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Under anoxia a coordinated, cytoprotective program is induced, called the unfolded protein response (UPR). Activating transcription factor 4 (ATF4) is a mediator of the UPR and activates a gene expression program, promoting tumour growth and survival under anoxia. A key gene induced by ATF4 under normoxic conditions is SKIP3. We characterized the induction of SKIP3 during anoxic exposure to determine whether UPR alone was sufficient or there was a more complex regulatory response to anoxia. There was temporal separation of acute hypoxia-inducible factor (HIF)-1alpha- and chronic ATF4-dependent gene expression programs. SKIP3 was regulated by chronic (48 h) rather than acute anoxia (<24 h) by a complex set of pathways and mechanisms, besides ATF4 induced by the classical UPR, there was transcriptional regulation by nuclear factor-kappa B (NF-kappaB) and RNA stabilization by HuR. Temporal activation of the NF-kappaB pathway under anoxia protected cells from negative consequences of the oxygen stress and involved the canonical signalling pathways that promote IkappaBA phosphorylation and degradation, and reduced mRNA level of the inhibitory protein IkappaBA followed by the translational repression of IkappaBA. We also show that SKIP3 acts as an inhibitor of NF-kappaB and ATF4-dependent transcription under anoxia and provides a regulatory feedback loop. Repression of the survival pathway NF-kappaB by SKIP3 sensitized cells to metabolic consequences of the anoxic stress. Thus, the response to anoxia is mediated by three pathways independently of HIF, suggesting that combined therapeutic approaches would be needed to maximize effects against this pathway.

Original publication

DOI

10.1038/onc.2008.100

Type

Journal article

Journal

Oncogene

Publication Date

31/07/2008

Volume

27

Pages

4532 - 4543

Keywords

Activating Transcription Factor 4, Antigens, Surface, Breast Neoplasms, Cell Cycle Proteins, Cell Hypoxia, Cell Line, Tumor, Cell Survival, ELAV Proteins, ELAV-Like Protein 1, Female, Gene Expression Regulation, Neoplastic, Humans, Hypoxia-Inducible Factor 1, alpha Subunit, I-kappa B Proteins, NF-KappaB Inhibitor alpha, NF-kappa B, Neoplasm Proteins, Phosphorylation, Protein Folding, Protein-Serine-Threonine Kinases, RNA Stability, RNA, Messenger, RNA, Neoplasm, RNA-Binding Proteins, Repressor Proteins, Signal Transduction, Time Factors