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1983 Upjohn Award lecture. Endocrine dysfunction and cardiac performance.

J H McNeill

    Canadian Journal of Physiology and Pharmacology
    |January 1, 1985
    PubMed
    Summary

    Endocrine changes significantly impact rat heart function and drug responses. Hyperthyroidism and hypothyroidism alter cardiac contractility and adrenergic signaling, while diabetes impairs cardiac performance and drug sensitivity.

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    Area of Science:

    • Cardiovascular Physiology
    • Endocrinology
    • Pharmacology

    Background:

    • Endocrine disorders can profoundly affect cardiac function.
    • Understanding these effects is crucial for managing cardiovascular complications.

    Purpose of the Study:

    • To investigate the impact of hyperthyroidism, hypothyroidism, and diabetes on rat cardiac performance.
    • To examine how these endocrine changes alter cardiac biochemistry and responses to cardiotonic drugs.

    Main Methods:

    • Induction of endocrine changes (hyperthyroidism, hypothyroidism, diabetes) in rats.
    • Assessment of cardiac contractility, biochemistry, and responses to adrenergic and muscarinic agents.
    • Evaluation of sarcoplasmic reticulum (SR) Ca2+ uptake in diabetic models.
    • Analysis of drug responses including isoproterenol, carbachol, and ouabain.

    Main Results:

    • Hyperthyroidism increased cardiac contractility and phosphorylase response to catecholamines.
    • Hypothyroidism decreased contraction force but enhanced alpha-adrenergic and decreased beta-adrenergic responses.
    • Diabetes led to decreased cardiac performance and SR Ca2+ uptake, reversible with insulin.
    • Diabetic hearts showed altered responses to cardiotonic drugs, including enhanced phosphorylase response to isoproterenol and decreased ouabain sensitivity.

    Conclusions:

    • Endocrine status significantly modulates cardiac function and drug responsiveness in rats.
    • Insulin therapy can mitigate diabetes-induced cardiac dysfunction.
    • Further research is needed to fully elucidate mechanisms of altered pharmacological responses in diabetic hearts.

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