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Does the C-terminal region of the XOR trigger active conversion of the XOR resulting in vascular endothelial damage

Research Project

Project/Area Number 18K15070
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49010:Pathological biochemistry-related
Research InstitutionNippon Medical School

Principal Investigator

Fujiwara Megumi  日本医科大学, 医学部, 助教 (30648605)

Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
KeywordsATP / 変性蛋白質 / ATP不足 / アミロイドβ / プロテアソーム系 / ヒポキサンチン / サルベージ経路 / Denovo抑制 / アルツハイマー病 / XOR阻害剤 / ATP再合成 / XOR / DO変換 / 血管内皮 / D/O変換 / HUVEC / 局在 / HEK293 / C末端領域 / 虚血再灌流障害
Outline of Final Research Achievements

Since GFP-fusionXOR expression in HUVECs is cell lethal and it was difficult to localize the C-terminal region, we investigated the mechanism of the tissue-protective effect of XOR inhibitors. We found that the activation of ATP synthesis by the addition of hypoxanthine, a substrate of the salvage pathway, has a cytoprotective effect in the pathogenesis of acute energy deprivation. Furthermore, we established an expression system and aggregation formation of GFP-fused amyloid-β and its quantification method to examine the dynamics of energy metabolism in Alzheimer's disease and Down's syndrome, which are pathological conditions of chronic intracellular ATP depletion. We also confirmed the increase of degenerated neurons in the hippocampal region of DS mice. In the future, we will verify the effect of medication

Academic Significance and Societal Importance of the Research Achievements

本研究では、急性的なATP不足の病態として放射線性皮膚炎を対象とし、サルベージ経路の活性化によるATPの増強が病態抑制に効果的であることを証明した。さらに慢性的にATPが低下する病態の例としてアルツハイマー(AD)およびダウン症がある。AD患者数は2025年には700万人に達する予想がされる一方で、治療法はまだない。一方、ダウン症では若年性AD発症が60%と高く、早いと 20代で脳内に病変が認められる。DSでは全身および神経系のATPの低下が知られており、我々は若年性ADの病因が慢性的なATP不足にあると考えている。こういった慢性的なATP不足に対する新たな戦略の確立はADの発症予防に繋がる。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2022 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Hypoxanthine Reduces Radiation Damage in Vascular Endothelial Cells and Mouse Skin by Enhancing ATP Production via the Salvage Pathway2022

    • Author(s)
      Megumi Fujiwara, Nana Sato, Ken Okamoto
    • Journal Title

      Radiation research

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 血管内皮細胞の放射線障害に対するヒポキサンチンの防護的役割2019

    • Author(s)
      藤原めぐみ、岡本研、佐藤奈々
    • Organizer
      第92回 日本生化学会大会
    • Related Report
      2019 Research-status Report
  • [Patent(Industrial Property Rights)] キサンチン酸化還元酵素阻害剤を含む皮膚障害の予防または治療のための医薬組成物2019

    • Inventor(s)
      2019
    • Industrial Property Rights Holder
      2019
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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