Abstract
Loss of 4E-BP1 expression has been linked to cancer progression and resistance to mTOR inhibitors, but the mechanism underlying 4E-BP1 downregulation in tumors remains unclear. Here we identify Snail as a strong transcriptional repressor of 4E-BP1. We find that 4E-BP1 expression inversely correlates with Snail level in cancer cell lines and clinical specimens. Snail binds to three E-boxes present in the human 4E-BP1 promoter to repress transcription of 4E-BP1. Ectopic expression of Snail in cancer cell lines lacking Snail profoundly represses 4E-BP1 expression, promotes cap-dependent translation in polysomes, and reduces the anti-proliferative effect of mTOR kinase inhibitors. Conversely, genetic and pharmacological inhibition of Snail function restores 4E-BP1 expression and sensitizes cancer cells to mTOR kinase inhibitors by enhancing 4E-BP1-mediated translation-repressive effect on cell proliferation and tumor growth. Our study reveals a critical Snail-4E-BP1 signaling axis in tumorigenesis, and provides a rationale for targeting Snail to improve mTOR-targeted therapies.
Original language | English |
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Article number | 2207 |
Journal | Nature Communications |
Volume | 8 |
Issue number | 1 |
DOIs | |
State | Published - Dec 1 2017 |
Bibliographical note
Publisher Copyright:© 2017 The Author(s).
Funding
We thank the Markey Cancer Center Research Communication Office for assistance with editing this manuscript. This work was supported by grants from NIH R01CA175105 and NIH R01CA203257 (Q.-B.S.). We also acknowledge use of the UK Flow Cytometry & Cell Sorting core facility, supported in part by the Office of the Vice President for Research and the Markey Cancer Center NCI Center Core Support Grant (P30CA177558).
Funders | Funder number |
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Markey Cancer Center NCI | P30CA177558 |
Office of the Vice President for Research | |
National Institutes of Health (NIH) | R01CA175105 |
National Childhood Cancer Registry – National Cancer Institute | R01CA203257 |
ASJC Scopus subject areas
- General Chemistry
- General Biochemistry, Genetics and Molecular Biology
- General Physics and Astronomy