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Investigation of mechanisms generating spontaneous activity in the neonatal mouse barrel cortex

Research Project

Project/Area Number 20H03346
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 46010:Neuroscience-general-related
Research InstitutionNational Institute of Genetics

Principal Investigator

Iwasato Takuji  国立遺伝学研究所, 遺伝形質研究系, 教授 (00311332)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2020: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Keywords神経科学 / 神経回路 / 生後発達 / 自発活動 / 体性感覚系 / マウス / 発達期可塑性 / カルシウムイメージング / 神経回路発達 / 神経活動 / バレル / マウス遺伝学 / 大脳皮質
Outline of Research at the Start

高等動物の神経回路は神経活動の影響を強く受けながら機能成熟する。生後発達初期の脳には外界からの刺激に依存しない「自発的な神経活動」が存在し、それが神経回路精緻化に重要な役割を担うことが、主に視覚系の研究で示されてきた。近年、発達期特異的な自発活動が広範な脳領域に存在することが明らかになりつつあり、その性質や役割に注目が集まっている。申請者らは新生仔期のマウス大脳皮質体性感覚野に「パッチワーク型」という、体性感覚回路の精緻化に適した特徴をもつ自発活動が存在することを発見した。本研究は、この新規タイプの自発活動の発生機序を理解することを目的として行う。

Outline of Final Research Achievements

Spontaneous activity during the early postnatal period is thought to be crucial for the establishment of mature neural circuits. We previously found “patchwork”-type spontaneous activity in the neonatal barrel cortex. In this study, by establishing an ex vivo calcium imaging system, we found that neurons in the whisker-innervating region of the trigeminal ganglion of neonatal mice generate spontaneous activity. A small percentage of neurons showed some obvious correlated activity, and these neurons were mostly located close to one another. Trigeminal ganglion spontaneous activity was majorly exhibited by large diameter neurons, a characteristic of mechanosensory neurons, and was blocked by chelation of extracellular calcium. Moreover, this activity was diminished by the adult stage. Spontaneous activity in the trigeminal ganglion during the first postnatal week could be a source of spontaneous activity observed in the neonatal mouse barrel cortex.

Academic Significance and Societal Importance of the Research Achievements

生後発達初期の脳には外界からの刺激に依存しない「自発的な神経活動」が存在し、神経回路精緻化に重要な役割を担う。近年、発達期特異的な自発活動は広範な脳領域に存在することが明らかになりつつあり、その性質に注目が集まっている。研究代表者らは、新生仔マウス大脳皮質体性感覚野に新規の時空間パターンをもつ自発活動が検出されることを見出していた。本研究は、この自発活動の発生機序を理解することを目的とした。マウス体性感覚野は回路精緻化機構の卓越したモデルであり、本研究の成果は、他のモダリティーでの研究との統合によって、発達期の神経回路精緻化機構の全体像の理解につながることが期待される。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (23 results)

All 2024 2023 2022 2021 2020

All Journal Article (12 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 12 results,  Open Access: 12 results) Presentation (11 results) (of which Int'l Joint Research: 9 results,  Invited: 5 results)

  • [Journal Article] Large-scale animal model study uncovers altered brain pH and lactate levels as a transdiagnostic endophenotype of neuropsychiatric disorders involving cognitive impairment2024

    • Author(s)
      Hagihara Hideo,Iwasato Takuji (22nd in 131 total), Tsuyoshi Miyakawa et al.
    • Journal Title

      eLife

      Volume: 12

    • DOI

      10.7554/elife.89376.3

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Short-Term Dendritic Dynamics of Neonatal Cortical Neurons Revealed by In Vivo Imaging with Improved Spatiotemporal Resolution2023

    • Author(s)
      Wang Luwei、Nakazawa Shingo、Luo Wenshu、Sato Takuya、Mizuno Hidenobu、Iwasato Takuji
    • Journal Title

      eNeuro

      Volume: 10 Issue: 11 Pages: 0142-23

    • DOI

      10.1523/eneuro.0142-23.2023

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Golgi polarity shift instructs dendritic refinement in the neonatal cortex by mediating NMDA receptor signaling2023

    • Author(s)
      Nakagawa Naoki、Iwasato Takuji
    • Journal Title

      Cell Reports

      Volume: 42 Issue: 8 Pages: 112843-112843

    • DOI

      10.1016/j.celrep.2023.112843

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spontaneous activity in whisker-innervating region of neonatal mouse trigeminal ganglion2022

    • Author(s)
      Banerjee Piu、Kubo Fumi、Nakaoka Hirofumi、Ajima Rieko、Sato Takuya、Hirata Tatsumi、Iwasato Takuji
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 16311-16311

    • DOI

      10.1038/s41598-022-20068-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ras GTPase-activating proteins control neuronal circuit development in barrel cortex layer 42022

    • Author(s)
      Rao Madhura S.、Mizuno Hiromi、Iwasato Takuji、Mizuno Hidenobu
    • Journal Title

      Frontiers in Neuroscience

      Volume: 16 Pages: 901774-901774

    • DOI

      10.3389/fnins.2022.901774

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thalamocortical axons control the cytoarchitecture of neocortical layers by area-specific supply of VGF2022

    • Author(s)
      Sato Haruka、Hatakeyama Jun、Iwasato Takuji、Araki Kimi、Yamamoto Nobuhiko、Shimamura Kenji
    • Journal Title

      eLife

      Volume: 11 Pages: 67549-67549

    • DOI

      10.7554/elife.67549

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Live imaging of avian epiblast and anterior mesendoderm grafting reveals the complexity of cell dynamics during early brain development2022

