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Related Experiment Videos

Progress and problems in understanding the involvement of calcium in heart function.

N S Dhalla, P K Singal, V Panagia

    Canadian Journal of Physiology and Pharmacology
    |July 1, 1984
    PubMed
    Summary

    Calcium (Ca2+) regulates cardiac muscle contraction and relaxation. Understanding Ca2+ movements in normal and diseased hearts is crucial for improving heart disease therapy.

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    Area of Science:

    • Cardiovascular Physiology
    • Cellular Biology
    • Pharmacology

    Background:

    • Cardiac contraction and relaxation are regulated by intracellular free calcium ion (Ca2+) concentrations.
    • Ca2+ enters the cell via sarcolemma and is released from the sarcoplasmic reticulum and mitochondria.
    • Muscle relaxation depends on Ca2+ efflux and sequestration by intracellular sites.

    Purpose of the Study:

    • To review the role of Ca2+ in myocardial excitation-contraction coupling.
    • To explain the effects of pharmacological and pathophysiological interventions on subcellular Ca2+ movements.
    • To highlight the importance of understanding Ca2+ dynamics for heart disease therapy.

    Main Methods:

    • Review of existing literature on Ca2+ handling in myocardium.

    Related Experiment Videos

  • Analysis of Ca2+-ATPase and Na+-K+ ATPase activities in cardiac sarcolemma.
  • Examination of Ca2+ movements in normal and cardiomyopathic hamster models.

    • Main Results:

    • Quinidine, procainamide, and lidocaine increased sarcolemmal Ca2+-ATPase activity.
    • In cardiomyopathic hamsters, both Ca2+-ATPase and Na+-K+ ATPase activities were elevated.
    • Increased Ca2+-ATPase may lead to intracellular Ca2+ overload, while increased Na+-K+ ATPase may enhance Ca2+ efflux.

    Conclusions:

    • Subcellular Ca2+ movements are key to understanding cardiac function and dysfunction.
    • Pharmacological agents and disease states alter Ca2+ handling in the myocardium.
    • Further research into Ca2+ pathophysiology and pharmacology is needed to improve cardiac therapies.