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2017 ; 8
(3
): 5092-5110
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Cancer upregulated gene 2 induces epithelial-mesenchymal transition of human lung
cancer cells via TGF-? signaling
#MMPMID27974707
Kaowinn S
; Kim J
; Lee J
; Shin DH
; Kang CD
; Kim DK
; Lee S
; Kang MK
; Koh SS
; Kim SJ
; Chung YH
Oncotarget
2017[Jan]; 8
(3
): 5092-5110
PMID27974707
show ga
Cancer upregulated gene 2 (CUG2) enhances cell migration and invasion, but the
underlying mechanism has not been revealed. Herein, CUG2 decreased the expression
of E-cadherin and increased the expression of N-cadherin and vimentin,
characteristics of the epithelial-mesenchymal transition (EMT). A CUG2 deletion
mutant, lacking interaction with nucleophosmin 1 (NPM1), or suppression of NPM1
reduced wound healing and cell invasion, indicating that CUG2-mediated EMT
requires NPM1. CUG2 enhanced activation of Smad2/3 and expression of Snail and
Twist, while the CUG2 silence decreased these TGF-? signaling pathways, leading
to suppression of EMT. NPM silence also inhibited the CUG2-induced TGF-?
signaling. These results suggest that TGF-? signaling is involved in CUG2-induced
EMT. Treatment with EW-7197, a novel inhibitor of TGF-? signaling, diminished
CUG2-mediated EMT and inhibition of Akt, ERK, JNK, and p38 MAPK, non-canonical
TGF-? signaling molecules, also decreased expression of Smad2/3, Snail and Twist,
leading to inhibition of EMT. The results confirm that TGF-? signaling is
essential for CUG2-mediated EMT. Interestingly, TGF-? enhanced CUG2 expression.
We further found that both CUG2-induced TGF-? production and TGF-?-induced CUG2
up-regulation required a physical interaction between Sp1 and Smad2/3 in the CUG2
and TGF-? promoter, as demonstrated by a promoter reporter assay,
immunoprecipitation, and ChIP assay. These results indicated close crosstalk
between CUG2 and TGF-?. Conversely, suppression of CUG2 or NPM1 did not
completely inhibit TGF-?-induced EMT, indicating that the effect of TGF-? on EMT
is dominant over the effect of CUG2 on EMT. Collectively, our findings suggest
that CUG2 induces the EMT via TGF-? signaling.