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Cortical Motor Regulation in Reeler Mutants

Research Project

Project/Area Number 17K13053
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Rehabilitation science/Welfare engineering
Research InstitutionOsaka University

Principal Investigator

Mariko Hiraga  大阪大学, 歯学研究科, 講師 (50638757)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords運動制御 / リーラーマウス / 運動学習 / リーリン / 皮質層構造 / リポタンパク質 / リーラー / 大脳皮質機能 / リーリン欠損マウス / 脳梗塞 / 皮質脊髄路可塑性
Outline of Final Research Achievements

To investigate the mechanism that underlies cortical reorganization in motor map of cerebral cortex, we tested the possibility that reelin signaling contributed to behavior-related cortical reorganization. Reelin, a lipoprotein released by Cajal Retzius cells, is required for the normal development of cerebral cortical layers. We first found that a higher current threshold to evoke a muscle movement was two-three times higher in the homozygous reeler mice than in the WT. The tendency in homozygous mutants that required a higher threshold in upper layers than in lower cortical layers was similar to that found in the WT, even though the neural-type distribution is reversed across the cortical layers in the homozygous. We also found the lack of reelin did not directly affect the innervation terminals to the skeletal muscles. We finally showed that a reduction in cortical reorganization and impairment in behavior-related cortical LTP in the heterozygous reeler mice.

Academic Significance and Societal Importance of the Research Achievements

骨格筋-神経接合部位ではなく、大脳皮質や小脳でのリーリンの高次運動機能への関与が示された。ヒトの小脳萎縮では、骨格筋のatrophyが確認されていたが、reelinの発現低下から起こるのではなく、小脳萎縮に関連する運動機能障害による例えばdisuseから起こる2次的な結果だという事が明らかになった。リーリン発現の減少が起きる精神分裂症患者においても細かな高次運動機能の制限が認められているが、マウスモデルでは運動による運動野領域マップ再構築の低下及び、II/III層のLTP欠損を確認した。本成果はリーリンの高次機能可塑性への関与を示し、中枢神経運動機能疾患のさらなる原因解明が今後期待される。

Report

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

    (5 results)

All 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results)

  • [Journal Article] Developmental abnormality contributes to cortex-dependent motor impairments and higher intracortical current requirement in the reeler homozygous mutants2018

    • Author(s)
      Nishibe Mariko、Katsuyama Yu、Yamashita Toshihide
    • Journal Title

      Brain Structure and Function

      Volume: 印刷中 Issue: 6 Pages: 2575-2587

    • DOI

      10.1007/s00429-018-1647-8

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] リーラーマウスの大脳皮質出力2017

    • Author(s)
      西部真理子、山下俊英
    • Organizer
      第40回日本神経科学大会
    • Related Report
      2017 Research-status Report
  • [Presentation] リーラーマウスの骨格筋評価2017

    • Author(s)
      西部真理子、山下俊英
    • Organizer
      第5回骨格筋生物学研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] Reeler Motor Control2017

    • Author(s)
      西部真理子、山下俊英
    • Organizer
      第10回Motor Control研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] Cortical motor control of reeler mice.2017

    • Author(s)
      Nishibe, M., Katsuyama, Y., Yamashita, T.
    • Organizer
      The Annual Meeting for the Society for Neuroscience 2017
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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