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• W2741781335 abstract "Enhancer of zeste homolog 2 (EZH2) is a key component of the polycomb repressive complex 2 (PRC2). EZH2 is frequently overexpressed in a wide variety of human malignancies including non-Hodgkin lymphoma, gastric cancer, pancreatic cancer, and lung cancer. Thus it has potential to become a therapeutic target. Characterization of EZH2 as a therapeutic target in clear cell renal cell carcinoma (ccRCC) has not been fully explored. ccRCC have been defined by mutation of the von Hippel-Lindau (VHL) tumor suppressor gene in combination with chromosome 3p loss. Recent sequencing efforts have revealed that several chromatin remodeling genes encoded on chromosome 3p are often mutated, of which PBRM1 is the most frequent (41%). The PBRM1 gene codes for the BAF180 protein, a SWI/SNF chromatin remodeling complex subunit. Loss of BAF180 in ccRCC may disrupt the PBAF variant of the SWI/SNF complex. The SWI/SNF complex remodels the chromatin landscape by either sliding or evicting the nucleosomes from the chromatin. This chromatin remodeling modulates the accessibility to promoter regions by transcriptional machinery. It is through this mechanism that the SWI/SNF complex can regulate a range of cellular processes. It has been demonstrated that the SWI/SNF complex can act antagonistically to the PRC2 complex by evicting PRC2 complex from the promoters of tumor suppressors. Disruption of the SWI/SNF complex would impede the eviction of the PRC2 complex, similarly observed in SNF5-deficient malignant rhabdoid tumors. Therefore, we hypothesize that PBRM1 inactivation disrupts specific SWI/SNF complexes allowing EZH2 to bind and repress target tumor suppressor genes. Thus inhibition of EZH2 in ccRCC may present as a targeted therapeutic option in tumors with PBRM1 mutations. We have investigated EZH2 in ccRCC cell lines with PBRM1 mutations and observed that these cells lines have overexpression of EZH2 in comparison to RPTEC (renal cortex proximal tubule epithelium cell line). We examined the effects of two EZH2 inhibitors (GSK126 and EPZ6438) on ccRCC tumor spheroids. Our preliminary data suggests EZH2 inhibition results in reduced growth of PBRM1 mutant cell lines grown as tumor spheroids. Citation Format: Darmood Wei, Youfeng Yang, Christopher J. Ricketts, Carole Sourbier, Laura S. Schmidt, William M. Linehan. Using tumor spheroids to evaluate the efficacy of EZH2 inhibitors in clear cell renal cell carcinoma (ccRCC) [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 1400. doi:10.1158/1538-7445.AM2017-1400" @default.
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• W2741781335 date "2017-07-01" @default.
• W2741781335 modified "2023-09-27" @default.
• W2741781335 title "Abstract 1400: Using tumor spheroids to evaluate the efficacy of EZH2 inhibitors in clear cell renal cell carcinoma (ccRCC)" @default.
• W2741781335 doi "https://doi.org/10.1158/1538-7445.am2017-1400" @default.
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