Abstract
We investigated the effects of puerarin (8-C-glucosyl-7,4′-dihydroxy isoflavone), an isoflavone found in Kudzu roots (Pueraria lobata), and its glycosides (enzymatically synthesised, water-soluble derivatives of puerarin) on melanogenesis in vitro. Puerarin and its glycosides reduced mushroom tyrosinase activity by 88 and 67% at 4.8 mM, respectively, in a concentration-dependent manner. The puerarin glycosides were less effective than puerarin at the same concentration but showed a comparable inhibitory effect at a concentration at which puerarin is insoluble in water. In cultured B16 melanocytes, the melanin content was reduced significantly; moreover, tyrosinase activity was inhibited significantly by both puerarin and its glycosides when added at a concentration of 480 μM. DNA microarray and RT-PCR analyses showed significant downregulation of the expression of microphthalmia-associated transcription factor (MITF) and its target genes. The protein expression of MITF and tyrosinase was also downregulated significantly by 40 and 50%, respectively. Our findings suggest that puerarin and its glycosides cause hypopigmentation via dual mechanisms: by inhibiting tyrosinase activity directly and by altering the expression of melanogenesis-related genes, such as MITF and tyrosinase. Therefore, puerarin and its glycosides may have potential for the development of functional cosmetics causing hypopigmentation.
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Acknowledgments
This study was supported by a grant from the Korea Health 21 R&D Project, Ministry of Health and Welfare, Republic of Korea (A050376), and by the Technology Development Program of the Ministry of Agriculture and Forestry (105054-03-2-HD110).
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Choi, YM., Jun, Hj., Dawson, K. et al. Effects of the isoflavone puerarin and its glycosides on melanogenesis in B16 melanocytes. Eur Food Res Technol 231, 75–83 (2010). https://doi.org/10.1007/s00217-010-1251-5
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DOI: https://doi.org/10.1007/s00217-010-1251-5