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Tissue mitochondrial DNA changes. A stochastic system.

G Kopsidas1, S A Kovalenko, D R Heffernan

  • 1Centre for Molecular Biology & Medicine, Epworth Medical Centre, Melbourne, Victoria, Australia.

Annals of the New York Academy of Sciences
|July 27, 2000
PubMed
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Aging skeletal muscle compensates for declining mitochondrial energy production by increasing glycolysis. This shift is linked to changes in mitochondrial DNA and protein levels, highlighting a metabolic adaptation to aging.

Area of Science:

  • Gerontology
  • Cellular Biology
  • Biochemistry

Background:

  • Mitochondrial function declines with age, particularly in postmitotic tissues like skeletal muscle.
  • Aging skeletal muscle exhibits fiber loss, atrophy, and increased cytochrome c oxidase (COX)-deficient fibers.
  • This decline necessitates alternative energy production pathways, such as glycolysis.

Purpose of the Study:

  • To investigate the age-associated changes in glycolysis and mitochondrial function in rat skeletal muscle.
  • To determine if glycolysis is upregulated as a compensatory mechanism for age-related mitochondrial dysfunction.
  • To explore the role of mitochondrial DNA (mtDNA) damage and conformational changes in age-related bioenergetic decline.

Main Methods:

  • Analysis of key glycolytic enzyme protein levels in rat skeletal muscle (soleus, gracilis, quadriceps) using antibodies.

Related Experiment Videos

  • Measurement of cytochrome c oxidase (COX) protein levels in the same muscle tissues.
  • Examination of mitochondrial DNA (mtDNA) sequence and conformational changes in aged rat and human skeletal muscle.

    • Main Results:

    • Protein levels of glycolytic enzymes (fructose-6-phosphate kinase, aldolase, glyceraldehyde-3-phosphate dehydrogenase, pyruvate kinase) increased in aged rat skeletal muscle.
    • Increased glycolytic enzyme levels correlated with decreased COX protein levels, suggesting a shift in energy metabolism.
    • Age-related conformational changes in mtDNA were observed in tissues with high respiratory demands, but not in predominantly glycolytic muscles.

    Conclusions:

    • Skeletal muscle upregulates glycolysis in response to age-associated declines in mitochondrial energy capacity.
    • Mitochondrial DNA damage and conformational alterations contribute to age-related bioenergetic decline.
    • A dynamic interplay between mutagen production, DNA repair, and mtDNA regulation governs functional mtDNA loss during aging.