MicroRNA-455-3p mediates GATA3 tumor suppression in mammary epithelial cells by inhibiting TGF-ß signaling.
J Biol Chem
; 294(43): 15808-15825, 2019 10 25.
Article
en En
| MEDLINE
| ID: mdl-31492753
ABSTRACT
GATA3 is a basic and essential transcription factor that regulates many pathophysiological processes and is required for the development of mammary luminal epithelial cells. Loss-of-function GATA3 alterations in breast cancer are associated with poor prognosis. Here, we sought to understand the tumor-suppressive functions GATA3 normally performs. We discovered a role for GATA3 in suppressing epithelial-to-mesenchymal transition (EMT) in breast cancer by activating miR-455-3p expression. Enforced expression of miR-455-3p alone partially prevented EMT induced by transforming growth factor ß (TGF-ß) both in cells and tumor xenografts by directly inhibiting key components of TGF-ß signaling. Pathway and biochemical analyses showed that one miRNA-455-3p target, the TGF-ß-induced protein ZEB1, recruits the Mi-2/nucleosome remodeling and deacetylase (NuRD) complex to the promotor region of miR-455 to strictly repress the GATA3-induced transcription of this microRNA. Considering that ZEB1 enhances TGF-ß signaling, we delineated a double-feedback interaction between ZEB1 and miR-455-3p, in addition to the repressive effect of miR-455-3p on TGF-ß signaling. Our study revealed that a feedback loop between these two axes, specifically GATA3-induced miR-455-3p expression, could repress ZEB1 and its recruitment of NuRD (MTA1) to suppress miR-455, which ultimately regulates TGF-ß signaling. In conclusion, we identified that miR-455-3p plays a pivotal role in inhibiting the EMT and TGF-ß signaling pathway and maintaining cell differentiation. This forms the basis of that miR-455-3p might be a promising therapeutic intervention for breast cancer.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Transducción de Señal
/
Factor de Crecimiento Transformador beta
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MicroARNs
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Células Epiteliales
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Factor de Transcripción GATA3
Tipo de estudio:
Prognostic_studies
Límite:
Animals
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Female
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Humans
Idioma:
En
Revista:
J Biol Chem
Año:
2019
Tipo del documento:
Article