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Area-specific contribution to locomotor control in premotor cortex

Research Project

Project/Area Number 19KK0414
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))

Allocation TypeMulti-year Fund
Review Section Basic Section 46030:Function of nervous system-related
Research InstitutionUniversity of Toyama (2020-2022)
Asahikawa Medical College (2019)

Principal Investigator

Nakajima Toshi  富山大学, 学術研究部医学系, 准教授 (00455792)

Project Period (FY) 2020 – 2022
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥15,210,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥3,510,000)
Keywordsネコ / 歩行 / 高次運動野 / 単一細胞記録 / 不活性化 / 随意運動 / 視覚 / 比較生理学 / 薬剤注入 / 可逆的不活性化 / トレッドミル / ムシモール
Outline of Research at the Start

高齢化社会の進展に伴い,脳疾患のために歩行が障害され転倒する危険の高い患者さんが増えています.転倒リスクが高い凹凸のある床面を歩く時には,高次運動野(ヒトでは大脳の前頭葉に複数存在します)による視覚に基づいた歩行の制御が重要と考えられています.本研究では高次運動野の各部位の障害が引き起こす歩行障害のパターンを動物実験で特徴づけ,高次運動野に着目した新たな歩行リハビリテーション法を開発するための基礎的な知見を得ることを目指します.

Outline of Final Research Achievements

To explore the roles of the premotor cortices (PMC) in controlling visually guided locomotion on uneven terrain, which entails a high risk of falling, we trained cats to walk on a treadmill with obstacles, and explored the PMC using both electrophysiological (1) and pharmacological (2) approaches.
In approach (1), we characterized the function of the 4delta subdivision of the PMC as interlimb coordination and published our findings in the following journal: Nakajima, T., Fortier-Lebel, N., & Drew, T. (2023). A secondary motor area contributing to interlimb coordination during visually guided locomotion in the cat. Cerebral Cortex, 33(2), 290-315.
Our analysis for (2) is currently ongoing, but preliminary results show that temporary inactivation of the 4delta using pharmacological intervention leads to motor impairment affecting multiple limbs, supporting the findings from (1).

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた知見は脳障害に起因する歩行障害の病態生理学的機序についての理解を深め,高次脳機能に着目した障害部位特異的な歩行リハビリテーション法を開発する礎となりました.更に,物に対して手を伸ばすといった「単発の運動」の制御という枠内で機能を特徴づけられてきた高次運動野(PMC)に,歩行運動の制御という異なった角度からアプローチを行い,PMCによる運動一般の制御機構の包括的な理解を促しました.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021 2020

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

  • [Int'l Joint Research] Universite de Montreal(カナダ)2021

    • Year and Date
      2021-09-30
    • Related Report
      2022 Annual Research Report
  • [Journal Article] A secondary motor area contributing to interlimb coordination during visually guided locomotion in the cat2022

    • Author(s)
      Nakajima Toshi、Fortier-Lebel Nicolas、Drew Trevor
    • Journal Title

      Cerebral Cortex

      Volume: in press Issue: 2 Pages: 290-315

    • DOI

      10.1093/cercor/bhac068

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Comparisons of single-unit activity in the premotor cortex controlling voluntary motor actions in monkeys and cats.2023

    • Author(s)
      Toshi Nakajima
    • Organizer
      第46回日本神経科学大会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ネコがターゲット位置を予測したか否かが到達運動前の姿勢調節に現れる2020

    • Author(s)
      中島 敏, 高橋 未来, 福山 秀青, 高草木 薫
    • Organizer
      第67回中部日本生理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] ネコ前肢リーチング運動に随伴する姿勢制御の時空間的定量化2020

    • Author(s)
      高橋 未来, 中島 敏, 宮岸 沙織, 福山 秀青, 野口 智弘, 千葉 龍介, 高草木 薫
    • Organizer
      第100回 北海道医学大会 生理系分科会
    • Related Report
      2020 Research-status Report

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Published: 2020-02-06   Modified: 2025-01-30  

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