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2015 ; 5
(ä): 17618
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MiR-181b regulates cisplatin chemosensitivity and metastasis by targeting
TGF?R1/Smad signaling pathway in NSCLC
#MMPMID26620926
Wang X
; Chen X
; Meng Q
; Jing H
; Lu H
; Yang Y
; Cai L
; Zhao Y
Sci Rep
2015[Dec]; 5
(ä): 17618
PMID26620926
show ga
MicroRNAs (miRNAs) have been identified as important post-transcriptional
regulators involved in various biological and pathological processes of cells,
but their underlying mechanisms in chemosensitivity and metastasis have not been
fully elucidated. The objective of this study was to identify miR-181b and its
mechanism in the chemosensitivity and metastasis of NSCLC. We found that miR-181b
expression levels were lower in A549/DDP cells compared with A549 cells.
Functional assays showed that the overexpression of miR-181b inhibited
proliferation, enhanced chemosensitivity to DDP, attenuated migration and
metastatic ability in NSCLC cell lines in vitro and in vivo. TGF?R1 was
subsequently identified as a novel functional target of miR-181b. TGF?R1
knockdown revealed similar effects as that of ectopic miR-181b expression,
whereas overexpression of TGF?R1 rescued the function of miR-181b-mediated
growth, chemosensitivity and metastasis in NSCLC cells. In addition, miR-181b
could inactivate the TGF?R1/Smad signaling pathway. We also observed that
decreased miR-181b expression and increased TGF?R1 expression were significantly
associated with chemosensitivity to DDP and tumor metastasis in NSCLC patients.
Consequently, miR-181b functions as a tumor suppressor and has an important role
in proliferation, chemosensitivity to DDP and metastasis of NSCLC by targeting
TGF?R1/Smad signaling pathway.