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Effect of hypoxia on Na^+/Ca^<2+> exchange in isolated cardiac myocyte and its regulatory mechanism

Research Project

Project/Area Number 04670557
Research Category

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

Allocation TypeSingle-year Grants
Research Field Circulatory organs internal medicine
Research InstitutionJikei University School of Medicine

Principal Investigator

MOCHIZUKI Seibu  Jikei University School of Medicine, Department of Internal Medicine, Professor, 医学部, 教授 (20130205)

Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥900,000 (Direct Cost: ¥900,000)
KeywordsNa^+ / Ca^<2+> exchange / forward mode / reverse mode / hypoxia / myocyte / acidosis / Ca^<2+> / Fura 2 / 虚血 / Fura2 / Na / H交換系 / Fura‐2 AM / SBFI / H^+交換系 / Ca^2^+交換系 / 低酸素
Research Abstract

Complex changes in ionic movement through the sarcolemma occur after ischemia or hypoxia, and may be restored or aggravated after reperfusion or reoxygenation. Earliest changes are increases in [Ca^<2+>]_i, H_i^+ and [Na^+]_i, However, the interactions between these ions are not fully understood. In this study, the effect of ischemia or hypoxia on intracellular and extracellular ionic changes particularly Na^+/Ca^<2+> exchange was investigated in both isolated cardiac myocytes and isolated perfused rat hearts.[Ca^<2+>]_i, pH_i and [Na^+]_i were measured using fluorescence indicators, Fura-2, BCECF and SBFI,respectively. We have measured increases in the [Ca^<2+>]_i of isolated cardiac myocytes during Na^+-free (Na^+ substituted by TMA^+) exposures using Fura-2 in normoxic and hypoxic solutions and when varing pH_i and pH_0. Hypoxia was produced either by (1) bubbling solution with N_2 or (2) bubbling with N_2 and adding 2-deoxy-D-glucose. After 5 min of hypoxia, the rate of increase in … More [Ca^<2+>]_i during exposure to Na^+-free solutions decreased significantly when compared with that observed in aerobic condition. When pH_i is acidified by adding and removing NH_4Cl, similar inhibitory effects to those observed during hypoxia are produced.
When the isolated hearts were perfused with aerobic and ischemic conditions, [Ca^<2+>]_i increases in a biphasic pattern while pH_i decreases rapidly from 7.2 to 6.8 at 3 min add 6.6 at 10 min after hypoxia starts. [Na^+]_i increases gradually during hypoxia. Both the forward and reverse modes of the Na^+/Ca^<2+> exchanger were markedly inhibited during hypoxia and recovered slowly on reoxygenation. The forward mode of Na/Ca exchange was estimated by transient increase in [Ca^<2+>]_i followed by the decay in [Ca^<2+>]_i induced by addition of caffeine. Na^+ channel blocker partially prevented an increase in [Ca^<2+>]_i during hypoxia. These data collectively indicate the complex spectrum of ionic changes, particularly Na^+/Ca^<2+> exchanger that occur during both ischemia/hypoxia and reperfusion/reoxgenation. These results suggested that the Na^+/Ca^<2+> exchange systems, both forward and reverse mode, were inhibited during hypoxia/ischemia. However, an increase in [Ca^<2+>]_i is likely due to the inhibition of forward mode of Na^+/Ca^<2+> exchange since this exchanger normally represents the major efflux pathway for Ca^<2+> in the heart.pH_i changes during hypoxia have also strong modulatory influence on Na^+/Ca^<2+> exchange. Less

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (46 results)

All Other

All Publications (46 results)

