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Neuronal and synaptic mechanisms of smart fogeting by sleep/wake cycles

Research Project

Project/Area Number 21K15204
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Miyamoto Daisuke  富山大学, 学術研究部医学系, 准教授 (50748697)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords睡眠 / 記憶 / 神経細胞 / シナプス / イメージング / 光遺伝学 / マウス / 受容体 / 学習・記憶 / 睡眠・覚醒 / 神経活動 / シナプス可塑性 / オプトジェネティクス
Outline of Research at the Start

記憶を担う海馬等の脳領域は、学習時に活性化した神経細胞亜集団を記憶痕跡として割り当てる。限られた神経細胞数の活用には、記憶の取捨選択即ちスマートフォゲッティングが必要となる。本研究はスマートフォゲッティングの神経細胞・シナプス機構を解明するために、最新のin vivoオール光学式電気生理学を生体マウスに適用し、睡眠/覚醒サイクルにおける記憶痕跡細胞の活動やシナプス可塑性を長期的に計測する。さらに、記憶痕跡細胞の活動やシナプス可塑性を操作して、因果的にスマートフォゲッティングへの役割を解明する。

Outline of Final Research Achievements

Sleep reorganizes synapses and acts on both memory consolidation and forgetting. Since previous studies evaluated the average synaptic dynamics, the sleep dynamics of synapses responsible for memory were unknown. Therefore, the present study was conducted by temporal fluorescence imaging of individual neurons and spines in the cerebral cortex of living mice. Spines with increased AMPA receptor levels during learning were unaffected by post-learning sleep, whereas other spines showed decreased AMPA receptor levels during sleep. It is suggested that synaptic plasticity due to post-learning sleep weakens the average synaptic strength but allows the retention of the immediately preceding learning information, resulting in smart fogging. In order to measure neural activity through learning and sleep over a long period of time, we constructed an imaging system for single neuron resolution under free-running and head immobilization conditions.

Academic Significance and Societal Importance of the Research Achievements

成体脳の神経細胞数は殆ど増加しないため、脳は記憶容量を節約しながら学習する必要がある。そこで、本研究は生きたマウスの脳を顕微鏡観察して、記憶を担う個々のシナプスの強度を経時的に定量した。睡眠は学習により増強したシナプスを保護しながら、その他のシナプスを弱めることが分かった。睡眠は直前の学習情報を保ちながら、シナプスをクールダウンさせて記憶容量を回復させる役割があると考えられる。

Report

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

    (15 results)

All 2023 2022 2021 Other

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 7 results) Remarks (1 results)

  • [Journal Article] Neural circuit plasticity for complex non-declarative sensorimotor memory consolidation during sleep2023

    • Author(s)
      Miyamoto Daisuke
    • Journal Title

      Neuroscience Research

      Volume: 189 Pages: 37-43

    • DOI

      10.1016/j.neures.2022.12.020

    • Related Report
      2022 Annual Research Report
  • [Journal Article] NSR special issue “The idling brain in cognition”2023

    • Author(s)
      Inokuchi Kaoru、Miyamoto Daisuke
    • Journal Title

      Neuroscience Research

      Volume: 189 Pages: 1-2

    • DOI

      10.1016/j.neures.2023.02.007

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Optical imaging and manipulation of sleeping-brain dynamics in memory processing2022

    • Author(s)
      Miyamoto Daisuke
    • Journal Title

      Neuroscience Research

      Volume: 181 Pages: 9-16

    • DOI

      10.1016/j.neures.2022.04.005

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Optical imaging and manipulation of sleeping-brain dynamics in memory processing2022

    • Author(s)
      Miyamoto D
    • Journal Title

      Neuroscience Research

      Volume: 0 Pages: 0-0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Net decrease in spine-surface GluA1-containing AMPA receptors after post-learning sleep in the adult mouse cortex2021

    • Author(s)
      Daisuke Miyamoto、William Marshall、Giulio Tononi、Chiara Cirelli
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 113-113

    • DOI

      10.1038/s41467-021-23156-2

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 運動記憶の固定化を担う睡眠時におけるシナプス選択的な皮質AMPA受容体の可塑性2021

    • Author(s)
      宮本大祐
    • Journal Title

      Medical Science Digest 特集「時間生物学と医療の融合―現状と将来―」

      Volume: Vol.47 No.8 Pages: 45-47

    • Related Report
      2021 Research-status Report
  • [Presentation] 記憶回路動態へのin vivo光学的アプローチ2023

    • Author(s)
      宮本大祐
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 学習と睡眠による神経回路動態2023

    • Author(s)
      宮本大祐
    • Organizer
      科研費新学術領域研究「時間生成学―時を生み出すこころの仕組み」2022年度第2回領域会議
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 睡眠時の記憶回路再編2022

    • Author(s)
      宮本大祐
    • Organizer
      生理学研究所シナプス研究会2022「次世代シナプス生理学による脳神経機能の理解」
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 長期記憶の時間生成を担う睡眠/覚醒サイクルにおける神経活動・シナプス動態2022

    • Author(s)
      宮本大祐
    • Organizer
      科研費新学術領域研究「時間生成学―時を生み出すこころの仕組み」2022年度第1回領域会議
    • Related Report
      2022 Annual Research Report
  • [Presentation] アイドリング脳における記憶回路動態のイメージング・光操作研究2022

    • Author(s)
      宮本大祐
    • Organizer
      富山第一銀行奨学財団賞表彰式
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 脳情報表現の時間的変容への光学的アプローチ:行動からシナプスまで2022

    • Author(s)
      宮本大祐
    • Organizer
      NEURO2022(第45回日本神経科学大会/第65回日本神経化学会大会./第32回日本神経回路学会大会)
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] In vivo imaging of cortical synaptic dynamics by learning and sleep.2021

    • Author(s)
      Daisuke Miyamoto
    • Organizer
      第44回日本神経科学会大会/第1回China-Japan-Korea国際会議
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] In vivo imaging of synaptic renormalization during post-learning sleep.2021

    • Author(s)
      Daisuke Miyamoto
    • Organizer
      第20回ヒューマン・フロンティア・サイエンス・プログラム受賞者会合
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] Neuroscience Research 2023年4月特集号

    • URL

      https://www.sciencedirect.com/journal/neuroscience-research/vol/189/suppl/C

    • Related Report
      2022 Annual Research Report

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Published: 2021-04-28   Modified: 2024-01-30  

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