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Aging--causes and defenses

G R Martin1, D B Danner, N J Holbrook

  • 1Gerontology Research Center, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224.

Annual Review of Medicine
|January 1, 1993
PubMed
Summary
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Aging leads to chromosome shortening and mitochondrial DNA damage, increasing disease risk. Understanding these molecular changes offers targets to interrupt age-associated decline and improve health.

Area of Science:

  • Gerontology and Molecular Biology
  • Cellular Aging Mechanisms

Background:

  • Cellular division leads to chromosome shortening.
  • Mitochondrial DNA deletions increase with age due to oxidative stress.
  • Host defenses weaken with age, exacerbating molecular damage.

Purpose of the Study:

  • To review the molecular damage associated with aging.
  • To highlight the link between aging, homeostasis disruption, and disease susceptibility.
  • To identify potential therapeutic targets for age-associated dysfunctions.

Main Methods:

  • Review of recent studies on cellular aging.
  • Analysis of molecular damage markers (chromosome length, mitochondrial DNA integrity).
  • Correlation of molecular changes with host defense attenuation and disease risk.

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Main Results:

  • Chromosome shortening observed with cellular senescence.
  • Significant increase in mitochondrial DNA deletions in aging.
  • Weakened host defenses contribute to age-related molecular damage.
  • Age-associated molecular damage perturbs homeostasis, increasing disease susceptibility.

Conclusions:

  • Aging involves progressive molecular damage at chromosomal and mitochondrial levels.
  • This damage, coupled with reduced defenses, compromises homeostasis.
  • Targeting these age-associated molecular dysfunctions presents opportunities for intervention.