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Tumor progression is a multistep process in which proproliferation mutations must be accompanied by suppression of senescence. In melanoma, proproliferative signals are provided by activating mutations in NRAS and BRAF, whereas senescence is bypassed by inactivation of the p16(Ink4a) gene. Melanomas also frequently exhibit constitutive activation of the Wnt/beta-catenin pathway that is presumed to induce proliferation, as it does in carcinomas. We show here that, contrary to expectations, stabilized beta-catenin reduces the number of melanoblasts in vivo and immortalizes primary skin melanocytes by silencing the p16(Ink4a) promoter. Significantly, in a novel mouse model for melanoma, stabilized beta-catenin bypasses the requirement for p16(Ink4a) mutations and, together with an activated N-Ras oncogene, leads to melanoma with high penetrance and short latency. The results reveal that synergy between the Wnt and mitogen-activated protein (MAP) kinase pathways may represent an important mechanism underpinning the genesis of melanoma, a highly aggressive and increasingly common disease.

Original publication

DOI

10.1101/gad.450107

Type

Journal article

Journal

Genes Dev

Publication Date

15/11/2007

Volume

21

Pages

2923 - 2935

Keywords

Animals, Cell Line, Transformed, Cell Transformation, Neoplastic, Cells, Cultured, Chromatin Immunoprecipitation, Crosses, Genetic, Cyclin-Dependent Kinase Inhibitor p16, Electrophoretic Mobility Shift Assay, Gene Silencing, Genes, ras, Humans, Luciferases, Melanocytes, Melanoma, Mice, Mice, Transgenic, Transfection, beta Catenin, beta-Galactosidase