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Hypopigmentary Effect of Milk Thistle Extract Silymarin  

Yoo, Ick-Dong (National Cosmeceuticals Research Center, Korea Research Institute of Bioscience and Biotechnology)
Choo, Soo-Jin (National Cosmeceuticals Research Center, Korea Research Institute of Bioscience and Biotechnology)
Ryoo, In-Ja (National Cosmeceuticals Research Center, Korea Research Institute of Bioscience and Biotechnology)
Kim, Young-Hee (National Cosmeceuticals Research Center, Korea Research Institute of Bioscience and Biotechnology)
Xu, Guang-Hua (National Cosmeceuticals Research Center, Korea Research Institute of Bioscience and Biotechnology)
Kim, Ki-Ho (R&D Center, Bioland Ltd.)
Han, Chang-Sung (R&D Center, Bioland Ltd.)
Kim, Su-Jin (Ellead Skin Research Center)
Kim, Jin-Woong (Amorepacific Corporation R&D Center)
Son, Eui-Dong (Amorepacific Corporation R&D Center)
Publication Information
Journal of the Society of Cosmetic Scientists of Korea / v.35, no.2, 2009 , pp. 151-158 More about this Journal
Abstract
We found that silymarin exhibited the inhibitory effect on melanogenesis in a spontaneously immortalized mouse melanocyte cell line, Mel-Ab. Silymarin is a standardized extract obtained from the dried seeds of milk thistle (Silybum marianum Gaertn.). Silymarin significantly prevented melanin production in a dose-dependent manner with an $IC_{50}$ value of 28.2 ${\mu}g/mL$ without effects on cell viability. Also, silymarin inhibited tyrosinase activity in melanocyte, while it did not affect the catalytic activity of cell-free tyrosinase. Furthermore, Western blot analysis indicated that silymarin decreased the expression of tyrosinase protein. Silybin A/B and isosilybin A/B were also able to inhibit melanin production and tyrosinase expression in protein level. Double blind study on the clinical efficacy of a cream containing 2 % silymarin showed that silymarin have a significant skin whitening effect. Therefore, this study suggests that silymarin may be useful as a natural skin whitening agent.
Keywords
melanogenesis; silymarin; tyrosinase activity; silybin; skin whitening;
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