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Analysis of switching mechanisms for diurnal and nocturnal behaviors using Nile grass rats

Research Project

Project/Area Number 18K19330
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 44:Biology at cellular to organismal levels, and related fields
Research InstitutionUniversity of Toyama

Principal Investigator

Ikeda Masayuki  富山大学, 大学本部, 理事・副学長 (10288053)

Co-Investigator(Kenkyū-buntansha) 今野 紀文  富山大学, 学術研究部理学系, 講師 (50507051)
松田 恒平  富山大学, 学術研究部理学系, 教授 (60222303)
森岡 絵里  富山大学, 学術研究部理学系, 助教 (80756122)
Project Period (FY) 2018-06-29 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords体内時計 / 時計遺伝子 / 昼行性行動 / 脳地図 / 電気生理学 / グラスラット / モデル動物 / カルシウムイメージング / 活動電位 / ナイルグラスラット / GABA受容体 / 細胞内Ca2+
Outline of Final Research Achievements

Using our laboratory colony of Nile grass rats (Arvicanthis niloticus), the present study successfully cloned clock genes, Per1、Per2、Bmal1、Clock、Cry1、Cry2 in these rats. Also, circadian expression profiles of these genes were manifested in the suprachiasmatic nucleus (SCN) and hippocampus. In addition, sequences of clock genes were compared with those in other grass rat species (Arvicanthis ansorgei). Striking similarity was found for functional elements of clock genes. Electrophysiological experiments using grass rat brain slices demonstrated bimodal rhythms in spontaneous firing frequencies in SCN neurons. It was unlike a pattern of nocturnal rat SCN neurons (unimodal rhythms peak in the middle of daytime) and rather consistent with the behavioral rhythms of grass rats. We established experimental method for AAV vector microinjection in the hypothalamus of grass rats by referring originally-made grass rat brain map.

Academic Significance and Societal Importance of the Research Achievements

進化的に、ヒトを含めたいくつかの動物は、昼行性を獲得し、行動範囲を拡大してきたと考えられている。一方で、現代のヒトの行動時間は、もはや昼行性と呼ぶにはあまりに自由度が大きく、昼夜逆転の生活を常とする場合も少なくない。昼夜逆転の生活は、社会生活への不適合を招くばかりか、多様な疾病を併発する場合も多い。よって、昼夜行動選択のメカニズムの理解は、健康の維持増進にとっても重要な問題である。本研究では、昼行性グラスラットの遺伝子解析、脳地図作成、および電気生理学的な解析を可能とし、今後の波及的な研究のために必要な基礎データを取得した意味において、その学術的・社会的意義は大きいと考えられる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Book (1 results)

  • [Int'l Joint Research] ストラスブール大学(フランス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] ストラスブール大学INCI(フランス)

    • Related Report
      2018 Research-status Report
  • [Journal Article] 摂食抑制ペプチドとしてのコレシストキニンとレプチンの相互作用2021

    • Author(s)
      森岡絵里,池田真行
    • Journal Title

      実験医学 増刊

      Volume: 39巻5号 Pages: 66-71

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Intracellular interplay between cholecystokinin and leptin signalling for satiety control in rats2020

    • Author(s)
      Koizumi H, Mohammad S, Ozaki T, Muto K, Matsuba N, Kim J, Pan W, Morioka E, Mochizuki T & Ikeda M
    • Journal Title

      Scientific Reports

      Volume: 10 ( 1 ) Issue: 1 Pages: 12000-12000

    • DOI

      10.1038/s41598-020-69035-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 時計遺伝子と睡眠覚醒2020

    • Author(s)
      望月貴年、池田真行
    • Journal Title

      睡眠医療

      Volume: 14 Pages: 73-78

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Mitochondrial LETM1 drives intracellular proton rhythm in Drosophila pacemaker neurons2019

    • Author(s)
      森岡絵里,Todd C. Holmes,池田真行
    • Organizer
      第26回日本時間生物学会学術大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Effects of mitochondrial LETM1 knockdown on cytosolic calcium dynamics2019

    • Author(s)
      小泉隼人,森玉早貴,宮嶋梨沙,村山望,森岡絵里,池田真行
    • Organizer
      第26回日本時間生物学会学術大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Histamine H1 receptors regulate sleep and circadian clock oscillations: Implication from model studies using rats and human cell lines2018

    • Author(s)
      51.宮本翼、小泉隼人、纐纈貴大、橋野昇敬、森岡絵里、池田真行
    • Organizer
      The 9th congress of Asian Sleep Research Society (ASRS)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Remaining issues for the circadian control of animal behavior.2018

    • Author(s)
      池田真行
    • Organizer
      Oriental International Sleep Medicine Summit Forum
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] 睡眠学 第2版 第4章 睡眠・覚醒調節の液性機構 4.1 睡眠物質の生理学2020

    • Author(s)
      池田真行
    • Total Pages
      4
    • Publisher
      朝倉書房
    • Related Report
      2020 Annual Research Report

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Published: 2018-07-25   Modified: 2022-01-27  

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