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Elucidating diversity of excitatory neurons and neural ensembles in new hippocampal CA2 region

Research Project

Project/Area Number 19K22583
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 51:Brain sciences and related fields
Research InstitutionKansai Medical University

Principal Investigator

KOHARA Keigo  関西医科大学, 医学部, 講師 (60740917)

Project Period (FY) 2019-06-28 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords海馬 / CA2 / 多様性 / 集団性 / 神経回路 / 神経細胞 / 軸索 / 遺伝子組み換えマウス / 新CA2領域 / 神経活動 / シナプス / 海馬新CA2領域 / GCaMP / 興奮性神経細胞
Outline of Research at the Start

海馬新CA2は、海馬において最も近年になり出現した領域である(Kohara et al. Nat. Neurosci 2014)。そのため、海馬新CA2領域における興奮性神経細胞の多様性や集団性について、その全貌はまだ明らかになっていない。本研究において、自由行動下の海馬新CA2領域でin vivo神経活動イメージングを用いて、興奮性神経細胞の発火特性における多様性解析を行い、興奮性神経細胞の多様性の解明や集団的活動の探索を行う。

Outline of Final Research Achievements

The new CA2 region is the most recently emerged region in the hippocampus (Kohara et al. Nat. Neurosci 2014). Using the repulsive segregation gene transfer technology "BATTLE" and new CA2 region-specific Cre knock-in mice, Cre-dependent AAV, etc., we conducted an exploratory analysis of diversity and subpopulation in the new CA2 region. We found the characteristic and non-uniform projection patterns of neural circuits from CA2 to CA2 (unpublished) and obtained new preliminary experimental data on diversity and collectivity in the neo-CA2 region. We published a review article (Shinohara, Y and Kohara, K, Hippocampus 2023) that comprehensively explains the new definition of CA2 and the differences in the projection patterns between CA2 and CA3.

Academic Significance and Societal Importance of the Research Achievements

海馬新CA2領域は、社会性記憶形成に重要な役割を持つことが、近年の研究から明らかになってきているが、そのメカニズムの全貌は未だ明らかになってはいない。本研究課題で得られた予備的な研究結果によって、海馬新CA2領域の多様性と集団性の一端の解明が進んだ。社会性記憶形成のメカニズム解明進展に基盤的に貢献する予備的な知見が得られた。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (8 results)

All 2023 2020 2019 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (1 results) Remarks (2 results) Patent(Industrial Property Rights) (1 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 Research-status Report
    • Peer Reviewed
  • [Journal Article] Single-Cell Labeling Strategies to Dissect Neuronal Structures and Local Functions2023

    • Author(s)
      Kohara Keigo、Okada Masayoshi
    • Journal Title

      Biology

      Volume: 12 Issue: 2 Pages: 321-321

    • DOI

      10.3390/biology12020321

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] BATTLE: Genetically Engineered Strategies for Split-Tunable Allocation of Multiple Transgenes in the Nervous System2020

    • Author(s)
      Kohara Keigo、Inoue Akitoshi、Nakano Yousuke、Hirai Hirokazu、Kobayashi Takuya、Maruyama Masato、Baba Ryosuke、Kawashima Chiho
    • Journal Title

      iScience

      Volume: 23 Issue: 6 Pages: 101248-101248

    • DOI

      10.1016/j.isci.2020.101248

    • NAID

      120006884902

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Protocol for BATTLE-1EX: A High-Resolution Imaging Method to Visualize Whole Synaptic Structures and their Components in the Nervous System2020

    • Author(s)
      Inoue Akitoshi、Kobayashi Takuya、Hirai Hirokazu、Kanaya Noriko、Kohara Keigo
    • Journal Title

      STAR Protocols

      Volume: 1 Issue: 3 Pages: 100166-100166

    • DOI

      10.1016/j.xpro.2020.100166

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 「遺伝子組換え酵素の戦い」と反発分離調節的な遺伝子発現を実現する新規の実験戦略2020

    • Author(s)
      小原圭吾、井上昭俊、中野洋輔、平井宏和、小林拓也、丸山正人、雲財知、馬場亮輔、川島千穂
    • Organizer
      第43回日本神経科学大会
    • Related Report
      2020 Research-status Report
  • [Remarks]

    • Related Report
      2022 Research-status Report
  • [Remarks] 研究内容

    • URL

      http://keigokohara.com/research/

    • Related Report
      2020 Research-status Report
  • [Patent(Industrial Property Rights)] 「遺伝子の分離発現方法、ポリヌクレオチド、及び遺伝子組換え用キット」2019

    • Inventor(s)
      小原圭吾
    • Industrial Property Rights Holder
      関西医科大学
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-238481
    • Filing Date
      2019
    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2025-01-30  

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