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2016 ; 36
(19
): 2503-13
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Mesenchymal-Epithelial Transition in Sarcomas Is Controlled by the Combinatorial
Expression of MicroRNA 200s and GRHL2
#MMPMID27402864
Somarelli JA
; Shetler S
; Jolly MK
; Wang X
; Bartholf Dewitt S
; Hish AJ
; Gilja S
; Eward WC
; Ware KE
; Levine H
; Armstrong AJ
; Garcia-Blanco MA
Mol Cell Biol
2016[Oct]; 36
(19
): 2503-13
PMID27402864
show ga
Phenotypic plasticity involves a process in which cells transiently acquire
phenotypic traits of another lineage. Two commonly studied types of phenotypic
plasticity are epithelial-mesenchymal transition (EMT) and mesenchymal-epithelial
transition (MET). In carcinomas, EMT drives invasion and metastatic
dissemination, while MET is proposed to play a role in metastatic colonization.
Phenotypic plasticity in sarcomas is not well studied; however, there is evidence
that a subset of sarcomas undergo an MET-like phenomenon. While the exact
mechanisms by which these transitions occur remain largely unknown, it is likely
that some of the same master regulators that drive EMT and MET in carcinomas also
act in sarcomas. In this study, we combined mathematical models with bench
experiments to identify a core regulatory circuit that controls MET in sarcomas.
This circuit comprises the microRNA 200 (miR-200) family, ZEB1, and GRHL2.
Interestingly, combined expression of miR-200s and GRHL2 further upregulates
epithelial genes to induce MET. This effect is phenocopied by downregulation of
either ZEB1 or the ZEB1 cofactor, BRG1. In addition, an MET gene expression
signature is prognostic for improved overall survival in sarcoma patients.
Together, our results suggest that a miR-200, ZEB1, GRHL2 gene regulatory network
may drive sarcoma cells to a more epithelial-like state and that this likely has
prognostic relevance.