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Marked improvement induced in photoaged skin of hairless mouse by ER36009, a novel RARγ‐specific retinoid, but not by ER35794, an RXR‐selective agonist
Author(s) -
Sakuta Tomohiro,
Kanayama Toshiji
Publication year - 2006
Publication title -
international journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 93
eISSN - 1365-4632
pISSN - 0011-9059
DOI - 10.1111/j.1365-4632.2006.02913.x
Subject(s) - photoaging , hairless , agonist , retinoid , retinoic acid , retinoid x receptor , medicine , skin aging , retinoic acid receptor , endocrinology , wrinkle , pharmacology , receptor , dermatology , chemistry , nuclear receptor , biochemistry , transcription factor , gene , gerontology
Background Photoaging (premature skin aging) results largely from repeated exposure of the skin to ultraviolet (UV) radiation from the sun. Topical all‐ trans retinoic acid (RA), the only agent that has been approved for the treatment of photoaging, has been shown to reverse this process. In this study, we evaluated the pharmacologic effects of novel synthetic retinoids, ER36009 and ER35794, on murine wrinkles induced by UVB. ER36009 is a specific agonist of retinoic acid receptor (RAR)γ, the most abundant RAR subtype in the skin, while ER35794 is a potent retinoid X receptor (RXR)‐selective agonist. Method After a 10‐week exposure to escalating doses of UVB irradiation, the animals were treated three times per week with ER36009 (0.0001%, 0.00025%, 0.0005%), ER35794 (0.025%, 0.05%, 0.1%), RA (0.05%) or acetone (control) for 3 weeks. Results ER36009 exerted a dose‐dependent wrinkle‐effacing effect, and 0.0005% ER36009‐treated skin was significantly different from the control. ER36009 also significantly and dose‐dependently increased both epidermal thickness and the area of the dermal repair zone defined by newly synthesized collagen. The effect of 0.0005% ER36009 on photodamaged skin was superior to that of 0.05% RA. In contrast, ER35794 was inactive in this model, though this compound exhibited lower local toxicity than other retinoids. Conclusions These data indicate that RARγ, but not RXR, plays an important role in the improvement of the signs of photoaging, and so a specific RARγ agonist might be superior to an RAR pan‐agonist for clinical treatment. We conclude that ER36009 is a candidate for a potent anti‐skin‐aging agent.