Journal
CELL CYCLE
Volume 10, Issue 24, Pages 4256-4271Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/cc.10.24.18552
Keywords
p53; EMT; tumor suppression; SNAIL transcription factors; miR-34a/b/c microRNAs
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Funding
- German Israeli Science Foundation
- Deutsche Krebshilfe
- Rudolf-Bartling-Foundation
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Recently, the inhibition of epithelial-mesenchymal-transition (EMT) by p53 has been described as a new mode of tumor suppression which presumably prevents metastasis. Here we report that activation of p53 downregulates the EMT-inducing transcription factor SNAIL via induction of the miR-34a/b/c genes. Suppression of miR-34a caused upregulation of SNAIL and cells displayed EMT markers and related features, as enhanced migration and invasion. Ectopic miR-34a induced mesenchymal-epithelial-transition (MET) and downregulation of SNAIL, which was mediated by a conserved miR-34a/b/c seed-matching sequence in the SNAIL 3'-UTR. miR-34a also downregulated SLUG and ZEB1, as well as the stemness factors BMI1, CD44, CD133, OLFM4 and c-MYC. Conversely, the transcription factors SNAIL and ZEB1 bound to E-boxes in the miR-34a/b/c promoters, thereby repressing miR-34a and miR-34b/c expression. Since ectopic miR-34a prevented TGF-beta-induced EMT, the repression of miR-34 genes by SNAIL and related factors is part of the EMT program. In conclusion, the frequent inactivation of p53 and/or miR-34a/b/c found in cancer may shift the equilibrium of these reciprocal regulations towards the mesenchymal state and thereby lock cells in a metastatic state.
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