Identification of a MET-eIF4G1 translational regulation axis that controls HIF-1α levels under hypoxia.

Details

Serval ID
serval:BIB_01640A4086EF
Type
Article: article from journal or magazin.
Collection
Publications
Title
Identification of a MET-eIF4G1 translational regulation axis that controls HIF-1α levels under hypoxia.
Journal
Oncogene
Author(s)
Glück A.A., Orlando E., Leiser D., Poliaková M., Nisa L., Quintin A., Gavini J., Stroka D.M., Berezowska S., Bubendorf L., Blaukat A., Aebersold D.M., Medová M., Zimmer Y.
ISSN
1476-5594 (Electronic)
ISSN-L
0950-9232
Publication state
Published
Issued date
07/2018
Peer-reviewed
Oui
Volume
37
Number
30
Pages
4181-4196
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Poor oxygenation is a common hallmark of solid cancers that strongly associates with aggressive tumor progression and treatment resistance. While a hypoxia-inducible factor 1α (HIF-1α)-associated transcriptional overexpression of the hepatocyte growth factor (HGF) receptor tyrosine kinase (RTK) MET has been previously documented, any regulation of the HIF-1α system through MET downstream signaling in hypoxic tumors has not been yet described. By using MET-driven in vitro as well as ex vivo tumor organotypic fresh tissue models we report that MET targeting results in depletion of HIF-1α and its various downstream targets. Mechanistically, we provide evidence that MET regulates HIF-1α levels through a protein translation mechanism that relies on phosphorylation modulation of the eukaryotic initiation factor 4G1 (eIF4G1) on serine 1232 (Ser-1232). Targeted phosphoproteomics data demonstrate a significant drop in eIF4G1 Ser-1232 phosphorylation following MET targeting, which is linked to an increased affinity between eIF4G1 and eIF4E. Since phosphorylation of eIF4G1 on Ser-1232 is largely mediated through mitogen-activated protein kinase (MAPK), we show that expression of a constitutively active K-RAS variant is sufficient to abrogate the inhibitory effect of MET targeting on the HIF-1α pathway with subsequent resistance of tumor cells to MET targeting under hypoxic conditions. Analysis of The Cancer Genome Atlas data demonstrates frequent co-expression of MET, HIF-1α and eIF4G1 in various solid tumors and its impact on disease-free survival of non-small cell lung cancer patients. Clinical relevance of the MET-eIF4G1-HIF-1α pathway is further supported by a co-occurrence of their expression in common tumor regions of individual lung cancer patients.
Keywords
Animals, Carcinoma, Non-Small-Cell Lung/genetics, Cell Line, Tumor, Disease-Free Survival, Eukaryotic Initiation Factor-4G/genetics, Gene Expression Regulation, Neoplastic/genetics, Humans, Hypoxia/genetics, Hypoxia-Inducible Factor 1, alpha Subunit/genetics, Lung Neoplasms/genetics, Mice, Mitogen-Activated Protein Kinases/genetics, Phosphorylation/genetics, Proto-Oncogene Proteins c-met/genetics, Signal Transduction/genetics
Pubmed
Web of science
Create date
29/06/2020 9:33
Last modification date
30/06/2020 5:26
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