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Related Experiment Videos

Retinoids and photodamage.

B A Gilchrest1

  • 1USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA.

The British Journal of Dermatology
|September 1, 1992
PubMed
Summary

Topical tretinoin cream effectively improves photodamaged skin, reducing wrinkles and pigmentation. Studies show significant skin appearance and histological improvements with daily use of this retinoid.

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Area of Science:

  • Dermatology
  • Molecular Biology
  • Skin Aging Research

Background:

  • Photodamaged skin exhibits signs like wrinkles, irregular pigmentation, and roughness.
  • Topical retinoids, including tretinoin, are widely investigated for their effects on skin.
  • Understanding tretinoin's cellular mechanisms is crucial for treating photoaging.

Purpose of the Study:

  • To evaluate the efficacy of topical tretinoin in improving the clinical and histological appearance of photodamaged skin.
  • To investigate the dose-dependent effects of tretinoin on skin parameters.
  • To explore the potential cellular mechanisms underlying tretinoin's benefits.

Main Methods:

  • Extensive, well-controlled clinical studies over 5 years.
  • Daily application of topical tretinoin cream (0.001-0.1%).
  • Blinded analysis of skin biopsies from over 500 subjects.

Main Results:

  • Consistent, dose-dependent improvement in skin appearance (roughness, wrinkles, pigmentation, sallowness).
  • Significant decrease in actinic keratoses.
  • Histological changes: stratum corneum compaction, increased granular layers, epidermal thickening, and reduced melanin.

Conclusions:

  • Topical tretinoin cream (0.001-0.1%) offers significant clinical and histological benefits for photodamaged skin.
  • Improvements are observed after 3-6 months of daily treatment.
  • Tretinoin likely improves photoaging by modulating cellular differentiation programs via nuclear retinoic acid receptors (RARs).

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