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2017 ; 8
(47
): 82174-82184
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Quaking-5 suppresses aggressiveness of lung cancer cells through inhibiting
?-catenin signaling pathway
#MMPMID29137254
Zhou X
; Li X
; Sun C
; Shi C
; Hua D
; Yu L
; Wen Y
; Hua F
; Wang Q
; Zhou Q
; Yu S
Oncotarget
2017[Oct]; 8
(47
): 82174-82184
PMID29137254
show ga
Quaking-5 (QKI-5) belongs to the STAR (signal transduction and activation of RNA)
family of RNA binding proteins and functions as a tumor suppressor in several
human malignancies. In this study, we attempt to elucidate the role of QKI-5 in
the pro-metastasis processes of lung cancer (LC) cells and the underlying
mechanisms. We confirmed that QKI-5 was decreased in human LC tissues and cell
lines, especially in high-metastatic cells. Moreover, QKI expression was
positively correlated with LC patients' survival. Functional studies verified
that QKI-5 suppressed migration, invasion and TGF-?1-induced
epithelial-mesenchymal transition (EMT) of LC cells. Mechanistically, we affirmed
that QKI-5 reduced ?-catenin level in LC cells via suppressing its translation
and promoting its degradation, whereas QKI-5 promoter hypermethylation suppressed
QKI-5 expression. Our findings indicate that QKI-5 inhibits pro-metastasis
processes of LC cells through interdicting ?-catenin signaling pathway, and that
QKI-5 promoter hypermethylation is a crucial epigenetic regulation reducing QKI-5
expression in LC cells, and reveal that QKI-5 is a potential prognostic biomarker
for LC patients.