  • [Publications] Mochizuki S., et al: "Ischemia-reperfusion arrhythmias and lipids:Effect of human high- and low-density lipoproteins on reperfusion arrhythmias." Cardiovascular Drugs & Therapy. 5. 269-267 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Jiang, C., Poole-Wilson, P. A., Mochizuki, S., et al: "Effect of 17β-oestradiol concentration. Ca^<2+> current and intracellular free Ca^<2+> in guinea-pig isolated cardiac myocytes." British Journal of Pharmacology. 106. 739-745 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki, S., et al: "The effect of hypoxia on cytoplasmic Ca^<++> during low Na^+ exposure in isolated cardiac myocytes from guinea pig." Journal of Physiology London. 446. 334- (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki, S., et al: "Na^+/H^+ exchanger and reperfusion-induced ventricular arrhythmias in isolated perfused heart:Possible role of amiloride." Molecular and Cellular Biochemistry. 119. 151-157 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S, et al: "Attenuation of susceptibility to ischemia/reperfusion in isolated, substrate-free perfused heart from diabetic rats." The Adapted Heart.ed by Nagano M, Takeda N, Dhalla S Raven Press N. Y.423-429 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Jiang C, Mochizuki S, et al: "Effect of lemakalim on action potentials, intracellular calcium, and contraction in guinea pig and human cardiac myocytes." Cardiovascular Research. 28. 851-857 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nagano M, Mochizuki S, Dhalla, N. S.: "Cardiovascular Disease in Diabetes." Kluwer Academic Publishers, 388 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Yazaki Y, Mochizuki, S, edited: "Biochemical and Molecular Mechanisms in Cell Function." Kluwer Academic Publishers, 220 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S,et al.: "Ischemia-reperfusion arrhythmias and lipids : Effect of human high- and low-density lipoproteins on reperfusion arrhythmias." Cardiovascular Drugs & Therapy. 5. 269-276 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S, et al.: "Regulation of substrate utilization and ventricular function in diabetic heart." The Diabetic Heart Raven Press N.Y.351-364 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Murase T.Mochizuki S,et al.: "Lipoprotein Lipase activity in isolated perfused heart of streptozptocin induced diabetic rats." The Diabetic Heart Raven Press N.Y.409-413 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Jiang C,Mochizuki S,et al.: "17 beta oestradiol inhibits calcium currents in isolated single guinea pig cardiac myocytes." British Heart J.66. 96-97 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Jiang C,Poole-Wilson P.A,Mochizuki S,et al.: "Effect of 17 beta-oestradiol concentration. Ca^<2+> current and intracellular" British Journal of Pharmacology. 106. 739-745 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S,Nagano M.MacLeod K.T.: "Ionic regulation during hypoxia and metabolic inhibition studied by fluorescent indicates." J.Mol.Cell.Cardiol.24 (Supple 1). S15 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S,et al.: "The effect of hypoxia on cytoplasmic Ca^<++> during low Na+ exposure in isolated cardiac myocytes from guinea pig." Journal of Physiology London. 446. 334 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Jiang C,Mochizuki S.et al.: "Lemakalim attenuates action potential duration and intracellular Ca^<2+> in guinea pig and human ventricular myocytes." J.Mol.Cell.Cardiol.24. S271 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] MacLeod K.T,Mochizuki S.et al.: "Effects of hypoxia and pH on cytoplasmic Ca^<2+> during Na^+-free exposure in isolated cardiac myocytes from guinea pog." Biophy.J.61. A444 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S,et al.: "Na^+/H^+ exchanger and reperfusion-induced ventricular arrhythmias in isolated perfused heart : Possible role of amiloride." Molecular and Cellular Biochemistry. 119. 151-157 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S,et al.: "Attenuation of susceptibility to ischemia/reperfusion in isolated, substrate-free perfused heart from diabetic rats." The Adapted Heart.ed by Nagano M,Takeda N,Dhalla S Raven Press N.Y.(1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Jiang C,Mochizuki S,et al.: "Effect of lemakalim on action potentials, intracellular calcium, and contraction in guinea pig and human cardiac myocytes." Cardiovascular Research. 28. 851-857 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nagano M,Mochizuki S,Dhalla, N.s.: Cardiovascular Disease in Diabetes.Kluwer Academic, (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Yazaki Y,Mochizuki S,edited.: Molecular Mechanisms in Cell Function.Kluwer Academic Biochemical and Publishers, (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Mochizuki S.,et al: "Ischemia-reperfusion injury and lipids:Effect of human high-and low-density lipoproteins on reperfusion arrhythmias." Cardiovascular Drugs & Therapy. 5. 269-276 (1991)

