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Prevention of the vascular inury induced by glucose spike through the activation of the transcription factor Nrf2

Research Project

Project/Area Number 20K08890
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54040:Metabolism and endocrinology-related
Research InstitutionKagoshima University

Principal Investigator

Nishio Yoshihiko  鹿児島大学, 医歯学域医学系, 教授 (40281084)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords内皮機能 / 血管内皮機能障害 / 酸化ストレス / 高血糖 / 血管内皮機能 / 糖尿病血管合併症 / 血管合併症 / 内皮障害
Outline of Research at the Start

糖尿病患者の血管合併症の原因になると考えられている高血糖、特に一過性に何度も生じる高血糖状態(グルコーススパイク)から血管壁を守るたことを目的に、ラットの血管壁で転写因子Nrf2を活性化させて、抗酸化システム関連遺伝子の発現を増強せせる。それにより、生体の抗酸化活性の増強がグルコーススパイクによる血管内皮機能障害を抑制できることを確認し、同時に抗酸化活性の増強による人でも測定可能な白血球の遺伝子発現変化を見出し、臨床の場において抗酸化活性のモニターが可能となることを目指す。

Outline of Final Research Achievements

Neither insulin resistance nor pure glucose spikes significantly deteriorated endothelial dysfunction. However, under high-glucose (20 mM) conditions, the endothelial dysfunction of thoracic aortas from insulin resistant rats subjected to glucose spikes was significantly impaired. We observed significantly enhanced DHE fluorescence as a marker of reactive oxygen species, upregulation of an oxidative stress-related gene (NOX2), and downregulation of an antioxidant gene (SOD2) in the aortas. As expected, treatment of the aorta of this group with antioxidant agents significantly improved endothelial function. We also noted that pretreatment of aortas from the same group with CDDO-Me attenuated endothelial dysfunction, accompanied by a correction of the redox imbalance, as observed in gene expression and DHE fluorescence studies.
Thus, we showed that insulin resistance and glucose spikes exert a synergistic effect on aortic endothelial dysfunction and the treatment with CDDO-Me prevent it.

Academic Significance and Societal Importance of the Research Achievements

本研究はグルコーススパイクとインスリン抵抗性の血管内皮機能に及ぼす影響を個別に検討したものであり,グルコーススパイクは食餌誘発性肥満によるインスリン抵抗性との相乗作用によるレドックス関連遺伝子発現の不均衡化を介して,高濃度グルコースに対する血管内皮の脆弱性を増強させることを示した.さらに転写因子nrf2の活性化薬であるCDDO-Meはこの遺伝子発現の不均衡を是正し,グルコーススパイクによる血管内皮機能障害に対して保護効果を有することが明らかになった.この結果は糖尿病の大血管合併症を予防する戦略を考える上で極めて重要な示唆となると考えられた.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (2 results)

  • [Journal Article] Luseogliflozin and caloric intake restriction increase superoxide dismutase 2 expression, promote antioxidative effects, and attenuate aortic endothelial dysfunction in diet‐induced obese mice2023

    • Author(s)
      Kawade Shigeru、Ogiso Kazuma、Shayo Sigfrid Casmir、Obo Takahiko、Arimura Aiko、Hashiguchi Hiroshi、Deguchi Takahisa、Nishio Yoshihiko
    • Journal Title

      Journal of Diabetes Investigation

      Volume: 14 Issue: 4 Pages: 548-559

    • DOI

      10.1111/jdi.13981

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Repeated glucose spikes and insulin resistance synergistically deteriorate endothelial function and bardoxolone methyl ameliorates endothelial dysfunction2022

    • Author(s)
      Ogiso Kazuma、Shayo Sigfrid Casmir、Kawade Shigeru、Hashiguchi Hiroshi、Deguchi Takahisa、Nishio Yoshihiko
    • Journal Title

      PLOS ONE

      Volume: 17 Issue: 1 Pages: e0263080-e0263080

    • DOI

      10.1371/journal.pone.0263080

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dietary obesity and glycemic excursions cause a parallel increase in STEAP4 and pro-inflammatory gene expression in murine PBMCs2021

    • Author(s)
      Shayo Sigfrid Casmir、Ogiso Kazuma、Kawade Shigeru、Hashiguchi Hiroshi、Deguchi Takahisa、Nishio Yoshihiko
    • Journal Title

      Diabetology International

      Volume: 13 Issue: 2 Pages: 358-371

    • DOI

      10.1007/s13340-021-00542-1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 食事誘導性肥満が一過性高血糖による血管内皮障害を増強する機序の検討2020

    • Author(s)
      小木曽和馬、Shayo Shigfrid、川出茂、橋口裕、出口尚寿、西尾善彦
    • Organizer
      第63回日本糖尿病学会年次学術集会
    • Related Report
      2020 Research-status Report
  • [Presentation] Glucose spike and high-fat diet deferentially regulates atherosclerotic gene in rat peripheral blood mononuclear cells.2020

    • Author(s)
      Shayo Shigfrid、小木曽和馬、川出茂、橋口裕、出口尚寿、西尾善彦
    • Organizer
      第63回日本糖尿病学会年次学術集会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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