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The mechanism of photic input transmission in response to light and dark environmental changes in the suprachiasmatic nucleus.

Research Project

Project/Area Number 20K07234
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 48010:Anatomy-related
Research InstitutionKindai University

Principal Investigator

Nagano Mamoru  近畿大学, 医学部, 准教授 (80155960)

Co-Investigator(Kenkyū-buntansha) 鯉沼 聡  近畿大学, 医学部, 講師 (10340770)
筋野 貢  近畿大学, 医学部, 助教 (30460843)
Project Period (FY) 2020-04-01 – 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 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords視交叉上核 / 光同調 / 時差症候群 / 概日時計 / 短周期領域 / 長周期領域 / Syt17 遺伝子 / 脱同期 / BMAL1 / 概日リズム / 位相シフト / 同調 / 同調機構
Outline of Research at the Start

本研究はマウスを用いて形態学的および分子生物学的な手法とスライス培養実験により解析を進め、視交叉上核の各領域内での細胞間や領域間における同期システム及び明暗環境の変化に対する光入力伝達機構を明らかにして、視交叉上核における同調機構とその光入力による制御機構を解明する。
これらの研究成果により、時差症候群の分子機構を明らかにするとともに時差症候群の早期に解消できる方策の確立を試みる。

Outline of Final Research Achievements

We have elucidated the inter-cellular and inter-regional synchronization system within each region of the suprachiasmatic nucleus (SCN), the center of the internal clock, and the mechanism of light input transmission in response to changes in light and dark environments. We found that light-dark changes cause not only desynchronization between light- and non-light-responsive regions but also interregional desynchronization in the non-photoresponsive region in the SCN. In addition, we found that the longer circadian rhythm of the rostral region appears to entrain the circadian rhythm in the caudal region in the SCN.

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、時差症候群が生じるのかという疑問に対して、体内時計の中枢である視交叉上核における単に光反応領域と非光反応領域間の脱同調のみならず、非光反応領域内においても領域間の脱同調が生じることを明らかにしたもので、時差症候群の原因解明および解消法の早期開発に繋がるものと考える。また、時差症候群の早期解消にとどまらず、体内時計の明暗環境への適応システムの解明に繋がり、リズム障害治療に大いに役立つとともにシフトワーカーの生活習慣病の治療薬などの開発につながるものとして期待される。

Report

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

    (5 results)

All 2023 2022 2021 2020

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 3 results)

  • [Journal Article] Circadian expression and specific localization of synaptotagmin17 in the suprachiasmatic nucleus, the master circadian oscillator in mammals2023

    • Author(s)
      Fujioka Atsuko、Nagano Mamoru、Ikegami Keisuke、Masumoto Koh-hei、Yoshikawa Tomoko、Koinuma Satoshi、Nakahama Ken-ichi、Shigeyoshi Yasufumi
    • Journal Title

      Brain Research

      Volume: 1798 Pages: 148129-148129

    • DOI

      10.1016/j.brainres.2022.148129

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Regionality of short and long period oscillators in the suprachiasmatic nucleus and their manner of synchronization2022

    • Author(s)
      Morimoto Tadamitsu、Yoshikawa Tomoko、Nagano Mamoru、Shigeyoshi Yasufumi
    • Journal Title

      PLOS ONE

      Volume: 17 Issue: 10 Pages: e0276372-e0276372

    • DOI

      10.1371/journal.pone.0276372

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Transgenic rats expressing dominant negative BMAL1 showed circadian clock amplitude reduction and rapid recovery from jet lag2021

    • Author(s)
      Minami Yoichi、Yoshikawa Tomoko、Nagano Mamoru、Koinuma Satoshi、Morimoto Tadamitsu、Fujioka Atsuko、Furukawa Keiichi、Ikegami Keisuke、Tatemizo Atsuhiro、Egawa Kentaro、Tamaru Teruya、Taniguchi Taizo、Shigeyoshi Yasufumi
    • Journal Title

      European Journal of Neuroscience

      Volume: 53 Issue: 6 Pages: 1783-1793

    • DOI

      10.1111/ejn.15085

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] cAMP response element induces Per1 in vivo.2020

    • Author(s)
      Ikegami K, Nakajima M, Minami Y, Nagano M, Masubuchi S, Shigeyoshi Y.
    • Journal Title

      Biochem Biophys Res Commun.

      Volume: 531 Issue: 4 Pages: 515-521

    • DOI

      10.1016/j.bbrc.2020.07.105

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Circadian rhythms of soting nexin 25 in the mouse suprachiasmatic nucleus2020

    • Author(s)
      Takemura S, Nagano M, Isonishi A, Tanaka T, Tatsumi K, Yamano M, Minami Y, Shigeyoshi Y, Wanaka A
    • Journal Title

      Neuroscience Letter

      Volume: 727 Pages: 134897-134897

    • DOI

      10.1016/j.neulet.2020.134897

    • Related Report
      2020 Research-status Report
    • Peer Reviewed

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Published: 2020-04-28   Modified: 2024-01-30  

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