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J Biol Chem. 2015 Mar 13;290(11):6857-67. doi: 10.1074/jbc.M114.610915. Epub 2015 Jan 20.

Long non-coding RNAs (LncRNA) regulated by transforming growth factor (TGF) β: LncRNA-hit-mediated TGFβ-induced epithelial to mesenchymal transition in mammary epithelia.

Author information

1
From the Departments of Molecular Oncology.
2
the Zhejiang Cancer Hospital & Zhejiang Cancer Research Institute, Zhejiang 310022, China.
3
Cancer Epidemiology, and.
4
Anatomic Pathology, Lee Moffitt Cancer Center and Research Institute, Tampa, Florida 33612 and.
5
From the Departments of Molecular Oncology, jin.cheng@moffitt.org.

Abstract

Long noncoding RNAs (lncRNAs) are emerging as key regulators in various biological processes. Epithelial-to-mesenchymal transition (EMT) is a developmental process hijacked by tumor cells to depart from the primary tumor site, invade surrounding tissue, and establish distant metastases. Transforming growth factor β (TGFβ) signaling has been shown to be a major inducer of EMT and to facilitate breast cancer metastasis. However, the role of lncRNAs in this process remains largely unknown. Here we report a genome-wide lncRNA profile in mouse mammary epithelial NMuMG cells upon TGFβ induction of EMT. Among 10,802 lncRNAs profiled, over 600 were up-regulated and down-regulated during the EMT, respectively. Furthermore, we identify that lncRNA-HIT (HOXA transcript induced by TGFβ) mediates TGFβ function, i.e. depletion of lncRNA-HIT inhibits TGFβ-induced migration, invasion, and EMT in NMuMG. LncRNA-HIT is also significantly elevated in the highly metastatic 4T1 cells. Knockdown of lncRNA-HIT in 4T1 results in decrease of cell migration, invasion, tumor growth, and metastasis. E-cadherin was identified as a major target of lncRNA-HIT. Moreover, lncRNA-HIT is conserved in humans and elevated expression associates with more invasive human primary breast carcinoma. Collectively, these data suggest that a subset of lncRNAs such as lncRNA-HIT play a significant role in regulation of EMT and breast cancer invasion and metastasis, and could be potential therapeutic targets in breast cancers.

KEYWORDS:

Breast Cancer; Epithelial-esenchymal Transition (EMT); Long Noncoding RNA (Long ncRNA, LncRNA); Metastasis; Transforming Growth Factor β (TGF-β)

PMID:
25605728
PMCID:
PMC4358111
DOI:
10.1074/jbc.M114.610915
[Indexed for MEDLINE]
Free PMC Article

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