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Functional synapse formation in cultured neocortical neurons from prenatal X-irradiated rats.

Research Project

Project/Area Number 11671078
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Embryonic/Neonatal medicine
Research InstitutionInstitute for Developmental Research, Aichi Human Service Center

Principal Investigator

NAKANISHI Keiko  Dept. of Physiology, Senior Researcher, 生理学部, 主任研究員 (50280813)

Project Period (FY) 1999 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsX-irradiation / microcephaly / cultured neuron / synapse formation / GABA / シナプス / 同調活動
Research Abstract

Prenatal X-irradiation can induce microcephaly in the brain of offsprings. To investigate the mechanism how temporary stress in utero induces neurological disorders remaining throughout their life, synapse formation of neocortical neurons from prenatally X-irradiated rats was examined.
Total number of neocortical neurons from prenatally (E16) X-irradiated rats decreased by 16 % relative to control when examined at E17, while the ratio of GABA-positive neurons to MAP2-positive ones increased 2.2 folds of control. Cultured neocortical neurons from normal embryonic rats exhibit synchronized synaptically-driven rhythmic depolarizing potentials (RDPs) after 7-10 DIV. Although RDPs were observed in X-irradiated neurons as well as in control neurons, their amplitude and the number of spikes decreased. These results suggest that inhibitory inputs hold predominance over excitatory inputs in X-irradiated rat's brain, although their neurons have the ability to form synapses. Increased inhibitory inputs might give rise to subsequent neurological disorders of X-irradiated rats.

Report

(5 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Nakanishi K, Asai K, Kato T: "Role of GABA in synapse formation of rat neocortical neurons in culture"Neurosci.Res.Suppl.. 25. S72 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nakanishi K, Fukuda A: "Role of Cl^-transporters in spontaneous synaptic activities in cultured neocortical neurons"Jpn.J.Physiol.Suppl.. 52. S129 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nakanishi K, Fukuda A: "Role of Cl^-transporters in synaptically-driven recurrent depolarizing potentials in cultured neocortical neurons"2002 Abstract Viewer/Itinerary Planner, Washington, DC : Society for Neuroscience. (CD-ROM). 144.18 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nakanishi K, Asai K, Kato T,: "Role of GABA in synapse formation of rat neocortical neurons in culture"Neurosci. Res. Suppl.. 25. S72 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nakanishi K, Fukuda A: "Role of Cl^- transporters in spontaneous synaptic activities in cultured neocortical neurons"Jpn. J. Physiol. Suppl.. 52. S129 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nakanishi K, Fukuda A: "Role of Cl^- transporters in synaptically-driven recurrent depolarizing potentials in cultured neocortical neurons"2002 Abstract Viewer/Itinerary Planner, Washington, DC : Society for Neuroscience. CD-ROM, 144. 18 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nakanishi K, Asai K, Kato T.: "Role of GABA in synapse formation of rat neocortical neurons in culture"Neurosci. Res. Suppl.. 25. S72 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nakanishi K, Fukuda A.: "Role of Cl^-transporters in spontaneous synaptic activities in cultured neocortical neurons"Jpn. J. Physiol. Suppl.. 52. S129 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nakanishi K, Fukuda A.: "Role of Cl^-transporters in synaptically-driven recurrent depolarizing potentials in cultured neocortical neurons"2002 Abstract Viewer/Itinerary Planner, Washington, DC : Society for Neuroscience. (CD-ROM). 144.18 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nakanishi K. et al.: "Recurrent subthreshold electrical activities of rat neocortical neurons progress during long-term culture"Neurosci. Lett.. 304. 85-88 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nakanishi K., Kukita F.: "Furosemide increases the frequency of recurrent subthreshold depolarizations in neocortical neurons in culture"Jpn.J.Physiol.Suppl.. 51. S189 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nakanishi K., et al.: "Recurrent subthreshold electrical activities of rat neocortical neurons in long-term culture"Soc.Neurosci.Abst.. 27. 800.7 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nakanishi K.,Kukita F.: "Intracellular [Cl-] modulates synchronous electrical activity in rat neocortical neurons in culture by way of GABAergic inputs."Brain Res.. 863. 192-204 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Nakanishi K.,Kukita F.: "Effect of intracellular Cl-on spontaneous electrical activity in cultured neocortical neurons."Neurosci.Res.Suppl.. 24. S86 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tokita Y., et al.: "Regulation of neuregulin expression in the injured rat brain and cultured astrocytes."Soc.Neurosci.Abst.. 26. 1603 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Nakanishi K., Kukita F.: "Interacellular [Cl-] modulates synchronous electrical activity in rat neocortical neurons in culture by way of GABAergic inputs"Brain Res.. (in press).

    • Related Report
      1999 Annual Research Report
  • [Publications] Nakanishi K., Kukita F.: "Synchronized electrical activity of neocortical neurons in long-term culture"Neurosci. Res. Suppl.. 23. S162 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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