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2015 ; 14
(ä): 165
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Long non-coding RNA TUG1 is up-regulated in hepatocellular carcinoma and promotes
cell growth and apoptosis by epigenetically silencing of KLF2
#MMPMID26336870
Huang MD
; Chen WM
; Qi FZ
; Sun M
; Xu TP
; Ma P
; Shu YQ
Mol Cancer
2015[Sep]; 14
(ä): 165
PMID26336870
show ga
BACKGROUND: Hepatocellular carcinoma (HCC) is one of the leading causes of
cancer-related death worldwide, and the biology of this cancer remains poorly
understood. Recent evidence indicates that long non-coding RNAs (lncRNAs) are
found to be dysregulated in a variety of cancers, including HCC. Taurine
Up-regulated Gene 1 (TUG1), a 7.1-kb lncRNA, recruiting and binding to polycomb
repressive complex 2 (PRC2), is found to be disregulated in non-small cell lung
carcinoma (NSCLC) and esophageal squamous cell carcinoma (ESCC). However, its
clinical significance and potential role in HCC remain unclear. METHODS AND
RESULTS: In this study, expression of TUG1 was analyzed in 77 HCC tissues and
matched normal tissues by using quantitative polymerase chain reaction (qPCR).
TUG1 expression was up-regulated in HCC tissues and the higher expression of TUG1
was significantly correlated with tumor size and Barcelona Clinic Liver Cancer
(BCLC) stage. Moreover, silencing of TUG1 expression inhibited HCC cell
proliferation, colony formation, tumorigenicity and induced apoptosis in HCC cell
lines. We also found that TUG1 overexpression was induced by nuclear
transcription factor SP1 and TUG1 could epigeneticly repress Kruppel-like factor
2 (KLF2) transcription in HCC cells by binding with PRC2 and recruiting it to
KLF2 promoter region. CONCLUSION: Our results suggest that lncRNA TUG1, as a
growth regulator, may serve as a new diagnostic biomarker and therapy target for
HCC.