Aoi、Tanimoto Keisuke、Okamoto Naho、Teng Fei、Bito Tomohiro、Yabuta Yukinori、Kawano Tsuyoshi、Watanabe Fumio
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 23 Pages: 12959-12959

    • DOI

      10.3390/ijms222312959

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ビタミンB12欠乏が線虫(Caenorhabditis elegans)の運動機能および筋組織に及ぼす影響2019

    • Author(s)
      美藤友博, 真鍋若菜, 岡本奈穂, 薮田行哲, 河野強, 渡邉文雄
    • Organizer
      第73回日本栄養・食糧学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Mechanisms of oxidative stress induced by vitamin B12 deficiency in the nematode Caenorhabditis elegans2019

    • Author(s)
      Tomohiro Bito, Naho Okamoto, Yukinori Yabuta, Fumio Watanabe
    • Organizer
      The 7th International Conference on Food Factors 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] ビタミンB12欠乏が線虫(C. elegans)の脂質代謝に及ぼす影響2019

    • Author(s)
      美藤友博, 岡本奈穂, 後井俊哉, 薮田行哲, 河野強, 渡邉文雄
    • Organizer
      第52回 日本栄養・食糧学会 中国・四国支部大会
    • Related Report
      2019 Research-status Report

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

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