Abstract
Cosmetic industries focus on developing materials and resources that regulate skin pigmentation. Melanin, the major pigment in human skin, protects the skin against damage from ultraviolet light. An ethanolic extract of the leaves of Callicarpa longissima inhibits melanin production in B16F10 mouse melanoma cells by suppressing microphthalmia-associated transcription factor (MITF) gene expression. Following purification and analysis using liquid chromatography–mass spectrometry (LC–MS), NMR, and biochemical assays, carnosol was determined to be responsible for the major inhibitory effect of the C. longissima extract on melanin production. Carnosol is an oxidative product of carnosic acid, whose presence in the extract was also confirmed by an authentic reference. The carnosol and carnosic acid content in the extract was approximately 16 % (w/w). These results suggest that C. longissima is a novel, useful, and attractive source of skin-whitening agents.
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Acknowledgments
We thank Mrs. Junko Morita, Mr. Sachio Shiga, Mr. Fumihiro Kamada, Dr. Shigeki Katsuki (National Institute of Biomedical Innovation), and Mr. Akihiro Hojo (Kansai University) for providing technical assistance.
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MY and AK are employees of Momotani-juntenkan Co. Ltd., which paid 300,000 JP Yen: 2012 towards the costs of this study. Other contributors declare that they have no conflict of interest.
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This study was funded by Grants-in-Aid for Scientific Research from the Japan Ministry of Health, Labor, and Welfare/AMED (2013–2017, 2014–2016 to HT and HW), and Supported Program for the Strategic Research Foundation at Private Universities (2011–2015: S1101027 to HW and 2013–2017 to HK, YN, and HT) from the Ministry of Education, Culture, Sports Science and Technology Japan.
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Yamahara, M., Sugimura, K., Kumagai, A. et al. Callicarpa longissima extract, carnosol-rich, potently inhibits melanogenesis in B16F10 melanoma cells. J Nat Med 70, 28–35 (2016). https://doi.org/10.1007/s11418-015-0933-5
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DOI: https://doi.org/10.1007/s11418-015-0933-5