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The relationship between Smad signaling and ischemia-induced brain inflammation

Research Project

Project/Area Number 18K08862
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55050:Anesthesiology-related
Research InstitutionOsaka Prefecture University

Principal Investigator

Nakajima Takayuki  大阪府立大学, 生命環境科学研究科, 准教授 (30333644)

Co-Investigator(Kenkyū-buntansha) 竹中 重雄  大阪府立大学, 総合リハビリテーション学研究科, 教授 (10280067)
近藤 友宏  大阪府立大学, 生命環境科学研究科, 講師 (40585238)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords全脳虚血 / Smad / TGF-β / ミクログリア / アストロサイト / 海馬 / 脳内炎症反応
Outline of Final Research Achievements

Ischemia-induced changes in Smad phosphorylation and the effect of Smad signaling on ischemia-induced brain inflammation in the hippocampus was examined using global cerebral ischemia model rat. Five minutes of ischemia induced neuronal cell death and increased the number of phosphorylated Smad-immunopositive astrocytes and microglia. The ischemia also increased in the expression TGF-β1 mRNA in the hippocampus. The intracerebroventricular injection of SB525334, an inhibitor of TGF-β signaling, canceled the ischemia-induced increase in the number of phosphorylated Smad-immunopositive glial cells. These results suggest that the ischemia induces the TGF-β1/Smad signaling in the glial cells of the hippocampus. The expression levels of mRNAs for brain inflammation molecules including IL-1β, TNF-α and CX3CR1 increased in the hippocampus after ischemia. However, the treatment of SB525334 did not changed the ischemia-induced increase in the expression level of mRNAs of these molecules.

Academic Significance and Societal Importance of the Research Achievements

過去、全脳虚血モデルを用いた研究により虚血後の海馬でのTGF-β mRNA発現レベルの上昇が報告されてる。しかしながら、虚血後海馬においてTGF-βが作用する細胞については明らかにされていなかった。今回の研究によって、虚血後の海馬ではミクログリアとアストロサイトがTGF-βシグナルの標的細胞となっていることを明らかにすることができた。虚血後脳のグリア細胞は虚血後の病態悪化に関連することが示唆されている。今後、グリア細胞でのTGF-β1/Smadシグナリングの機能的意義を詳細に検証することで虚血後脳症の病態軽減につながる有効な知見が得られると考える。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (9 results)

All 2021 2020 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (8 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Changes in Smad1/5/9 expression and phosphorylation in astrocytes of the rat hippocampus after transient global cerebral ischemia2021

    • Author(s)
      Nakajima T, Kunieda Y, Takahashi Y, Tanaka Y, Kondo T, Takenaka S.
    • Journal Title

      J Chem Neuroanat.

      Volume: 113 Pages: 101941-101941

    • DOI

      10.1016/j.jchemneu.2021.101941

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 全脳虚血後の海馬アストロサイトにおけるSmad1/5/9発現とリン酸化について2021

    • Author(s)
      田中 勇気、中島崇行
    • Organizer
      第1回獣医解剖アカデミア
    • Related Report
      2020 Annual Research Report
  • [Presentation] 全脳虚血後の海馬グリア細胞におけるSmadの発現とその活性について2020

    • Author(s)
      中島 崇行、髙橋 勇祐、竹中 重雄
    • Organizer
      第125回日本解剖学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 全脳虚血後の海馬グリア細胞におけるSmadの発現とその活性について2020

    • Author(s)
      中島 崇行、髙橋 勇祐、竹中 重雄
    • Organizer
      日本解剖学会
    • Related Report
      2019 Research-status Report
  • [Presentation] The Expression and Activation of Smad proteins in Glial Cells of the Rat Hippocampus After Transient Global Cerebral Ischemia2019

    • Author(s)
      Yusuke Takahashi, Shigeo Takenaka and Takayuki Nakajima
    • Organizer
      7th Congress for Asian Association of Veterinary Anatomists (AAVA)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] The expression and activation of Smad in the rat hippocampus following global cerebral ischemia2019

    • Author(s)
      Yusuke Takahashi and Takayuki Nakajima
    • Organizer
      9th FAOPS congress
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Distribution of Smad mRNA and proteins in the rat brain2019

    • Author(s)
      Takayuki Nakajima
    • Organizer
      9th FAOPS congress
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] ラットの脳におけるSmadの分布と活性について2018

    • Author(s)
      中島崇行 近藤友宏
    • Organizer
      日本病態生理学会
    • Related Report
      2018 Research-status Report
  • [Presentation] ラットの脳におけるSmadの分布と活性について2018

    • Author(s)
      中島崇行
    • Organizer
      日本獣医学会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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