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Cardiac myosin. Phylogenic and pathological changes.

B Swynghedauw, K Schwartz, J J Léger

    Basic Research in Cardiology
    |March 1, 1977
    PubMed
    Summary
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    Cardiac myosin, tropomyosin, and troponin are species-specific proteins. Their properties change with factors like thyroxine and exercise, but their role in heart failure remains unclear.

    Area of Science:

    • Muscle physiology
    • Cardiac biochemistry

    Background:

    • Sarcomere proteins exhibit muscle-specific variations.
    • Cardiac myosin, tropomyosin, and troponin are species-specific.
    • Cardiac myosin properties are influenced by thyroxine, exercise, and overloading.

    Purpose of the Study:

    • To investigate the species specificity of cardiac contractile proteins.
    • To explore the impact of physiological and pathological conditions on cardiac myosin properties.
    • To determine if myosin modifications in heart overloading are a primary defect or an adaptive response.

    Main Methods:

    • Comparative analysis of sarcomere protein expression across different muscles and species.
    • Biochemical characterization of cardiac myosin under various experimental conditions (thyroxine, exercise, overloading).

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  • Assessment of myocardial contractility and protein synthesis rates.

    • Main Results:

    • Confirmed species specificity for cardiac myosin, tropomyosin, and troponin.
    • Demonstrated that cardiac myosin properties are modifiable by external factors.
    • Observed correlations between myosin property changes, muscle shortening velocity, and protein synthesis stimulation.

    Conclusions:

    • Cardiac contractile proteins display significant species-specific differences.
    • Modifications in cardiac myosin properties are linked to functional adaptations.
    • The precise role of myosin alterations in the pathophysiology of heart failure requires further investigation.