Anti-Melanogenic Property of Geoditin A in Murine B16 Melanoma CellsReportar como inadecuado

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School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China


Department of Medical Chemistry & Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, 833 S. Wood Street, Chicago, IL 60612, USA


Author to whom correspondence should be addressed.

Abstract Geoditin A, an isomalabaricane triterpene isolated from marine sponge Geodia japonica, has been demonstrated to induce apoptosis in leukemia HL60 cells and human colon HT29 cancer cells through an oxidative stress, a process also interfering with normal melanogenesis in pigment cells. Treatment of murine melanoma B16 cells with geoditin A decreased expression of melanogenic proteins and cell melanogenesis which was aggravated with adenylate cyclase inhibitor SQ22536, indicating melanogenic inhibition was mediated through a cAMP-dependent signaling pathway. Immunofluorescence microscopy and glycosylation studies revealed abnormal glycosylation patterns of melanogenic proteins tyrosinase and tyrosinase-related protein 1, and a co-localization of tyrosinase with calnexin CNX and lysosome-associated membrane protein 1 LAMP-1, implicating a post-translational modification in the ER and a degradation of tyrosinase in the lysosome. Taken together, potent anti-melanogenic property and the relatively low cytotoxicity of geoditin A have demonstrated its therapeutic potential as a skin lightening agent. View Full-Text

Keywords: geoditin A; B16 melanoma cells; melanogenesis; tyrosinase geoditin A; B16 melanoma cells; melanogenesis; tyrosinase

Autor: Florence W. K. Cheung 1, Jia Guo 1, Yick-Hin Ling 1, Chun-Tao Che 2 and Wing-Keung Liu 1,*



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