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The mechanisms of the dysregulation of brain water channel aquaporin 4 (AQP4) after acute ischemic stroke in mice brain

Research Project

Project/Area Number 20K15895
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 46010:Neuroscience-general-related
Research InstitutionOchanomizu University

Principal Investigator

Monai Hiromu  お茶の水女子大学, 基幹研究院, 助教 (90708413)

Project Period (FY) 2020-04-01 – 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: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsアストロサイト / 大脳皮質 / 光血栓法 / マウス / アドレナリン受容体 / ミクログリア / アクアポリン4 / 細胞間質液 / 脳脊髄液 / 脳梗塞
Outline of Research at the Start

脳梗塞は、脳血流のみならず脳脊髄液(髄液)の流れも停滞させる。
これまで申請者らは、健康状態にあるマウス脳で、髄液の流れを生み出す機序に、脳の水チャネル分子であるアクアポリン4(AQP4)が関与することを報告してきた。一方、脳梗塞発生後1~2時間にはAQP4の標識が減少し始め、髄液の流れが滞留し損傷が拡大することを明らかにしてきた。しかしながら、脳梗塞によってAQP4の標識が減少する詳細な分子機序は解明されていない。
本研究では、脳梗塞の超急性期におけるAQP4分子の標識の変化が、接着タンパク質の分解による「非局在化」によって引き起こされると仮定し、生化学的手法を用いて明らかにする。

Outline of Final Research Achievements

In this research, we induced AQP4 dysregulation by the topical application of AdR agonist to the anesthetized living mouse cortex. We proposed the analysis method to evaluate the AQP4polarization using double immunohistochemistry staining with AQP4/Lectin and AQP4/glutamate synthetase. As a result, we found that AQP4polarization was significantly decreased by applying beta AdR agonist, isoproterenol, for 3 hours. Furthermore, the application of isoproterenol also induced a significant increase of microglia immunofluorescence, Iba-1, whereas no apparent change in astrocytes reactivity, GFAP.

Academic Significance and Societal Importance of the Research Achievements

脳脊髄液と間質液の交換は、正常な脳内環境を維持するのに重要な役割を果たしており、脳梗塞をはじめとする脳血管障害やアルツハイマー病に代表される神経変性疾患との関わりが示唆されています。また、アクアポリン4は、脳脊髄液と間質液の交換の駆動力として働く分子として注目されています。私達の研究成果が今後、脳梗塞やアルツハイマー病のメカニズムの更なる理解や、ひいては治療法の開発に貢献していくことが期待されます。

Report

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

    (12 results)

All 2022 2021 2020 Other

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

  • [Int'l Joint Research] コペンハーゲン大学(デンマーク)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ロチェスター大学(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ロチェスター大学(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] コペンハーゲン大学(デンマーク)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Adrenergic inhibition facilitates normalization of extracellular potassium after cortical spreading depolarization2021

    • Author(s)
      H Monai, S Koketsu, Y Shinohara, T Ueki, P Kusk, Hauglund, NL, Samson AJ, Nedergaard M, Hirase H
    • Journal Title

      Sci Rep

      Volume: 11(1) Issue: 1 Pages: 8150-8160

    • DOI

      10.1038/s41598-021-87609-w

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Transcranial cortex-wide fluorescence imaging through a fully intact skull, as a powerful tool for functional mapping: less invasive macroscopic imaging of cortical Ca2+ dynamics2020

    • Author(s)
      Monai Hiromu
    • Journal Title

      Natural Science Report, Ochanomizu University

      Volume: 71 Pages: 39-50

    • NAID

      120006895205

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Microglial involvement in the dysregulation of aquaporin-4 after acute adrenergic receptor agonism.2022

    • Author(s)
      森田笑子, 毛内拡
    • Organizer
      第99回日本生理学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Transcranial direct current stimulation alters cerebrospinal fluid-interstitial fluid exchanges in mouse brain2021

    • Author(s)
      Yan Wang, Hiromu Monai
    • Organizer
      12th Ewha-JWU-Ochanomizu Joint Symposium 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Refractive indexes estimation of living tissues using spherical aberration correction2020

    • Author(s)
      Aoi Gohma
    • Organizer
      11th Ewha-JWU-Ochanomizu Joint Symposium 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 脳損傷に伴う異常なCa2+波の伝播と回復の可視化2020

    • Author(s)
      毛内拡, 平瀬肇
    • Organizer
      第29回日本バイオイメージング学会 学術集会
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 健康な脳機能を支える脳内ロジスティクス2020

    • Author(s)
      毛内拡
    • Organizer
      第63回日本神経化学会大会
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] 脳を司る「脳」 最新研究で見えてきた、驚くべき脳のはたらき2020

    • Author(s)
      毛内 拡
    • Total Pages
      272
    • Publisher
      講談社
    • ISBN
      9784065219195
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2023-01-30  

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