Abstract
Hypoxic regions within solid tumors are often resistant to chemotherapy and radiation. BNIP3 (Bcl-2/E1B 19 kDa interacting protein) is a proapoptotic member of the Bcl-2 family that is expressed in hypoxic regions of tumors. During hypoxia, BNIP3 expression is increased in many cell types and upon forced overexpression BNIP3 induces cell death. Herein, we have demonstrated that blockage of hypoxia-induced BNIP3 expression using antisense oligonucleotides against BNIP3 or blockage of BNIP3 function through expression of a mutant form of BNIP3 inhibits hypoxia-induced cell death in human embryonic kidney 293 cells. We have also determined that hypoxia-mediated BNIP3 expression is regulated by the transcription factor, hypoxia-inducible factor-1α (HIF-1α) in human epithelial cell lines. Furthermore, HIF-1α directly binds to a consensus HIF-1α-responsive element (HRE) in the human BNIP3 promoter that upon mutation of this HRE site eliminates the hypoxic responsiveness of the promoter. Since BNIP3 is expressed in hypoxic regions of tumors but fails to induce cell death, we determined whether growth factors block BNIP3-induced cell death. Treatment of the breast cancer cell line MCF-7 cells with epidermal growth factor (EGF) or insulin-like growth factor effectively protected these cells from BNIP3-induced cell death. Furthermore, inhibiting EGF receptor signaling using antibodies against ErbB2 (Herceptin) resulted in increased hypoxia-induced cell death in MCF-7 cells. Taken together, BNIP3 plays a role in hypoxia-induced cell death in human epithelial cells that could be circumvented by growth factor signaling.
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Acknowledgements
We dedicate this manuscript in the memory of Dr Arnold Greenberg who was a mentor and friend. Dr A Greenberg initiated the project in collaboration with Dr Gibson. This work is supported by Canadian Institutes of Health Research operating grant. L Kirshenbaum is a Canadian Research Chair in Molecular Cardiology. S Kothari is supported by a studentship from the Manitoba Health Research Council. J Cizeau is a recipient of the Shaw Communications/Lymphoma Society of Canada Post-doctoral Fellowship.
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Kothari, S., Cizeau, J., McMillan-Ward, E. et al. BNIP3 plays a role in hypoxic cell death in human epithelial cells that is inhibited by growth factors EGF and IGF. Oncogene 22, 4734–4744 (2003). https://doi.org/10.1038/sj.onc.1206666
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DOI: https://doi.org/10.1038/sj.onc.1206666
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