Reactive oxygen species attenuate nitric-oxide-mediated hypoxia-inducible factor-1alpha stabilization

Free Radical Biology & Medicine
Roman KöhlBernhard Brüne

Abstract

Tissue hypoxia/ischemia are major pathophysiological determinants. Conditions of decreased oxygen availability provoke accumulation and activation of hypoxia-inducible factor-1 (HIF-1). Recent reports demonstrate a crucial role of HIF-1 for inflammatory events. Regulation of hypoxic responses by the inflammatory mediators nitric oxide (NO) and reactive oxygen species (ROS) is believed to be of pathophysiolgical relevance. It is reported that hypoxic stabilization of HIF-1alpha can be antagonized by NO due to its ability to attenuate mitochondrial electron transport. Likely, the formation of ROS could contribute to this effect. As conflicting results emerged from several studies showing either decreased or increased ROS production during hypoxia, we used experiments mimicking hypoxic intracellular ROS changes by using the redox cycling agent 2,3-dimethoxy-1,4-naphthoquinone (DMNQ), which generates superoxide inside cells. Treatment of A549, HEK293, HepG2, and COS cells with DMNQ resulted in a concentration-dependent raise in ROS which correlated with HIF-1alpha accumulation. By using a HIF-1alpha-von Hippel-Lindau tumor suppressor protein binding assay, we show that ROS produced by DMNQ impaired prolyl hydroxylase activity. When...Continue Reading

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