Abstract
The Wnt signaling pathway is involved in normal embryonic development and controls the homeostatic self-renewal of stem cells in adult tissues. Constitutive activation of Wnt signaling contributes to cancer development and progression. We identified a CXXC4 homozygous deletion at 4q24 in an aggressive renal cell carcinoma (RCC) using single-nucleotide polymorphism (SNP) arrays. CXXC4 encodes Idax, which negatively regulates Wnt signaling by binding to the PDZ domain of Dishevelled. CXXC4 mRNA levels in tumor samples were significantly lower in patients with metastases compared with those without (P=0.0016). Patients whose tumors had lower CXXC4 expression than normal kidney showed a poorer cause-specific survival outcome than those with higher expression (P=0.0095). Decreased expression of CXXC4 also correlated with cytoplasmic staining of β-catenin. Knockdown of CXXC4 induced the nuclear translocation of β-catenin and altered expression of a set of genes involved in cell proliferation, invasion and survival. Furthermore, reduced expression of CXXC4 by small interfering RNAs promoted cell proliferation and inhibited apoptosis after 5-FU and doxorubicin treatment in RCC cells. These data suggest that CXXC4 plays a critical role in tumor progression of RCC through Wnt signaling. Wnt signaling could thus be a potential molecular target in RCC indicating decreased CXXC4 expression.
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Acknowledgements
We thank Taeko Asano and Miyuki Katto for immunohistochemistry and microarray, respectively. We also thank Noriko Kunita for technical support. This study was performed in part as a collaborative research effort with the Clinical Informatics Research Initiative at the Organ Development Research Laboratory of the National Institute of Advanced Industrial Science and Technology (AIST), Japan.This study was supported by a grant from Scientific Research from the Japan Society for the Promotion of Science (JSPS), Japan.
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Kojima, T., Shimazui, T., Hinotsu, S. et al. Decreased expression of CXXC4 promotes a malignant phenotype in renal cell carcinoma by activating Wnt signaling. Oncogene 28, 297–305 (2009). https://doi.org/10.1038/onc.2008.391
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DOI: https://doi.org/10.1038/onc.2008.391
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