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2017 ; 25
(4
): 1027-1037
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The microRNA-423-3p-Bim Axis Promotes Cancer Progression and Activates Oncogenic
Autophagy in Gastric Cancer
#MMPMID28254439
Kong P
; Zhu X
; Geng Q
; Xia L
; Sun X
; Chen Y
; Li W
; Zhou Z
; Zhan Y
; Xu D
Mol Ther
2017[Apr]; 25
(4
): 1027-1037
PMID28254439
show ga
Human serum microRNAs (miRNAs) have been shown to serve as disease fingerprints
for predicting survival of cancer patients. However, the roles of specific miRNAs
involved in gastric cancer (GC) are largely unknown. In this study, miRNA
profiling was performed on sera obtained from six patients in good- and
poor-survival groups. Expression of miR-423-3p was validated by quantitative
RT-PCR in another 67 GC serum samples and paired normal and cancerous gastric
tissues. Luciferase reporter assays were used to identify the target gene
Bcl-2-interacting mediator of cell death (Bim). As a result, between the
good-survival and poor-survival groups, the expression of nine serum miRNAs was
altered more than two-fold. Among these, miR-423-3p was significantly increased
in the poor-survival group, and its overexpression in GC tissues predicted poor
survival in 119 patients with GC. miR-423-3p was found to promote cell
proliferation, migration, and invasion in cell lines and animal models.
Mechanistically, knockdown of the autophagy-related gene (Atg) 7 rescued the
GC-promoting effect of miR-423-3p. In conclusion, miR-423-3p activates oncogenic
and Beclin-1-dependent autophagy and promotes GC progression by reducing
the expression of Bim. The newly identified miR-423-3p-Bim axis might be a
potential therapeutic target in GC.