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• W1639637038 abstract "The dramatic rise in incidence of malignant melanoma experienced by populations both within the United States and throughout the world over the last several decades has been attributed to enhanced exposure to the UV spectrum of sunlight radiation. This hypothesis can now be tested using genetically engineered mouse models predisposed to malignant melanoma. Here we use melanoma-prone transgenic mice inappropriately expressing hepatocyte growth factor/scatter factor (HGF/SF) in the skin as an experimental model system to ascertain the consequences of a chronic regimen of suberythemal UV radiation on melanoma genesis. HGF/SF is a multifunctional regulator capable of stimulating growth, motility, invasiveness, and morphogenetic transformation in cells, including melanocytes, expressing its receptor tyrosine kinase Met. HGF/SF transgenic mice demonstrate ectopic interfollicular localization and accumulation of melanocytes within the truncal dermis, epidermis, and junction and if untreated develop primary cutaneous melanoma with a mean onset age of approximately 21 months. Transgenic mice and their wild-type littermates subjected to UV radiation three times weekly using FS40 sunlamps (60% UVB and 40% UVA), with daily UV doses graded from 2.25 to 6.0 kJ/m2, developed skin tumors with a mean onset age of 26 and 37 weeks, respectively (P < 0.001, Kaplan-Meier log rank test). However, the repeated doses of suberythemal UV radiation used in this study failed to accelerate melanoma genesis, instead inducing the development of nonmelanoma tumors that included squamous cell carcinomas, squamous papillomas, and sarcomas. The conspicuous absence of melanocytic tumors occurred despite the immunohistochemical detection of a significant stimulation (P < 0.001) in melanocyte-specific bromodeoxyuridine incorporation in response to only 2 weeks of UV irradiation (total UV dose of 13.5 kJ/m2), resulting in 2.6- and 4.6-fold increases in the number of melanocytes in the dermis and epidermis, respectively. These data indicate that chronic suberythemal UV radiation preferentially favors the development of nonmelanocytic over melanocytic neoplasms in this transgenic animal, consistent with the pathogenesis proposed for sun exposure-associated skin cancer based on retrospective studies in the human population. Our findings suggest that the HGF/SF transgenic mouse will be useful as an experimental model for determining the consequences of exposure to various regimens of UV radiation and for elucidating the mechanisms by which such consequences are realized." @default.
• W1639637038 created "2016-06-24" @default.
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• W1639637038 date "2000-07-15" @default.
• W1639637038 modified "2023-09-23" @default.
• W1639637038 title "Accelerated ultraviolet radiation-induced carcinogenesis in hepatocyte growth factor/scatter factor transgenic mice." @default.
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