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Effects of Rubus coreanus Miquel on the Expressions of Tyrosinase, TRP-1 and TRP-2 in B16 Melanoma Cells  

Oh, Se-Mi (Department of Herbal Resources, Professional Graduate School of Oriental Medicine, Wonkwang University)
Mun, Yeun-Ja (Department of Herbal Resources, Professional Graduate School of Oriental Medicine, Wonkwang University)
Woo, Won-Hong (Department of Herbal Resources, Professional Graduate School of Oriental Medicine, Wonkwang University)
Publication Information
Journal of Physiology & Pathology in Korean Medicine / v.21, no.6, 2007 , pp. 1456-1461 More about this Journal
Abstract
Melanogenesis is induced mainly by ultraviolet radiation of sunlight and ${\alpha}-melanocyte$-stimulating hormone (${\alpha}-MSH$) which binds to a specific G protein coupled receptor. The purpose of this study was to investigate the mechanism of melanogenesis inhibition in B16/F10 cells by methanol extract of Rubus coreanus Miquel (RCM). In the present study, ${\alpha}-MSH$ and forskolin led to a stimulation of melanin synthesis that appeared to result from an increased tyrosinase activity and melanin content. However, RCM inhibited the ${\alpha}-MSH$- and forskolin-induced melanin synthesis. In addition, RCM abolished the ${\alpha}-MSH$- and forskolin-induced cytoplasmic dendricity. Regarding protein levels of the melanogenic enzymes, the amounts of tyrosinase and tyrosinase-related protein 1 (TRP-1) were increased after incubation with α-MSH and forskolin. The treatment of RCM decreased the ${\alpha}-MSH$- and forskolin-induced expression levels of tyrosinase and TRP-1. Based on these findings, it is likely that RCM exerts its depigmenting effects in B16/F10 cells through the suppression of tyrosinase and TRP-1 expression, which are key enzymes for melanogenesis.
Keywords
Rubus coreanus Miquel; melanin; tyrosinase${\alpha}-MSH$; cAMP;
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