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RET signaling levels control development of the enteric nervous system

Research Project

Project/Area Number 16K08466
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field General anatomy (including histology/embryology)
Research InstitutionKobe University

Principal Investigator

Uesaka Toshihiro  神戸大学, 医学研究科, 准教授 (90304451)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords受容体チロシンキナーゼ / 腸管神経前駆細胞 / 疾患モデルマウス / RET / 疾患モデル / 細胞移動 / 神経分化 / 腸管神経系 / Retチロシンキナーゼ / 変異体ノックインマウス / 恒常的活性型チロシンキナーゼ / 神経栄養因子GDNF / 恒常的活性化チロシンキナーゼ / 細胞・組織 / 発生・分化 / シグナル伝達
Outline of Final Research Achievements

Constitutive activation of RET in medullary thyroid carcinoma (MTC) occurs mainly through the substitution of a single amino acid in the cysteine-rich domain. We generated a new mouse model for MEN2A harboring RET(C618F) mutation. Mice expressing RET(C618F) exhibit mild C cell hyperplasia and increased numbers of enteric neurons, indicating that RET(C618F) confers gain-of-function phenotypes. In contrast, decreased amount of RET(C618F) with its high activity confers susceptibility to intestinal aganglionosis. In reduced RET(C618F) embryos, induction of premature neuronal differentiation causes impaired neural precursor migration. These findings suggest that proliferation, migration, and neuronal differentiation are exquisitely regulated by both the activation levels and total amount of RET.

Academic Significance and Societal Importance of the Research Achievements

腸管神経系の形成は、マウスやヒトにおいて胎児期中期から始まり、生後離乳期あたりまで続く。この長い発生過程において神経栄養因子GDNF-RETシグナルが様々な細胞イベントを制御している。RETの活性化レベルが比較的低く保たれている状態で、前駆細胞の未分化性が維持され、細胞移動が行われるが、活性化レベルが通常より高まると、ニューロンへの分化が促進されることが、本研究の変異マウスにより、裏付けられた。一つの分泌性調節因子によるRETの活性化レベルの絶妙な変化が発生過程の制御にいかに重要であるかが示され、発生機序だけでなく、破綻による発生異常の機序の理解につながる成果である。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2019 2018 2017 2016

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Mice conditionally expressing RET(C618F) mutation display C cell hyperplasia and hyperganglionosis of the enteric nervous system2019

    • Author(s)
      Okamoto M, Yoshioka Y, Maeda K, Bito Y, Fukumoto T, Uesaka T, Enomoto H
    • Journal Title

      Genesis

      Volume: Epub ahead of print Issue: 5 Pages: 1-8

    • DOI

      10.1002/dvg.23292

    • NAID

      120006996909

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of the intrinsic and extrinsic innervation of the gut.2016

    • Author(s)
      Uesaka T, Young HM, Pachnis V, Enomoto H.
    • Journal Title

      Dev. Biol.

      Volume: 417 Issue: 2 Pages: 158-167

    • DOI

      10.1016/j.ydbio.2016.04.016

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 腸管神経系の形成不全後のシュワン細胞系譜からの腸管ニューロン産生2019

    • Author(s)
      上坂敏弘
    • Organizer
      第124回日本解剖学会総会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Formation of enteric nervous system from Schwann cell precursors in mouse models of Hirschsprung disease2018

    • Author(s)
      Uesaka T
    • Organizer
      International Symposium “Development of the enteric nervous system: cells, signals, genes, and therapy
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Enteric neurogenesis from Schwann cell lineage in mouse models of Hirschsprung disease2017

    • Author(s)
      Toshihiro Uesaka
    • Organizer
      第40回日本神経科学大会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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