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Mannosylerythritol Lipid Is a Potent Inducer of Apoptosis and Differentiation of Mouse Melanoma Cells in Culture¹

Tsukuba Life Science Center, RIKEN (The Institute of Physical & Chemical Research), Tsukuba, Ibaraki 305-0074 [X. Z., Y. W., M. S., C. G., T. M., K. K. Y.], and Institute of Applied Biochemistry, University of Tsukuba, Tsukuba, Ibaraki 305-0006 [X. Z., Y. W., M. S., N. N., T. N.], Japan

Malignant melanomas are tumors that are well known to respond poorly to treatment with chemotherapeutic reagents. We report here that mannosylerythritol lipid (MEL), an extracellular glycolipid from yeast, markedly inhibited the growth of mouse melanoma B16 cells in a dose-dependent manner. Exposure of B16 cells to MEL at 10 µM and higher concentrations caused the condensation of chromatin, DNA fragmentation, and sub-G₁ arrest, all of which are hallmarks of cells that are undergoing apoptosis. Analysis of the cell cycle also suggested that both the MEL-mediated inhibition of growth and apoptosis were closely associated with growth arrest in the G₁ phase. Moreover, MEL exposure stimulated the expression of differentiation markers of melanoma cells, such as tyrosinase activity and the enhanced production of melanin, which is an indication that MEL triggered both apoptotic and cell differentiation programs. Forced expression of Bcl-2 protein in stably transformed B16 cells had a dual effect: it interfered with MEL-induced apoptosis but increased both tyrosinase activity and the production of melanin as compared with these phenomena in vector-transfected MEL-treated control B16 cells. These results provide the first evidence that growth arrest, apoptosis, and the differentiation of mouse malignant melanoma cells can be induced by a microbial extracellular glycolipid.

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