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Functional role of the ATP receptor-mediated signaling in the solitary network

Research Project

Project/Area Number 09680773
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Neurochemistry/Neuropharmacology
Research InstitutionJikei University School of Medicine

Principal Investigator

KATO Fusao  Jikei University School of Medicine, Faculty of Medicine, Lecturer, 医学部, 講師 (20169519)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsnucleus tractus solitarii / dorsal motor nucleus of vagus / brain slice / patch-clamp / postsynaptic crrent / ligand-gated channel / adenosine 5'-triphosphate / ATP receptor / アテノシン5-シリン酸 / 神経伝達 / パッチ・クランプ / 神経細胞 / アデノシン三リン酸
Research Abstract

It was attempted to clarify the functional role of extracellular ATP-mediated signaling in the central cardiorespiratory network in the solitary complex in which abundant expression of P2X (ATP-gated non-specific cation channels) has been demonstrated histochemically. The whole-cell current was recorded from neurons visually identified with infra-red videomicroscopy in the thick brainstem slice of rats (10-30 days old). The following conclusions were drawn.
1. Involvement of ATP-mediated synaptic transmission in the synapse from solitary tract (TS) to second-order neurons in the nucleus of the solitary tract (NTS) seems to be little. I failed to detect component resistant to CNQX, AP5, bicuculline and strychnine in the TS stimulation-evoked post-synaptic current (PSC). In addition, on contrary to those demonstrated using freshly dissociated NTS cells, no NTS neuron showed inward current with ATP (n=10).
2. However, ATP and its analogues modified PSCs evoked by TS stimulation of the second-order NTS neurons, indicating that P2X receptors are involved in presynaptic regulation of the input gain of afferent information.
3. About 70% of the large diameter (>*30 mum) neurons in dorsal motor nucleus of vagus (dmnX) showed ATP-induced TTX-resistant inward currents together with burst-like PSCs. Bicuculline abolished most of Recording with CsCl in the patch solution indicated that these are mainly GABAergic and partly glutaminergic PSCs. The PSCs activated by ATP was abolished with TTX.This is a novel finding indicating that, in addition to the parasympathetic preganglionic cells, the GABAergic and glutaminergic premotor neurons sending synaptic connections to these cells also express P2X receptors.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Kato, F.: "Adenosine 5′-triphosphate induces P2X purinoceptor- and non-NMDA receptor-mediated inward currents of the solltary complex neurons in rat brainstem sllcs" Soc.Neuroscl. Abstr.24. 630.2 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, F.& Masaki, E.: "Reduction of ATP-Induced currents by sevoflurane of Identifled locus coeruleus neurons in the rat pontine slice" Jap.J.Pharmacol.(印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, F.: "Burst-like postsynaptic inward currents evoked by adenosine 5′-triphosphate of the solitary complex neurons in rat brainstem sllce" Neurosci. Res.22. S253 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Masaki, E., Kato, F., Kondo, I.& Kawamura, M.: "P2X purinergic receptors as a possible site of action of sevoflurane." Anesthesiology. 89. A113 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, F.: "P2X purinoceptor-mediated postsynaptic currents of solitary complex neurons in rat brainstem slices ldentified by intra-red differential Interference contrast videomicroscopy" Jpn.J.Physiol.48. S80 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 加藤総夫: "ニューロサイエンスの新しい研究方法-赤外線顕微鏡下の脳スライス・パッチクランプ法" クリニカル・ニューロサイエンス. 10. 848-849 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, F.: "Adenosine 5'-triphosphate induces P2X purinoceptor-and non-NMDA receptor-mediated inward currents of the solitary complex neurons in rat brainstem slice." Soc.Neurosci.Abstr.24. 630.2 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, F.& Masaki, E.: "Reduction of ATP-induced currents by sevoflurane of identified locus coeruleus neurons in the rat pontine slice." Jan.J.Pharmacol.(in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, F.: "Burst-like postsynaptic inward currents evoked by adenosine 5'-triphosphate of the solitary complex neurons in rat brainstem slice." Neurosci.Res.22. S253 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Masaki, E., Kato, F., Kondo, I.& Kawamura, M.: "P2X purinergic receptors as a possible site of action of sevoflurane." Anesthesiology. 89. A113 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato, F.: "P2X purinoceptor-mediated postsynaptic currents of solitary complex neurons in rat brainstem slices identified by infra-red differential interference contrast videomicroscopy" Jpn.J.Physiol.48(suppl). S80 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kato,F.: "Adenosine 5'-triphosphate induces P2X purinoceptoe-and non-NMDA receptor-mediated inward currents of the solitary complex neurons in rat brainstem slice" Soc.NeuroscL Abstr.24. 630・2 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] kato,F. & Masaki,E.: "Reduction of ATP-Induced currents by sevoflurane of identified locus coeruleus neurons in the rat pontine slice" Jap.J.PharmacoL. 印刷中. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kato,F.: "Burst-like postsynaptic inward currents evoked by adenosine 5'-triphosphate of the solitary complex neurons in rat brainstem slice" Neuroscl.Res.22. S253 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Masaki,E.,Kato,F.Kondo,I. & Kawamura,M.: "P2X purinergic recetors as a possible site of action of sevoflurane." Anesthesilogy. 89. A113 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kato,F.: "P2X purinoceptor-mediated postsynaptic currents of solitary complex neurons in rat brainstem slices identified by Infra-red differential Interference contrast videomicroscopy" Jpn.J.Physiol.48. S80 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 加藤総夫: "ニューロサイエンスの新しい研究方法-赤外線顕微鏡下の脳スライス・パッチクランプ法" クリニカル・ニューロサイエンス. 10. 848-849 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kato,F.: "Pharmacological identification of the postsynaptic potentials of solitary complex neurons in the rat brainstem slice visualized with an infra-red videomicroscopy" Japanese Journal of Pharmacology. (印刷中).

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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