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2016 ; 11
(4
): e0153718
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PBRM1 Regulates the Expression of Genes Involved in Metabolism and Cell Adhesion
in Renal Clear Cell Carcinoma
#MMPMID27100670
Chowdhury B
; Porter EG
; Stewart JC
; Ferreira CR
; Schipma MJ
; Dykhuizen EC
PLoS One
2016[]; 11
(4
): e0153718
PMID27100670
show ga
Polybromo-1 (PBRM1) is a component of the PBAF (Polybromo-associated-BRG1- or
BRM-associated factors) chromatin remodeling complex and is the second most
frequently mutated gene in clear-cell renal cell Carcinoma (ccRCC). Mutation of
PBRM1 is believed to be an early event in carcinogenesis, however its function as
a tumor suppressor is not understood. In this study, we have employed Next
Generation Sequencing to profile the differentially expressed genes upon PBRM1
re-expression in a cellular model of ccRCC. PBRM1 re-expression led to
upregulation of genes involved in cellular adhesion, carbohydrate metabolism,
apoptotic process and response to hypoxia, and a downregulation of genes involved
in different stages of cell division. The decrease in cellular proliferation upon
PBRM1 re-expression was confirmed, validating the functional role of PBRM1 as a
tumor suppressor in a cell-based model. In addition, we identified a role for
PBRM1 in regulating metabolic pathways known to be important for driving ccRCC,
including the regulation of hypoxia response genes, PI3K signaling, glucose
uptake, and cholesterol homeostasis. Of particular novelty is the identification
of cell adhesion as a major downstream process uniquely regulated by PBRM1
expression. Cytoskeletal reorganization was induced upon PBRM1 reexpression as
evidenced from the increase in the number of cells displaying cortical actin, a
hallmark of epithelial cells. Genes involved in cell adhesion featured
prominently in our transcriptional dataset and overlapped with genes uniquely
regulated by PBRM1 in clinical specimens of ccRCC. Genes involved in cell
adhesion serve as tumor suppressor and maybe involved in inhibiting cell
migration. Here we report for the first time genes linked to cell adhesion serve
as downstream targets of PBRM1, and hope to lay the foundation of future studies
focusing on the role of chromatin remodelers in bringing about these alterations
during malignancies.