    • Related Report
      1994 Annual Research Report
  • [Publications] Jiang,C.,Poole-Wilson,P.A.,Mochizuki,S.,et al: "Effect of 17 β-oestradiol concentration.Ca^<2+> current and intracellular free Ca^<2+> in guinea-pig isolated cardiac myocytes." British Journal of Pharmacology. 106. 739-745 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] Mochizuki,S.,et al: "The effect of hypoxia on cytoplasmic Ca^<++> during low Na^+ exposure in isolated cardiac myocytes from guinea pig." Journal of Physiology London. 446. 334 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] Mochizuki,S.,et al: "Na^+/H^+ exchanger and reperfusion-induced ventricular arrhythmias in isolated perfused heart:Possible role of amiloride." Molecular and Cellular Biochemistry. 119. 151-157 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Mochizuki S,et al: "Attenuation of susceptibility to ischemia/reperfusion in isolated,substrate-free perfused heart from diabetic rats." The Adapted Heart.ed by Nagano M,Takeda N,Dhalla S Raven Press N.Y.423-429 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Jiang C,Mochizuki S,et al: "Effect of lemakalim on action potentials,intracellular calcium,and contraction in guinea pig and numan cardiac myocytes." Cardiovascular Research. 28. 851-857 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Nagano M,Mochizuki S,Dhalla N.S.: "Cardiovascular Disease in Diabetes." Kluwer Academic Publishers, 388 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yazaki Y,Mochizuki,S,edited: "Biochemical and Molecular Mechanisms in Cell Function." Kluwer Academic Publishers, 220 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Mochizuki,S.et al.: "Regulation of substrate utilization and ventricular function in diabetic heart." The Diabetic Heart. 351-364 (1991)

    • Related Report
      1993 Annual Research Report
  • [Publications] Mochizuki,S.et al.: "Ischemia‐reperfusion arrhythmias and lipids:Effect of human high‐and low‐density lipoproteins on reperfusion arrythmias." Cardiovascular Drugs and Therapy. 5. 269-276 (1991)

    • Related Report
      1993 Annual Research Report
  • [Publications] Murase,T.,Mochizuki,S.et al.: "Lipoprotein lipase activity in isolated perfused hearts of streptozocin‐induced diabetic rat." The Diabetic Heart. 409-413 (1991)

    • Related Report
      1993 Annual Research Report
  • [Publications] Mochizuki,S.et al.: "Protective effect of probucol on ischemia‐reperfusion arrhythmias in the rat heart" Canadian Journal of Cardiology. 8. 1-5 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] Jiang,C.,Mochizuki,S.et al: "Effect of 17beta‐oestradiol on contraction,Ca^<2+> current and intracellular free Ca^<2+> in guinea‐pig isolated cardiac myocytes." Br.J.Pharmacol.106. 739-745 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] Mochizuki,S.et al.: "Na^+/H^+ exchanger and reperfusion‐induced ventricular arrhythmias in isolated perfused heart.Possible role of amiloride" Molecular and Cellular Biochemistry. 119. 151-157 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Nagano M.,Mochizuki,S.,Dhalla N.S.: "Cardiovascular Diabetes in Diabetes" Kluwer Academic Publishers, 388 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] Yazaki,Y.and Mochizuki,S.: "Cellular Function and Metabolism" Kluwer Academic Publishers, 220 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Mochizuki,S.,Nagano,M.,MacLeod,K.T.: "Ionic regulation during hypoxia and metabolic inhibition by fluorescent indicators." Journal of Molecular and Cellular Cardiology. 24(Sl). 15 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Mochizuki,S.,Macleod,K.T.: "The effect of hypoxia on cytoplasmic Ca^<++> during low Na^+ exposure in isolated cardiac myocytes from guinea pig." Journal of Physiology London. 446. 334 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 望月 正武,永野 允: "カルシウム動態と疫患:心筋虚血.低酸素時のNa^+/Ca^<2+>交換機構" Mebio. 3. 74-78 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Tada,N.,Mochizuki,S.,et al.: "Protective effect of probucol on ischemia-reperfusion arrhythmias in the rat heart." Canadian Journal of Cardiology. 8. 975-980 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Mochizuki,S.,et al.: "Na^+/H^+ exchanger and reperfusion-induced ventricular arrhythmias in isolated heart: Possible role of amiloride" Molecular Cellular Biochemistry. 119. 151-157 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Jiang,C.,Poole-Wilson,P.A.,Mochizuki,S., et al.: "Effect of 17t-oestradiol concentration,Ca^<2+> current and intracellular free Ca^<2+> in guinea-pig isolated cardiac myocytes." British Journal of Pharmacology. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Nagano, M., Mochizuki, S., Dhalla, N.S.: "Cardiovascular Diseade in Diabetes Mellitus" Kluwer Acadimic Publishers, 388 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Yazaki, Y., Mochizuki, S.: "Cellular Function and Metabolism" Kluwer Academic Publishers, 220 (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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