    • Author(s)
      Yoshihi Koya、Kato Kagayaki、Iida Hideaki、Teramoto Machiko、Kawamura Akihito、Watanabe Yusaku、Nunome Mitsuo、Nakano Mikiharu、Matsuda Yoichi、Sato Yuki、Mizuno Hidenobu、Iwasato Takuji、Ishii Yasuo、Kondoh Hisato
    • Journal Title

      Development

      Volume: 149 Issue: 6

    • DOI

      10.1242/dev.199999

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] An Early Cortical Progenitor-Specific Mechanism Regulates Thalamocortical Innervation2021

    • Author(s)
      Pal Suranjana、Dwivedi Deepanjali、Pramanik Tuli、Godbole Geeta、Iwasato Takuji、Jabaudon Denis、Bhalla Upinder S.、Tole Shubha
    • Journal Title

      The Journal of Neuroscience

      Volume: 41 Issue: 32 Pages: 6822-6835

    • DOI

      10.1523/jneurosci.0226-21.2021

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spatial organization and transitions of spontaneous neuronal activities in the developing sensory cortex2021

    • Author(s)
      Nakazawa Shingo、Iwasato Takuji
    • Journal Title

      Development, Growth & Differentiation

      Volume: 63 Issue: 6 Pages: 323-339

    • DOI

      10.1111/dgd.12739

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] NMDA Receptor Enhances Correlation of Spontaneous Activity in Neonatal Barrel Cortex2020

    • Author(s)
      Mizuno Hidenobu、Rao Madhura S.、Mizuno Hiromi、Sato Takuya、Nakazawa Shingo、Iwasato Takuji
    • Journal Title

      The Journal of Neuroscience

      Volume: 41 Issue: 6 Pages: 1207-1217

    • DOI

      10.1523/jneurosci.0527-20.2020

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] In vivo imaging of neural circuit formation in the neonatal mouse barrel cortex2020

    • Author(s)
      Iwasato Takuji
    • Journal Title

      Development, Growth & Differentiation

      Volume: 62 Issue: 7-8 Pages: 476-486

    • DOI

      10.1111/dgd.12693

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Developmental Phase Transitions in Spatial Organization of Spontaneous Activity in Postnatal Barrel Cortex Layer 4.2020

    • Author(s)
      Nakazawa, S., Yoshimura, Y., Takagi M., Mizuno H. & Iwasato T.
    • Journal Title

      J Neurosci.

      Volume: 2020 Sep 4;JN-RM Issue: 40 Pages: 1116-1120

    • DOI

      10.1523/jneurosci.1116-20.2020

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Studies of Dendritic Refinement using Mouse Barrel Cortex Layer 4 Neurons as a Model2023

    • Author(s)
      Takuji Iwasato
    • Organizer
      日本分子生物学会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 新生仔マウスの体性感覚野における神経回路精緻化と自発神経活動2023

    • Author(s)
      岩里琢治
    • Organizer
      日本発達神経科学会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Neuronal circuit refinement during postnatal development:Studies using the mouse barrel cortex2023

    • Author(s)
      岩里琢治
    • Organizer
      第22回「認識と形成」研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Activity-dependent circuit maturation in the neonatal brain: Studies using the mouse barrel cortex2023

    • Author(s)
      Takuji Iwasato
    • Organizer
      Tutored Seminar at Aix-Marseille University
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Investigating dendritic dynamics of barrel cortex layer 4 neurons in neonatal mouse via high spatiotemporal-resolution in vivo imaging2022

    • Author(s)
      Luwei Wang, Shingo Nakazawa, Hidenobu Mizuno, Takuji Iwasato
    • Organizer
      Society for Neuroscience 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigating dendritic dynamics of barrel cortex layer 4 neurons in neonatal mouse via high spatiotemporal-resolution in vivo imaging2022

    • Author(s)
      Luwei Wang, Shingo Nakazawa, Hidenobu Mizuno, Takuji Iwasato
    • Organizer
      Internatinal Symposium: Development and Plasticity of the Brain
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Examining dendritic plasticity of the barrel cortex layer 4 neurons via in vivo high spatiotemporal-resolution imaging2022

    • Author(s)
      Luwei Wang, Shingo Nakazawa, Hidenobu Mizuno, Takuji Iwasato
    • Organizer
      FENS Forum2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Exploring the dendritic refinement dynamics of cortical neurons via in vivo high spatiotemporal-resolution imaging2022

    • Author(s)
      Luwei Wang, Shingo Nakazawa, Hidenobu Mizuno, Takuji Iwasato
    • Organizer
      NEURO2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dendritic refinement of layer 4 neurons in the neonatal barrel cortex.2022

    • Author(s)
      Takuji Iwasato
    • Organizer
      NEURO2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] High spatiotemporal-resolution imaging of dendritic refinement dynamics of barrel cortex layer 4 neurons in neonates2021

    • Author(s)
      Luwei Wang, Shingo Nakazawa, Hidenobu Mizuno, Takuji Iwasato
    • Organizer
      Society for Neuroscience 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High spatiotemporal-resolution in vivo imaging of dendritic refinement dynamics in neonatal barrel cortex2021

    • Author(s)
      Luwei Wang, Shingo Nakazawa, Hidenobu Mizuno, Takuji Iwasato
    • Organizer
      Neuro2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2025-01-30  

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