Regulation of hypoxia-inducible factor-1alpha protein level during hypoxic conditions by the phosphatidylinositol 3-kinase/Akt/glycogen synthase kinase 3beta pathway in HepG2 cells.
[en] Hypoxia initiates an intracellular signaling pathway leading to the activation of the transcription factor hypoxia-inducible factor-1 (HIF-1). HIF-1 activity is regulated through different mechanisms involving stabilization of HIF-1alpha, phosphorylations, modifications of redox conditions, and interactions with coactivators. However, it appears that some of these steps can be cell type-specific. Among them, the involvement of the phosphatidylinositol 3-kinase (PI3K)/Akt pathway in the regulation of HIF-1 by hypoxia remains controversial. Here, we investigated the activation state of PI3K/Akt/glycogen synthase kinase 3beta (GSK3beta) in HepG2 cells. Increasing incubation times in hypoxia dramatically decreased both the phosphorylation of Akt and the inhibiting phosphorylation of GSK3beta. The PI3K/Akt pathway was necessary for HIF-1alpha stabilization early during hypoxia. Indeed, its inhibition was sufficient to decrease HIF-1alpha protein level after 5-h incubation in hypoxia. However, longer exposure (16 h) in hypoxia resulted in a decreased HIF-1alpha protein level compared with early exposure (5 h). At that time, Akt was no longer present or active, which resulted in a decrease in the inhibiting phosphorylation of GSK3beta on Ser-9 and hence in an increased GSK3beta activity. GSK3 inhibition reverted the effect of prolonged hypoxia on HIF-1alpha protein level; more stabilized HIF-1alpha was observed as well as increased HIF-1 transcriptional activity. Thus, a prolonged hypoxia activates GSK3beta, which results in decreased HIF-1alpha accumulation. In conclusion, hypoxia induced a biphasic effect on HIF-1alpha stabilization with accumulation in early hypoxia, which depends on an active PI3K/Akt pathway and an inactive GSK3beta, whereas prolonged hypoxia results in the inactivation of Akt and activation of GSK3beta, which then down-regulates the HIF-1 activity through down-regulation of HIF-1alpha accumulation.
Mottet, Denis ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques > GIGA-R : Labo de recherche sur les métastases
Dumont, Valery
Deccache, Yann
Demazy, Catherine
Ninane, Noelle
Raes, Martine
Michiels, Carine
Language :
English
Title :
Regulation of hypoxia-inducible factor-1alpha protein level during hypoxic conditions by the phosphatidylinositol 3-kinase/Akt/glycogen synthase kinase 3beta pathway in HepG2 cells.
Publication date :
2003
Journal title :
Journal of Biological Chemistry
ISSN :
0021-9258
eISSN :
1083-351X
Publisher :
American Society for Biochemistry and Molecular Biology, Baltimore, United States - Maryland
Volume :
278
Issue :
33
Pages :
31277-85
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE] F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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