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Atrial fibrillation and uncoupling : Changing of gap junction by aging produces the abnormal impulse propagation and associated arrhythmias.

Research Project

Project/Area Number 19790546
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Circulatory organs internal medicine
Research InstitutionHyogo College of Medicine

Principal Investigator

MASUMIYA Haruko  Hyogo College of Medicine, 医学部, 助教 (30286744)

Project Period (FY) 2007 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥3,810,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥510,000)
Fiscal Year 2008: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2007: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywords循環器 / 心房細動 / コネキシン / 自動能 / 洞房結節 / aging
Research Abstract

申請者は心房細動をはじめとする異所性自動能の潜在的な発生メカニズムを解明し、従来のような不整脈が発生した場合のdown-stream治療法に代わる、病態の本質を治療の対象とするup-stream治療法の確立を目的としている。本研究はその全体プロジェクトの中で心房細動とコネキシン(gap junction)に焦点を絞り、agingに伴った正常および異所性自動能発生とその伝播過程でのコネキシンの生理的役割の解明を目指した。
本研究期間においては最初に正常なリズムに関する検討を行った。洞房結節標本の光学的膜電位計測法による実験系とその解析法をウサギ摘出洞房結節標本にて確立し、自動拍動の発生には個々の洞房結節細胞の性質とgap junction を介した細胞間の相互作用が寄与していること、またこれまでに報告されている以上に洞房結節領域内は電気生理学的に複雑であることを明らかにした。
現在はagingが及ぼす自動拍動の発生とその興奮伝播に対する影響を若年と老年ラットの洞房結節を標本として、膜電位イメージング法にて比較・検討中である。

Report

(3 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • Research Products

    (22 results)

All 2009 2008 2007 Other

All Journal Article (16 results) (of which Peer Reviewed: 16 results) Presentation (6 results)

  • [Journal Article] Inhomogeneous distribution of action potential characteristics in the rabbit sino-atrial node revealed by voltage imaging2009

    • Author(s)
      Masumiya H, Oku Y, Okada Y.
    • Journal Title

      J. Physiol. Sci. May 59(3)

      Pages: 227-241

    • NAID

      10025218875

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Mitsugumin 53- mediated maintenance of K+ currents in cardiac myocytes2009

    • Author(s)
      Masumiya H, Asaumi Y, Nishi M, Minamisawa S, Adachi-Akahane S, Yoshida M, Kangawa K, Ito K, Kagaya Y, Yanagisawa T, Yamazaki T, Ma J, Takeshima H.
    • Journal Title

      Channels. Jan-Feb 3(1)

      Pages: 6-11

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] MG53 nucleates assembly of cell membrane repair machinery2009

    • Author(s)
      Cai C, Masumiya H, Weisleder N, Matsuda N, Nishi M, Hwang M, Ko JK, Lin P, Thornton A, Zhao X, Pan Z, Komazaki S, Brotto M, Takeshima H, Ma J
    • Journal Title

      Nature Cell Biology. Jan 11(1)

      Pages: 56-64

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] MG53 regulates membrane budding and exocytosis in muscle cells2009

    • Author(s)
      Cai C, Masumiya H, Weisleder N, Pan Z, Nishi M, Ko J-K, Komazaki S, Takeshima H, Ma J
    • Journal Title

      J. Biol. Chem. Jan 30 284(5)

      Pages: 3314-3322

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Mitsugumin 53-mediated maintenance of K^+ currents in cardiac myocytes2009

    • Author(s)
      Masumiya H, et.al.
    • Journal Title

      Channels 3(1)

      Pages: 6-11

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spatiotemporal organization of frog respiratory neurons visualized on the ventral medullary surface2008

    • Author(s)
      Oku Y, Kimura N, Masumiya H, Okada Y.
    • Journal Title

      Respir Physiol Neurobiol 161

      Pages: 281-290

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Potentiation of potassium currents by beta-adrenoceptor agonists in human urinary bladder smooth muscle cells: a possible electrical mechanism of relaxation2008

    • Author(s)
      Takemoto J, Masumiya H, Nunoki K, Sato T, Nakagawa H, Ikeda Y, Arai Y, Yanagisawa T.
    • Journal Title

      Pharmacology 81

      Pages: 251-258

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Cholesterol depletion modulates basal L-type Ca2+ current and abolishes its -adrenergic enhancement in ventricular myocytes2008

    • Author(s)
      Tsujikawa H, Song Y, Watanabe M, Masumiya H, Gupote SA, Ochi R, Okada T
    • Journal Title

