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Analysis of the axon initial segment plasticity using organotypic slice culture

Research Project

Project/Area Number 16K07345
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Cell biology
Research InstitutionNagoya University

Principal Investigator

ADACHI Ryota  名古屋大学, 医学系研究科, 特任助教 (00436057)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords蝸牛神経核 / 脳幹切片培養 / 電位依存性K+チャネル / 周波数局在性 / 軸索起始部 / 活動依存的可塑性 / 電位依存性Kチャネル / 聴覚神経 / 大細胞核
Outline of Final Research Achievements

Tonotopic differentiations of ion channels ensure sound processing across frequencies. In organotypic culture of chicken cochlear nucleus, Kv1.1 was down-regulated and not differentiated tonotopically. Chronic depolarization increased Kv1.1 expression in the cells at higher-frequency regions, which restored the differentiation. The depolarization increased Kv1.1 via activation of calcium channels, whereas basal Ca2+ level elevated similarly irrespective of tonotopic regions. Thus, the efficiency of Ca2+-dependent Kv1.1 expression would be fine-tuned in a tonotopic-region-specific manner, emphasizing the importance of neuronal tonotopic identity as well as pattern of afferent input in the tonotopic differentiation of the channel in the auditory circuit.

Academic Significance and Societal Importance of the Research Achievements

神経回路は脳を正しく機能させる為に形成、維持される。発達過程においては脳の各領域においてそれぞれの特性を持った回路が形成され、その後は外部からの刺激に応じて可塑的な変化を起こして機能的な回路を維持してゆく。これまでは神経特異的な性質の獲得には、入力が大部分を占めていると考えられてきた。しかしながら本研究は、入力も引き金として重要ではあるが、神経細胞自体の性質が異なっており、その運命に従って分化することを示した。各神経回路が特性を獲得する機構を理解することは脳機能の正しい理解に繋がると考える。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 2017 2016

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Tonotopic Differentiation of Coupling between Ca2+ and Kv1.1 Expression in Brainstem Auditory Circuit.2019

    • Author(s)
      Adachi R, Yamada R, Kuba H.
    • Journal Title

      iScience

      Volume: 13 Pages: 199-213

    • DOI

      10.1016/j.isci.2019.02.022

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Auditory input shapes tonotopic differentiation of Kv1.1 expression in avian cochlear nucleus during late development2018

    • Author(s)
      Nargis Akter, Ryota Adachi, Akitoshi Kato, Ryota Fukaya, Hiroshi Kuba
    • Journal Title

      Journal of Neuroscience

      Volume: 38 Issue: 12 Pages: 2967-2980

    • DOI

      10.1523/jneurosci.2472-17.2018

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Differentiation of intracellular Ca2+ sensitivity underlies tonotopic-region-specific Kv1.1 expression in avian cochlear nucleus2018

    • Author(s)
      Ryota Adachi, Rei Yamada, Hiroshi Kuba
    • Organizer
      Latest Advances in Development & Function of Neuronal Circuit, Cold Spring Harbor Asia
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] トリ蝸牛神経核培養細胞における軸索起始部の可塑性機構2017

    • Author(s)
      安達良太、藤井論、Israt Jahan、久場博司
    • Organizer
      新学術領域研究「スクラップ&ビルドによる脳機能の動的制御」第2回領域会議
    • Related Report
      2017 Research-status Report
  • [Presentation] トリ聴覚神経核の活動依存的な機能分化2016

    • Author(s)
      安達良太、久場博司
    • Organizer
      第63回中部日本生理学会
    • Place of Presentation
      岡崎コンファレンスセンター(愛知県岡崎市)
    • Year and Date
      2016-11-04
    • Related Report
      2016 Research-status Report
  • [Presentation] 大細胞核の活動依存的な機能分化2016

    • Author(s)
      安達良太、久場博司
    • Organizer
      第39回日本神経科学大会
    • Place of Presentation
      パシフィコ横浜(神奈川県横浜市)
    • Year and Date
      2016-07-20
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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