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Related Experiment Videos

Cardiac beta-adrenoceptor changes in experimental hyperthyroidism in dogs.

A Hoey1, L Brown, C Marchant

  • 1Department of Physiology and Pharmacology, University of Queensland, St Lucia, Australia.

Clinical and Experimental Pharmacology & Physiology
|November 1, 1992
PubMed
Summary

Experimental hyperthyroidism in dogs, induced by triiodothyronine (T3), increased heart rate responses to isoprenaline and beta-1 adrenoceptor density. Adenylate cyclase activity in ventricular membranes remained unchanged.

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Area of Science:

  • Cardiovascular Physiology
  • Endocrinology
  • Molecular Pharmacology

Background:

  • Hyperthyroidism is associated with cardiovascular changes.
  • The role of beta-adrenoceptor subtypes in mediating these changes requires further elucidation.

Purpose of the Study:

  • To investigate the impact of triiodothyronine (T3)-induced hyperthyroidism on cardiovascular function and beta-adrenoceptor density in dogs.
  • To examine the relationship between altered beta-adrenoceptor density and cardiac function in experimental hyperthyroidism.

Main Methods:

  • Administration of triiodothyronine (T3) to dogs for 14 days, with saline-treated dogs as controls.
  • Measurement of beta-adrenoceptor subtype density using radioligand binding assays.
  • Assessment of in vivo chronotropic responses to isoprenaline.

Related Experiment Videos

  • Evaluation of adenylate cyclase activity in cardiac membranes.

    • Main Results:

    • T3 treatment resulted in physiological signs of hyperthyroidism and significantly increased chronotropic responses to isoprenaline.
    • A substantial increase in beta-1 adrenoceptor density was observed in both right atrial (93%) and left ventricular (141%) membranes.
    • Beta-2 adrenoceptor densities in atrial, ventricular, and lung membranes remained unchanged.
    • Basal and maximally stimulated adenylate cyclase activities in left ventricular membranes were not affected by T3 treatment.

    Conclusions:

    • Experimental hyperthyroidism in dogs enhances chronotropic responses to isoprenaline, correlating with increased cardiac beta-1 adrenoceptor density.
    • The lack of change in adenylate cyclase activity suggests that downstream signaling pathways may not be solely responsible for the observed functional changes.
    • These findings contribute to understanding the complex cardiovascular adaptations during hyperthyroidism.