Transcriptional upregulation of histone deacetylase 2 promotes Myc-induced oncogenic effects

Marshall, G.M. et al. (2010) Transcriptional upregulation of histone deacetylase 2 promotes Myc-induced oncogenic effects. Oncogene, 29(44), pp. 5957-5968. (doi:10.1038/onc.2010.332) (PMID:20697349)

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Abstract

Myc oncoproteins and histone deacetylases (HDACs) modulate gene transcription and enhance cancer cell proliferation, and HDAC inhibitors are among the most promising new classes of anticancer drugs. Here, we show that N-Myc and c-Myc upregulated HDAC2 gene expression in neuroblastoma and pancreatic cancer cells, respectively, which contributed to N-Myc- and c-Myc-induced cell proliferation. Cyclin G2 (CCNG2) was commonly repressed by N-Myc and HDAC2 in neuroblastoma cells and by c-Myc and HDAC2 in pancreatic cancer cells, and could be reactivated by HDAC inhibitors. 5-bromo-2′-deoxyuridine incorporation assays showed that transcriptional repression of CCNG2 was, in part, responsible for N-Myc-, c-Myc- and HDAC2-induced cell proliferation. Dual crosslinking chromatin immunoprecipitation assay demonstrated that N-Myc acted as a transrepressor by recruiting the HDAC2 protein to Sp1-binding sites at the CCNG2 gene core promoter. Moreover, HDAC2 was upregulated, and CCNG2 downregulated, in pre-cancerous and neuroblastoma tissues from N-Myc transgenic mice, and c-Myc overexpression correlated with upregulation of HDAC2 and repression of CCNG2 in tumour tissues from pancreatic cancer patients. Taken together, our data indicate the critical roles of upregulation of HDAC2 and suppression of CCNG2 in Myc-induced oncogenesis, and have significant implications for the application of HDAC inhibitors in the prevention and treatment of Myc-driven cancers.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Biankin, Professor Andrew and Chang, Dr David
Authors: Marshall, G.M., Gherardi, S., Xu, N., Neiron, Z., Trahair, T., Scarlett, C.J., Chang, D.K., Liu, P.Y., Jankowski, K., Iraci, N., Haber, M., Norris, M.D., Keating, J., Sekyere, E., Jonquieres, G., Stossi, F., Katzenellenbogen, B.S., Biankin, A.V., Perini, G., and Liu, T.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cancer Sciences
Journal Name:Oncogene
Publisher:Nature Publishing Group
ISSN:0950-9232
ISSN (Online):1476-5594
Published Online:09 August 2010

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