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황지연 ( Ji Yeon Hwang ),이해환 ( Hae Hwan Lee ),장진상 ( Jin Sang Jang ),김영철 ( Young Chul Kim ) 대한미용학회 2015 대한미용학회지 Vol.11 No.3
The objectives of this study was to evaluate the skin-whitening efficacy of Helianthus tuberosus ethanol extract (HTEE) and its mechanism of action in melan-a cells. The total contents of polyphenolics and flavonoids in HTEE were 71.6 and 25.0 mg/g, respectively. At HTEE concentration of 1,000 μg/mL, its electron-donating ability was 28.9%. An MTT assay showed that the maximum permissible HTEE concentration for treatment of melan-a cells was over 200 μg/mL. In comparison with the vehicle control, treatment with HTEE at 100 μg/mL significantly decreased melanin contents (by 11.6%), intracellular tyrosinase activity (by 21.1%), tyrosinase messenger RNA expression (by 11.7%) and its protein level (by 14.4%, all p<0.05). We conclude that HTEE has a considerable skin-whitening efficacy in melan-a cells and this inhibition is exerted through inhibition of tyrosinase transcription. Thus, HTEE can be expected to be useful as a cosmetic skin-whitening agent.