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Mechanism of calcium overload during myocardial ischemial and reperfusion -study using fluorescent probes-

Research Project

Project/Area Number 03670446
Research Category

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

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

Principal Investigator

HAYASHI Hideharu  Hamamatsu University School of Medicine Photon Medical Research Center Associate Professor, 光量子医学研究センター, 助教授 (50135258)

Co-Investigator(Kenkyū-buntansha) TERADA Hajime  Hamamatsu University School of Medicine Department of Medicine Assistant, 医学部, 助手 (50252177)
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywords[Na^+]i / [Ca^<2+>]i / SBFI / fluo-3 / strophanthidin / metabolic inhibition / Na^+ / H^+ exchange / Ca^<2+> exchange / 蛍光色素 / Na^+-H^+交換 / Na^+-Ca^<2+>交換 / 細胞内Na^十濃度([Na^十]i) / 細胞内Ca^<2十>濃度([Ca^<2十>]i) / 蛍光色素法 / 細胞障害 / 虚血・再潅流 / 細胞内pH(pHi) / カルシウム過負荷 / Furaー2 / BCECF
Research Abstract

We monitored [Na^+]i and [Ca^<2+>]i simultaneously using SBFI/AM and fluo-3/AM in guinea pig ventricular myocytes. After the addition of 500 muM strophanthidin, [Na^+]i increased from 7.9(〕SY.+-.〔)0.4 mM (mean(〕SY.+-.〔)SE) to 19.6(〕SY.+-.〔)1.8 mM at 40 min. [Ca^<2+>]i was low during the first 20 min, and then began to increase to 361(〕SY.+-.〔)69 % of the control at 40 min. The addition of hexamethylene amiloride (HMA : 1muM) prevented the increases in both [Na^+]i and [Ca^<2+>]i. Ryanodine (1muM) suppressed the increase in [Ca^<2+>]i. These findings indicated that (1) the pathway of Na^+ entry was mainly through Na^+/H^+ exchange, and that the elevated [Na^+]i induced Ca^<2+> entry mediated by the Na+/Ca^<2+> exchange, (2) the entered Ca^<2+> triggered the Ca^<2+> release from the sarcoplasmic reticulum. For metabolic inhibition (MI), the perfusate contained 3.3 mM amytal and 5 muM CCCP.During the first 20 min of MI, [Na^+]i increased from 6.2(〕SY.+-.〔)0.5 mM to 18.6(〕SY.+-.〔)1.6 mM (p<0.01, m=31), whereas [Ca^<2+>]i remained at the low level. In the following 30 min, 29 of 31 (94 %) myocytes developed contracture, and [Ca^<2+>]i began to increase after cells had contracted until it reached to 167(〕SY.+-.〔)14 % of the control (p<0.01). The levels of [Ca^<2+>]i when cells contracted or hypercontracted during MI were much lower than those during 500 muM strophanthidin perfusion, whereas [Na^+]i increased further. It was shown that there was a dissociation in the relationship between [Na^+]i and [Ca^<2+>]i during MI.The increase in [Na^+]i during MI was suppressed by 1 muM HMA or 10 mM glucose. The addition of 10 mM glucose after 20 min of MI led to a dramatic increase in [Ca^<2+>]i to 442(〕SY.+-.〔)72 % of the control (50 min. n=31, p<0.01). The increase in [Ca^<2+>]i and cell contracture after energy repletion were suppres

