Article number 884
Malignant melanoma of the skin (CMM) is associated with ultraviolet radiation exposure, but the mechanisms and even the wavelengths responsible are unclear. Here we use a mammalian model to investigate melanoma formed in response to precise spectrally defined ultraviolet wavelengths and biologically relevant doses. We show that melanoma induction by ultraviolet A (320–400 nm) requires the presence of melanin pigment and is associated with oxidative DNA damage within melanocytes. In contrast, ultraviolet B radiation (280–320 nm) initiates melanoma in a pigment-independent manner associated with direct ultraviolet B DNA damage. Thus, we identified two ultraviolet wavelength-dependent pathways for the induction of CMM and describe an unexpected and significant role for melanin within the melanocyte in melanomagenesis.
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Noonan, F. P., Zaidi, M. R., Wolnicka-Glubisz, A., Anver, M. R., Bahn, J., Wielgus, A., et al. (2012). Melanoma induction by ultraviolet A but not ultraviolet B radiation requires melanin pigment. Nature Communications, 3, 884–. doi:10.1038/ncomms1893