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Queensland Cancer Fund Research Laboratories, Queensland Institute of Medical Research, Joint Experimental Oncology Program, University of Queensland, Brisbane, Queensland 4029, Australia
The loss of the tumor suppressor gene product p16 in melanoma is well documented, although the normal physiological function of p16 in skin melanocytes is unknown. In this report, we demonstrate that when human skin was irradiated with suberythemal doses of UV radiation, levels of p16 were dramatically increased by 16 h postirradiation, peaking at 24 h, and declining by 72 h. p16 was expressed in the nucleus and cytoplasm of melanocytes and keratinocytes within the epidermis, and the pattern of p16 expression within the epidermis was dependent on the penetrative ability of the different UV wavebands. The existence of a UV-induced response pathway involving up-regulated p16 expression may provide a mechanism linking the loss of p16 and UV exposure with the development of melanoma.
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