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Related Experiment Videos

Intracellular calcium and myocardial function during ischemia

D G Allen1, S P Cairns, S E Turvey

  • 1Department of Physiology, University of Sydney, NSW, Australia.

Advances in Experimental Medicine and Biology
|January 1, 1993
PubMed
Summary

Cardiac ischemia impairs heart muscle function due to reduced protein responsiveness, not calcium release. Increased intracellular calcium during reperfusion correlates with muscle damage.

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Area of Science:

  • Cardiology
  • Biochemistry
  • Physiology

Background:

  • Cardiac ischemia leads to rapid mechanical dysfunction and cell death upon reperfusion.
  • Early mechanical decline may stem from altered intracellular calcium or myofibrillar protein sensitivity.
  • Intracellular calcium levels rise during ischemia, impacting cardiac function.

Purpose of the Study:

  • To elucidate the mechanisms behind the early decline in cardiac mechanical performance during ischemia.
  • To investigate the roles of intracellular calcium, protons, and phosphate in myocardial dysfunction.

Main Methods:

  • Analysis of intracellular ion concentrations (calcium, sodium) and pH during ischemic events.
  • Assessment of myofibrillar protein responsiveness to calcium under varying conditions.

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  • Correlation of reperfusion calcium levels with myocardial damage.

    • Main Results:

    • The early decline in mechanical performance is primarily attributed to inhibitory effects of phosphate and protons on myofibrillar proteins.
    • Intracellular calcium increases during ischemia, driven by sodium influx via the Na/Ca exchanger, itself triggered by Na/H exchanger activity.
    • Elevated intracellular calcium during reperfusion is closely correlated with the extent of myocardial damage.

    Conclusions:

    • Myocardial dysfunction during early ischemia is mainly due to impaired myofibrillar protein function caused by acidosis and phosphate accumulation.
    • Intracellular calcium overload during reperfusion exacerbates myocardial injury.