Molecular and Cellular Biochemistry

, Volume 99, Issue 2, pp 125–133 | Cite as

Alterations in cardiac membrane Ca2+ transport during oxidative stress

  • Ian M. C. Dixon
  • Masanori Kaneko
  • Tomoji Hata
  • Vincenzo Panagia
  • Naranjan S. Dhalla
Invited Paper
Accepted:

Abstract

Although cardiac dysfunction due to ischemia-reperfusion injury is considered to involve oxygen free radicals, the exact manner by which this oxidative stress affects the myocardium is not clear. As the occurrence of intracellular Ca2+ overload has been shown to play a critical role in the genesis of cellular damage due to ischemia-reperfusion, this study was undertaken to examine whether oxygen free radicals are involved in altering the sarcolemmal Ca2+-transport activities due to reperfusion injury. When isolated rat hearts were made globally ischemic for 30 min and then reperfused for 5 min, the Ca2+ -pump and Na+-Ca2+ exchange activities were depressed in the purified sarcolemmal fraction; these alterations were prevented when a free radical scavenger enzymes (superoxide dismutase plus catalase) were added to the reperfusion medium. Both the Ca2+- pump and Na+- Ca2+ exchange activities in control heart sarcolemmal preparations were depressed by activated oxygen-generating systems containing xanthine plus xanthine oxidase and H2O2; these changes were prevented by the inclusion of superoxide dismutase and catalase in the incubation medium. These results support the view that oxidative stress during ischemia-reperfusion may contribute towards the occurrence of intracellular Ca2+ overload and subsequent cell damage by depressing the sarcolemmal mechanisms governing the efflux of Ca2+ from the cardiac cell.

Key words

sarcolemmal Ca2+ uptake Ca2+-stimulated ATPase sarcolemmal sodium-calcium exchange superoxide ion radical hydrogen peroxide hydroxyl radical ischemic heart heart sarcolemmal membrane 
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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Ian M. C. Dixon
    • 1
    • 2
  • Masanori Kaneko
    • 1
    • 2
  • Tomoji Hata
    • 1
    • 2
  • Vincenzo Panagia
    • 1
    • 2
  • Naranjan S. Dhalla
    • 1
    • 2
  1. 1.Division of Cardiovascular SciencesSt. Boniface General Hospital Research CentreWinnipegCanada
  2. 2.Department of Physiology, Faculty of MedicineUniversity of ManitobaWinnipegCanada

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