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Subcellular analysis of the mechanism underlying ectopic spike generation in axon

Research Project

Project/Area Number 21K06434
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 InstitutionHokkaido University

Principal Investigator

Kamiya Haruyuki  北海道大学, 医学研究院, 教授 (10194979)

Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords軸索 / 海馬 / サブセルラー記録 / 数理モデル解析 / 同期リズム形成
Outline of Research at the Start

本研究では、直径4~7ミクロンと例外的に大型の海馬苔状線維の軸索終末からサブセルラーパッチクランプによる直接記録を行い、また、苔状線維を模した最新の数理モデルに基づくシミュレーションを組み合わせ、遠位軸索における異所性スパイク発生の検証、ケージ解除による異所性スパイクの発生部位の同定、シミュレーションによる異所性スパイクの数理モデル解析などの観点から、遠位軸索における異所性スパイクの発生機構について検討する。

Outline of Final Research Achievements

In this study, we directly recorded from the axon terminals of exceptionally large hippocampal mossy fibers (4-7 microns in diameter) using a subcellular patch clamp, and combined this with simulations based on the latest mathematical models that mimic mossy fibers to examine the mechanism of ectopic spike generation in distal axons, identify the site of ectopic spike generation by uncaging experiment, and analyze mathematical models of ectopic spikes by simulation. The mechanism of ectopic spike generation in distal axons was examined to identify the site of spike generation and to analyze with the mathematical model by simulation. It was shown that potassium channel inhibition and repetitive high-frequency stimulation generate ectopic spikes from distal axons of mossy fibers.

Academic Significance and Societal Importance of the Research Achievements

本研究では、生理的なスパイク発生部位である近位軸索ばかりでなく、遠位軸索からも異所性に軸索スパイクが生じる可能性について、単一軸索記録により直接的に検討した。軸索がこれまで考えられていた出力ケーブルとしての機能に加えて、局所的な微小環境の変化に応じて情報処理を担うことを明らかにした点が本研究の学術的意義であり、軸索の計算機能の詳細について今後の研究の進展が期待される。

Report

(5 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (26 results)

All 2025 2024 2023 2022 2021 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (18 results) (of which Int'l Joint Research: 9 results,  Invited: 7 results) Book (1 results) Remarks (3 results)

  • [Journal Article] Modeling analysis of depolarization-assisted afterdischarge in hippocampal mossy fibers2025

    • Author(s)
      Kamiya Haruyuki
    • Journal Title

      Frontiers in Neural Circuits

      Volume: 18 Pages: 1505204-1505204

    • DOI

      10.3389/fncir.2024.1505204

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ectopic burst induced by blockade of axonal potassium channels on the mouse hippocampal mossy fiber2024

    • Author(s)
      Kamiya Haruyuki
    • Journal Title

      Frontiers in Cellular Neuroscience

      Volume: 18 Pages: 1434165-1434165

    • DOI

      10.3389/fncel.2024.1434165

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Simulation test for impartment of use-dependent plasticity by inactivation of axonal potassium channels on hippocampal mossy fibers2023

    • Author(s)
      Zheng Fumeng、Kamiya Haruyuki
    • Journal Title

      Frontiers in Cellular Neuroscience

      Volume: 17 Pages: 1154910-1154910

    • DOI

      10.3389/fncel.2023.1154910

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Modeling analysis of subthreshold voltage signaling along hippocampal mossy fiber axons2022

    • Author(s)
      Kamiya Haruyuki
    • Journal Title

      Frontiers in Cellular Neuroscience

      Volume: 16 Pages: 966636-966636

    • DOI

      10.3389/fncel.2022.966636

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Modeling depolarization-assisted afterdischarge of hippocampal mossy fiber2025

    • Author(s)
      Haruyuki Kamiya
    • Organizer
      The 13th RIEC International Symposium on Brain Functions and Brain Computer
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 海馬苔状線維における活動電位伝播の局所制御2025

    • Author(s)
      神谷温之
    • Organizer
      第102回日本生理学会大会
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] 海馬苔状線維における後発射のシミュレーション解析2024

