n-(4-hydroxy-beta-phenethyl)-4-hydroxycinnamide and dopaquinone

Aurea Helianthus (AH), also known as wild confederate rose or golden sunflower, is a curative herb. It has been used as a medicinal material in China due to its anti-inflammatory, immune regulatory, and anti-oxidant activities. However, its melanogenic effect on skin has not been sufficiently investigated. In this study, we tested whether AH has melanogenic inhibitory activities for the development of effective skin whitening agent. The extract showed inhibition of melanin synthesis and reduced the oxidation of 3, 4-dihydroxyphenilalanine (DOPA) to o-dopaquinone. Additionally, AH downregulated the levels of microphthalmia-associated transcription factor (MITF), tyrosinase and tyrosinase related proteins (TRPs), suggesting that AH has inhibitory effects on melanogenesis. Analysis of the components of AH showed that it contained paprazine and trans-N-feruloyltyramine (FA). We confirmed that the effect of AH resulted from paprazine and FA. Therefore, AH might have potential as an effective candidate for skin whitening.

Topics: Animals; Antineoplastic Agents, Phytogenic; Benzoquinones; Cell Line, Tumor; Coumaric Acids; Dihydroxyphenylalanine; Down-Regulation; Helianthus; Melanins; Melanoma, Experimental; Mice; Microphthalmia-Associated Transcription Factor; Monophenol Monooxygenase; Plant Extracts; Plant Proteins; Plant Stems; Skin Lightening Preparations; Tyramine; Tyrosine