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Mechanisms of Regulation of Calcium Channels

Research Project

Project/Area Number 02454118
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field General physiology
Research InstitutionKagoshima University (1991)
Hiroshima University (1990)

Principal Investigator

KAMEYAMA Masaki  Kagoshima Univ., Fac. Med., Professor, 医学部, 教授 (60150059)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1990: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsCa channel / Phosphorylation / Protein kinase / G-protein / Cardiac muscle / Smooth muscle / Cキナ-ゼ
Research Abstract

Mechanisms of regulation of Ca channels in cardiac and smooth muscle cells were investigated with patch-clamp and biochemical methods. Cyclic AMP-dependent protein kinase (PKA), applied to the Ca channels in inside-out patches from guinea-pig ventricular cells, increased the open probability of the channels. Protein kinase C (PKC), however, did not affect the activity of the channel. Similar results were obtained in the Ca channles reconstituted into liposomes, examined with photofluorometry using fura-2. PKA but not PKC phosphorylated a 200KD membrane protein, which was specifically labelled with a photoaffinity Ca-channel ligand azidopine, suggesting that the phosphoprotein was the alpha-1-subunit of the channel. Evidence for a direct activation of the Ca channel by GTP-binding protein was not obtained.
Effects of PKA and PKC were examined in the Ca channel of smooth muscle cells from guinea pig taenia coli. Neither forskolin nor a phorbol ester (TPA) significantly affected the activity of the channels in cell-attached patches. PKA or okadaic acid, applied to the inside-out patches, did not change the activity or time course of rundown of the Ca channels.
The present results support the hypothsis that PKA directly phosphorylates and regulates the cardiac Ca channel. However, direct phosphorylation by PKC of the channel is not supported. The Ca channel in the smooth muscle cells does not seem to be regulated by phosphorylation of the channel protein with PKA or PKC.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Tohse,N.: "Protein kinase C activation enhances the delayed rectifier potassium current in guinea pig heart cells." J.Mol.Cell.Cardiol.22. 725-738 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yazawa,K.: "An improved method for isolating cardiac myocytes useful for patch-clamp studies." Jpn.J.Physiol.40. 157-163 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 亀山 正樹: "Caチャネルとその調節." 代謝 臨時増刊号「シグナル伝達とそのクロスト-ク」. 28. 39-44 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 亀山 正樹: "心筋Caチャネルとその調節" 実験医学 増刊号「イオンチャネルとレセプタ-」. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kameyama,M.: "Role of calpastatin in calcium channel regulation." Pflugers Arch.(Suppl.). (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kameyama,M.(分担執筆): "Recent advances on Ca channels and Ca antagonists." Pergamon Press,New York, 176 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hescheler,J.(分担執筆): "Electrophysiological Methods for In Vitro Studies in Vertebrate Neurobiology." WileyーLiss,New York, (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tohse, N., Kameyama, M., Sekiguchi, K., Shearman, M. S. and Kanno, M.: "Protein kinase C activation enhances the delayed rectifier potassium current in guinea pig heart cells." J. Mol. Cell. Cardiol.22. 725-738 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yazawa, K., Kaibara, M., Ohara, M. and Kameyama, M.: "An improved method for isolating cardiac myocytes useful fo patch-clamp studies." Jpn. J. Physiol.40. 157-163 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kameyama, M.: "Ca channels and their regulation." Taisha. 28, Suppl.39-44 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kameyama, M.: "Properties and Regulation of cardiac Ca channels." Jikken-Igaku. 10, Suppl.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kameyama, M., Kameyama, A., Takano, E., Yazawa, K., Yasui, K. and Murachi, T.: "Role of calpastatin in calcium channel regulation." Pflugers Arch.Suppl.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kameyama, M., Kameyama, A., kaibara, M. and Yazawa, K.: "Mechanisms of rundown of cardiac calcium channels." Recent advances on Ca channels and Ca antagonists.Pergamon Press, New York. 3-10 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hescheler, J. and Kameyama, M.: "Intracellular perfusion of patch electrodes." Electrophysiological Methods for In Vitro Studies in Vertebrate Neurobiology.Wiley-Liss, New York.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 亀山 正樹: "Caチャンネルとその調節" 代謝(臨時増刊号「シグナル伝達路とそのクロスト-ク」). 28. 39-44 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Hanai,H.: "Properties of two calcium transport systems of isolated rat ileal epithelial cells:effects of Ca^<2+> Channel modulators and membrane potential" Pflugers Arch.419. 184-189 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Kameyama,M.,Kameyama,A.kaibara,M.et al.: "Intracellular mechanisms involved “runーdown"of calcium channels." Adv.Exp.Med.Biol. 255. 111-118 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yazawa,K and Kameyama,M: "Mechanism of receptorーmediated regulation of the clelayed outward potassium current in guineaーpig ventricular myocytes." J.Physiol.(Lond). 421. 135-150 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yazawa,K.,Kaibara,M.,Ohara,M.and Kameyama,M.: "An improved method for isolating cardiac myocytes useful for patchーcoamp studies." Jpn.J.Physiol.40. 157-163 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Kameyama,M.,Kameyama.A.,Kaibara,M.& Yazawa,K.(担当執筆): "Recent advances on Ca channels and Ca antagonists." Pergamon Press, (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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