Abstract
The effect of retinoic acid on murine B16 melanoma cell growth, tyrosinase activity and melanin synthesis was investigated. Retinoic acid inhibited the growth of B16F1, B16F10 and B16BL6 melanoma cells, but enhanced melanin synthesis only in the B16F1 cells. The B16F10 and B16BL6 cells exhibited retinoic acid-induced suppression of tyrosinase activity and melanin synthesis, which was most apparent in the B16F10 cell variant. For comparison, Cloudman S91 melanoma cells proved to be particularly sensitive to retinoic acid-induced growth inhibition and stimulation of the expression of their melanotic phenotype. These results suggest considerable heterogeneity in the B16 melanoma with respect to their response to retinoic acid.
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