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Analyses of the physiological functions of voltage-dependent ion channels in sensory organs and their expressions in the process of regeneration and differentiation in sensory organs.

Research Project

Project/Area Number 17500217
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Neuroscience in general
Research InstitutionFUJITA HEALTH UNIVERSITY

Principal Investigator

MIYACHI Eiichi  FUJITA HEALTH UNIVERSITY, School of Medicine, Professor, 医学部, 教授 (90129685)

Co-Investigator(Kenkyū-buntansha) KAWAI Fusao  FUJITA HEALTH UNIVERSITY, School of Medicine, Associate Professor, 医学部, 助教授 (20300725)
OHKUMA Mahito  FUJITA HEALTH UNIVERSITY, School of Medicine, Assistant Professor, 医学部, 講師 (50329710)
IMADA Hideki  FUJITA HEALTH UNIVERSITY, School of Medicine, Research Associate, 医学部, 助手 (70387710)
WATANABE Masami  FUJITA HEALTH UNIVERSITY, School of Medicine, Visiting Assistant Professor, 医学部, 客員講師 (10093486)
松崎 かおり  藤田保健衛生大学, 医学部, 助手 (80387703)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2006: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2005: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsSensory organ / retinal bipolar cell / retinal ganglion cell / patch-clamp technique / voltage-dependent Na+ channel / optic nerve axotomy / regeneration / acetycholine / ヒスタミン
Research Abstract

(1) The whole-cell patch-clamp recording was performed at inner nuclear layer in the fragments of the human retina. Under voltage-clamp conditions, depolarizing voltage steps induced a fast transient inward current in several bipolar cells. This current was activated from-60 mV to +10 mV (maximal at-20 mV) and inactivated within 5 ms. And the current was blocked by TTX. These results suggest that human retinal bipolar cells express voltage-gated Na+ channels. The hyperpolarization-activated cation current (h current) was not observed in human retinal bipolar cells (n = 0/16), while h currents were observed in human photoreceptors. Next, we performed a single-cell RT-PCR analysis to test whether bipolar cells express the Na+ channel transcript. Nav1.2 channels identified from retinal mRNA were observed in 5 of 6 bipolar cells. This suggests that human bipolar cells express Nav1.2 channels as well as human photoreceptors.
(2) Acetylcholine receptors are known to be expressed in developmental and regenerative process of retinal ganglion cells in newts and other species. We performed Fura-2 based calcium imaging of retinal ganglion cells in adult cats to examine, whether acetylcholine responses were detected in retinal ganglion cells at various degenerating or regenerating stages after axotomy. Calcium imaging of retinal ganglion cells showed that bath application of 100 μM carbachol, an acetylcholine receptor agonist, rose intracellular calcium concentration in 22% of ganglion cells in the intact retina. Three days after axotomy, 85% of examined ganglion cells responded to carbachol. However, no ganglion cells responded to carbachol 7-15 days after axotomy. Responsiveness to acetylcholine recovered in axonal regenerated surviving ganglion cells (17%). These results suggest that acetylcholine may have neurotrophic effect on surviving ganglion cells, and that acetylcholine may be a key marker for neuronal degeneration /regeneration in cat retinal ganglion cells.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (18 results)

All 2007 2006 2005

All Journal Article (18 results)

  • [Journal Article] カルシウムイメージング法で解析した嗅細胞におけるヒスタミン応答2007

    • Author(s)
      三村 英也
    • Journal Title

      日本鼻科学会会誌 45巻・4号

      Pages: 361-366

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Patch-clamp recording of human retinal photoreceptors and bipolar cells.2007

    • Author(s)
      Mahito Ohkuma
    • Journal Title

      Photochemistry and Photobiology (In Press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] 嗅覚受容細胞における活動電位生成機構2007

    • Author(s)
      河合 房夫
    • Journal Title

      生体の科学 (In Press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Patch-clamp recording of human retinal photoreceptors and bipolar cells.2007

    • Author(s)
      Mahito OHKUMA
    • Journal Title

      Photochemistry and Photobiology (In Press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Mechanism underlying the generation of action potentials in olfactory receptor cells.2007

    • Author(s)
      Fusao KAWAI
    • Journal Title

      SEITAI NO KAGAKU (In Press)

    • NAID

      40015608303

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Protective effect against 17β-estradiol on neuronal apoptosis in hippocampus tissue following transient ischemia/recirculation in Mongolian gerbils via down-regulation of tissue transglutaminase activity.2006

    • Author(s)
      Kimikazu Fujita
    • Journal Title

      Neurochemical Research 31・8

      Pages: 1059-1068

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 自律神経系に及ぼすコーヒーの香りの効果の生理工学的研究.2006

    • Author(s)
      河合 房夫
    • Journal Title

      Aroma Research 7巻・2号

      Pages: 164-167

    • NAID

      40007334478

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Protective effect against 176-estradiol on neuronal apoptosis in hippocampus tissue following transient ischemia/recirculation in Mongolian gerbils via down-regulation of tissue transglutaminase activity.2006

    • Author(s)
      Kimikazu FUJITA
    • Journal Title

      Neurochemical Research 31(8)

      Pages: 1059-1068

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Physiological engineering study on effects of the scent of coffee on the autonomic nervous system.2006

    • Author(s)
      Fusao KAWAI
    • Journal Title

      Aroma Research 7(2)

      Pages: 164-167

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Histamine responses in olfactory receptor cells assessed using a calcium imaging technique2006

    • Author(s)
      Hideya MIMURA
    • Journal Title

      Japanese Journal of Rhinology 45(4)

      Pages: 361-366

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Protective effect against 17β-estradiol on neuronal apoptosis in hippocampus tissue following transient ischemia/ recirculation in Mongolian gerbils via down-regulation of tissue transglutaminase activity.2006

    • Author(s)
      Kimikazu Fujita
    • Journal Title

      Neurochemical Research 31巻・8号

      Pages: 1059-1068

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Acetylcholine enhances odorant sensitivity in newt olfactory receptor cells.2006

    • Author(s)
      Mahito Ohkuma
    • Journal Title

      Journal of Physiological Sciences 56・Suppl

    • NAID

      130005448492

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Eye movements of flatfish evoked by body tilting.2006

    • Author(s)
      Kaori Iwata
    • Journal Title

      Journal of Physiological Sciences 56・Suppl

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Linalool suppresses voltage-gated currents in sensory neurons and cerebellar Purkinje cells.2005

    • Author(s)
      Fusao Kawai
    • Journal Title

      Journal of Neural Transmission 112・2

      Pages: 193-203

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Linalool suppresses voltagegated currents in sensory neurons and cerebellar Purkinje cells.2005

    • Author(s)
      Fusao KAWAI
    • Journal Title

      Journal of Neural Transmission 112(2)

      Pages: 193-203

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Requirement of tumor suppressor protein APC for glutamatergic synapse development.2005

    • Author(s)
      Atsushi Shimomura
    • Journal Title

      Neuroscience Research 52・Suppl.

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Acetylcholine modulates odorant sensitivity in newt olfactory receptor cells.2005

    • Author(s)
      Mahito Ohkuma
    • Journal Title

      Neuroscience Research 52・Suppl.

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 17-βestradiol regulate expression of glutamate transporters after transient ischemic insult in gerbil hippocampus.2005

    • Author(s)
      Toshiaki Kato
    • Journal Title

      Bulletin of the Japanese Society for Neurochemistry 44・2,3

      Pages: 202-202

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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