期刊
CANCER RESEARCH
卷 70, 期 21, 页码 8526-8536出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-10-1563
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资金
- Netherlands Science Organization (NWO)
- Dutch Cancer Society (KWF Kankerbestrijding)
- Center for Biomedical Genetics
- Cancer Genomics Center
- Cancer Research UK [Ref C107/A10433]
- Harry J Lloyd Charitable Trust
Oncogene-induced senescence (OIS) is a potent tumor-suppressive mechanism that is thought to come at the cost of aging. The Forkhead box O (FOXO) transcription factors are regulators of life span and tumor suppression. However, whether and how FOXOs function in OIS have been unclear. Here, we show a role for FOXO4 in mediating senescence by the human BRAF(V600E) oncogene, which arises commonly in melanoma. BRAF(V600E) signaling through mitogen-activated protein kinase/extracellular signal-regulated kinase kinase resulted in increased reactive oxygen species levels and c-Jun NH2 terminal kinase-mediated activation of FOXO4 via its phosphorylation on Thr(223), Ser(226), Thr(447), and Thr(451). BRAF(V600E)-induced FOXO4 phosphorylation resulted in p21(cip1)-mediated cell senescence independent of p16(ink4a) or p27(kip1). Importantly, melanocyte-specific activation of BRAFV600E in vivo resulted in the formation of skin nevi expressing Thr(223)/Ser(226)-phosphorylated FOXO4 and elevated p21(cip1). Together, these findings support a model in which FOXOs mediate a trade-off between cancer and aging. Cancer Res; 70(21); 8526-36. (C)2010 AACR.
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