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Article

SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma

  • Authors:
    • Wencai Zhao
    • Jiancheng Zhou
    • Zhuo Deng
    • Yang Gao
    • Yongyi Cheng
  • View Affiliations / Copyright

    Affiliations: Department of Urology, Shaanxi Provincal People's Hospital, Xi'an, Shaanxi 710068, P.R. China, Department of Gynecology, Shaanxi Provincal People's Hospital, Xi'an, Shaanxi 710068, P.R. China
  • Pages: 1001-1008
    |
    Published online on: July 6, 2016
       https://doi.org/10.3892/ijo.2016.3609
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Abstract

Renal cell carcinoma (RCC) is the most common type of kidney cancer, about one third of the cases are diagnosed at advanced stages with metastases and effective treatments for metastatic RCC are lacking. The molecular events supporting RCC progression remain poorly understood. SPOP, an E3 ubiquitin ligase component, was recently showed to sufficiently promote RCC tumorigenesis, however, other potential functions of SPOP in RCC have not been studied. In the present investigation, by assessing the immunohistochemical staining of SPOP in urological tumors, we found the protein was highly expressed in RCC, in particular, it was specifically expressed in clear cell RCC. cDNA microarray data showed that SPOP mRNA level was significantly increased in clear cell RCC compared to normal kidney tissues, which might be the result of the abnormal DNA copy number of this gene. More interestingly, SPOP was positive in tumors with local invasion or metastasis, and it was associated with tumor recurrence-free survival of clear cell RCC patients. Further in vitro assays demonstrated that SPOP drove RCC epithelial-mesenchymal transition (EMT) and promoted cell invasion. Mechanistically, SPOP enhanced β-catenin protein expression as well as its nuclear translocation, and elevated TCF4 expression. Both β-catenin and TCF4 upregulated the critical EMT-inducing transcription factor ZEB1, which functioned as an effector of β-catenin/TCF4 signaling in RCC invasion. These data identified SPOP as a new marker and prognostic factor for clear cell RCC, and its functions provide new insight into the molecular mechanisms of RCC progression, in which SPOP appears to be an EMT activator.
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Copy and paste a formatted citation
Spandidos Publications style
Zhao W, Zhou J, Deng Z, Gao Y and Cheng Y: SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma. Int J Oncol 49: 1001-1008, 2016.
APA
Zhao, W., Zhou, J., Deng, Z., Gao, Y., & Cheng, Y. (2016). SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma. International Journal of Oncology, 49, 1001-1008. https://doi.org/10.3892/ijo.2016.3609
MLA
Zhao, W., Zhou, J., Deng, Z., Gao, Y., Cheng, Y."SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma". International Journal of Oncology 49.3 (2016): 1001-1008.
Chicago
Zhao, W., Zhou, J., Deng, Z., Gao, Y., Cheng, Y."SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma". International Journal of Oncology 49, no. 3 (2016): 1001-1008. https://doi.org/10.3892/ijo.2016.3609
Copy and paste a formatted citation
x
Spandidos Publications style
Zhao W, Zhou J, Deng Z, Gao Y and Cheng Y: SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma. Int J Oncol 49: 1001-1008, 2016.
APA
Zhao, W., Zhou, J., Deng, Z., Gao, Y., & Cheng, Y. (2016). SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma. International Journal of Oncology, 49, 1001-1008. https://doi.org/10.3892/ijo.2016.3609
MLA
Zhao, W., Zhou, J., Deng, Z., Gao, Y., Cheng, Y."SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma". International Journal of Oncology 49.3 (2016): 1001-1008.
Chicago
Zhao, W., Zhou, J., Deng, Z., Gao, Y., Cheng, Y."SPOP promotes tumor progression via activation of β-catenin/TCF4 complex in clear cell renal cell carcinoma". International Journal of Oncology 49, no. 3 (2016): 1001-1008. https://doi.org/10.3892/ijo.2016.3609
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