Blockade of Hypoxia: The Impact on Tumor Growth in an Experimental Tumor Model

Document Type : Original Article

Authors

1 Department of Medical Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.

2 Department of Tissue Engineering and Applied Cell Sciences, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran.

Abstract

Background: Tumor microenvironment is an active factor participating in immunoregulation, thereby preventing immunosurveillance and limiting the efficacy of anticancer therapies. Hypoxia as a major characteristic of solid tumors causes the expression of Hypoxia-Inducible Factor-1α (HIF-1α). This is a transcription factor that mediates hypoxic responses of tumor cells and involves in the expression of tumor immunosuppression-related genes.
Materials and Methods: In this study, we used a mouse 4T1 breast cancer model.
Results: Our obtained data revealed that in vivo administration of PX-478, an inhibitor of oxygen sensitive HIF-1α, reduced the expression of Forkhead box P3 (Foxp3) transcript, a molecule that is directly controlled by HIF-1. The level of vascular endothelial growth factor, another gene controlled by HIF-1, remained unchanged. The observed results were in correlation with delayed tumor growth in tumor-bearing mice.
Conclusion: Our findings indicate that the reduction in Foxp3 expression through HIF-1α inhibition using PX-478 may contribute to tumor regression.

Keywords

References

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Immunoregulation
Volume 2, Issue 1 - Serial Number 3
Summer & Autumn
July 2019
Pages 35-40

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