      Am J Physiol Heart Circ Physiol 294(1)

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Cholesterol depletion modulates basal L-type Ca^<2+> current and abolishes its-adrenergic enhancement in ventricular myocytes2008

    • Author(s)
      Tsujikawa H, et.al.
    • Journal Title

      Am J Physiol Heart Circ Physiol 294(1)

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cholesterol depletion modulates basal L-type Ca^<2+> current and abolishes its adrenargic enhancement in ventricular myocytes2008

    • Author(s)
      Tsujikawa H, et. al.
    • Journal Title

      Am J Physiol Heart Circ Physiol. 294

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Chemosensitive neuronal network organization in the ventral medulla analyzed by dynamic voltage-imaging2007

    • Author(s)
      Okada Y, Kuwana S, Masumiya H, Kimura N, Chen Z, Oku Y
    • Journal Title

      Adv Exp Biol Med 605

      Pages: 353-358

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Respiratory and metabolic acidosis differentially affect the respiratory neuronal network in the ventral medulla of neonatal rats2007

    • Author(s)
      Okada Y, Tamura Y, Masumiya H, Oku Y.
    • Journal Title

      Eur J Neurosci 26(10)

      Pages: 2834-2843

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Postnatal developmental changes in activation profiles of the respiratory neuronal network in the rat ventral medulla2007

    • Author(s)
      Oku Y, Masumiya H, Okada Y.
    • Journal Title

      J Physiol 585

      Pages: 175-186

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Postnatal developmental changes in activation profiles of the respiratory neuronal network in the rat ventral medulla2007

    • Author(s)
      Oku Y, et. al.
    • Journal Title

      J Physiol. 585

      Pages: 175-186

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Respiratory and metabolic acidosis differentially affect the respiratory neuronal network in the ventral medulla of neonatal rats2007

    • Author(s)
      Okada Y, et. al.
    • Journal Title

      Eur J Neurosci 26

      Pages: 2834-2894

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Inhomogeneous distribution of action potential characteristics in the rabbit sino-atrial node revealed by voltage imaging

    • Author(s)
      Masumiya H, et.al.
    • Journal Title

      J. Physiol.Sci (In press)

    • NAID

      10025218875

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Presentation] Dynamic imaging analysis of the pacemaker activity within the rabbit sino-atrial node.2008

    • Author(s)
      Masumiya H, et. al.
    • Organizer
      日本生理学会年会
    • Place of Presentation
      東京
    • Year and Date
      2008-03-26
    • Related Report
      2007 Annual Research Report
  • [Presentation] ウサギ洞房結節領域における興奮伝播の膜電位イメージング解析2008

    • Author(s)
      増宮晴子,岡田泰昌,越久仁敬
    • Organizer
      第85回日本生理学会大会
    • Place of Presentation
      東京
    • Related Report
      2008 Final Research Report
  • [Presentation] Homology of respiratory neuronal networks between frogs and rats: The brain adapts itself to the mode of ventilation2007

    • Author(s)
      Oku Y, Masumiya H, and Okada Y.
    • Organizer
      5th Congress of the International Society for Autonomic Neuroscience (ISAN)
    • Place of Presentation
      京都テルサ、Kyoto
    • Related Report
      2008 Final Research Report
  • [Presentation] Differential effects of respiratory and metabolic acidosis on the respiratory neuron network analyzed by voltage-imaging.2007

    • Author(s)
      Okada Y, Masumiya H, and Oku Y.
    • Organizer
      5th Congress of the International Society for Autonomic Neuroscience (ISAN),
    • Place of Presentation
      京都テルサ、Kyoto
    • Related Report
      2008 Final Research Report
  • [Presentation] カエル脳幹部呼吸神経活動の可視化2007

    • Author(s)
      越久仁敬,木村直史,増宮晴子,岡田泰昌
    • Organizer
      第30回日本神経科学大会
    • Place of Presentation
      横浜
    • Related Report
      2008 Final Research Report
  • [Presentation] Dynamic voltage-imaging analysis of the effects of acidosis on the respiratory neuronal network in the rat ventral medulla2007

    • Author(s)
      Okada Y, Masumiya H, and Oku Y
    • Organizer
      第47回日本呼吸器学会学術講演会 (English Session)
    • Place of Presentation
      Toyko
    • Related Report
      2008 Final Research Report

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Published: 2007-04-01   Modified: 2016-04-21  

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