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Related Experiment Videos

The old heart: operating on the edge.

E G Lakatta1, S J Sollott, S Pepe

  • 1National Institute on Aging, Gerontology Research Center, Laboratory of Cardiovascular Science, Baltimore, MD 21224-6825, USA.

Novartis Foundation Symposium
|March 31, 2001
PubMed
Summary
This summary is machine-generated.

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Aging hearts are more susceptible to calcium overload due to cellular changes. Interventions like gene therapy, diet, and antioxidants may reduce this risk in senescent hearts.

Area of Science:

  • Cardiology
  • Cell Biology
  • Aging Research

Background:

  • Cardiac excitation involves calcium (Ca2+) influx, increasing cytosolic Ca2+ (Cai) and contraction.
  • Excessive Ca2+ loading disrupts homeostasis, leading to impaired contraction, arrhythmia, and cell death.
  • Cell Ca2+ load is influenced by membrane properties, regulatory proteins, and reactive oxygen species (ROS).

Purpose of the Study:

  • To investigate the mechanisms underlying increased susceptibility to Ca2+ overload in senescent heart cells.
  • To identify factors contributing to the reduced threshold for pathological Ca2+ loading in aging cardiomyocytes.
  • To explore potential therapeutic strategies for mitigating Ca2+ overload in aging hearts.

Main Methods:

  • Analysis of cellular remodeling in senescent cardiomyocytes.

Related Experiment Videos

  • Examination of changes in membrane composition, including polyunsaturated fatty acids (PUFA).
  • Assessment of reactive oxygen species (ROS) generation in aging cardiac cells.

    • Main Results:

    • Senescent heart cells have a lower threshold for pathological Ca2+ overload during stimulation.
    • Cellular remodeling, altered membrane PUFA ratios (increased omega-6:omega-3), and increased ROS contribute to Ca2+ intolerance.
    • These age-related changes collectively lower the threshold for Ca2+ overload in older hearts.

    Conclusions:

    • Aging compromises cardiac cell Ca2+ handling, increasing vulnerability to overload.
    • Strategies targeting gene expression, membrane lipid composition, and ROS may prevent Ca2+ overload in aging hearts.
    • Potential interventions include gene therapy, dietary adjustments, and antioxidant treatments.