All-trans-retinoic acid down-regulates elastin promoter activity elevated by ultraviolet B irradiation in cultured skin fibroblasts

K.S. LeeS.J. KimY.W. RyooB.C. Kim
Dept. of Dermatology (피부과학)
Issue Date
Journal of Dermatological Science, Vol.17(3) : 182-189, 1998
Topical tretinoin therapy produces clinical improvements in the fine wrinkling of photodamaged skin, possibly by enhancement of collagen synthesis. A major biochemically and histologically detectable change in photodamaged skin is the accumulation of abnormal elastic fibers (elastotic material). However, little is known about the effects of retinoic acid and ultraviolet B (UVB) on elastin gene expression. Consequently, we examined the effects of all-trans-retinoic acid (t-RA) and UVB on elastin gene expression in cultured human skin fibroblasts in vitro. Elastin mRNA gene expression was up-regulated in response to UVB by ≈3-fold, in a dose dependent manner, between 3 and 10 mJ/cm2 doses. Similar results were obtained by chloramphenicol acetyltransferase assay, in which a maximal promoter activation more than 5.4-fold that in nonirradiated controls occurred after a single dose of 20 mJ/cm2. Also, t-RA inhibited the increase in elastin mRNA level following a single exposure to UVB by approximately 16%, and the increase in promotor activity by about 65%. The inhibitory effect of t-RA on elastin induced by UVB was also demonstrated by indirect immunofluorescence studies. Taken together, t-RA down-regulated human elastin gene expression elevated by a single exposure to UVB at transcriptional and possibly protein levels. These results suggest that the anti-photoaging effect of t-RA may be related, at least in part, to down-regulation of elastin gene expression elevated by UVB.
Retinoic acidUVBElastin
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1. Journal Papers (연구논문) > 1. School of Medicine (의과대학) > Dept. of Dermatology (피부과학)
Keimyung Author(s)
이규석; 류영욱; 김병천
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