    • Author(s)
      神谷温之
    • Organizer
      第104回日本生理学会北海道地方会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Simulation test for depolarization-assisted unblock of spike propagation along hippocampal mossy fiber2024

    • Author(s)
      Haruyuki Kamiya
    • Organizer
      Neuroscience 2024
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stimulus-induced bursts of hippocampal mossy fibers2024

    • Author(s)
      Kamiya H
    • Organizer
      The 12th RIEC International Symposium on Brain Functions and Brain Computer
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Stimulus-induced burst of hippocampal mossy fiber projection2024

    • Author(s)
      神谷温之
    • Organizer
      第101回日本生理学会大会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] 海馬苔状線維シナプス短期可塑性における軸索カリウムチャンネル不活性化の寄与に関するシミュレーション解析2023

    • Author(s)
      神谷温之
    • Organizer
      日本生理学会北海道地方会
    • Related Report
      2023 Research-status Report
  • [Presentation] Simulation analysis of stimulus-induced hyperexcitability of hippocampal mossy fiber2023

    • Author(s)
      Kamiya H
    • Organizer
      Neuroscience 2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Computational test for the roles of potassium channel inactivation in short-term plasticity2023

    • Author(s)
      Kamiya H
    • Organizer
      The 11th RIEC International Symposium on Brain Functions and Brain Computer
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 海馬苔状線維シナプスの周波数促通における不活性化型カリウムチャネルの寄与に関するシミュレーション解析2023

    • Author(s)
      鄭 富檬、神谷温之
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 軸索興奮性の活動依存的な制御機構2023

    • Author(s)
      神谷温之
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Computational modeling of excitability tuning of hippocampal mossy fibers by axonal M-channels2022

    • Author(s)
      Zhao Peng、神谷温之
    • Organizer
      日本生理学会北海道地方会
    • Related Report
      2022 Research-status Report
  • [Presentation] Simulation analysis of use-dependent modification of presynaptic Ca2+ entry at hippocampal mossy fiber synapse2022

    • Author(s)
      Kamiya H
    • Organizer
      Neuroscience 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Modeling subthreshold voltage signaling along axon in the hippocampus2022

    • Author(s)
      Haruyuki Kamiya
    • Organizer
      The 10th RIEC International Symposium on Brain Functions and Brain Computer
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 計算論的アプローチによる軸索の閾値下シグナル の解析2022

    • Author(s)
      神谷温之
    • Organizer
      第99回日本生理学会大会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 閾値下シナプス応答が海馬苔状線維終末へのカルシウム流入に与える影響に関するシミュレーション解析2021

    • Author(s)
      神谷温之
    • Organizer
      日本生理学会北海道地方会
    • Related Report
      2021 Research-status Report
  • [Presentation] Modeling of axonal afterdepolarization at hippocampal mossy fibers2021

    • Author(s)
      Haruyuki Kamiya
    • Organizer
      Axons 2021: Structure and Function
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Simulation analysis of subthreshold voltage signaling along hippocampal mossy fibers2021

    • Author(s)
      Haruyuki Kamiya
    • Organizer
      Neuroscience 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Book] 生理学用語ハンドブック2024

    • Author(s)
      日本生理学会用語委員会
    • Total Pages
      448
    • Publisher
      丸善出版
    • ISBN
      9784621309087
    • Related Report
      2023 Research-status Report
  • [Remarks] 北海道大学大学院医学研究院神経生物学教室ホームページ

    • URL

      https://sites.google.com/view/axon-neurobiology/

    • Related Report
      2024 Annual Research Report
  • [Remarks] 北海道大学大学院医学研究院神経生物学教室ホ ー ム ペ ー ジ

    • URL

      http://neurobiology.html.xdomain.jp/

    • Related Report
      2023 Research-status Report 2022 Research-status Report
  • [Remarks] 北海道大学大学院医学研究院神経生物学教室ホームページ

    • URL

      http://neurobiology.html.xdomain.jp/

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2026-01-16  

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