SPOP Promotes Tumorigenesis by Acting as a Key Regulatory Hub in Kidney Cancer

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• 作者：Guoqiang Li¹ ; ³ ; ¹⁶ ; Weimin Ci² ; ¹⁶ ; Subhradip Karmakar⁴ ; ⁵ ; ¹⁶ ; Ke Chen¹ ; Ruby Dhar⁴ ; ⁵ ; Zhixiang Fan⁹ ; Zhongqiang Guo¹ ; ¹⁰ ; Jing Zhang¹ ; Yuwen Ke¹ ; Lu Wang¹ ; ³ ; Min Zhuang¹² ; Shengdi Hu¹³ ; Xuesong Li¹⁰ ; Liqun Zhou¹⁰ ; Xianghong Li¹¹ ; Matthew F. Calabrese¹⁴ ; Edmond R. Watson¹⁴ ; Sandip M. Prasad⁷ ; Carrie Rinker-Schaeffer⁷ ; Scott E. Eggener⁷ ; Thomas Stricker⁴ ; ⁸ ; Yong Tian¹³ ; Brenda A. Schulman¹⁴ ; ¹⁵ ; Jiang Liu¹ ; ^{liuj@big.ac.cn" class="auth_mail} ; Kevin P. White⁴ ; ⁵ ; ⁶ ; ^{kpwhite@uchicago.edu" class="auth_mail}
• 刊名：Cancer Cell
• 出版年：14 April, 2014
• 年：2014
• 卷：25
• 期：4
• 页码：455-468
• 全文大小：4362 K

文摘

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Summary

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.