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Formation of abnormal neural circuit elicited by microglia with modulated gene expression exposed to environmental chemicals

Research Project

Project/Area Number 17H04714
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Risk sciences of radiation and chemicals
Research InstitutionHiroshima University

Principal Investigator

Yasuhiro Ishihara  広島大学, 統合生命科学研究科(総), 准教授 (80435073)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥24,180,000 (Direct Cost: ¥18,600,000、Indirect Cost: ¥5,580,000)
Fiscal Year 2019: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Fiscal Year 2017: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Keywordsミクログリア / 化学物質 / 発達神経毒性 / 神経回路機能 / ケモカイン / 行動異常 / エピジェネティクス / 神経回路網形成 / バルプロ酸 / 脳内炎症
Outline of Final Research Achievements

The purpose of this study is to unravel the mechanism of abnormal behavior induced by valproate, focusing on microglial activation. VPA enlarged microglial cell body and up-regulated CD68 expression in hippocampal CA1 region at the age of P10 but not 6 weeks-old. The excitation-inhibition balance at the hippocampus was shifted toward to excitation especially in CA1 region by VPA treatment. Minocycline administration clearly suppressed microglial activation and the shift of excitation-inhibition balance by VPA. Taken together, activated microglia by prenatal VPA exposure can induce excitation-inhibition imbalances in hippocampus during developmental period.

Academic Significance and Societal Importance of the Research Achievements

本研究では、発達期のVPA曝露がミクログリア活性化を介して神経回路機能の障害や成長後の行動異常を引き起こすことを示唆した。発達期において、ミクログリアが化学物質の標的となっていることを示した点で意義があり、バルプロ酸だけでなく他の発達神経毒性を引き起こすとされる化学物質へと発展させることができる知見であると考えている。また、発達神経毒性の分子メカニズムについては不明な点が多いが、ミクログリアの関与が示されたため、ミクログリアを拠点としたメカニズムの解明や、ミクログリアに効く創薬への発展も期待される。

Report

(4 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report

Research Products

(16 results)

All 2019 2018 2017 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Remarks (4 results)

  • [Int'l Joint Research] University of California, Davis(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Leibniz Research Institute(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Interleukin 33 expression induced by aryl hydrocarbon receptor in macrophages.2019

    • Author(s)
      Ishihara Y, Haarmann-Stemmannd T, Kado NY, Vogel CFA
    • Journal Title

      Toxicological Sciences

      Volume: In Press Pages: 404-414

    • DOI

      10.1093/toxsci/kfz114

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Retinoid X receptor-mediated neuroprotection via CYP19 upregulation and subsequent increases in estradiol synthesis2019

    • Author(s)
      Ishihara Yasuhiro、Sakurai Hikaru、Oguro Ami、Tsuji Mayumi、Vogel Christoph F.A.、Yamazaki Takeshi
    • Journal Title

      The Journal of Steroid Biochemistry and Molecular Biology

      Volume: 193 Pages: 105421-105421

    • DOI

      10.1016/j.jsbmb.2019.105421

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Neuroprotective activation of astrocytes by methylmercury exposure in the inferior colliculus2019

    • Author(s)
      Ishihara Yasuhiro、Itoh Kouichi、Oguro Ami、Chiba Yoichi、Ueno Masaki、Tsuji Mayumi、Vogel Christoph F. A.、Yamazaki Takeshi
    • Journal Title

      Scientific Reports

      Volume: 9 Pages: 13899-13899

    • DOI

      10.1038/s41598-019-50377-9

    • NAID

      120006799369

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Role of NF-kB RelB in Aryl Hydrocarbon Receptor-Mediated Ligand Specific Effects2019

    • Author(s)
      Ishihara Yasuhiro、Kado Sarah Y.、Hoeper Christiane、Harel Shelly、Vogel Christoph F. A.
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 20 Pages: 2652-2652

    • DOI

      10.3390/ijms20112652

    • NAID

      120006799371

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Developmental microglial activation and postgrowth abnormal behavior induced by prenatal exposure of chemicals2019

    • Author(s)
      Ishihara Y
    • Organizer
      The 35th Annual Meeting of KSOT/KEMS
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 発達期の化学物質曝露によるミクログリア活性化と成長後の行動異常2019

    • Author(s)
      石原 康宏
    • Organizer
      日本薬学会第139年会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Effects of valproate prenatal exposure on developmental microglial activity and neural circuit formation2018

    • Author(s)
      Y. ISHIHARA, T. HONDA, R. TANIGUCHI, N. ISHIHARA, T. YAMAZAKI
    • Organizer
      Neuroscience 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Activation of microglia and loss of synapse in the developing hippocampus of mice prenatally treated by valproate.2017

    • Author(s)
      Honda T, Ishihara Y, Ishida A, Yamazaki T.
    • Organizer
      Neuroscience 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 自閉症モデルマウスにおける脳発達期のミクログリアの過剰な貪食.2017

    • Author(s)
      本田 達也、石原 康宏、石田 敦彦、山崎 岳.
    • Organizer
      第58回日本生化学会中国・四国支部例会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 自閉症モデルマウスにおけるミクログリアの過剰な活性化とシナプスの減少.2017

    • Author(s)
      本田 達也、石原 康宏、石田 敦彦、山崎 岳.
    • Organizer
      第40回日本神経科学大会
    • Related Report
      2017 Annual Research Report
  • [Remarks] 広島大学大学院統合生命科学研究科生命医科学プログラム生体機能化学研究室

    • URL

      http://www.biomed.hiroshima-u.ac.jp/~ishihara/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 分子脳科学研究室HP

    • Related Report
      2018 Annual Research Report
  • [Remarks] http://home.hiroshima-u.ac.jp/ishiyasu/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 広島大学総合科学部分子脳科学研究室

    • URL

      http://home.hiroshima-u.ac.jp/ishiyasu/

    • Related Report
      2017 Annual Research Report

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Published: 2017-04-28   Modified: 2022-01-27  

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