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Dietary Iron Restriction Protects Against Aneurysm Rupture in a Mouse Model of Intracranial Aneurysm

Research Project

Project/Area Number 20K17958
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56010:Neurosurgery-related
Research InstitutionHamamatsu University School of Medicine

Principal Investigator

Kamio Yoshinobu  浜松医科大学, 医学部附属病院, 助教 (10829716)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2023: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsDietary iron restriction / Intracranial aneurysm / Iron accumulation / Macrophage infiltration / Reactive oxygen species / 鉄制限 / 酸化ストレス / 炎症細胞 / 鉄制限食 / フリーラジカル / 脳動脈瘤破裂 / 鉄集積
Outline of Research at the Start

高血圧、糖尿病、脂質異常などは細胞内に鉄イオンを取り込みやすい状態になっています。過剰な鉄イオンの集積は組織内で有害な作用を引き起こすと考えられます。子脳動脈瘤の破裂にも鉄イオンの集積が関与していると報告があり、本研究の目的として鉄イオンの集積を抑制することで脳動脈瘤破裂の予防効果の検証を行います。

Outline of Final Research Achievements

This study used a mouse model of intracranial aneurysm to evaluate the effect of dietary iron restriction on aneurysm formation and rupture. The aneurysmal rupture rate was significantly lower in iron-restricted diet mice (37%) compared with normal diet mice (76%; p < 0.05). Serum oxidative stress, iron accumulation, macrophage infiltration, and 8-hydroxy-2′-deoxyguanosine in the vascular wall were lower in iron-restricted diet mice (p < 0.01). The areas of iron positivity were similar to the areas of CD68 positivity and 8-hydroxy-2′-deoxyguanosine in both normal diet and iron-restricted diet mice aneurysms. These findings suggest that iron is involved intracranial aneurysm rupture via vascular inflammation and oxidative stress. Dietary iron restriction may have a promising role in preventing intracranial aneurysm rupture.

Academic Significance and Societal Importance of the Research Achievements

生活習慣病である高血圧、脂質異常、糖尿病により過剰な鉄イオンが血管壁に集積されることが知られている。本研究では高血圧誘導をすることで全身性炎症性変化を起こしたことで、鉄イオンが脳血管および脳動脈瘤壁に集積していることが示された。鉄イオンを介した組織障害に関して鉄制限をすることで抑制することを示したことで、将来的に鉄制限が治療へのアプローチとなることが期待される。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Dietary Iron Restriction Protects against Aneurysm Rupture in a Mouse Model of Intracranial Aneurysm2024

    • Author(s)
      Kawakatsu Toru、Kamio Yoshinobu、Makino Hiroshi、Hokamura Kazuya、Imai Ryo、Sugimura Sho、Kimura Tetsuro、Hiramatsu Hisaya、Umemura Kazuo、Hashimoto Tomoki、Kurozumi Kazuhiko
    • Journal Title

      Cerebrovascular Diseases

      Volume: 53 Issue: 2 Pages: 191-197

    • DOI

      10.1159/000531431

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] The Role of Iron-mediated Oxidative stress and Peroxidation in the Pathophysiology of Intracranial Aneurysm Rupture2024

    • Author(s)
      Yoshinobu Kamio
    • Organizer
      International Stroke Conference 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 鉄制限食を用いた鉄集積抑制による脳動脈瘤破裂 抑制効果の検討2023

    • Author(s)
      神尾 佳宣
    • Organizer
      日本脳卒中学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 脳動脈瘤壁の鉄集積による脳動脈瘤破裂メカニズムの解明と鉄制限による破裂抑制効果の検証2022

    • Author(s)
      神尾佳宣
    • Organizer
      日本分子脳神経外科学会
    • Related Report
      2022 Research-status Report
  • [Presentation] 脳動脈瘤壁の鉄集積による脳動脈瘤破裂メカニズムの解明と鉄制限による破裂抑制効果の検証2022

    • Author(s)
      神尾佳宣
    • Organizer
      STROKE2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Dietary Iron Restriction Reduces Intracranial Aneurysm Rupture in Mice Model2022

    • Author(s)
      Yoshinobu Kamio
    • Organizer
      International Stroke Conference 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 脳動脈瘤壁の鉄集積による脳動脈瘤破裂メカニズムの解明と鉄制限による抑制効果の検証2022

    • Author(s)
      神尾 佳宣
    • Organizer
      STROKE 2022
    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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