alexa The Quinoxaline Di-N-oxide DCQ Blocks Breast Cancer Metastasis In Vitro And In Vivo By Targeting The Hypoxia Inducible Factor-1 Pathway | 20046
ISSN: 2157-7552

Journal of Tissue Science & Engineering
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3rd International Conference on Tissue Science & Regenerative Medicine

Khaled Ghattass
Accepted Abstracts: J Tissue Sci Eng
DOI: 10.4172/2157-7552.S1.016
Abstract
Background: Although tumor hypoxia poses challenges against conventional cancer treatments, it provides a therapeutic target for hypoxia-activated drugs. Here, we studied the effect of the hypoxia-activated synthetic quinoxaline di-N-oxide DCQ against breast cancer metastasis and identified the underlying mechanisms. Methods: The human breast cancer cell lines MCF-7 (p53 wildtype) and MDA-MB-231 (p53 mutant) were treated with DCQ under normoxia or hypoxia. Drug toxicity on non-cancerous MCF-10A breast cells was also determined. In vitro cellular responses were investigated by flow cytometry, transfection, western blotting, ELISA and migration assays. The anti-metastatic effect of DCQ was validated in the MDA-MB-231 xenograft mouse model. Results: DCQ selectively induced apoptosis in both human breast cancer cells preferentially under hypoxia without affecting the viability of non-cancerous MCF-10A. Cancer cell death was associated with an increase in reactive oxygen species (ROS) independently of p53 and was inhibited by antioxidants. DCQ-induced ROS was associated with DNA damage, the downregulation of hypoxia inducible factor-1 alpha (HIF-1alpha), and inhibition of vascular endothelial growth factor (VEGF) secretion. In MCF-7, HIF-1alpha inhibition was partially via p53-activation and was accompanied by a decrease in p-mTOR protein, suggesting interference with HIF-1alpha translation. In MDA-MB-231, DCQ reduced HIF-1alpha through proteasomal-dependent degradation mechanisms. HIF-1alpha inhibition by DCQ blocked VEGF secretion and invasion in MCF-7 and led to the inhibition of TWIST in MDA-MB-231. Consistently, DCQ exhibited robust antitumor activity in MDA- MB-231 breast cancer mouse xenografts, enhanced animal survival, and reduced metastatic dissemination to lungs and liver. Conclusion: DCQ is the first hypoxia-activated drug showing anti-metastatic effects against breast cancer, suggesting its potential use for breast cancer therapy.
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