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] Hiroshi Satoh: "Quantification of intracellular free sodium ions by using a new fluorescent indicator,sodium-binding benzofuran isophthalate in guinea pig myocytes" Biochemical and Biophysical Research Communications. 175. 611-616 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hideharu Hayashi: "Intracellular Ca^<2+> concentration and pHi during metabolic inhibition" American Journal of Physiology(Cell Physiology). 262. C628-C634 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Naohisa Noda: "Cytosolic Ca^<2+> concentration and pH of diabetic rat myocytes during metabolic inhibition" Journal of Molecular and Cellular Cardiology. 24. 435-446 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 林秀晴: "心筋内カルシウムイオン移動の視覚化" 病態生理. 11. 261-265 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hideharu Hayashi: "Simultaneous measurement of intracellular Na^+ and Ca^<2+> during K^+-free perfusion in isolated myocytes" American Journal of Physiology(Cell Physiology). 266(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hiroshi Satoh: "Regulation of [Na^+]i and [Ca^<2+>]i inguinea pig myocytes:dual loading of fluorescent indicators SBFI and fluo3." American Journal of Physiology(Heart Circ.Physiology).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 林秀晴: "Medical Topics Series 不整脈'91「再潅流不整脈」" メディカルレビュー社, 10 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Satoh H, Hayashi H, Noda N, Terada H, Kobayashi A, Yamashita Y, Kawai T, Hirano M, Yamazaki N.: "Quantification of intracellular free sodium ions by using a new fluorescent indicator, sodium-binding benzofuran isophthalate (SBFI) in guinea pig myocytes." Biochem.Biophys.Res.Commun.175. 611-616 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hayashi H, Miyata H, Noda N, Kobayashi A, Hirano M, Kawai T, Yamazaki N.: "Intracellular Ca^<2+> concentration and pHi during metabolic inhibition." Am.J.Physiol.262 (Cell Physiol.31). 628-634 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Noda N, Hayashi H, Miyata H, Suzuki S, Kobayashi A, Yamazaki N.: "Cytosolic Ca^<2+> concentration and pH of diabetic rat myocytes during metabolic inhibition." J.Mol.Cell.Cardiol.24. 435-446 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hayashi H, Yamazaki N.: "Visualization of the movement of intracellular Ca^<2+> in myocytes." Pathophysiology. 11 (in Japanese). 261-265 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hayashi H, Satoh H, Noda N, Terada H, Hirano M, Yamashita Y, Kobayashi A, Yamazaki N.: "Simultaneous measurement of intracellular Na^+ and Ca^<2+> during K^+-free perfusion in isolated myocytes." Am.J.Physiol.266 (Cell Physiol.) : (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Satoh H, Hayashi H, Terada H, Kobayashi A, Hirano M, Yamashita Y, Yamazaki N.: "Regulation of [Na^+]i and [Ca^<2+>]i in guinea pig myocytes -study by dual-loading of fluorescent indicators SBFI and fluo 3." Am.J.Physiol.266 (Heart Circ.Physiol) : (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hayashi H, Yamazaki N.: ""Reperfusion Arrhythmia"." Medical Topics Series.Arrhythmia '91. (in Japanese). 154-163 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hideharu Hayashi 他: "Effects of phospholipase C on action potentials and intracellular Ca^<2+> concentration in guinea pig heart." Japanese Circalation Journal. 57. 344-352 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Naohisa Noda,Hideharu Hayashi 他: "Ca^<2+> transients and cell shortening in diabetic rat ventricular myocytes." Japanese Circulation Journal. 57. 449-457 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 林秀晴 他: "糖尿病心臓のカルシウム代謝" Diabetes Frontier. 4. 694-698 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Hideharu Hayashi 他: "Simultaneous measurement of intracellular Na^+ and Ca^<2+> during K^+-free perfusion in isolated myocytes." American Journal of Physiology(Cell Physiology). 266(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Hiroshi Satoh Hideharu Hayashi 他: "Regulation of [Na^+] and [Ca^<2+>]i in guinea pig myocytes:dual loading of fluoresent indicators SBFI and fluo 3." American Journal of Physiology(Heart Circ.Physiology). 266(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Hideharu Hayashi 他: "Fluorescence imaging of intracellular Ca^<2+>" J.Pharacol.Toxicol.Metrods. 31(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Hideharu Hayashi 他: "Intracellular Ca^<2十>concentration and pHi during metabolic inhibition" American Journal of Physiology(Cell physiol.). 262. C628-C634 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Naohisa Noda Hideharu Hayashi 他: "Cytosolic Ca^<2十>concentration and pH of diabetic myocytes during metabolic in hibition" Journal of Molecular and Cellular Cardiology. 24. 435-446 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 林 秀晴 他: "心筋内カルシウムイオン移動の視覚化" 病態生理. 11. 261-265 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 佐藤 洋 林 秀晴 他: "蛍光色素法による心筋細胞内ナトリウム濃度の測定 ーSBFIを用いた検討ー" 心筋の構造と代謝ー1991ー. 14. 127-132 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Hiroshi Satoh: "Quantification of intracellular free sodium ions by using a new fluorescent indicator,sodiumーbinding benzofuran isophthalate in guinea pig myocytes" Biochemical and Biophysical Research Communications. 175. 611-616 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Hideharu Hayashi: "Intracellular Ca^<2+> concentration and pHi during metabolic inhibition" American Journal of Physiology(Cell Physiology). 262. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 林 秀晴: "心筋虚血時および再潅流時不整脈の機序ー低酸素潅流時および再酸素化時のCa^<2+>過負荷と電気的不均一性ー" Japanese Journal of Electrocardiology. 11. 144-150 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 林 秀晴: "Medical Topics Series 不整脈 '91 「再潅流不整脈」" メディカルレビュ-社, 10 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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