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Distribution and characteristic of unmyelinated fibers in the central nervous system

Research Project

Project/Area Number 16K07005
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Neurophysiology / General neuroscience
Research InstitutionDoshisha University

Principal Investigator

Haruko Miyazaki  同志社大学, 研究開発推進機構, 助教 (80525890)

Co-Investigator(Kenkyū-buntansha) 下郡 智美  国立研究開発法人理化学研究所, 脳神経科学研究センター, チームリーダー (30391981)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords無髄神経 / 髄鞘 / ミエリン / アストロサイト / Nav1.2 / MBP / 電位依存性ナトリウムチャネル / ナトリウムチャネル / mTOR / 軸索 / 線条体投射神経 / 神経科学
Outline of Final Research Achievements

In the central nerve system, not all axons are myelinated. A large proportion of axons are unmyelinated but their distribution and function still unclear. Here, we identified parts of fibers in the corpus callosum and stria terminalis as novel unmyelinated fibers by immunostaining using anti-Nav1.2, which is a marker of unmyelinated fibers. To obtain the information relating to unmyelinated neurons/fibers, we generated gene expression profile of striatal medium spiny neurons, which are unmyelinated neurons. Next, we performed proteome analysis using MBP (+) and MBP (-) membrane fraction of striatal projection fibers and compared enriched proteins in each fraction. Gene ontology analysis of these data suggested that unmyelinated fibers may interact with glial cells on the surface of fibers and form synapses with other projection fibers. Indeed, we found the striatonigral fibers were surrounded by astrocyte processes by immunostaining using astrocyte markers.

Academic Significance and Societal Importance of the Research Achievements

本研究では、今まで知られていなかった中枢神経系の無髄領域を明らかにした。また、無髄神経線維はアストロサイトの突起で覆われていることを明らかにした。有髄神経は情報伝達スピードの速さという点では優れているが、微妙な調節や修正は無髄神経が担っている可能性がある。本研究を進めることにより、これまで分かっていなかった無髄神経の機能を解明できる可能性がある。またNav1.2の遺伝子であるSCN2Aはてんかんと自閉症スペクトラム症の原因遺伝子であることから、本研究を進めることによりこれらの疾患の病態への理解が深まり、治療法開発へ繋がる知見が得られると期待される。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 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: 1 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Non-coding RNA Neat1 and Abhd11os expressions are dysregulated in medium spiny neurons of Huntington disease model mice2018

    • Author(s)
      Park Hongsun、Miyazaki Haruko、Yamanaka Tomoyuki、Nukina Nobuyuki
    • Journal Title

      Neuroscience Research

      Volume: - Pages: 30551-0

    • DOI

      10.1016/j.neures.2018.10.013

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Parallel homodimer structures of the extracellular domains of the voltage-gated sodium channel β4 subunit explain its role in cell-cell adhesion.2017

    • Author(s)
      Shimizu H, Tosaki A, Ohsawa N, Ishizuka-Katsura Y, Shoji S, Miyazaki H, Oyama F, Terada T, Shirouzu M, Sekine SI, Nukina N, Yokoyama S.
    • Journal Title

      The Journal of Biological Chemistry

      Volume: 292 Issue: 32 Pages: 13428-13440

    • DOI

      10.1074/jbc.m117.786509

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 質量分析による線条体投射神経領域のMBP (+)、MBP (-)膜画分の解析2019

    • Author(s)
      宮﨑晴子、貫名信行
    • Organizer
      第42回日本神経科学大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 中枢無髄神経特異的分子の探索2018

    • Author(s)
      宮崎晴子、山野里紗、西岡佐紀、伊川正人
    • Organizer
      第41会 日本神経科学大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Gene expression profiling of medium spiny neurons in Huntington's disease model mouse2017

    • Author(s)
      Haruko Miyazaki, Fumitaka Oyama, Yoshihiro Kino, Masaru Kurosawa, Mizuki Kurosawa, Tomoyuki Yamanaka, Nobutaka Hattori, Tomomi Shimogori, Nobuyuki Nukina
    • Organizer
      XXIII World Congress of Neurology
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Gene expression profiling of medium spiny neurons in Huntington disease model mice2016

    • Author(s)
      Haruko Miyazaki, Fumitaka Oyama, Yoshihiro Kino, Masaru Kurosawa, Mizuki Kurosawa, Kenji Ohtawa, Nobutaka Hattori, Tomomi Shimogori, Nobuyuki Nukina
    • Organizer
      第39回日本神経科学大会
    • Place of Presentation
      パシフィコ横浜
    • Year and Date
      2016-07-20
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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