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nalysis of neural networks generating masticatory movements based on Phox2B-positive neurons

Research Project

Project/Area Number 19K10061
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57010:Oral biological science-related
Research InstitutionShowa University

Principal Investigator

Nakayama Kiyomi  昭和大学, 歯学部, 講師 (00433798)

Co-Investigator(Kenkyū-buntansha) 井上 富雄  昭和大学, 歯学部, 教授 (70184760)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
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: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsPhox2B / 咀嚼 / 顎運動 / チャネルロドプシン / 孤束核 / 咀嚼運動 / Phox2b / 神経回路 / 脳幹 / 三叉神経上核
Outline of Research at the Start

ヒトが生きていくためのエネルギーを摂取するため、咀嚼運動は非常に重要な役割を果たしている。また、咀嚼運動は脳の血流の上昇による神経活動の上昇をもたらすことから、子供の知育を助け高齢者の認知症予防に繋がると考えられている。咀嚼運動時の顎の動きは、脳幹に存在するリズムジェネレーターと呼ばれる神経回路でつくられることが知られている。この神経回路の構成について知ることは、脳血管疾患の後遺症や神経変性疾患等による運動障害性咀嚼障害を根本的に改善するために重要である。本研究では、このリズムジェネレーターの構成要素である神経細胞の局在や性質、入出力を光遺伝学の手法を用いて明らかにする。

Outline of Final Research Achievements

Mastication is an important movement for efficient energy intake in humans, although the neural networks that generate rhythmic jaw movements during mastication are poorly understood. In the present study, we have shown that neurons that express the paired-like homeobox 2B (PHOX2B) gene in the medullary solitary nucleus in the brainstem play an important role in the generation of rhythmic jaw movements. The neurons sent abundant projections to the supratrigeminal nucleus, the intermediate reticular nucleus, and the nucleus paragigantocellularis posterior. Among these nuclei, projections to the intermediate reticular nucleus and the nucleus paragigantocellularis posterior were suggested to be involved in the rhythm generation of mastication.

Academic Significance and Societal Importance of the Research Achievements

咀嚼運動はヒトが生きていくためのエネルギーを食物から効率良く摂取するためにも、脳の活性化を促し健康寿命を延ばすためにも重要な運動である。本研究では、Phox2Bという遺伝子を発現するニューロンの活動を、光遺伝学の技術を用いてコントロールし、咀嚼のリズムジェネレーターを構成する神経回路の一部を明らかにした。この方法は、咀嚼の神経回路の解明に貢献する新たな技術であり、今後、神経回路の解明が飛躍的に進む事が期待される。その結果、高齢者の運動性咀嚼障害の改善のための基礎的知識を得て、健康長寿の実現に貢献することが出来ると考える。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2023 2020 2019

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] Involvement of ghrelin in the regulation of swallowing motor activity in an arterially perfused rat preparation2023

    • Author(s)
      Ishiguro Mitsunori、Nakayama Kiyomi、Nakamura Shiro、Mochizuki Ayako、Dantsuji Masanori、Ihara Yoshiaki、Inoue Tomio
    • Journal Title

      Brain Research Bulletin

      Volume: 192 Pages: 62-69

    • DOI

      10.1016/j.brainresbull.2022.11.006

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Responses evoked by electrical stimulation of the brainstem reticular formation in the jaw-opening and hypoglossal motor nerves of an arterially perfused rat preparation2020

    • Author(s)
      Ofuji Takuo、Nakayama Kiyomi、Nakamura Shiro、Mochizuki Ayako、Dantsuji Masanori、Ishiguro Mitsunori、Yamamoto Matsuo、Inoue Tomio
    • Journal Title

      Neuroscience Letters

      Volume: 738 Pages: 135400-135400

    • DOI

      10.1016/j.neulet.2020.135400

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Ghrelin-induced enhancement of swallowing motor activity in an arterially perfused rat preparation.2023

    • Author(s)
      Ishiguro M, Nakayama K, Nakamura S, Mochizuki A, Dantsuji M, Ihara Y, Inoue T.
    • Organizer
      第100回 日本生理学学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Responses evoked by electrical stimulation of the brainstem reticular formation in the mylohyoid and hypoglossal nerves of an arterially perfused rat preparation2020

    • Author(s)
      Nakayama K, Ofuji T, Nakamura S, Mochizuki A, Dantsuji M, Ishiguro M, Yamamoto M, Inoue T
    • Organizer
      第43回 日本神経科学大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Facilitatory effects of the ACE inhibitor imidapril on swallowing motor activity in nerves innervating the infrahyoid and laryngeal muscles in an arterially perfused rat preparation2020

    • Author(s)
      Inoue T, Moriya T, Nakayama K, Nakamura S, Mochizuki A, Dantsuji M, Shirota T
    • Organizer
      FENS2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Induction of masticatory rhythmic motor activity using in situ rat preparation2019

    • Author(s)
      Ofuji T, Nakayama K, Nakamura S, Mochizuki A, Dantsuji M, Inoue T
    • Organizer
      第63回日本顎口腔機能学会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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