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Published in

Korean Society for Parasitology, Korean Journal of Parasitology, 5(60), p. 317-325, 2022

DOI: 10.3347/kjp.2022.60.5.317

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Hypoxia-Inducible Factor-1 Alpha Stabilization in Human Macrophages during Leishmania major Infection Is Impaired by Parasite Virulence

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Hypoxia-inducible factor-1 alpha (HIF-1α) is one of the master regulators of immune and metabolic cellular functions. HIF-1α, a transcriptional factor whose activity is closely related to oxygen levels, is a target for understanding infectious disease control. Several studies have demonstrated that HIF-1α plays an important role during the infectious process, while its role in relation to parasite virulence has not been addressed. In this work, we studied the expression levels of HIF-1α and related angiogenic vascular endothelial growth factor A (VEGF-A) in human macrophages infected with promastigotes of hypo- or hyper-virulent <i>Leishmania major</i> human isolates. <i>L. major</i> parasites readily subverted host macrophage functions for their survival and induced local oxygen consumption at the site of infection. In contrast to hypo-virulent parasites that induce high HIF-1α expression levels, hyper-virulent <i>L. major</i> reduced HIF-1α expression in macrophages under normoxic or hypoxic conditions, and consequently impeded the expression of VEGF-A mRNA. HIF-1α may play a key role during control of disease chronicity, severity, or outcome.