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Elucidation for regulation of axonal extension and sensory recovery by Hedgehog signaling

Research Project

Project/Area Number 19K19225
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 57060:Surgical dentistry-related
Research InstitutionNiigata University

Principal Investigator

Sato-Yamada Yurie  新潟大学, 医歯学系, 助教 (20804537)

Project Period (FY) 2021-11-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords末梢神経 / 神経再生 / Hedgehogシグナル / 血管周囲細胞 / Gli1 / 血管 / Hedgehog signaling / Hedgehog signal
Outline of Research at the Start

下歯槽神経の損傷はしばしば痛覚過敏・感覚閾値の低下という、相反する症状を引き起こす。この発症メカニズムは未解明で、有効な治療法はない。感覚の回復には神経線維の 正確な伸長が不可欠であり、軸索伸長制御機構の解明は、異常感覚出現・病態把握に必須である。神経発生中、Hedgehog(Hh)シグナルは神経線維の伸長を制御するシグナルの一つであり、そのシグナル活性のバランスが神経線維の走行を規定している。本研究では、Hhシグナル活性を人為的に不均衡化したマウスに下歯槽神経損傷を施し、Hhシグナル活性バランスと軸索伸長、さらにその後に続く感覚回復の関係を検討する。

Outline of Final Research Achievements

We observed that Hh signaling responsive cells [Gli1(+) cells] in both the perineurium and endoneurium. In the endoneurium, Gli1(+) cells were classified as blood vessel associated or non-associated. After injury, Gli1(+) cells around blood vessels mainly proliferated to then accumulate into the injury site along with endothelial cells. Hh signaling activity was retained in Gli1(+) cells during nerve regeneration. To understand the role of Hedgehog signaling in Gli1(+) cells during nerve regeneration, we examined mice with Gli1(+) cells-specific inactivation of Hh signaling (Smo cKO). After injury, Smo cKO mice showed significantly reduced numbers of accumulated Gli1(+) cells along with disorganized vascularization at an early stage of nerve regeneration, which subsequently led to an abnormal extension of the axon. Thus, Hh signaling in Gli1(+) cells appears to be involved in nerve regeneration through controlling new blood vessel formation at an early stage.

Academic Significance and Societal Importance of the Research Achievements

末梢神経再生の分子メカニズムの詳細は分かっていない。そのため、神経損傷の根本的治療薬は現存しない。本研究では、損傷神経で活性化する、Hedgehogシグナルに着目して神経再生の分子機構の一部を明らかにした。Cre-loxPシステムを用いて神経再生過程におけるHhシグナルの発現時期と部位を、自由にコントロールし、Hhシグナルのバランスの揺らぎを人為的に再現する実験系を用いた。これによりHhシグナルの神経再生における詳細なメカニズムを検討することができた。本研究で得られた知見は神経の再生機構に基づく新たな末梢神経再生治療法の確立に寄与する可能性がある。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2019 Annual Research Report
  • Research Products

    (2 results)

All 2022 2020

All Journal Article (1 results) Presentation (1 results)

  • [Journal Article] Gli3 is a key factor in the Schwann cells from both intact and injured peripheral nerves2020

    • Author(s)
      Yurie Yamada Kenji Seo Supaluk Trakanant Jun Nihara Takehisa Kudo Makio Saeki Masayuki Kurose Daisuke Matsumaru Takeyasu Maeda Atsushi Ohazama
    • Journal Title

      Neuroscience

      Volume: 印刷中

    • Related Report
      2019 Annual Research Report
  • [Presentation] The role of perivascular fibroblast in peripheral nerve regeneration2022

    • Author(s)
      Yurie Yamada, Takeyasu Maeda
    • Organizer
      第45回分子生物学会年会
    • Related Report
      2022 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2025-01-30  

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