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J Biol Chem, Vol. 274, Issue 46, 32631-32637, November 12, 1999

p42/p44 Mitogen-activated Protein Kinases Phosphorylate Hypoxia-inducible Factor 1alpha (HIF-1alpha ) and Enhance the Transcriptional Activity of HIF-1

Darren E. Richard, Edurne Berra, Emmanuel Gothié, Danièle Roux, and Jacques Pouysségur

From the Institute of Signaling, Developmental Biology and Cancer Research, UMR CNRS 6543, Centre Antoine Lacassagne, 33 Avenue Valombrose, 06189 Nice, France

Hypoxia-inducible factor-1 (HIF-1) controls the expression of a number of genes such as vascular endothelial growth factor and erythropoietin in low oxygen conditions. However, the molecular mechanisms that underlie the activation of the limiting subunit, HIF-1alpha , are still poorly resolved. Results showing that endogenous HIF-1alpha migrated 12 kDa higher than in vitro translated protein led us to evaluate the possible role of phosphorylation on this phenomenon. We report here that HIF-1alpha is strongly phosphorylated in vivo and that phosphorylation is responsible for the marked differences in the migration pattern of HIF-1alpha . In vitro, HIF-1alpha is phosphorylated by p42 and p44 mitogen-activated protein kinases (MAPKs) and not by p38 MAPK or c-Jun N-terminal kinase. Interestingly, p42/p44 MAPK stoichiometrically phosphorylate HIF-1alpha in vitro, as judged by a complete upper shift of HIF-1alpha . More importantly, we demonstrate that activation of the p42/p44 MAPK pathway in quiescent cells induced the phosphorylation and shift of HIF-1alpha , which was abrogated in presence of the MEK inhibitor, PD 98059. Finally, we found that in a vascular endothelial growth factor promoter mutated at sites previously shown to be MAPK-sensitive (SP1/AP2-88-66 site), p42/p44 MAPK activation is sufficient to promote the transcriptional activity of HIF-1. This interaction between HIF-1alpha and p42/p44 MAPK suggests a cooperation between hypoxic and growth factor signals that ultimately leads to the increase in HIF-1-mediated gene expression.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.



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