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BAG-1 interacts with the p50–p50 homodimeric NF-?B complex: implications for colorectal carcinogenesis

Southern, S.L., Collard, T. J., Urban, B. C., Skeen, V. R., Smartt, H. J., Hague, A., Oakley, F., Townsend, P. A., Perkins, N. D., Paraskeva, C. and Williams, A. C. (2012) BAG-1 interacts with the p50–p50 homodimeric NF-?B complex: implications for colorectal carcinogenesis Oncogene, 31, (22), pp. 2761-2772. (doi:10.1038/onc.2011.452).

Record type: Article

Abstract

Understanding the mechanisms that promote aberrant tumour cell survival is critical for the determination of novel strategies to combat colorectal cancer (CRC). We have recently shown that the anti-apoptotic protein BAG-1, highly expressed in pre-malignant and CRC tissue, can potentiate cell survival through regulating NF-?B transcriptional activity. In this study, we identify a novel complex between BAG-1 and the p50–p50 NF-?B homodimers, implicating BAG-1 as a co-regulator of an atypical NF-?B pathway. Importantly, the BAG-1-p50 complex was detected at gene regulatory sequences including the epidermal growth factor receptor (EGFR) and COX-2 (PTGS2) genes. Suppression of BAG-1 expression using small interfering RNA was shown to increase EGFR and suppress COX-2 expression in CRC cells. Furthermore, mouse embryonic fibroblasts derived from the NF-?B1 (p105/p50) knock-out mouse were used to demonstrate that p50 expression was required for BAG-1 to suppress EGFR expression. This was shown to be functionally relevant as attenuation of BAG-1 expression increased ligand activated phosphorylation of EGFR in CRC cells. In summary, this paper identifies a novel role for BAG-1 in modulating gene expression through interaction with the p50–p50 NF-?B complexes. Data presented led us to propose that BAG-1 can act as a selective regulator of p50–p50 NF-?B responsive genes in colorectal tumour cells, potentially important for the promotion of cell survival in the context of the fluctuating tumour microenvironment. As BAG-1 expression is increased in the developing adenoma through to metastatic lesions, understanding the function of the BAG-1-p50 NF-?B complexes may aid in identifying strategies for both the prevention and treatment of CRC.

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Accepted/In Press date: 3 October 2011
Published date: 31 May 2012
Organisations: Cancer Sciences

Identifiers

Local EPrints ID: 202467
URI: http://eprints.soton.ac.uk/id/eprint/202467
ISSN: 0950-9232
PURE UUID: 7a3de64a-f821-45fd-a36c-6ee7d7b4a93d

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Date deposited: 08 Nov 2011 15:05
Last modified: 18 Jul 2017 11:10

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Contributors

Author: S.L. Southern
Author: T. J. Collard
Author: B. C. Urban
Author: V. R. Skeen
Author: H. J. Smartt
Author: A. Hague
Author: F. Oakley
Author: P. A. Townsend
Author: N. D. Perkins
Author: C. Paraskeva
Author: A. C. Williams

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