Background Topical tretinoin (retinoic acid) modifies fine wrinklesand certain other features of human skin damaged by exposureto the sun (photodamage), but histologic changes do not accountfor this improvement. In mice with photodamage induced by ultravioletlight, effacement of fine wrinkles by tretinoin is correlatedwith dermal collagen synthesis but not with histologic changes.We investigated whether collagen synthesis was reduced in photodamagedhuman skin and, if so, whether it could be restored by treatmentwith topical tretinoin.
Methods Biopsies of photodamaged skin from the extensor aspectof the forearm and skin from the buttocks, which had been protectedfrom the sun, were performed on 26 healthy subjects. In addition,29 patients with photodamaged skin were treated for 10 to 12months with a daily application of 0.1 percent tretinoin cream(15 patients) or vehicle cream (14 patients). Skin-biopsy specimensobtained at base line and after treatment were assessed immunohistologicallyfor evidence of dermal collagen I formation (collagen synthesis).
Results Collagen I formation was 56 percent less in the papillarydermis of photodamaged skin than in skin protected from thesun (P<0.001) and was correlated with the clinical severityof photodamage (r = -0.58, P = 0.002). Treatment of photodamagedskin with tretinoin produced an 80 percent increase in collagenI formation, as compared with a 14 percent decrease in collagenformation with the use of vehicle alone (P = 0.006).
Conclusions The formation of collagen I is significantly decreasedin photodamaged human skin, and this process is partly restoredby treatment with tretinoin.
Source Information
From the Dermatopharmacology Unit, Department of Dermatology, University of Michigan Medical Center, Ann Arbor. Presented in part at the annual meeting of the Society for Investigative Dermatology, Washington, D.C., April 28-30, 1993.
Address reprint requests to Dr. Voorhees at the Department of Dermatology, University of Michigan Medical Center, 1910 Taubman Ctr., 1500 E. Medical Ctr. Dr., Ann Arbor, MI 48109-0314.
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