TGFß-induced c-Myb affects the expression of EMT-associated genes and promotes invasion of ER+ breast cancer cells.
Cell Cycle
; 10(23): 4149-61, 2011 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-22101269
ABSTRACT
Advanced breast cancer cells acquire metastatic properties in response to TGFß. We show here that the expression of c-Myb increases in TGFß-treated ER (+) breast cancer cells by protein stabilization, transcription activation and release from miR200-dependent down-regulation. In particular, we mapped 2 sites for miR200b, miR200c and miR429 binding in the 3' UTR of the human c-myb gene. These microRNAs decreased the expression of c-Myb when transfected in MCF-7 cells. In addition, luciferase activity from a vector containing the 3' UTR of the c-myb gene was inhibited by miR200s through a binding-dependent mechanism. siRNA- and shRNA-mediated down-regulation was used to investigate the role of c-Myb for the effects induced by TGFß in ER(+) breast cancer MCF-7 and ZR-75.1 cells. Transfection with c-Myb siRNAs blocked the increase of Slug (SNAI2) and Bcl-2 expression and reversed the decrease in E-cadherin expression induced by TGF-ß treatment. Conversely, c-Myb down-regulation decreased invasion and anchorage-independent growth of breast cancer cells expressing a constitutively active TGFß receptor I. Finally, apoptosis induced by etoposide increased in c-Myb-silenced TGFß-treated ER(+) cell lines. In summary, exposure of ER(+) breast cancer cells to TGFß induces an increase of c-Myb expression which is required for expression of EMT-associated markers, in vitro invasion and anchorage-independent growth. Furthermore, our findings suggest a potentially detrimental effect of TGFß and c-Myb co-expression in breast cancer.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Mama
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Regulação Neoplásica da Expressão Gênica
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Fator de Crescimento Transformador beta
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Proteínas Proto-Oncogênicas c-myb
Tipo de estudo:
Risk_factors_studies
Idioma:
En
Revista:
Cell Cycle
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Itália