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2014 ; 5
(6
): e1287
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LincRNA-ROR induces epithelial-to-mesenchymal transition and contributes to
breast cancer tumorigenesis and metastasis
#MMPMID24922071
Hou P
; Zhao Y
; Li Z
; Yao R
; Ma M
; Gao Y
; Zhao L
; Zhang Y
; Huang B
; Lu J
Cell Death Dis
2014[Jun]; 5
(6
): e1287
PMID24922071
show ga
LncRNAs have critical roles in various biological processes ranging from
embryonic development to human diseases, including cancer progression, although
their detailed mechanistic functions remain illusive. The lncRNA linc-ROR has
been shown to contribute to the maintenance of induced pluripotent stem cells and
embryonic stem cells. In this study, we discovered that linc-ROR was upregulated
in breast tumor samples, and ectopic overexpression of linc-ROR in immortalized
human mammary epithelial cells induced an epithelial-to-mesenchymal transition
(EMT) program. Moreover, we showed that linc-ROR enhanced breast cancer cell
migration and invasion, which was accompanied by generation of stem cell
properties. Contrarily, silencing of linc-ROR repressed breast tumor growth and
lung metastasis in vivo. Mechanistically, our data revealed that linc-ROR was
associated with miRNPs and functioned as a competing endogenous RNA to mi-205.
Specifically, linc-ROR prevented the degradation of mir-205 target genes,
including the EMT inducer ZEB2. Thus our results indicate that linc-ROR functions
as an important regulator of EMT and can promote breast cancer progression and
metastasis through regulation of miRNAs. Potentially, the findings of this study
implicate the relevance of linc-ROR as a possible therapeutic target for
aggressive and metastatic breast cancers.