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2015 ; 106
(8
): 982-9
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53BP1 suppresses epithelial-mesenchymal transition by downregulating ZEB1 through
microRNA-200b/429 in breast cancer
#MMPMID26011542
Kong X
; Ding X
; Li X
; Gao S
; Yang Q
Cancer Sci
2015[Aug]; 106
(8
): 982-9
PMID26011542
show ga
Epithelial-mesenchymal transition (EMT) is an important mechanism of cancer
invasion and metastasis. Although p53 binding protein 1 (53BP1) has been
implicated in several biological processes, its function in EMT of human cancers
has not yet been reported. Here, we show that 53BP1 negatively regulated EMT by
modulating ZEB1 through targeting microRNA (miR)-200b and miR-429. Furthermore,
53BP1 promoted ZEB1-mediated upregulation of E-cadherin and also inhibited the
expressions of mesenchymal markers, leading to increased migration and invasion
in MDA-MB-231 breast cancer cells. Consistently, in MCF-7 breast cancer cells,
low 53BP1 expression reduced E-cadherin expression, resulting in increased
migration and invasion. These effects were reversed by miR-200b and miR-429
inhibition or overexpression. Sections of tumor xenograft model showed increased
ZEB1 expression and decreased E-cadherin expression with the downregulation of
53BP1. In 18 clinical tissue samples, expression of 53BP1 was positively
correlated with miR-200b and mir-429 and negatively correlated with ZEB1. It was
also found that 53BP1 was associated with lymph node metastasis. Taken together,
these results suggest that 53BP1 functioned as a tumor suppressor gene by its
novel negative control of EMT through regulating the expression of miR-200b/429
and their target gene ZEB1.