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2016 ; 39
(8
): 625-30
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Transforming Growth Factor-?-Induced RBFOX3 Inhibition Promotes
Epithelial-Mesenchymal Transition of Lung Cancer Cells
#MMPMID27432190
Kim YE
; Kim JO
; Park KS
; Won M
; Kim KE
; Kim KK
Mol Cells
2016[Aug]; 39
(8
): 625-30
PMID27432190
show ga
The RNA-binding protein Rbfox3 is a well-known splicing regulator that is used as
a marker for post-mitotic neurons in various vertebrate species. Although recent
studies indicate a variable expression of Rbfox3 in non-neuronal tissues,
including lung tissue, its cellular function in lung cancer remains largely
unknown. Here, we report that the number of RBFOX3-positive cells in tumorous
lung tissue is lower than that in normal lung tissue. As the transforming growth
factor-? (TGF-?) signaling pathway is important in cancer progression, we
investigated its role in RBFOX3 expression in A549 lung adenocarcinoma cells.
TGF-?1 treatment inhibited RBFOX3 expression at the transcriptional level.
Further, RBFOX3 depletion led to a change in the expression levels of a subset of
proteins related to epithelial-mesenchymal transition (EMT), such as E-cadherin
and Claudin-1, during TGF-?1-induced EMT. In immunofluorescence microscopic
analysis, mesenchymal morphology was more prominent in RBFOX3-depleted cells than
in control cells. These findings show that TGF-?-induced RBFOX3 inhibition plays
an important role in EMT and propose a novel role for RBFOX3 in cancer
progression.