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Developmental change in synaptic plasticity of corticomotoneuronal direct connections: Do motoneurons learn?

Research Project

Project/Area Number 18K06528
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 46030:Function of nervous system-related
Research InstitutionTeikyo University

Principal Investigator

Ohno Takae  帝京大学, 医学部, 准教授 (60508109)

Co-Investigator(Kenkyū-buntansha) 福田 諭  帝京大学, 医学部, 助教 (50425641)
Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords運動ニューロン / 皮質運動ニューロン直接結合 / シナプス除去 / 光遺伝学的刺激法 / ホールセル記録 / 皮質運動ニューロン直接接合 / シナプス可塑性 / 長期増強(LTP) / GluN2B / 脊髄運動ニューロン / 皮質脊髄路 / 可塑性 / 急性スライス / 長期増強LTP / 脊髄
Outline of Final Research Achievements

The developmental time course of the positive ratio and the synaptic strength of cortico-motoneuronal direct connections showed that the direct connections were formed by 1W after birth, reached a plateau at 2W, and then the elimination began and disappeared after 3W. The results were submitted to an English journal (Neuroscience, 2021).
This process of synapse removal was accompanied by the change in the pre-synaptic state due to a change in the paired pulse ratio, but there was no change in the amplitude of the miniture EPSCs, indicating that the post-synaptic state was not involved in the process. Selective knockout of GluN2B from motoneurons partially inhibited synaptic removal, suggesting that GluN2B is involved in this synaptic removal process.

Academic Significance and Societal Importance of the Research Achievements

組織の低酸素化を最大限遅らせ、迅速に脊髄を取り出す独自の手法にて頸髄急性スライスを作成することで、世界的にも困難とされてきた生後3週以降の脊髄運動ニューロンからのホールセル記録を可能にしたことは、運動ニューロンの研究に大きく貢献できるものと考える。また、皮質脊髄路シナプス除去過程ではpresynapseに変化が生じているもpostの関与は明らかでなく、NMDA受容体サブユニットの1つであるGluN2Bを運動ニューロンから選択的にノックアウトすると、シナプス除去が部分的に阻害された事から、本過程にはGluN2Bが関与しており、遺伝的要因に加え、活動依存的な影響も受けていることが示唆された。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (14 results)

All 2023 2022 2021 2020 2019 2018

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Temporal Course of Transient Direct Corticomotoneuronal Connections during Development in Rodents2021

    • Author(s)
      Ohno T, Fukuda S, Murabe N, Niido M, Sakurai M
    • Journal Title

      Neuroscience

      Volume: 478 Pages: 89

    • DOI

      10.1016/j.neuroscience.2021.09.006

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 発達期マウスにおける一過性皮質脊髄運動ニューロン直接結合: その除去メカニズムと個体・系統発生的意義2021

    • Author(s)
      大野孝恵
    • Journal Title

      女医界

      Volume: 824 Pages: 79-83

    • Related Report
      2021 Research-status Report
  • [Journal Article] 発達期マウスにおける一過性皮質脊髄運動ニューロン直接結合:その除去メカニズムと個体・系統発生的意義2021

    • Author(s)
      大野孝恵
    • Journal Title

      女醫界

      Volume: 824 Pages: 79-83

    • Related Report
      2020 Research-status Report
  • [Journal Article] Reevaluation of motoneuron morphology: diversity and regularity among motoneurons innervating different arm muscles along a proximal-distal axis2020

    • Author(s)
      Fukuda S, Maeda H, Sakurai M
    • Journal Title

      Sci Rep

      Volume: 4;10(1) Issue: 1

    • DOI

      10.1038/s41598-020-69662-z

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 幼若期齧歯類において形成される皮質脊髄軸索-上肢運動ニューロン間直接シナプスは高等霊長類に類似した分布を示す2018

    • Author(s)
      新戸瑞穂、福田諭、大野孝恵、桜井正樹
    • Journal Title

      帝京医学雑誌

      Volume: 41 Pages: 137-148

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] New approach of cell types and their networks of red nucleus2023

    • Author(s)
      Takae Ohno
    • Organizer
      The 100th Annual Meeting of the Physiological Society of Japan
    • Related Report
      2022 Annual Research Report
  • [Presentation] The elimination of cortico-motoneuronal synapses during development: involvement of GluN2B containing NMDA receptor2022

    • Author(s)
      Takae Ohno
    • Organizer
      The 99th Annual Meeting of the Physiological Society of Japan
    • Related Report
      2022 Annual Research Report
  • [Presentation] The elimination of cortico-motoneuronal synapses during development: involvement of GluN2B containing NMDA receptior2022

    • Author(s)
      大野孝恵
    • Organizer
      第99回日本生理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Involvement of GluN2B-containing NMDA receptors in the elimination of cortico-motoneuronal synapses during development2021

    • Author(s)
      Takae Ohno
    • Organizer
      Society for Neuroscience, Chicago, 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Developmental synapse elimination in cortico-motoneuronal synapse2021

    • Author(s)
      大野孝恵
    • Organizer
      第44回日本神経科学学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Regression and its time course of transient cortico-motoneuronal direct connections during development in mice2020

    • Author(s)
      大野孝恵
    • Organizer
      第43回日本神経科学大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Motoneurons may show a spectrum of arborization pattern depending on the distal-proximal axis of their innervating muscles2020

    • Author(s)
      福田諭
    • Organizer
      第43回日本神経科学大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Temporal profile of transient corticomotoneuronal direct connection in the rodent2019

    • Author(s)
      Takae Ohno, Satoshi Fukuda, Naoyuki Murabe, Hiroaki Mizukami, Keiya Ozawa, Toshihiro Hayashi, Masaki Sakurai
    • Organizer
      北米神経科学学会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Temporal profile of developmental change in corticomotoneuronal direct connection in rodents2018

    • Author(s)
      Takae Ohno, Satoshi Fukuda, Naoyuki Murabe, Hiroaki Mizukami, Keiya Ozawa, Toshihiro Hayashi, Masaki Sakurai
    • Organizer
      The 41st Annual Meeting of the Japan Neuroscience Society
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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