Regulation of retinoid-mediated signaling involved in skin homeostasis by RAR and RXR agonists/antagonists in mouse skin

PLoS One. 2013 Apr 24;8(4):e62643. doi: 10.1371/journal.pone.0062643. Print 2013.

Abstract

Endogenous retinoids like all-trans retinoic acid (ATRA) play important roles in skin homeostasis and skin-based immune responses. Moreover, retinoid signaling was found to be dysregulated in various skin diseases. The present study used topical application of selective agonists and antagonists for retinoic acid receptors (RARs) α and γ and retinoid-X receptors (RXRs) for two weeks on mouse skin in order to determine the role of retinoid receptor subtypes in the gene regulation in skin. We observed pronounced epidermal hyperproliferation upon application of ATRA and synthetic agonists for RARγ and RXR. ATRA and the RARγ agonist further increased retinoid target gene expression (Rbp1, Crabp2, Krt4, Cyp26a1, Cyp26b1) and the chemokines Ccl17 and Ccl22. In contrast, a RARα agonist strongly decreased the expression of ATRA-synthesis enzymes, of retinoid target genes, markers of skin homeostasis, and various cytokines in the skin, thereby markedly resembling the expression profile induced by RXR and RAR antagonists. Our results indicate that RARα and RARγ subtypes possess different roles in the skin and may be of relevance for the auto-regulation of endogenous retinoid signaling in skin. We suggest that dysregulated retinoid signaling in the skin mediated by RXR, RARα and/or RARγ may promote skin-based inflammation and dysregulation of skin barrier properties.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cluster Analysis
  • Epidermis / drug effects
  • Epidermis / metabolism
  • Female
  • Gene Expression Profiling
  • Gene Expression Regulation / drug effects
  • Homeostasis* / drug effects
  • Homeostasis* / immunology
  • Mice
  • Receptors, Retinoic Acid / agonists*
  • Receptors, Retinoic Acid / antagonists & inhibitors*
  • Receptors, Retinoic Acid / metabolism
  • Retinoic Acid Receptor alpha
  • Retinoic Acid Receptor gamma
  • Retinoid X Receptors / agonists*
  • Retinoid X Receptors / antagonists & inhibitors*
  • Retinoids / metabolism*
  • Signal Transduction* / drug effects
  • Skin / drug effects
  • Skin / immunology
  • Skin / metabolism*
  • Tretinoin / metabolism
  • Tretinoin / pharmacology

Substances

  • Rara protein, mouse
  • Receptors, Retinoic Acid
  • Retinoic Acid Receptor alpha
  • Retinoid X Receptors
  • Retinoids
  • Tretinoin

Grants and funding

The project is implemented through the New Hungary Development Plan, co-financed by the European Social fund. RR is member of the COST actions BM0903 “SkinBAD-skin barrier and atopic diseases” and BM1007 “Mast Cells and Basophils – Targets for Innovative Therapies”. DT is supported by the DEOEC BMC Korea 4/2011 grant. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.