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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Cancer+Res
2018 ; 8
(3
): 435-449
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microRNA-532 suppresses the PI3K/Akt signaling pathway to inhibit colorectal
cancer progression by directly targeting IGF-1R
#MMPMID29636999
Song Y
; Zhao Y
; Ding X
; Wang X
Am J Cancer Res
2018[]; 8
(3
): 435-449
PMID29636999
show ga
Substantial evidence has shown that numerous microRNAs (miRNAs) are deregulated
in colorectal cancer (CRC) and that their dysregulation is involved in CRC
formation and progression. miRNA-based targeted therapy that inhibits or restores
expression may be a promising therapeutic approach for anti-cancer therapy.
Therefore, a comprehensive investigation of the mechanisms underlying CRC
occurrence and development may help identify effective therapeutic targets for
the therapy of CRC, thus improving the prognosis of patients with this disease.
This study showed that miRNA-532 (miR-532) was significantly down-regulated in
CRC tissues and cell lines. Low miR-532 expression strongly correlated with
aggressive clinicopathological characteristics, including tumor size, lymphatic
metastasis and TNM stage. Exogenous expression of miR-532 restricted cell
proliferation, colony formation, migration and invasion; promoted cell apoptosis
in vitro; and reduced tumor growth in vivo. Mechanistically, insulin-like growth
factor 1 receptor (IGF-1R) was determined to be a novel direct target gene of
miR-532 in CRC. In clinical CRC tissues, the expression of miR-532 was inversely
correlated with that of IGF-1R, which was clearly overexpressed in CRC tissues.
Furthermore, IGF-1R silencing simulated the tumor-suppressing roles of miR-532 in
CRC. Moreover, recovered IGF-1R expression antagonized the inhibitory effects of
miR-532 overexpression on CRC cells. Notably, miR-532 overexpression inhibited
activation of the PI3K/Akt signaling pathway in CRC, both in vitro and in vivo.
These results indicate that miR-532 plays an important role in CRC development,
partly by directly targeting IGF-1R and regulating the PI3K/Akt signaling
pathway. Thus, the miR-532/IGF-1R axis has clinical significance in the therapy
of patients with CRC.