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Coupling of L type calcium channels with ryanodine receptors in presynaptic nerve terminals

Research Project

Project/Area Number 16500265
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Neurophysiology and muscle physiology
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

ISHIBASHI Hitoshi  Kyushu University, Graduate School of Medical Sciences, Assistant Professor, 大学院・医学研究院, 講師 (50311874)

Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2004: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordspresynaptic nerve terminal / depolarization / calcium release / glycine / neuroscience / physiology / カルシウムチャネル / 神経伝達物質 / 細胞内カルシウム / パッチクランプ / リアノジン受容体 / パッチクランプ法 / 機械的単離神経細胞
Research Abstract

The effect of potassium-induced presynaptic depolarization on spontaneous postsynaptic currents under extracellular Ca^<2+>-free conditions was investigated in mechanically dissociated rat spinal cord neurons using whole-cell patch-clamp technique. Spontaneous synaptic currents were fully inhibited by application of strychnine, indicating that they were glycinergic inhibitory postsynaptic currents (IPSCs). Elevating extracellular K^+ concentration reversibly increased that frequency of spontaneous IPSCs even in the absence of extracellular Ca^<2+>. Tetrodotoxin had no effect on the potassium-induced synaptic potentiation. The potassium-induced increase in IPSC frequency was also observed in the absence of extracellular Na^+. However, the recovery from the synaptic potentiation was markedly inhibited in the Na^+-free conditions. The potassium-induced facilitation of spontaneous IPSCs was prevented by depletion of intracellular Ca^<2+> store with thapsigargin, suggesting the contribution of Ca^<2+>-release from intracellular Ca^<2+> stores.
These results reveal a novel mechanism by which potassium-induced depolarization regulates the intracellular Ca^<2+> concentration and exocytosis in presynaptic nerve terminals.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (13 results)

All 2005 2004 Other

All Journal Article (13 results)

  • [Journal Article] Facilitaion of spontaneous glutamate release by antidepressant drugs in rat locus coeruleus2005

    • Author(s)
      Ishibashi et al.
    • Journal Title

      Neuroscience Letters 274

      Pages: 152-156

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Activation of presynaptic GABAA receptors increases spontaneous glutamate release onto noradrenergic neurons of the rat locus coeruleus2005

    • Author(s)
      Koga et al.
    • Journal Title

      Brain Research 1046

      Pages: 24-31

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Loss of mammalian Sprouty2 leads to enteric neuronal hyperplasia and esophageal achalasia2005

    • Author(s)
      Taketomi et al.
    • Journal Title

      Nature Neuroscience 8

      Pages: 855-857

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Facilitation of spontaneous glutamate release by antidepressant drugs in rat locus coeruleus2005

    • Author(s)
      Ishibashi et al.
    • Journal Title

      Neuroscience Letters 274

      Pages: 152-156

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Activation of presynaptic GABAA receptors Increases spontaneous glutamate release onto noradrenergic neurons of the rat locus coeruleus2005

    • Author(s)
      Koga et al.
    • Journal Title

      Brain Research 1046

      Pages: 24-31

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Activation of presynaptic GABAA receptors increases spontaneous glutamate release onto noradrenergic neurons of the rat locus coeruleus2005

    • Author(s)
      Koga H, Ishibashi H, Shimada H, Jang IS, Nakamura TY, Nabekura J
    • Journal Title

      Brain Research 1046

      Pages: 24-31

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Loss of mammalian Sprouty2 leads to enteric neuronal hyperplasia and esophage alachalasia2005

    • Author(s)
      Taketomi T., 他12名
    • Journal Title

      Nature Neuroscience 8

      Pages: 855-857

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Facilitation of spontaneous glutamate release by antidepressant drugs in rat locus coeruleus2005

    • Author(s)
      Ishibashi H, Eto K, Kajiwara M, Noda M.
    • Journal Title

      Neuroscience Letters 374

      Pages: 152-156

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Noradrenaline-induced cation currents in isolated paratracheal ganglion neurons2004

    • Author(s)
      Umezu et al.
    • Journal Title

      Brain Research 1023

      Pages: 74-82

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Noradrenaline-induced cation currents in isolated rat paratracheal ganglion neurons2004

    • Author(s)
      Umezu M, Ishibashi H, Umebayashi C, Akaike N, Ito Y
    • Journal Title

      Brain Research 1023

      Pages: 74-82

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Inhibition of the serotonin-induced inward crrent by dextromethorphan in rat nodose ganglion neurons

    • Author(s)
      Ishibashi et al.
    • Journal Title

      Brain Research (出版予定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Inhibition of the serotonin-induced inward current by dextromethorphan in rat nodose ganglion neurons

    • Author(s)
      Ishibashi et al.
    • Journal Title

      Brain Research (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Potentiation of the NMDA receptor-mediated responses through the glycine site by microglia secreting soluble factors.

    • Author(s)
      Hayashi Y, Ishibashi H, Hashimoto K, Nakanishi H
    • Journal Title

      Glia (掲載決定)

    • Related Report
      2005 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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