c-Jun-dependent inhibition of cutaneous procollagen transcription following ultraviolet irradiation is reversed by all-trans retinoic acid

J Clin Invest. 2000 Sep;106(5):663-70. doi: 10.1172/JCI9362.

Abstract

The aged appearance of skin following repeated exposure to solar ultraviolet (UV) irradiation stems largely from damage to cutaneous connective tissue, which is composed primarily of type I and type III collagens. We report here that a single exposure to UV irradiation causes significant loss of procollagen synthesis in human skin. Expression of type I and type III procollagens is substantially reduced within 24 hours after a single UV exposure, even at UV doses that cause only minimal skin reddening. Daily UV exposures over 4 days result in sustained reductions of both type I and type III procollagen protein levels for at least 24 hours after the final UV exposure. UV inhibition of type I procollagen synthesis is mediated in part by c-Jun, which is induced by UV irradiation and interferes with procollagen transcription. Pretreatment of human skin in vivo with all-trans retinoic acid inhibits UV induction of c-Jun and protects skin against loss of procollagen synthesis. We have reported previously that UV irradiation induces matrix-degrading metalloproteinases in human skin and that pretreatment of skin with all-trans retinoic acid inhibits this induction. UV irradiation, therefore, damages human skin connective tissue by simultaneously inhibiting procollagen synthesis and stimulating collagen breakdown. All-trans retinoic acid protects against both of these deleterious effects and may thereby retard premature skin aging.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Dose-Response Relationship, Radiation
  • European Continental Ancestry Group
  • Female
  • Gene Expression Regulation
  • Humans
  • In Situ Hybridization
  • Male
  • Procollagen / biosynthesis*
  • Procollagen / genetics
  • Proto-Oncogene Proteins c-jun / metabolism*
  • Radiation-Protective Agents / pharmacology
  • Skin / radiation effects*
  • Skin Aging / drug effects
  • Transcription, Genetic / drug effects
  • Tretinoin / pharmacology*
  • Ultraviolet Rays / adverse effects*

Substances

  • Procollagen
  • Proto-Oncogene Proteins c-jun
  • Radiation-Protective Agents
  • Tretinoin