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

Oncogene volume 31, pages 2761–2772 (2012)Cite this 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-κB transcriptional activity. In this study, we identify a novel complex between BAG-1 and the p50–p50 NF-κB homodimers, implicating BAG-1 as a co-regulator of an atypical NF-κB 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-κB1 (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-κB complexes. Data presented led us to propose that BAG-1 can act as a selective regulator of p50–p50 NF-κB 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-κB complexes may aid in identifying strategies for both the prevention and treatment of CRC.

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Acknowledgements

This work was funded by a Cancer Research UK programme grant, the Citrina Foundation, The Wellcome Trust and by the John James Bristol Foundation. We thank the Medical Research Council for providing an Infrastructure Award to establish the School of Medical Sciences Cell Imaging Facility at the University of Bristol.

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Authors and Affiliations

  1. School of Cellular & Molecular Medicine, University of Bristol, Bristol, UK

    S L Southern, T J Collard, B C Urban, V R Skeen, H J Smartt, C Paraskeva & A C Williams

  2. School of Oral & Dental Sciences, University of Bristol, Bristol, UK

    A Hague

  3. Institute for Cell and Molecular Biosciences (ICaMB), Medical School, Newcastle University, Newcastle upon Tyne, UK

    F Oakley & N D Perkins

  4. Division of Cancer Sciences, School of Medicine, Southampton General Hospital, University of Southampton, Southampton, UK

    P A Townsend

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  1. S L Southern
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Correspondence to A C Williams.

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Southern, S., Collard, T., Urban, B. et al. BAG-1 interacts with the p50–p50 homodimeric NF-κB complex: implications for colorectal carcinogenesis. Oncogene 31, 2761–2772 (2012). https://doi.org/10.1038/onc.2011.452

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