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Effects of reactive oxygen species on spinal ventral horn neurons and investigation of neuroprotective therapy for spinal cord injury

Research Project

Project/Area Number 15K19989
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Orthopaedic surgery
Research InstitutionNiigata University

Principal Investigator

OHASHI Masayuki  新潟大学, 医歯学総合病院, 医員 (70706720)

Project Period (FY) 2015-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords活性酸素 / 過酸化水素 / 脊髄損傷 / 二次障害 / パッチクランプ / 脊髄保護療法 / 脊髄保護 / 興奮毒性 / 脊髄前角 / シナプス伝達 / 電位依存性カルシウムチャネル / リアノジン受容体
Outline of Final Research Achievements

We investigated how pathological levels of H2O2, an abundant reactive oxygen species, regulate synaptic transmission and neuronal excitability in VH neurons of rats using a whole-cell patch-clamp approach. H2O2 increased the release of glutamate and GABA from presynaptic terminals. The increase in glutamate release involved N-type voltage-gated calcium channels (VGCCs), ryanodine receptors (RyR), and inositol triphosphate receptors (IP3R); the increase in GABA release, which inhibited glutamatergic transmission, involved IP3R. On the other hand, H2O2 decreased neuronal excitability via activation of extrasynaptic GABAA receptors. H2O2 depressed the medium and slow afterhyperpolarisation, suggesting that H2O2 per se has the potential to induce hyperexcitability in VH neurons via a decrease in conductance of small-conductance calcium-activated potassium (SK) channels. Moreover, N-type VGCC inhibitor (ziconotide) attenuated damage induced by spinal cord injury in rat models.

Report

(3 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • Research Products

    (7 results)

All 2016 2015

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 2 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Hydrogen peroxide modulates neuronal excitability and membrane properties in ventral horn neurons of the rat spinal cord2016

    • Author(s)
      Masayuki Ohashi, Toru Hirano, Kei Watanabe, Hirokazu Shoji, Nobuko Ohashi, Hiroshi Baba, Naoto Endo, Tatsuro Kohno
    • Journal Title

      Neuroscience

      Volume: 331 Pages: 206-220

    • DOI

      10.1016/j.neuroscience.2016.06.033

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Hydrogen peroxide modulates synaptic transmission in ventral horn neurons of the rat spinal cord2016

    • Author(s)
      Masayuki Ohashi, Toru Hirano, Kei Watanabe, Keiichi Katsumi, Nobuko Ohashi, Hiroshi Baba, Naoto Endo, Tatsuro Kohno
    • Journal Title

      The Journal of Physiology

      Volume: 594 Issue: 1 Pages: 115-134

    • DOI

      10.1113/jp271449

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Hydrogen peroxide modulates neuronal excitability and membrane properties in ventral horn neurons of the rat spinal cord2016

    • Author(s)
      Masayuki Ohashi, Toru Hirano, Kei Watanabe, Hirokazu Shoji, Nobuko Ohashi, Hiroshi Baba, Naoto Endo, Tatsuro Kohno
    • Organizer
      Society for Neuroscience 46th Annual Meeting
    • Place of Presentation
      サンディエゴ (米国)
    • Year and Date
      2016-11-12
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 酸化ストレスによる脊髄前角細胞の興奮性と膜特性の変化2016

    • Author(s)
      大橋正幸、平野徹、渡辺慶、庄司寛和、河野達郎、遠藤直人
    • Organizer
      第31回日本整形外科学会基礎学術集会
    • Place of Presentation
      福岡国際会議場(福岡県福岡市)
    • Year and Date
      2016-10-13
    • Related Report
      2016 Annual Research Report
  • [Presentation] 活性酸素は脊髄前角においてN型電位依存性Ca2+チャネルの活性化を介してグルタミン酸放出を増強する2016

    • Author(s)
      大橋正幸、河野達郎、平野徹、渡辺慶、庄司寛和、遠藤直人
    • Organizer
      第89回日本整形外科学会学術総会
    • Place of Presentation
      パシフィコ横浜(神奈川県・横浜市)
    • Year and Date
      2016-05-12
    • Related Report
      2015 Research-status Report
  • [Presentation] 活性酸素は脊髄前角においてN型電位依存性Ca2+チャネルの活性化を介してグルタミン酸放出を増強する2016

    • Author(s)
      大橋正幸、河野達郎、平野徹、渡辺慶、庄司寛和、遠藤直人
    • Organizer
      第45回日本脊椎脊髄病学会学術集会
    • Place of Presentation
      幕張メッセ(千葉県・千葉市)
    • Year and Date
      2016-04-14
    • Related Report
      2015 Research-status Report
  • [Presentation] Hydrogen peroxide modulates synaptic transmission in ventral horn neurons of the rat spinal cord2015

    • Author(s)
      Masayuki Ohashi, Toru Hirano, Kei Watanabe, Keiichi Katsumi, Naoto Endo, Hiroshi Baba, Tatsuro Kohno
    • Organizer
      Society for Neuroscience 45th Annual Meeting
    • Place of Presentation
      シカゴ (米国)
    • Year and Date
      2015-10-16
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2018-03-22  

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