Abstract
Intratumoral hypoxia, a frequent finding in metastatic cancer, results in the activation of hypoxia-inducible factors (HIFs). HIFs are implicated in many steps of breast cancer metastasis, including metastatic niche formation through increased expression of lysyl oxidase (LOX) and lysyl oxidase-like (LOXL) proteins, enzymes that remodel collagen at the metastatic site and recruit bone marrow-derived cells (BMDCs) to the metastatic niche. We investigated the effect of two chemically and mechanistically distinct HIF inhibitors, digoxin and acriflavine, on breast cancer metastatic niche formation. Both drugs blocked the hypoxia-induced expression of LOX and LOXL proteins, collagen cross-linking, CD11b+ BMDC recruitment, and lung metastasis in an orthotopic breast cancer model. Patients with HIF-1α-overexpressing breast cancers are at increased risk of metastasis and mortality and our results suggest that such patients may benefit from aggressive therapy that includes a HIF inhibitor.
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Acknowledgments
We thank Karen Padgett (Novus Biologicals) for providing antibodies against LOXL2, LOXL4, and CD11b; and Rashmi Bankoti and Sergio Rey for advice. This work was supported by grants from the Emerald Foundation and National Cancer Institute (U54-CA143868) and funds from the Johns Hopkins Institute for Cell Engineering.
Disclosure statement
G.L.S. is the C. Michael Armstrong Professor at Johns Hopkins University School of Medicine and an American Cancer Society Research Professor. C.C.W. is a Croucher Foundation Fellow. All authors confirm that there is no conflict of interest associated with this publication.
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Wong, C.CL., Zhang, H., Gilkes, D.M. et al. Inhibitors of hypoxia-inducible factor 1 block breast cancer metastatic niche formation and lung metastasis. J Mol Med 90, 803–815 (2012). https://doi.org/10.1007/s00109-011-0855-y
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DOI: https://doi.org/10.1007/s00109-011-0855-y