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Neural dynamics and memory consolidation in prefrontal cortex

Research Project

Project/Area Number 20K07715
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 51010:Basic brain sciences-related
Research InstitutionKansai Medical University

Principal Investigator

HAYASHI Yuichiro  関西医科大学, 医学部, 博士研究員 (90378737)

Project Period (FY) 2020-04-01 – 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 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords前頭前皮質 / カルシウムイメージング / 学習 / 報酬学習 / 空間記憶 / 記憶 / 長期記憶 / 顕微鏡 / 前頭前野
Outline of Research at the Start

大脳皮質における記憶の長期保存の仕組みは不明な点が多い。例えば、記憶のコーディング様式として、個々のニューロンの安定な活動パターンとして記憶が維持される可能性、もしくは、個々のニューロン活動は不安定だが多数のニューロンの集団的活動として情報が保持される可能性が考えられる。この問題についていくつかの研究が行われているが統一的な見解は無いようである。本研究では空間記憶に着目し、タスク実行中のマウス前頭前野からカルシウムイメージングを行い、神経活動を1細胞分解能で長期的に記録し、空間記憶関連ニューロンの活動安定性について解析する。

Outline of Final Research Achievements

Rodents can distinguish between spatial environments and associate them with other behaviorally relevant information. In the hippocampus, a subpopulation of neurons that are active only in a specific spatial environment have been found, and they are likely involved in memory linked to the environment. Because the memory initially formed in the hippocampus is consolidated and stored long-term in neocortex, how spatial information is encoded in neocortex is an intriguing question. To address this, the activity of mouse mPFC in four different environments was recorded. In contrast to the CA1, the majority of mPFC neurons were inactive (45%) or active in all four environments (52%), and neurons active in 1-3 environments were rare (3%). Long-term tracking of mPFC activity revealed that the number of environments in which a cell showed activity was not preserved over time. These results suggest that the context representation in the mPFC is completely different from that in the hippocampus.

Academic Significance and Societal Importance of the Research Achievements

人間を含む多くの動物には空間を認識する能力があり、様々な感覚と記憶を頼りに自分がどんな空間のどこに居るかを知ることができる。この能力が損なわれると社会生活に著しい不都合が生じる。海馬には空間内の場所特異的に活動するニューロンが存在し、場所感覚の基盤をなしていると考えられているが、空間を識別し自分の位置を知る脳内機構は現在も良くわかっていない。一方、大脳皮質にも空間特異的に活動するニューロンが見つかっており、脳の空間認識機構についてより幅広く調べるため、本研究では海馬と大脳皮質の場所表現の違いについて研究した。

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

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

  • [Journal Article] The temporal and contextual stability of activity levels in hippocampal CA1 cells2023

    • Author(s)
      Hayashi Yuichiro、Kobayakawa Ko、Kobayakawa Reiko
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 120 Issue: 17

    • DOI

      10.1073/pnas.2221141120

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thiazoline-related innate fear stimuli orchestrate hypothermia and anti-hypoxia via sensory TRPA1 activation2021

    • Author(s)
      Matsuo Tomohiko、Isosaka Tomoko、Hayashi Yuichiro、Tang Lijun、Doi Akihiro、Yasuda Aiko、Hayashi Mikio、Lee Chia-Ying、Cao Liqin、Kutsuna Natsumaro、Matsunaga Sachihiro、Matsuda Takeshi、Yao Ikuko、Setou Mitsuyoshi、Kanagawa Dai、Higasa Koichiro、Ikawa Masahito、Liu Qinghua、Kobayakawa Reiko、Kobayakawa Ko
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 2074-2074

    • DOI

      10.1038/s41467-021-22205-0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chromatin loading of MCM hexamers is associated with di-/tri-methylation of histone H4K20 toward S phase entry.2021

    • Author(s)
      Hayashi-Takanaka Y, Hayashi Y, Hirano Y, Miyawaki-Kuwakado A, Ohkawa Y, Obuse C, Kimura H, Haraguchi T, Hiraoka Y.
    • Journal Title

      Nucleic Acids Res.

      Volume: 49 Issue: 21 Pages: 12152-12166

    • DOI

      10.1093/nar/gkab1068

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 海馬CA1細胞の活動レベルの時間・文脈依存性2022

    • Author(s)
      林勇一郎、小早川高、小早川令子
    • Organizer
      第45回日本神経科学大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Constrained NMF-based extraction method of calcium activity from wide-field volumetric imaging data2021

    • Author(s)
      Yuichiro Hayashi
    • Organizer
      第44回日本神経科学学会大会
    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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