SPOP promotes tumorigenesis by acting as a key regulatory hub in kidney cancer.

Li G, Ci W, Karmakar S, Chen K, Dhar R, Fan Z, Guo Z, Zhang J, Ke Y, Wang L, Zhuang M, Hu S, Li X, Zhou L, Li X, Calabrese MF, Watson ER, Prasad SM, Rinker-Schaeffer C, Eggener SE, Stricker T, Tian Y, Schulman BA, Liu J, White KP
Cancer Cell. 2014 25 (4): 455-68

PMID: 24656772 · PMCID: PMC4443692 · DOI:10.1016/j.ccr.2014.02.007

Hypoxic stress and hypoxia-inducible factors (HIFs) play important roles in a wide range of tumors. We demonstrate that SPOP, which encodes an E3 ubiquitin ligase component, is a direct transcriptional target of HIFs in clear cell renal cell carcinoma (ccRCC). Furthermore, hypoxia results in cytoplasmic accumulation of SPOP, which is sufficient to induce tumorigenesis. This tumorigenic activity occurs through the ubiquitination and degradation of multiple regulators of cellular proliferation and apoptosis, including the tumor suppressor PTEN, ERK phosphatases, the proapoptotic molecule Daxx, and the Hedgehog pathway transcription factor Gli2. Knockdown of SPOP specifically kills ccRCC cells, indicating that it may be a promising therapeutic target. Collectively, our results indicate that SPOP serves as a regulatory hub to promote ccRCC tumorigenesis.

Copyright © 2014 Elsevier Inc. All rights reserved.

MeSH Terms (17)

Animals Carcinogenesis Carcinoma, Renal Cell Cell Transformation, Neoplastic Gene Knockdown Techniques HEK293 Cells Heterografts Humans Kidney Neoplasms Mice Mice, Inbred BALB C Mice, Nude Nuclear Proteins Repressor Proteins Signal Transduction Ubiquitin-Protein Ligases Ubiquitination

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