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Age-dependent decrease in the cytochrome c oxidase activity and changes in phospholipids in rat-heart mitochondria.

G Paradies1, F M Ruggiero, G Petrosillo

  • 1Department of Biochemistry and Molecular Biology and C.N.R. Unit for the Study of Mitochondria and Bioenergetics, Bari, Italy.

Archives of Gerontology and Geriatrics
|May 1, 1993
PubMed
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Aging reduces heart mitochondrial function by decreasing cardiolipin content, impacting cytochrome c oxidase activity. This study reveals key age-related changes in mitochondrial kinetics.

Area of Science:

  • Biochemistry
  • Mitochondrial Biology
  • Aging Research

Background:

  • Mitochondrial dysfunction is a hallmark of aging.
  • Cytochrome c oxidase (COX) is a key enzyme in the electron transport chain, crucial for cellular respiration.
  • Age-related changes in COX kinetics and composition are not fully understood.

Purpose of the Study:

  • To investigate the effects of aging on the kinetic properties of rat heart mitochondrial cytochrome c oxidase.
  • To identify molecular factors contributing to age-associated alterations in COX activity.

Main Methods:

  • Mitochondria were isolated from young and aged rat hearts.
  • Kinetic parameters (Km, Vmax) of cytochrome c oxidase were determined.
  • Cytochrome aa3 content, cardiolipin levels, and phospholipid fatty acid distribution were analyzed.

Related Experiment Videos

  • Arrhenius plots were used to assess temperature-dependent activity.

    • Main Results:

    • Maximal activity (Vmax) of cytochrome c oxidase was significantly reduced in aged rat mitochondria, while Km for cytochrome c remained unchanged.
    • Cytochrome aa3 content was equivalent between young and aged groups.
    • Arrhenius plots showed a higher temperature breakpoint for COX activity in aged mitochondria.
    • Cardiolipin content was markedly decreased in mitochondrial membranes from aged rats, with no changes in phospholipid fatty acid distribution.

    Conclusions:

    • Reduced maximal activity of cytochrome c oxidase in aged rat hearts is linked to decreased cardiolipin content.
    • Cardiolipin depletion, not changes in cytochrome aa3 or fatty acid profiles, is a primary factor in age-related COX dysfunction.