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Analysis of functional role of capacitative Ca entry in enteric neurons

Research Project

Project/Area Number 13660292
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Basic veterinary science/Basic zootechnical science
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

OHTA Toshio  Hokkaido Univ. Grad. School of Vet. Med., Asso. Prof., 大学院・獣医学研究科, 助教授 (20176895)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsCalcium / enteric neurons / adrenal chromaffin cells / transient receptor potential protein / ion channel / intracellular calcium / タプシガルジン / 細胞内ストア / クロム親和性細胞 / PC12細胞 / オピオイドペプチド / 電位依存性Caチャネル / ミトコンドリア / TRP
Research Abstract

The main aim of this project was to clarify the regulatory role of capacitative Ca entry mechanisms in enteric neurons. For this purpose the properties of Ca influx pathways and their regulation were examined using chromaffin and PC12 cells as neural models, and cultured enteric neurons. 1) Voltage-dependent Ca channels in chromaffin cells were received an inhibitory control through G-proteins by endogenous opioids. 2) Ca release from the intracellular stores regulated the activity of membrane ionic channels as well as secretory responses. 3) ATP evoked [Ca^<2+>]I increase in enteric neural cells with anti-PGP 9.5-immunoreactivity. After intracellular stored Ca was depleted with ATP and thapsigargin, a sustained [Ca^<2+>]I was produced, which was suppressed by the treatment with SK&F96365, Ni^<2+> and La^<3+>, indicating that the presence of capacitative Ca entry in enteric neuronal cells. 5) RT-PCR revealed that several TRP-proteins, being considered as Ca entry pathways, were expressed in rat brain and enteric neurons. 5) In TRP5-transfected PC12 cells, [Ca^<2+>]I increases induced by stimulation of G-protein coupled receptors such as bradykinin and UTP were significantly larger than those in mock-cells. These results indicate that Ca entry pathways in neural cells were regulated under various mechanisms, and capacitive Ca entry mechanisms play a role as Ca influx pathway stimulated by the neurotransmitters in enteric neurons. Further research is necessarily to elucidate the molecular basis of the channels protein and intracellular regulatory mechanism on capacitative Ca entry in enteric neural cells.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Ohta T.: "Ca2+-dependent K+ current and exocytosis in responses to caffeine and muscarine in voltage-clamped guinea-pig adrenal chromaffin cells"Journal of Neurochemistry. 78. 1-14 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ohta T.: "Functional relation between caffeine-and muscarine-sensitive Ca2+stores and no Ca2+ releasing action of cyclic adenosine diphosphate-ribose in guinea-pig adrenal chromaffin cells"Neuroscience Letters. 326. 167-170 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kitamura G.: "Inhibitory effects of opioids on voltage-dependent Ca2+ channels and catecholamine secretion in cultured porcine adrenal chromaffin cells"Brain Research. 942. 11-22 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ohta T: "Relaxant mechanisms of parathyroid hormone in rat mesenteric artery"J Cardiovasc Pharmacol. 40. 554-563 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yonekubo K.: "Inhibitory effects of cortical steroids and adrenocorticotropic hormone oncatecholamine secretion in perfused guinea-pig adrenal glands"Autonomic & Autacoid Pharmacology. 22. 93-101 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yonekubo K. et al.: "Two distinct inhibitory actions of steroids on cholinoceptor-mediated secretion of catecholamine from guinea-pig adrenal medullary cells"Neuroscience Letters. 337(2). 89-92 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ohta T. et al.: "Relaxant mechanisms of parathyroid hormone in rat mesenteric artery"J Cardiovasc Pharmacol.. 40(4). 554-563 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yonekubo K. et al.: "Inhibitory effects of cortical steroids and adrenocorticotropic hormone on catecholamine secretion in guinea-pig perfused adrenal glands"Auton Autacoid Pharmacol.. 22(2). 93-101 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ohta T. et al.: "Functional relation between caffeine-and muscarine-sensitive Ca2+stores and no Ca2+ releasing action of cyclic adenosine diphosphate-ribose in guinea-pig adrenal chromaffin cells"Neuroscience Letters. 326. 167-170 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kitamura G. et al.: "Inhibitory effects of opioids on voltage-dependent Ca2+ channels and catecholamine secretion in cultured porcine adrenal chromaffin cells"Brain Research. 942. 11-22 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ohta T. et al.: "Ca2+-dependent K+ current and exocytosis in responses to caffeine and muscarine in voltage-clamped guinea-pig adrenal chromaffin cells"Journal of Neurochemistry. 78. 1-14 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ito S. et al.: "Heterogeneiety of neruronal nicotinic acetylchooine receptors in 5-HT-containing chemoreceptor cells of the chicken aorta"Br. J. Pharmacol. 132. 1934-1940 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kasai Y. et al.: "Release of dopamine and ATP from PC12 cells treated with dexamethasone, reserpine and bafilomycin A1"J. Vet. Med. Sci.. 63(4). 367-372 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yonekubo K.: "Inhibitory effects of cortical steroids and adrenocorticotropic hormone oncatecholamine secretion n perfused guinea-pig adrenal glands"Autonomic & Autacoid Pharmacology. 22. 93-101 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ohta T.: "Functional relation between caffeine-and muscarine-sensitive Ca2+stores and no Ca2+ releasing action of cyclic adenosine diphosphate-ribose in guinea-pig adrenal chromaffin cells"Neuroscience Letters. 326. 167-170 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kitamura G.: "Inhibitory effects of opioids on voltage-dependent Ca2+ channels and catecholamine secretion in cultured porcine adrenal chromaffin cells"Brain Research. 942. 11-22 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ohta T: "Relaxant mechanisms of parathyroid hormone in rat mesenteric artery"J Cardiovasc Pharmacol. 40. 554-563 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Toshio Ohta: "Ca2+-dependent K+ current and exocytosis in responses to caffeine and muscarine in voltage-clamped guinea-pig adrenal chromaffin cells"Journal of Neurochemistry. 78. 1-14 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Shigeo Ito: "Heterogeneiety of neruronal nicotinic acetylchooine receptors in 5-HT-containing chemoreceptor cells of the chicken aorta"British Journal of Pharmacology. 132. 1934-1940 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yohei Kasai: "Release of dopamine and ATP from PC12 cells treated with dexamethasone, reserpine and bafilomycin A1"Joural of Veterinary Medical Science. 63. 367-372 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hiroki Teraoka: "Ca2+ signaling in porcine duodenal glands by muscarinic receptor activation"American Journal of Physiology. 280. G729-G737 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Go Kitamura: "Inhibitory effects of opioids on voltage-dependent Ca^<2+> channels and catecholamine secretion in cultured porcine adrenal chromaffin cells"Brain Research. (in press). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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