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Hallmarks of Skin Aging: Update.

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Skin aging involves seven key hallmarks, including genomic instability, epigenetic alterations, and cellular senescence. These factors contribute to impaired skin function and increased disease susceptibility over time.

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Area of Science:

  • Gerontology
  • Dermatology
  • Molecular Biology

Background:

  • Aging is characterized by a decline in physiological integrity and function, increasing vulnerability to diseases.
  • The skin, as the body's largest organ, exhibits significant age-related changes, becoming more susceptible to damage.

Purpose of the Study:

  • To systematically review the hallmarks of skin aging.
  • To categorize these hallmarks into primary, antagonistic, and integrative factors.

Main Methods:

  • Systematic review of scientific literature on skin aging.
  • Identification and categorization of seven key hallmarks of skin aging.

Main Results:

  • Seven hallmarks of skin aging were identified: genomic instability and telomere attrition, epigenetic alterations and loss of proteostasis, deregulated nutrient-sensing, mitochondrial damage and dysfunction, cellular senescence, stem cell exhaustion/dysregulation, and altered intercellular communication.
  • These hallmarks were classified into three categories: primary (causes of damage), antagonistic (responses to damage), and integrative (culprits of the aged phenotype).

Conclusions:

  • Understanding the hallmarks of skin aging provides a framework for studying age-related skin decline.
  • The categorization offers insights into the complex mechanisms driving skin aging and potential therapeutic targets.