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Updated: Dec 31, 2025

Analysis of Cardiac Contractile Dysfunction and Ca2+ Transients in Rodent Myocytes
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Examining Cardiomyocyte Dysfunction Using Acute Chemical Induction of an Ageing Phenotype.

Said Masoud1, Fraser McDonald2, Dirk Bister2

  • 1School of Life, Health and Chemical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK.

International Journal of Molecular Sciences
|January 2, 2020
PubMed
Summary

Hydroxyurea treatment in vitro effectively mimics cardiac aging in neonatal rat ventricular myocytes. This method offers a valuable alternative to longitudinal studies for investigating age-related cardiac dysfunction.

Keywords:
ageingalternansarrhythmiacalciumcardiacremodelling

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Area of Science:

  • Cardiovascular Biology
  • Cellular Aging
  • Biomedical Research

Background:

  • Age-dependent deterioration of cardiac performance is a significant concern.
  • Longitudinal studies in aged animals reveal changes in contractile myocytes.
  • Alternative experimental approaches are needed to model cardiac aging phenotypes.

Purpose of the Study:

  • To investigate the utility of hydroxyurea for inducing an aging cardiomyocyte phenotype ex vivo.
  • To determine if hydroxyurea can recapitulate age-related changes in cardiac cells.
  • To explore an alternative to longitudinal studies for cardiac aging research.

Main Methods:

  • Neonatal rat ventricular myocytes were incubated with hydroxyurea for up to 7 days.
  • Functional assessments included systolic calcium responses, alternans, and electrical pacing.
  • Structural and biochemical analyses involved lipofuscin accumulation, mitochondrial potential, reactive oxygen species, and ultrastructure.

Main Results:

  • Hydroxyurea incubation replicated key aspects of cardiac aging, including reduced calcium handling and impaired electrical following.
  • Observed changes included lipofuscin accumulation, decreased mitochondrial membrane potential, and increased reactive oxygen species production.
  • Ultrastructural alterations revealed disrupted mitochondria and disorganized myofibrils, indicative of aging-like remodeling.

Conclusions:

  • Hydroxyurea incubation is a viable method to induce an aging cardiomyocyte phenotype in vitro.
  • This approach effectively models age-related functional and structural changes in cardiac cells.
  • This ex vivo method provides a cost-effective and controlled alternative to longitudinal aging studies.