High-Frequency Canonical Wnt Activation in Multiple Sarcoma Subtypes Drives Proliferation through a TCF/β-Catenin Target Gene, CDC25A

SummaryWnt canonical signaling is critical for normal development as well as homeostasis of several epithelial tissues, and constitutive activation of this pathway is commonly observed in carcinomas. We show here that 50% of human sarcomas (n = 45) and 65% of sarcoma cell lines (n = 23) of diverse histological subtypes exhibit upregulated autocrine canonical Wnt signaling. Furthermore, in Wnt autocrine cell lines, we identify alterations including overexpression or gene amplification of Wnt ligands and/or LRP5/6 coreceptors and epigenetic silencing of different cell surface Wnt antagonists. Mutations in adenomatous polyposis coli (APC) gene were observed in two nonautocrine Wnt-positive sarcoma cell lines. Finally, downregulation of the activated Wnt pathway inhibited sarcoma cell proliferation both in vitro and in vivo by a mechanism involving the downregulation of CDC25A.

► Upregulated canonical Wnt signaling in human sarcomas ► Autocrine activation of the Wnt canonical pathway in sarcomas ► Wnt-induced sarcoma cell proliferation is mediated through CDC25A ► CDC25A is a TCF/β-catenin target gene in hMSCs and sarcoma cells