Abstract
SPROUTY2 (SPRY2) is an intracellular regulator of receptor tyrosine kinase signaling involved in cell growth, differentiation and tumorigenesis. Here, we show that SPRY2 is a target gene of the Wnt/β-catenin pathway that is abnormally activated in more than 90% of colon carcinomas. In human colon cancer cells, SPRY2 expression is induced by β-catenin in co-operation with the transcription factor FOXO3a instead of lymphoid enhancer factor/T-cell factor proteins. We found binding of β-catenin to the SPRY2 promoter at FOXO3a response elements. In vivo, cells marked by nuclear β-catenin and FOXO3a express SPRY2 in proliferative epithelial tissues, such as intestinal mucosa and epidermis. Consistently, inducible β-catenin deletion in mice reduced Spry2 expression in the small intestine. Moreover, SPRY2 protein expression correlated with nuclear β-catenin and FOXO3a colocalization in human colon carcinomas. Importantly, the amount of SPRY2 protein correlated with shorter overall survival of colon cancer patients. Our data reveal SPRY2 as a novel Wnt/β-catenin and FOXO3a target gene indicative of poor prognosis in colon cancer.
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Acknowledgements
We thank T Martínez for technical assistance and Hans Clevers for providing the LS174T-tetOn-ΔNTCF4 cells. Experiments were supported by grants from Fondo Europeo de Desarrollo Regional-Instituto de Salud Carlos III and Spanish Cooperative Research Network on Cancer (RTICC) (FIS-PI081356, RD12/0036/0001, RD12/0036/0021 and RD12/0036/0012), Plan Nacional de Biomedicina, Ministerio de Economía y Competitividad (SAF-18302) and Comunidad de Madrid (S2010/BMD-2344 Colomics2). HGP was supported by the Miguel Servet Program, Instituto de Salud Carlos III (ISCIII) and PO-M by an EMBO research fellowship.
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Ordóñez-Morán, P., Irmisch, A., Barbáchano, A. et al. SPROUTY2 is a β-catenin and FOXO3a target gene indicative of poor prognosis in colon cancer. Oncogene 33, 1975–1985 (2014). https://doi.org/10.1038/onc.2013.140
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DOI: https://doi.org/10.1038/onc.2013.140
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