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Chemogenetic manipulation reveals pathway-specific functions of the cerebellar efferent of macaque monkeys

Research Project

Project/Area Number 19K07859
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 51030:Pathophysiologic neuroscience-related
Research InstitutionTokyo Metropolitan Institute of Medical Science

Principal Investigator

ISHIDA Hiroaki  公益財団法人東京都医学総合研究所, 精神行動医学研究分野, 主任研究員 (70728162)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords化学遺伝学 / 小脳遠心路 / PETイメージング / マカクザル / 運動障害 / 遺伝子導入 / アデノ随伴ウイルス / ムシモル / 小脳視床路 / 小脳損傷 / AAV / DREADDs
Outline of Research at the Start

小脳損傷後は多様な運動障害が現れる。損傷部位は小脳自体と投射経路に及ぶため、症状の原因が小脳自体の損傷が原因なのか、それとも、小脳を起始とする特定の神経経路の損傷が原因なのか因果関係を特定できなかった。そこで本研究は化学遺伝学的手法のうちDREADD法をサルに用い、小脳を起始とする小脳視床路、小脳赤核路を経路選択的に遮断する手法を開発する。小脳投射経路を選択的に遮断した後、サルの行動変化、神経活動の変化を正常時と対比し、各経路に特異的な機能的役割を明らかにする。この手法により小脳損傷後の運動障害が特定経路の損傷が原因で起こるのか、小脳全体の損傷が原因で起こるのかを因果関係を示し明らかにできる。

Outline of Final Research Achievements

The purpose of this study was to use chemogenetic methods to manipulate projection pathways in the cerebellum of monkeys to clarify the functional role of the pathways. AAV vectors expressing DREADD were injected into the dentate nucleus of the monkey cerebellum and expression levels were evaluated using positron emission tomography. After sufficient expression was confirmed in the monkey cerebellum, the projection pathway was reversibly blocked and changes in monkey reaching movements, muscle activity, and neural activity in each brain region were recorded. The analysis did not show an effect of the manipulation by DREADD. It is possible that temporary inhibition of unilateral cerebellar projection pathways does not cause changes due to the learning and adaptive ability of the cerebellum.

Academic Significance and Societal Importance of the Research Achievements

霊長類の脳を用いた遺伝子導入技術の確立を目指した。サルを用いて小脳投射経路の操作が実現することによって因果関係に基づいた神経経路機能が明らかになり、ヒト運動失調の病態理解や新しいリハビリテーション法の開発が促進される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (3 results)

All 2022 2021 2020

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

  • [Journal Article] Cerebellar outputs contribute to spontaneous and movement-related activity in the motor cortex of monkeys2020

    • Author(s)
      Sano Nobuya、Nakayama Yoshihisa、Ishida Hiroaki、Chiken Satomi、Hoshi Eiji、Nambu Atsushi、Nishimura Yukio
    • Journal Title

      Neuroscience Research

      Volume: - Pages: 10-21

    • DOI

      10.1016/j.neures.2020.03.010

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 霊長類における自己と他者の神経表象に関わる多シナプス性神経ネットワーク2022

    • Author(s)
      石田 裕昭
    • Organizer
      令和3年度京都大学霊長類研究所共同利用研究会(「霊長類の先進的遺伝子改変モデルを用いた神経ネットワークの構造と機能の解明」)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Neural circuits of metacognition and pathology of schizophrenia2021

    • Author(s)
      Hiroaki Ishida
    • Organizer
      The 44 th Annual Meeting of the Japan Neuroscience Society
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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