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Related Experiment Videos

Mitochondrial coenzyme Q content and aging.

A Lass1, L Kwong, R S Sohal

  • 1Department of Biological Sciences, Southern Methodist University, Dallas, TX 75275, USA.

Biofactors (Oxford, England)
|July 23, 1999
PubMed
Summary

Aging reduces mitochondrial coenzyme Q (CoQ) levels specifically in skeletal muscle. Caloric restriction temporarily increased CoQ9 in this tissue, suggesting a link between metabolism and aging-related CoQ decline.

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Area of Science:

  • Mitochondrial biochemistry
  • Aging research
  • Nutritional science

Background:

  • Mitochondrial coenzyme Q (CoQ) is crucial for cellular energy production.
  • The relationship between aging and CoQ content in different tissues is not fully understood.
  • CoQ exists in different forms, primarily Coenzyme Q9 (CoQ9) and Coenzyme Q10 (CoQ10).

Purpose of the Study:

  • To investigate the impact of aging on mitochondrial CoQ content in various mouse tissues.
  • To determine tissue-specific differences in CoQ composition (CoQ9 vs. CoQ10) during aging.
  • To examine the effect of caloric restriction (CR) on mitochondrial CoQ levels in aged skeletal muscle.

Main Methods:

  • Mitochondria were isolated from heart, skeletal muscle, kidney, and brain of aged mice.
  • Total CoQ content and the ratio of CoQ9 to CoQ10 were quantified.
  • Mice underwent a caloric restriction regimen, followed by analysis after its termination.

Main Results:

  • Mitochondrial CoQ content varied across tissues and with age.
  • A significant decline in CoQ content was observed exclusively in aged skeletal muscle.
  • Caloric restriction led to increased CoQ9 in skeletal muscle mitochondria, an effect partially reversible upon diet cessation.

Conclusions:

  • A decrease in mitochondrial CoQ content is a characteristic feature of aging in skeletal muscle.
  • Skeletal muscle mitochondrial CoQ levels are sensitive to nutritional interventions like caloric restriction.
  • These findings highlight the role of CoQ in age-related skeletal muscle decline and potential mitigation strategies.

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