Abstract
Recently, several clinical studies reported that the photodynamic therapy (PDT) has photorejuvenation effects on the aged skin. Previously, our group introduced evidence of direct effect of PDT on cultured fibroblast (FB). PDT directly stimulated FBs and induced collagen synthesis through activation of extracellular signal–regulated kinase. In this study, we investigated indirect effect of PDT on the human dermal FB during photorejuvenation focused on the epithelial–mesenchymal interaction between keratinocyte (KC) and FB. The “low-level PDT” condition was used for PDT therapy to the cultured KC. Various kinds of cytokines in the supernatants of KC were evaluated by enzyme-linked immunosorbent assay. FBs were stimulated with the KC-conditioned medium (KCM) taken after PDT. The mRNA level of matrix metalloproteinases (MMPs), transforming growth factor (TGF)-β and collagen type Iα in the FB, was determined by real-time polymerase chain reaction. Clinical phtorejuvenation effect was also evaluated from nine patients who had PDT to treat actinic keratoses. Among the FB-stimulating cytokines, a significant elevation of interleukin (IL)-1α, IL-6, and tumor necrosis factor-α level in KCM was noted after PDT compared with controls. After stimulating FB with KCM, the mRNA of MMP-1 was decreased and the mRNA of collagen type Iα was increased compare to control. Clinically, fine wrinkles significantly reduced after PDT. However, coarse wrinkles were not recovered significantly. In conclusion, increased collagen synthesis may be mediated not only by direct effect of PDT on FB but also by indirect effect of PDT on FB through cytokines from KC, such as IL-1α, IL-6, and tumor necrosis factor-α.
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Acknowledgments
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRK), funded by Grant 2014R1A2A1A11052951 and 2013R1A1A2006944 from the Ministry of Education, Science, and Technology.
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Kim, S.K., Koo, GB., Kim, YS. et al. Epithelial–mesenchymal interaction during photodynamic therapy-induced photorejuvenation. Arch Dermatol Res 308, 493–501 (2016). https://doi.org/10.1007/s00403-016-1666-3
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DOI: https://doi.org/10.1007/s00403-016-1666-3