C-terminal binding protein-2 regulates response of epithelial ovarian cancer cells to histone deacetylase inhibitors.

Abstract	Ovarian cancer survival rates have stagnated in the last 20 years despite the development of novel chemotherapeutic agents. Modulators of gene expression, such as histone deacetylase (HDAC) inhibitors, are among the new agents being used in clinical trials. Predictors of sensitivity to chemotherapy have remained elusive. In this study, we show that the expression of the transcriptional corepressor C-terminal binding protein-2 (CtBP2) is elevated in human ovarian tumors. Downregulation of CtBP2 expression in ovarian cancer cell lines using short-hairpin RNA strategy suppressed the growth rate and migration of the resultant cancer cells. The knockdown cell lines also showed upregulation of HDAC activity and increased sensitivity to selected HDAC inhibitors. Conversely, forced expression of wild-type CtBP2 in the knockdown cell lines reversed HDAC activity and partially rescued cellular sensitivity to the HDAC inhibitors. We propose that CtBP2 is an ovarian cancer oncogene that regulates gene expression program by modulating HDAC activity. CtBP2 expression may be a surrogate indicator of cellular sensitivity to HDAC inhibitors.
Authors	L Barroilhet, J Yang, K Hasselblatt, R M Paranal, S-K Ng, J A Rauh-Hain, W R Welch, J E Bradner, R S Berkowitz, S-W Ng
Journal	Oncogene (Oncogene) Vol. 32 Issue 33 Pg. 3896-903 (Aug 15 2013) ISSN: 1476-5594 [Electronic] England
PMID	22945647 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	Antineoplastic Agents Co-Repressor Proteins Histone Deacetylase Inhibitors Nerve Tissue Proteins Alcohol Oxidoreductases CTBP2 protein, human Histone Deacetylases
Topics	Alcohol Oxidoreductases (genetics, metabolism) Antineoplastic Agents (pharmacology) Blotting, Western Carcinoma, Ovarian Epithelial Co-Repressor Proteins Drug Resistance, Neoplasm (physiology) Female Gene Expression Regulation, Neoplastic (physiology) Gene Knockdown Techniques Histone Deacetylase Inhibitors (pharmacology) Histone Deacetylases (genetics, metabolism) Humans Immunohistochemistry Neoplasms, Glandular and Epithelial (genetics, metabolism) Nerve Tissue Proteins (genetics, metabolism) Oncogenes Ovarian Neoplasms (genetics, metabolism)

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