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Related Experiment Videos

Protein modification in aging.

E R Stadtman1, P E Starke-Reed, C N Oliver

  • 1Laboratory of Biochemistry, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892.

EXS
|January 1, 1992
PubMed
Summary
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Aging causes enzyme inactivation due to oxidative damage. Treating old rats with a free radical scavenger restored enzyme activity and improved short-term memory, linking oxidative stress to age-related cognitive decline.

Area of Science:

  • Biochemistry
  • Gerontology
  • Neuroscience

Background:

  • Enzymes become less active or inactive during aging.
  • Oxidative stress from reactive oxygen species contributes to age-related protein damage.

Purpose of the Study:

  • To investigate the link between age-dependent oxidized protein accumulation and loss of physiological function.
  • To determine if reducing oxidative stress can reverse age-related biochemical and cognitive changes.

Main Methods:

  • Measured levels of oxidized proteins in human fibroblasts and rat liver/brain tissues across different ages.
  • Assessed enzyme activities (glutamine synthetase, glucose-6-P dehydrogenase) and protease activity in aging rats.
  • Evaluated short-term memory in gerbils using the radial arm maze.

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  • Administered N-tert-butyl-alpha-phenylnitrone (PBN) to old rats to assess its effects on biochemical parameters and memory.

    • Main Results:

    • Oxidized protein levels increase with age in human cells and rat tissues.
    • Aging rats showed decreased enzyme activities and impaired protein degradation.
    • Gerbils exhibited age-related memory loss correlating with brain biochemical changes.
    • PBN treatment normalized biochemical markers and restored memory function in old rats.

    Conclusions:

    • Age-dependent accumulation of oxidized proteins is linked to functional decline.
    • Oxidative stress plays a significant role in aging processes and cognitive impairment.
    • Free radical scavenging presents a potential therapeutic strategy for age-related functional loss.