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2013 Fiscal Year Final Research Report

Morphological approach to mechanisms of light input and synchronization to the circadian oscillator

Research Project

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Project/Area Number 23590248
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field General anatomy (including Histology/Embryology)
Research InstitutionKinki University

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) KOINUMA Satoshi  近畿大学, 医学部, 講師 (10340770)
MASUMOTO Kohei  近畿大学, 医学部, 助教 (60580529)
Project Period (FY) 2011 – 2013
Keywords視交叉上核 / 同調機構
Research Abstract

We investigated the mechanisms of light input and synchronization in the suprachiasmatic nucleus (SCN). Using rPer2 promoter::Luciferase rat, we have found that the SCN is divided into two regions in relevance to period length. One of which showed medial region of the SCN containing oscillators with a period shorter than 24 hours (SPR) and lateral region with a period longer than 24 hours (LPR). And we have found that synchrony between SPR and LPR is possibly attained by cAMP signaling. Then, We observed Per1 and cFos induction in the SCN by light when the environmental LD cycle (12:12-h) was abruptly changed to dissociate the dorsomedial SCN (DMSCN) and ventrolateral SCN (VLSCN). As a result, the phase shifting of the gate corresponded well with that of the DMSCN. The finding suggested that the DMSCN determines the phase of the gate.

  • Research Products

    (7 results)

All 2013 2012 2011 Other

All Journal Article (5 results) (of which Peer Reviewed: 4 results) Presentation (2 results)

  • [Journal Article] Regional circadian period difference in the suprachiasmatic nucleus of the mammalian circadian center2013

    • Author(s)
      Koinuma S,Asakawa T,Nagano M,Furukawa K,Sujino M,Masumoto KH,Nakajima Y,Hashimoto S,Yagita K,Shigeyoshi Y
    • Journal Title

      Eur J Neurosci

      Volume: 38 Pages: 2832-4l

    • DOI

      10.1111/ejn.12308

    • Peer Reviewed
  • [Journal Article] Circadian expression and specific localization of a sialyltransferase gene in the suprachiasmatic nucleus2013

    • Author(s)
      Hamada Y,Saigoh K,Masumoto KH,Nagano M,Kusunoki S,Shigeyoshi Y
    • Journal Title

      Neurosci Lett

      Volume: 535 Pages: 12-7

    • DOI

      10.1016/j.neulet.2012.12.032.

    • Peer Reviewed
  • [Journal Article] Differential Entrainment of Peripheral Clocks in the Rat by Glucocorticoid and Feeding2012

    • Author(s)
      Sujino M,Furukawa K,Koinuma S,Fujioka A,Nagano M,Iigo M,Shigeyoshi Y
    • Journal Title

      Endocrinology

      Volume: l53 Pages: 2277-86

    • DOI

      10.1210/en.2011-1794

    • Peer Reviewed
  • [Journal Article] Quantitative expression profile of distinct functional regions in the adult mouse brain2011

    • Author(s)
      Kasukawa T,Masumoto KH,Nikaido I,Nagano M,Uno KD,Tsujino K,Hanashima C,Shigeyoshi Y,Ueda HR
    • Journal Title

      PLoS One

      Volume: 6 Pages: e23228

    • DOI

      10.1371/journal.pone.0023228

    • Peer Reviewed
  • [Journal Article]

    • Author(s)
      他5件
  • [Presentation] 甫乳類体内時計中枢視交叉上核における光入力制御機構の局在2013

    • Author(s)
      長野護
    • Organizer
      第ll7回日本解剖学会
    • Place of Presentation
      山梨大学(山梨県)
    • Year and Date
      2013-03-28
  • [Presentation] ラットの体内時計中枢である視交叉上核における光入力制御機構の局在2012

    • Author(s)
      長野護
    • Organizer
      第l9回日本時間生物学会大会
    • Place of Presentation
      北海道大学(札幌)
    • Year and Date
      2012-09-15

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Published: 2015-07-16  

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