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Selective silencing of the hypoxia-inducible factor 1 target gene BNIP3 by histone deacetylation and methylation in colorectal cancer

Oncogene volume 26, pages 132–141 (2007)Cite this article

Abstract

Hypoxia, via the hypoxia-inducible factors 1 and 2 (HIF-1 and HIF-2), upregulates many genes involved in cell survival. However, proapoptotic pathways are also induced. BCL-2/adenovirus E1B-19 kDa-interacting protein 3 (BNIP3) represents a paradigm of a cell death protein that is hypoxically upregulated via HIF-1 in most cancers. We found that in contrast to many other cell types, 6/8 colorectal cancer (CRC) cell lines show little hypoxic induction of BNIP3 despite an intact HIF signalling system. Colorectal tumour tissue also loses BNIP3 expression relative to matched normal samples. Downregulation of hypoxic BNIP3 in CRC cells was independent of the expression of other BCL-2 family members, or BNIP3L. That BNIP3 plays a functional role in hypoxic survival in CRC cells was demonstrated by the fact that CRC cell lines that do not upregulate BNIP3 or have been treated with BNIP3 RNA interference were insensitive to hypoxia-induced cell death. Promoter methylation and histone deacetylation were shown to silence BNIP3 in these CRC cell lines. Of significance, hypoxic induction of BNIP3 was restored in 4/6 cell lines by trichostatin-A treatment alone. These data suggest that BNIP3 plays an important role in hypoxic cell death and epigenetic mechanisms selectively silence its expression in CRC.

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  1. Laboratory of Molecular Oncology, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Cancer Research UK, Oxford, UK

    A L Bacon, S Fox, H Turley & A L Harris

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  1. A L Bacon
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  2. S Fox
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  3. H Turley
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  4. A L Harris
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Correspondence to A L Harris.

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Bacon, A., Fox, S., Turley, H. et al. Selective silencing of the hypoxia-inducible factor 1 target gene BNIP3 by histone deacetylation and methylation in colorectal cancer. Oncogene 26, 132–141 (2007). https://doi.org/10.1038/sj.onc.1209761

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