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Ultra-fast observation of cortico-hippocampal functional dynamics

Research Project

Project/Area Number 20H03295
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 44050:Animal physiological chemistry, physiology and behavioral biology-related
Research InstitutionUniversity of Yamanashi

Principal Investigator

Shinohara Yoshiaki  山梨大学, 大学院総合研究部, 教授 (10425423)

Co-Investigator(Kenkyū-buntansha) 大野 伸彦  自治医科大学, 医学部, 教授 (10432155)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2022: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2020: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Keywords海馬 / 大脳皮質 / 脳波 / カルシウム活動 / 徐波 / シータ活動 / 協調活動 / カルシウムイメージング / 皮質 / 脳領域間 / イメージング
Outline of Research at the Start

海馬は空間記憶やエピソード記憶の形成に必須であるが、海馬で形成された記憶は 長時間かけて大脳皮質に移動していく。この記憶移動過程を電気生理と組み合わせた全大脳皮質イメージングで検証し、解剖的な基盤を3次元電子顕微鏡で観測する。動物に分かり易い行動実験パラダイムを与え、異なる情報を処理する皮質間の同調活動が生じるようにする。その学習過程を繰り返すことで、海馬との動機活動が必要であるかどうかを検証する。

Outline of Final Research Achievements

We performed simultaneous measurement of hippocampal EEG activity and neocortical calcium activity with transgenic mice. Fortunately, we were able to observe strong activity correlations between the hippocampus and neocortex in both theta condition and slow wave activities. We compared two groups of animals which were reared in socially isolated condition (ISO) and enriched condition (ENR). In both groups, we found a correlation between hippocampal and cortical activity during theta activity as well as sharp wave and ripples (SWR). The former is a novel finding because it is technically difficult due to requirement of high time resolution. Interestingly, we observed stronger correlation between hippocampal EEG activities and neocortical calcium oscillations in ISO animals than ENR groups. After submission, a lot of analyses were demanded by reviewers. Unfortunately, due to lab move and a lot of educational duties, I still need more time to make this paper published.

Academic Significance and Societal Importance of the Research Achievements

環境依存的な脳機能の修飾は神経科学のみならず、精神医学・神経病理学上も重要な問題であり、豊かな環境飼育がなぜ神経疾患に抵抗性を示すかを解明することは重要である。もともと研究では豊かな環境で脳全般の協調活動が増大するという仮説の下実験を行ったが、それとは正反対の結果を得た。左右海馬では豊かな環境飼育で協調活動が増加するので、環境操作は回路特異的に神経活動を修飾するという結果を示した。

Report

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

    (6 results)

All 2023 2022 2021

All Journal Article (6 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 4 results)

  • [Journal Article] Projections of hippocampal CA2 pyramidal neurons: Distinct innervation patterns of CA2 compared to CA3 in rodents2023

    • Author(s)
      Yoshiaki Shinohara, Keigo Kohara
    • Journal Title

      Hippocampus

      Volume: Feb 28 Issue: 6 Pages: 1-9

    • DOI

      10.1002/hipo.23519

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Correlative light and electron microscopic observation of calcium phosphate particles in a mouse kidney formed under a high-phosphate diet2023

    • Author(s)
      Battulga Batpurev、Shiizaki Kazuhiro、Miura Yutaka、Osanai Yasuyuki、Yamazaki Reiji、Shinohara Yoshiaki、Kubota Yoshiyuki、Hara Toru、Kuro-o Makoto、Ohno Nobuhiko
    • Journal Title

      Scientific Reports

      Volume: 13 Issue: 1 Pages: 852-860

    • DOI

      10.1038/s41598-023-28103-3

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Heterogeneity and regulation of oligodendrocyte morphology2022

    • Author(s)
      Osanai Yasuyuki、Yamazaki Reiji、Shinohara Yoshiaki、Ohno Nobuhiko
    • Journal Title

      Frontiers in Cell and Developmental Biology

      Volume: 10 Pages: 1-13

    • DOI

      10.3389/fcell.2022.1030486

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Macroscopic detection of demyelinated lesions in mouse PNS with neutral red dye2021

    • Author(s)
      Yamazaki Reiji、Osanai Yasuyuki、Kouki Tom、Shinohara Yoshiaki、Huang Jeffrey K.、Ohno Nobuhiko
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 1-10

    • DOI

      10.1038/s41598-021-96395-4

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Adrenergic inhibition facilitates normalization of extracellular potassium after cortical spreading depolarization2021

    • Author(s)
      H Monai, S Koketsu, Y Shinohara, T Ueki, P Kusk, Hauglund, NL, Samson AJ, Nedergaard M, Hirase H
    • Journal Title

      Sci Rep

      Volume: 11(1) Issue: 1 Pages: 8150-8160

    • DOI

      10.1038/s41598-021-87609-w

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Perivascular macrophages produce type I collagen around cerebral small vessels under prolonged hypertension in rats2021

    • Author(s)
      Inagaki Takeshi、Fujiwara Ken、Shinohara Yoshiaki、Azuma Morio、Yamazaki Reiji、Mashima Kiyomi、Sakamoto Atsushi、Yashiro Takashi、Ohno Nobuhiko
    • Journal Title

      Histochemistry and Cell Biology

      Volume: Published online Issue: 4 Pages: 1-10

    • DOI

      10.1007/s00418-020-01948-9

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research

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

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