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2018 ; 9
(2
): 209
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MiR-22 suppresses epithelial-mesenchymal transition in bladder cancer by
inhibiting Snail and MAPK1/Slug/vimentin feedback loop
#MMPMID29434190
Xu M
; Li J
; Wang X
; Meng S
; Shen J
; Wang S
; Xu X
; Xie B
; Liu B
; Xie L
Cell Death Dis
2018[Feb]; 9
(2
): 209
PMID29434190
show ga
MicroRNAs (miRNAs) have been validated to play prominent roles in the occurrence
and development of bladder cancer (BCa). MiR-22 was previously reported to act as
a tumor suppressor or oncomiRNA in various types of cancer. However, its accurate
expression, function, and mechanism in BCa remain unclear. Here, we find that
miR-22 is frequently downregulated in BCa tissues compared with adjacent
non-cancerous tissues. Overexpression of miR-22 significantly inhibits
proliferation, migration, and invasion of BCa cells both in vitro and in vivo.
Importantly, miR-22 is found to suppress cell proliferation/apoptosis by directly
targeting MAPK1 (mitogen-activated protein kinase 1, ERK2) and inhibit cell
motility by targeting both MAPK1 and Snail. Further statistical analysis shows
that low-expression of MAPK1 or Snail is an independent prognostic factor for a
better overall survival in patients with BCa (n?=?401). Importantly, we describe
an important regenerative feedback loop among vimentin, Slug and MAPK1 in BCa
cells. MAPK1-induced Slug expression upregulates vimentin. Vimentin in turn
activates MAPK1. By inhibiting Snail and MAPK1/Slug/vimentin feedback loop,
miR-22 suppresses epithelial-mesenchymal transition (EMT) of BCa cells in vitro
as well as in vivo. Taken together, this study reveals that miR-22 is critical to
the proliferation, apoptosis and EMT progression in BCa cells. Targeting the
pathway described here may be a novel approach for inhibiting proliferation and
metastasis of BCa.
|*Epithelial-Mesenchymal Transition
[MESH]
|*Signal Transduction
[MESH]
|Animals
[MESH]
|Cell Line, Tumor
[MESH]
|Humans
[MESH]
|Male
[MESH]
|Mice, Inbred BALB C
[MESH]
|Mice, Nude
[MESH]
|MicroRNAs/genetics/*metabolism
[MESH]
|Mitogen-Activated Protein Kinase 1/genetics/*metabolism
[MESH]
|Neoplasm Proteins/genetics/*metabolism
[MESH]
|RNA, Neoplasm/genetics/*metabolism
[MESH]
|Snail Family Transcription Factors/genetics/*metabolism
[MESH]