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• W2906610295 abstract "BACKGROUND AND PURPOSE Kazinol U is a prenylated flavan isolated from an extract of Broussonetia kazinoki Sieb (Moraceae). Kazinol U has shown cytoprotective effects against cytokine-induced apoptotic cell death and induces AMP kinase (AMPK) activation through LKB1 activation. However, kazinol U has not been tested as a regulator of melanogenesis, although bark extract of B. kazinoki has been used as a cosmetic ingredient for skin conditioning. EXPERIMENTAL APPROACH We cultured mouse, human melanoma cells and normal human melanocytes to demonstrate anti-melanogenic effects of kazinol U. A tyrosinase activity assay, Western blot, RT-qPCR and a luciferase reporter gene assay were performed to determine the anti-melanogenic mechanisms of kazinol U. We confirmed its effect on melanogenesis in vivo using zebrafish. KEY RESULTS Kazinol U inhibited the expression and activity of tyrosinase, the rate-limiting enzyme in melanogenesis, and reduced tyrosinase expression and activity in response to cAMP-inducing agents. Kazinol U reduced the expression of other melanogenic enzymes, such as tyrosinase-related protein (Tyrp) 1 and Tyrp2, and down-regulated microphthalmia-associated transcription factor (MITF), the master regulator of the tyrosinase gene family. Moreover, kazinol U induced phosphorylation of AMPK and MAPK proteins, which are MITF inhibitors. It also exhibited anti-melanogenic effects in zebrafish, a recently developed in vivo model. CONCLUSIONS AND IMPLICATIONS Our findings suggest that kazinol U reduces melanogenesis via its inhibitory effect on MITF and its downstream target genes, tyrosinase, Tyrp1 and Tyrp2. This work may provide a basis for the application of kazinol U for the treatment of hyperpigmentation skin disorders." @default.
• W2906610295 created "2019-01-01" @default.
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• W2906610295 date "2019-01-28" @default.
• W2906610295 modified "2023-10-12" @default.
• W2906610295 title "Kazinol U inhibits melanogenesis through the inhibition of tyrosinase‐related proteinsviaAMP kinase activation" @default.
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• W2906610295 doi "https://doi.org/10.1111/bph.14560" @default.
• W2906610295 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6365358" @default.
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