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Elucidating the Neural Basis of "Ambiguous" Memory: Inhibitory Inputs to Memory Engram Cells

Research Project

Project/Area Number 20K15932
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Kobayashi Kyogo  九州大学, 理学研究院, 助教 (40867735)

Project Period (FY) 2020-04-01 – 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 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords記憶エングラム / カルシウムイメージング / 海馬 / 記憶エングラム細胞 / 文脈恐怖条件付け / 抑制性細胞 / 記憶痕跡細胞 / 遺伝学的標識 / 海馬歯状回 / 文脈依存的恐怖条件付け学習 / 文脈依存的恐怖条件付け
Outline of Research at the Start

約1000台のコンピュータを3日間稼働させ続けることで、Google社の人工知能は猫の画像を認識できるようになった。しかしネズミは、イエネコが誕生する1万年前よりももっと古い時代からネコ目動物を危険な捕食者として認識してきた。このように生物が長い年月をかけて発達させてきた高度な知性の一つとして「記憶の汎化」があげられるが、その神経メカニズムは謎のままである。そこで本研究では、マウス海馬領域に存在する特定の記憶情報を保持する細胞(エングラム細胞)に神経入力する抑制性細胞を標識し、その神経活動のモニターと活動操作を実施することで、記憶の汎化を制御する神経メカニズムの解明を目指す。

Outline of Final Research Achievements

In this study, we focused on the role of the hippocampal region of the brain in spatial/contextual memory, particularly the cellular basis of the specificity control mechanism of memory. The hippocampus is crucial for memories related to locations and situations, such as "Where am I now?" and "Which room am I in?" Damage to the hippocampus can significantly impair daily life. Additionally, it is suggested that spatial memory by the hippocampus requires a certain degree of flexibility and "ambiguity," but the detailed mechanisms remain largely unexplained. In this study, we utilized calcium imaging techniques to measure the neural activity of memory engram cells in mice. This allowed us to deepen our understanding of the mechanisms by which flexible and accurate memory is established.

Academic Significance and Societal Importance of the Research Achievements

学術的意義:本研究は、海馬が空間・文脈記憶に果たす役割とその特異性制御機構の細胞基盤を解明することに貢献した。特に、記憶エングラム細胞の神経活動をカルシウムイメージング法で計測し、記憶の特異性メカニズムを明らかにした点が学術的に重要である。これにより記憶に関する新たな知見が得られ、神経科学の発展に寄与することができた。
社会的意義:本研究の成果は、海馬の機能不全がもたらす記憶障害などの理解と治療法の開発に役立つ可能性がある。具体的には、記憶の柔軟性と正確性を維持するための新しいアプローチが期待される。

Report

(6 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2024 2023 2022 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results) Remarks (2 results)

  • [Journal Article] Persistent representation of the environment in the hippocampus2023

    • Author(s)
      Kyogo S Kobayashi, Naoki Matsuo
    • Journal Title

      Cell Reports

      Volume: 42 Issue: 1 Pages: 111989-111989

    • DOI

      10.1016/j.celrep.2022.111989

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Unraveling the Mechanism of Memory Engram Cell Allocation in Contextual Fear Conditioning using Ca2+ Imaging2024

    • Author(s)
      Kyogo Kobayashi, Tsuyoshi Tatsukawa, Jun-nosuke Teramae, Naoki Matsuo
    • Organizer
      NEURO2024
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Hippocampal CA1 Ensemble Activities Underlying Associative Learning of Contextual Fear2024

    • Author(s)
      Naoki Matsuo, Tsuyoshi Tatsukawa, Jun-nosuke Teramae, Kyogo Kobayashi
    • Organizer
      NEURO2024
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 大規模神経活動データから意味のあるシグナルを自動抽出するアルゴリズムの開発2024

    • Author(s)
      小林曉吾
    • Organizer
      数理・データサイエンスに関する教育・研究支援プログラム 研究成果発表会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] Ca2+イメージングを用いた記憶痕跡細胞の割り当て機構の解明2024

    • Author(s)
      小林曉吾
    • Organizer
      第6回これからの神経回路研究の会
    • Related Report
      2023 Research-status Report
  • [Presentation] Calcium imaging of mouse hippocampal CA1 cells during a contextual fear conditioning paradigm2022

    • Author(s)
      Kyogo Kobayashi, Kaito Takashima, Jun-nosuke Teramae, Naoki Matsuo
    • Organizer
      The 45th Annual Meeting of the Japan Neuroscience Society
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Calcium imaging of hippocampal CA1 engram cells before, during, and after contextual fear conditioning2022

    • Author(s)
      Kyogo Kobayashi, Tsuyoshi Tatsukawa, Jun-nosuke Teramae, Naoki Matsuo
    • Organizer
      Learning & Memory Meeting
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Calcium imaging of mouse hippocampal CA1 cells during a contextual fear conditioning paradigm2022

    • Author(s)
      Kyogo Kobayashi, Kaito Takashima, Jun-nosuke Teramae, Naoki Matsuo
    • Organizer
      NEURO2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Remarks] Zenode: MATLAB code used in Cell Reports (2023)

    • URL

      https://doi.org/10.5281/zenodo.7597144

    • Related Report
      2022 Research-status Report
  • [Remarks] GitHub: MATLAB code used in Cell Reports (2023)

    • URL

      https://github.com/KyogoSKobayashi/Kobayashi_and_Matsuo_CellReports2023

    • Related Report
      2022 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2026-01-16  

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