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Sarcoplasmic reticulum function in the "stunned" myocardium.

U Limbruno1, R Zucchi, S Ronca-Testoni

  • 1Institute of Cardiology, University of Pisa, Italy.

Journal of Molecular and Cellular Cardiology
|October 1, 1989
PubMed
Summary
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Transient ischemia causes "stunned" myocardium by impairing sarcoplasmic reticulum (SR) function. This dysfunction in calcium handling and release channels contributes to prolonged contractile deficits after reperfusion.

Area of Science:

  • Cardiology
  • Cellular Physiology
  • Biochemistry

Background:

  • Transient ischemia, without causing cell death, leads to prolonged myocardial dysfunction known as "stunned" myocardium.
  • The excitation-contraction coupling system, particularly the sarcoplasmic reticulum (SR), is hypothesized to be altered in stunned myocardium.

Purpose of the Study:

  • To investigate the role of sarcoplasmic reticulum (SR) dysfunction in the development of stunned myocardium.
  • To characterize alterations in SR function following a period of transient global ischemia and subsequent reperfusion.

Main Methods:

  • Utilized an isolated rat heart model subjected to 10 minutes of normothermic global ischemia followed by reperfusion.
  • Assessed sarcoplasmic reticulum (SR) function by measuring oxalate-supported Ca-uptake, Ca-stimulated ATPase activity, and the effects of SR Ca-release channel inhibitors (ruthenium red, ryanodine).

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Main Results:

  • Oxalate-supported Ca-uptake was significantly depressed in both whole homogenates and isolated SR post-ischemia.
  • While whole homogenate Ca-uptake recovered during reperfusion, isolated SR Ca-uptake remained depressed, indicating persistent SR impairment.
  • Reduced stimulation of Ca-uptake by SR Ca-release channel inhibitors suggests altered channel conductivity.
  • Ca-stimulated, magnesium-dependent ATPase activity was reduced during ischemia and showed incomplete recovery post-reperfusion.

Conclusions:

  • Transient ischemia induces complex modifications in sarcoplasmic reticulum (SR) function.
  • These SR functional alterations, including impaired calcium handling and altered channel conductivity, likely contribute to the contractile dysfunction observed in stunned myocardium.