Abstract
Withania somnifera has been used in folk medicine to treat various ailments for centuries. In this studies to investigate the whitening effect of Withania somnifera extracts as an active ingredient for whitening cosmet- ics, the antioxidant capacity and the effects of Withania somnifera extracts on melanogenesis in B16-F10 melanoma cells were identified. Withania somnifera extracts significantly reduced both tyrosinase activity and melanin content in a concentration-dependent manner. Furthermore, it was found that Withania somnifera extracts decreased α-MSH (melanocyte-stimulating hormone)-induced tyrosinase activity and MITF(microphthalmia associated transcription factor) protein expression. These data indicate that Withania somnifera extracts attenuate α-MSH-stimulated melanin synthesis by modulating MITF expression and that they may be a useful therapeutic agent for treating hyperpigmen- tation and an ingredient of whitening cosmetics.
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