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Functional Expression of L-Type Cardiac Calcium Channels in Mammalian Cell in in vivo and in vitro by Use of Adenovirus.

Research Project

Project/Area Number 09670049
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General physiology
Research InstitutionOITA MEDICAL UNIVERSITY

Principal Investigator

ONO Katsushige  Oita Medical University, Assistant, 医学部, 助手 (40253778)

Co-Investigator(Kenkyū-buntansha) ARITA Makoto  Oita Medical University, Professor, 医学部, 教授 (60037364)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywordscalcium channel / subconductance / alpha subunit / beta subunit / CHW Ccells / dihydropyridine / rabbit
Research Abstract

(1) Formation of single channel subconductance is one of the unique characteristics of the L-type Ca^2^+ channel. The alpha, subunit exhibits a primary function of the channel, it remains uncertain whether alpha subunit alone is able to produce subconductance.
(2) We tested this by studying single channel currents of cloned cardiac alpha subunit expressed in Chinese hamster fibroblast (CHW) cells, with/without coexpression of cardiac beta subunit.
(3) The alpha, subunit exhibited four distinct levels of conductance (22.7, 14.3, 6.2 and 3.2 pS).
(4) Coexpression of beta subunit significantly increased the number of openings in all four levels of conductance without changing the conductance values.
(5) In whole-cell clamp study, both a1 channel and alpha, /beta channel yielded currents that peaked at -10 ms after voltage step. With coexpression of the beta subunit, the maximum peak currents were increased by -5 times and the fractional conductance curve were shifted to the negative potential by -10 mY.
(6) In single channel study, with coexpression of the beta subunit,
(1) The mean available time for channel openings was incresed,
(2) The burst duration was marginally increased,
(3) The mean first latency was shortened,
(4) The mean open time was increased, yielding a second open state,
(5) The mean closed times were unchanged.

Report

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

    (9 results)

All Other

All Publications (9 results)

  • [Publications] K.Ono et al.: "Mechanissm of preservation of myocardial calcium channel function by pyruvate cardioplegic solution." J Lab Clin Med. 131. 136-145 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ono et al.: "Four conductance levels of cloned cardiac L-type Ca^<2+> channel α_1 and α_1/β subunits." FEBS Letters. 423. 86-92 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ono, M.Arita: "Molecular mechanism of beta-adrenergic modulation of cardiac sodium current." Current Topics in Pharmacology. 3. 145-155 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ono, T.Wada, T.S.Lee, N.Gondo, T.Hadama, M.Arita: "Mechanism of preservation of miocardial calcium channel function by pyruvate cardioplegic solution." Journal of Laboratory and Clinical Medicine. 131. 136-145 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Gondo, K.Ono, K.Mannen, A.Yatani, S.A.Green, M.Arita: "Four conductance levels of cloned cardiac L-type Ca^<2+> channel alpha_1 and alpha_1/beta subunits." FEBS Letters. 423. 86-92 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T Wada, K.Ono, T.Hadama, Y Uchida, T.Shimada, M.Arita: "Detectection of Acute Cardiac Rejection by Analysis of Heart Rate Variability in Heterotopically Transplanted Rats." Journal of Heart and Lung Transplantation. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ono et al.: "Mechanissm of preservation of myocardial calcium channel function by pyruvate cardioplegic solution." J Lab Clin Med. 131. 136-145 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Ono et al.: "Four conductance levels of cloned cardiac L-type Ca'^<2+> channel α_1 and α_1/β subunits." FEBS Letters. 423. 86-92 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Ono et al.: "Four conductance levels of cloned cardiac L-type Ca2+ channel a_1and_1/b subunists." FEBS Letters. 印刷中. (1998)

    • Related Report
      1997 Annual Research Report

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

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