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Neural connections between the oculomotor neural integrators and the vestibulocerebellum

Research Project

Project/Area Number 19K16295
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 46030:Function of nervous system-related
Research InstitutionNara Medical University

Principal Investigator

Sugimura Taketoshi  奈良県立医科大学, 医学部, 助教 (60812526)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords視線保持 / 舌下神経前位核 / 神経積分器 / コリン作動性ニューロン / 前庭小脳 / 小脳 / カハール間質核 / 片葉 / 虫部垂 / 小節 / 視線制御
Outline of Research at the Start

視覚を適切に働かせるには視線を保持することで視覚対象を網膜上で静止させる必要がある。視線保持には脳幹の舌下神経前位核(PHN)やカハール間質核(INC)と前庭小脳との神経ネットワークが重要であると考えられているが、その詳細は不明である。本研究では、前庭小脳へ投射するPHNやINCのニューロンのタイプや分布を形態学的、電気生理学的に明らかにすることで、視線保持のメカニズム解明に迫ることを研究目的とする。

Outline of Final Research Achievements

Cerebellar functions are modulated by cholinergic inputs, the density of which varies among cerebellar regions. Although the prepositus hypoglossi nucleus (PHN), a brainstem structure involved in controlling gaze holding, is known as one of the major sources of these cholinergic inputs, the proportions of cholinergic neurons in PHN projections to distinct cerebellar regions have not been quantitatively analyzed. In this study, we identified PHN neurons projecting to the cerebellum by applying retrograde labeling with dextran-conjugated Alexa 488 in choline acetyltransferase (ChAT)-tdTomato transgenic rats and compared the proportion of cholinergic neurons in the PHN projections to four different regions of the cerebellum. The results suggest that the proportion of cholinergic neurons among cerebellar projections from the PHN differs depending on cerebellar target areas and the rostro-caudal regions of the PHN.

Academic Significance and Societal Importance of the Research Achievements

視覚を適切に働かせるには視線を保持することで視覚対象を網膜上で静止させる必要がある。視線の保持には神経積分器と呼ばれる脳幹の領域と前庭小脳との神経ネットワークが重要であることが示唆されているが、その神経回路についての実験的知見は乏しく詳細は明らかにされていない。本研究は、水平性視線保持に関与する神経積分器であるPHNと小脳との神経回路について、特にコリン作動性ニューロンに着目した新たな知見を提供した。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2020 2019

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

  • [Journal Article] Distinct proportions of cholinergic neurons in the rat prepositus hypoglossi nucleus according to their cerebellar projection targets2020

    • Author(s)
      Sugimura Taketoshi、Saito Yasuhiko
    • Journal Title

      Journal of Comparative Neurology

      Volume: 529 Issue: 7 Pages: 1541-1552

    • DOI

      10.1002/cne.25035

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Different Activation Mechanisms of Excitatory Networks in the Rat Oculomotor Integrators for Vertical and Horizontal Gaze Holding2019

    • Author(s)
      Saito Yasuhiko、Sugimura Taketoshi
    • Journal Title

      eneuro

      Volume: 7 Issue: 1 Pages: 0364-19

    • DOI

      10.1523/eneuro.0364-19.2019

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Neural connections between oculomotor neural integrators and vestibulo-cerebellum2019

    • Author(s)
      Sugimura T, Saito Y
    • Organizer
      Society of Neuroscience 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] The neural connections between the oculomotor neural integrators and the vestibulo-cerebellum2019

    • Author(s)
      Sugimura T, Saito Y
    • Organizer
      第42回日本神経科学大会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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