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2015 ; 6
(19
): 17661-74
Nephropedia Template TP
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English Wikipedia
Histone demethylase RBP2 promotes malignant progression of gastric cancer through
TGF-?1-(p-Smad3)-RBP2-E-cadherin-Smad3 feedback circuit
#MMPMID25974964
Liang X
; Zeng J
; Wang L
; Shen L
; Ma X
; Li S
; Wu Y
; Ma L
; Ci X
; Guo Q
; Jia M
; Shen H
; Sun Y
; Liu Z
; Liu S
; Li W
; Yu H
; Chen C
; Jia J
Oncotarget
2015[Jul]; 6
(19
): 17661-74
PMID25974964
show ga
Some feedback pathways are critical in the process of tumor development or
malignant progression. However the mechanisms through which these pathways are
epigenetically regulated have not been fully elucidated. Here, we demonstrated
that the histone demethylase RBP2 was crucial for
TGF-?1-(p-Smad3)-RBP2-E-cadherin-Smad3 feedback circuit that was implicated in
malignant progression of tumors and its knockdown significantly inhibited gastric
cancer (GC) metastasis both in vitro and in vivo. Mechanistically, RBP2 can
directly bind to E-cadherin promoter and suppress its expression, facilitating
EMT and distant metastasis of GC. RBP2 can also be induced by TGF-?1, a key
inducer of EMT, through phosphorylated Smad3 (p-Smad3) pathway in GC. The
upregulated RBP2 can be recruited by p-smad3 to E-cadherin promoter and enhance
its suppression, contributing to the promotion of metastasis of GC. In addition,
the suppression of E-cadherin by RBP2 attenuated inhibition of Smad3
phosphorylation (exerted by E-cadherin), resulting further induction of RBP2
expression, and thus constituting positive feedback regulation during GC
malignant progression. This TGF-?1-(p-Smad3)-RBP2-E-cadherin-Smad3 feedback
circuit may be a novel mechanism for GC malignant progression and suppression of
RBP2 expression may serve as a new strategy for the prevention of tumor distant
metastasis.