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Assessment of Myofilament Ca2+ Sensitivity Underlying Cardiac Excitation-contraction Coupling
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Testosterone modulates cardiomyocyte Ca(2+) handling and contractile function.

C L Curl1, L M D Delbridge, B J Canny

  • 1Department of Physiology, University of Melbourne, Parkville, Victoria, Australia. ccurl@unimelb.edu.au

Physiological Research
|April 3, 2008
PubMed
Summary
This summary is machine-generated.

Testosterone directly impacts heart muscle function. Testosterone withdrawal in rats reduced cardiomyocyte contractility and altered calcium handling, effects reversed by testosterone replacement.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Molecular Biology

Background:

  • Sex differences in cardiac function are observed, but the direct role of testosterone on myocardial function remains unclear.
  • Testosterone's influence on cardiac contractility and calcium handling requires further elucidation.

Purpose of the Study:

  • To investigate the effects of testosterone withdrawal and replacement on cardiomyocyte shortening and intracellular calcium handling in a rat model.
  • To determine if testosterone directly influences myocardial contractility and calcium dynamics.

Main Methods:

  • Rats underwent gonadectomy (GDX) to withdraw testosterone, followed by testosterone replacement (GDX+T) or sham operation.
  • Cardiomyocyte shortening and intracellular calcium (Ca2+) handling were measured at various extracellular Ca2+ concentrations (0.5-2.0 mM) and a fixed temperature (25 °C) and frequency (0.5 Hz).

Main Results:

  • Gonadectomy significantly reduced Ca2+ transient amplitude by approximately 50% and prolonged Ca2+ transient decay time (tau) in cardiomyocytes.
  • GDX significantly reduced maximum cardiomyocyte shortening by over 60% and delayed relaxation by over 35%.
  • Testosterone replacement (GDX+T) completely reversed these deficits, restoring normal contractility and Ca2+ handling.

Conclusions:

  • Testosterone plays a direct role in regulating cardiomyocyte contractility and intracellular Ca2+ handling.
  • Testosterone withdrawal leads to hypocontractility and impaired Ca2+ handling in the heart.
  • Testosterone replacement therapy can effectively reverse testosterone-induced cardiac dysfunction.