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Learn MoreClear cell renal cell carcinoma (ccRCC) is characterized by a loss of tumor suppressor Von Hippel Lindau (VHL) function, which leads to accumulation of hypoxia inducible factor (including HIF1 and HIF2). HIF2 was previously reported to be one of the major oncogenic drivers in ccRCC, however its therapeutic targeting remains challenging. Here we performed a deubiquitinase (DUB) cDNA library binding screen and discovered that USP37 is a DUB that binds HIF2 and promotes HIF2 deubiquitination. As a result, USP37 promotes HIF2 protein stability in an enzymatically dependent manner and depletion of USP37 leads to HIF2 downregulation in ccRCC. Functionally, USP37 depletion causes decreased cell proliferation measured by MTS, 2-D colony formation as well as 3-D anchorage independent growth. USP37 is also essential for maintaining kidney tumorigenesis in an orthotopic xenograft model and its depletion leads to decreased primary kidney tumorigenesis and spontaneous lung metastasis. Our results suggest that USP37 is a potential new therapeutic target in ccRCC. SOURCE: Jeremy Simon (jeremy_simon@med.unc.edu) - UNC Chapel Hill
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