1. Hypoxia-inducible factor prolyl-4-hydroxylase-1 is a convergent point in the reciprocal negative regulation of NF-κB and p53 signaling pathways
- Author
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Ullah, K. (Karim), Rosendahl, A.-H. (Ann-Helen), Izzi, V. (Valerio), Bergmann, U. (Ulrich), Pihlajaniemi, T. (Taina), Mäki, J. M. (Joni M.), Myllyharju, J. (Johanna), Ullah, K. (Karim), Rosendahl, A.-H. (Ann-Helen), Izzi, V. (Valerio), Bergmann, U. (Ulrich), Pihlajaniemi, T. (Taina), Mäki, J. M. (Joni M.), and Myllyharju, J. (Johanna)
- Abstract
Hypoxia-inducible factor 1α (HIF1α) induces the expression of several hundred genes in hypoxia aiming at restoration of oxygen homeostasis. HIF prolyl-4-hydroxylases (HIF-P4Hs) regulate the stability of HIF1α in an oxygen-dependent manner. Hypoxia is a common feature in inflammation and cancer and the HIF pathway is closely linked with the inflammatory NF-κB and tumor suppressor p53 pathways. Here we show that genetic inactivation or chemical inhibition of HIF-P4H-1 leads to downregulation of proinflammatory genes, while proapoptotic genes are upregulated. HIF-P4H-1 inactivation reduces the inflammatory response under LPS stimulus in vitro and in an acute skin inflammation model in vivo. Furthermore, HIF-P4H-1 inactivation increases p53 activity and stability and hydroxylation of proline 142 in p53 has an important role in this regulation. Altogether, our data suggest that HIF-P4H-1 inhibition may be a promising therapeutic candidate for inflammatory diseases and cancer, enhancing the reciprocal negative regulation of the NF-κB and p53 pathways.
- Published
- 2017