Topical all-trans retinoic acid (RA) induces an early, coordinated increase in RA-inducible skin-specific gene/psoriasin and cellular RA-binding protein II mRNA levels which precedes skin erythema

Arch Dermatol Res. 1996 Oct;288(11):664-9. doi: 10.1007/BF02505275.


Separation of specific and nonspecific "irritant" effects of topical all-trans retinoic acid (RA) is a key to understanding the mechanism of retinoid action in skin. Cellular RA-binding protein (CRABP) II has been found to be a marker of RA activity in human skin. We have also previously identified a skin-specific gene (RIS-1/psoriasin) which is rapidly induced in human skin treated with RA. Here we compared the kinetics and time-course of RIS-1 and CRABP II gene activation by RA, sodium lauryl sulfate (SLS), a classical irritant, and their vehicle (VH), using a quantitative reverse transcription polymerase chain reaction. RIS-1 and CRABP II were both expressed at very low levels in untreated normal human skin, and in RA-treated skin the kinetics and time course of RIS-1 and CRABP II mRNA induction were similar. Relative to VH-treated skin, RA induced RIS-1 mRNA levels within 6 h, which further increased to 6.4-fold by 24 h (n = 4). Similarly, CRABP II mRNA levels increased from 2.6-fold at 6 h to 7.8-fold after 24 h. At 48 h the relative mRNA levels for both genes decreased towards the steady-state levels. Relative to SLS-treated skin, RIS-1 mRNA increased by 3.2-fold after 6 h and by 5.1-fold after 12 h (n = 3). Also, a 2.6-fold higher CRABP II mRNA observed after 6 h increased to 6-fold after 12 h. After 24 and 48 h RA treatment the relative mRNA levels for both genes decreased towards the steady-state levels. RA-induced skin erythema was not obvious until 24 to 48 h. We conclude, therefore, that induction of RIS-1 and CRABP II mRNA levels by topical RA in human skin are early, coordinated molecular events which precede the clinical cutaneous erythematous response to RA.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Topical
  • Base Sequence
  • Calcium-Binding Proteins / genetics*
  • DNA Primers / genetics
  • Erythema / chemically induced*
  • Erythema / metabolism
  • Gene Expression Regulation / drug effects
  • Humans
  • Kinetics
  • Polymerase Chain Reaction
  • RNA, Messenger / genetics*
  • RNA, Messenger / metabolism*
  • Receptors, Retinoic Acid / genetics*
  • S100 Calcium Binding Protein A7
  • S100 Proteins
  • Skin / drug effects*
  • Skin / metabolism*
  • Transcriptional Activation
  • Tretinoin / administration & dosage*
  • Tretinoin / adverse effects*


  • Calcium-Binding Proteins
  • DNA Primers
  • RNA, Messenger
  • Receptors, Retinoic Acid
  • S100 Calcium Binding Protein A7
  • S100 Proteins
  • S100A7 protein, human
  • retinoic acid binding protein II, cellular
  • Tretinoin