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Neurodevelopmental toxicities of chemicals are related to an increased microglial activation and neuroinflammation in the neocortex

Research Project

Project/Area Number 17K00572
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Risk sciences of radiation and chemicals
Research InstitutionKindai University

Principal Investigator

NAGAO Tetsuji  近畿大学, 理工学部, 教授 (30351563)

Co-Investigator(Kenkyū-buntansha) 福嶋 伸之  近畿大学, 理工学部, 准教授 (10254161)
駒田 致和  近畿大学, 理工学部, 講師 (90523994)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords神経発生発達毒性 / 化学物質曝露 / ミクログリア / 炎症因子 / ミクログリア活性 / 神経発生毒性 / 大脳皮質 / ミクログリア活性異常 / ニューロン新生 / 免疫組織染色 / 液性因子 / 海馬歯状回 / 神経科学 / 細胞・組織 / 有害化学物質
Outline of Final Research Achievements

Microglia are the immune cells of the central nervous system (CNS), play a critical role in its development and are involved in neural stem cells proliferation, differentiation, and migration in the developing CNS. To evaluate the microglial morphology and the gene expression of pro-inflammatory cytokines in the neocortex, mice were exposed to BPA or VPA at the critical period. Offspring exposed showed an increased number of amoeboid-type microglia, a microglial differentiation disruption, and an abnormal expression of genes encoding pro-inflammatory factors. The abnormalities induced by VPA exposure were ameliorated by co-treatment with anti-inflammatory drug. The findings suggest that the cytoarchitecture of the neocortex can be restored via treatment with anti-inflammatory agents that target microglial abnormalities and neuroinflammation. Anti-inflammatory therapeutics may provide a novel preventive approach for the abnormalities after the exposure to chemicals.

Academic Significance and Societal Importance of the Research Achievements

近年、化学物質曝露を原因とする発達障害に罹患した子どもの増加の可能性が懸念されている。化学物質は日々進化し、多くの新規物質が開発されて、それは新たな化学物質に子どもたちが曝露していることにほかならない。つまり、化学物質曝露による神経発生毒性機序を明らかにし、その予防法を確立することは急務である。神経発生毒性においてミクログリアに着目した病態解明を行うことで、脳内炎症と発生毒性との関連について新たな知見を見出すことができる。特に発生・発達毒性は発症してしまうと治療することは困難なため予防が重要である。そこで本研究では脳内炎症を標的とした新たな予防法の確立を目指した点に意義がある。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017

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

  • [Journal Article] The neonicotinoids acetamiprid and imidacloprid impair neurogenesis and alter the microglial profile in the hippocampal dentate gyrus of mouse neonates2019

    • Author(s)
      Nakayama Akira、Yoshida Manami、Kagawa Nao、Nagao Tetsuji
    • Journal Title

      Journal of Applied Toxicology

      Volume: 39 Issue: 6 Pages: 877-887

    • DOI

      10.1002/jat.3776

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Neurodevelopmental toxicity in the mouse neocortex following prenatal exposure to acetamiprid2018

    • Author(s)
      Kagawa Nao、Nagao Tetsuji
    • Journal Title

      Journal of Applied Toxicology

      Volume: 38 Issue: 12 Pages: 1521-1528

    • DOI

      10.1002/jat.3692

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Exposure to bisphenol A affects GABAergic neuron differentiation in neurosphere cultures.2018

    • Author(s)
      Fukushima Nobuyuki、Nagao Tetsuji
    • Journal Title

      NeuroReport

      Volume: 印刷中 Issue: 9 Pages: 712-717

    • DOI

      10.1097/wnr.0000000000001021

    • Related Report
      2018 Research-status Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Endocrine disrupting chemicals, 4-nonylphenol, bisphenol A and butyl benzyl phthalate, impair metabolism of estradiol in male and female rats as assessed by levels of 15α-hydroxyestrogens and catechol estrogens in urine2017

    • Author(s)
      Nakagomi Madoka、Suzuki Emako、Saito Yoshiaki、Nagao Tetsuji
    • Journal Title

      Journal of Applied Toxicology

      Volume: 38 Issue: 5 Pages: 688-695

    • DOI

      10.1002/jat.3574

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mechanisms underlying neuro-inflammation and neurodevelopmental toxicity in the mouse neocortex following prenatal exposure to ethanol2017

    • Author(s)
      Komada Munekazu、Hara Nao、Kawachi Satoko、Kawachi Kota、Kagawa Nao、Nagao Tetsuji、Ikeda Yayoi
    • Journal Title

      Scientific Reports

      Volume: 7 Issue: 1 Pages: 4934-4934

    • DOI

      10.1038/s41598-017-04289-1

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Prenatal exposure to valproic acid induces dysplasia of the neocortex and neuro-inflammation in mice.2019

    • Author(s)
      Komada M, Kamiyama H, Kagawa N, Nagao T.
    • Organizer
      The 59th Annual Meeting of Japanese Teratology Society
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 子宮内メチル水銀曝露した児マウスにおける第三脳室上衣細胞繊毛運動低下について2018

    • Author(s)
      萩野大、萩原央記、南武志、長尾哲二、巽純子
    • Organizer
      日本先天異常学会第58回学術集会
    • Related Report
      2018 Research-status Report 2017 Research-status Report
  • [Presentation] Developmental exposure to methyl mercury decreased ciliary movement of ependymal cells in the third ventricle of mice.2018

    • Author(s)
      Hagino H, Hagiwara T, Tatsumi J, Nagao T, Minami T.
    • Organizer
      The 8th International Congress of ASIAN Society of Toxicology (ASIATOX 2018).
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Developmental exposure to methyl mercury decreased ciliary movement of ependymal cells in the third ventricle of mice.2018

    • Author(s)
      Hagino H, Hagiwara T, Tatsumi J, Nagao T, Minami T.
    • Organizer
      The 8th International Congress of ASIAN Society of Toxicology (ASIATOX 2018)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 胎児期低用量ビスフェノールA曝露は炎症を伴うミクログリアの異常を誘発する2017

    • Author(s)
      駒田致和、高橋美文、長尾哲二、池田やよい
    • Organizer
      日本先天異常学会第57回学術集会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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