AGE

, Volume 35, Issue 5, pp 1821–1834

Coenzyme Q10 supplementation reverses age-related impairments in spatial learning and lowers protein oxidation

  • Ritu A. Shetty
  • Michael J. Forster
  • Nathalie Sumien
Article

Abstract

Coenzyme Q10 (CoQ) is widely available as a dietary supplement and remains under consideration as a treatment for age-associated neurodegenerative conditions. However, no studies have determined if supplementation, initiated relatively late in life, could have beneficial effects on mild functional impairments associated with normal brain aging. Accordingly, the current study assessed the effect of CoQ intake in older mice for which cognitive and psychomotor impairments were already evident. Separate groups of young (3.5 months) and relatively old mice (17.5 months) were fed a control diet or a diet supplemented with low (0.72 mg/g) or high (2.81 mg/g) concentrations of CoQ for 15 weeks. After 6 weeks, the mice were given tests for spatial learning (Morris water maze), spontaneous locomotor activity, motor coordination, and startle reflex. Age-related impairments in cognitive and psychomotor functions were evident in the 17.5-month-old mice fed the control diet, and the low-CoQ diet failed to affect any aspect of the impaired performance. However, in the Morris water maze test, old mice on the high-CoQ diet swam to the safe platform with greater efficiency than the mice on the control diet. The old mice supplemented with the high-CoQ diet did not show improvement when spatial performance was measured using probe trials and failed to show improvement in other tests of behavioral performance. Protein oxidative damage was decreased in the mitochondria from the heart, liver, and skeletal muscle of the high-CoQ-supplemented mice and, to some extent, in the brain mitochondria. Contrasting with the deleterious effect of long-term CoQ supplementation initiated during young adulthood previously published, this study suggests that CoQ improves spatial learning and attenuates oxidative damage when administered in relatively high doses and delayed until early senescence, after age-related declines have occurred. Thus, in individuals with age-associated symptoms of cognitive decline, high-CoQ intake may be beneficial.

Keywords

Aging Coenzyme Q10 Ubiquinone Ubidecarenone C57BL/6J Oxidative damage Mitochondria 

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Copyright information

© American Aging Association 2012

Authors and Affiliations

  • Ritu A. Shetty
    • 1
  • Michael J. Forster
    • 1
  • Nathalie Sumien
    • 1
  1. 1.Department of Pharmacology and Neuroscience and Institute for Aging and Alzheimer’s Disease ResearchUniversity of North Texas Health Science Center at Fort WorthFort WorthUSA

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