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2016 ; 9
(ä): 6597-6604
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miR-497 suppresses epithelial-mesenchymal transition and metastasis in colorectal
cancer cells by targeting fos-related antigen-1
#MMPMID27822064
Zhang N
; Shen Q
; Zhang P
Onco Targets Ther
2016[]; 9
(ä): 6597-6604
PMID27822064
show ga
OBJECTIVE: MicroRNAs have key roles in tumor metastasis. The acquisition of
metastatic capability by cancer cells is associated with epithelial-mesenchymal
transition (EMT). Here, we describe the role and molecular mechanism of miR-497
in colorectal cancer (CRC) cell EMT, migration, and invasion. METHODS:
Quantitative real-time polymerase chain reaction and Western blot assays were
performed to detect the expression levels of miR-497 and Fos-related antigen-1
(Fra-1) in the CRC cells. HCT116 and SW480 cells with miR-497 overexpression or
Fra-1 low expression were constructed by lipofection. Target prediction and
luciferase reporter assays were performed to investigate whether Fra-1 is one of
the targets of miR-497. Western blot and Transwell assays were performed to
detect the effects of miR-497 and Fra-1 on CRC cell EMT, migration and invasion.
RESULTS: We searched the miRanda, TargetScan, and PicTar databases and found that
Fra-1, a key driver of CRC metastasis, is a potential target of miR-497.
Quantitative real-time polymerase chain reaction and Western blot analysis
verified downregulation of miR-497 and upregulation of Fra-1 in CRC cells.
Western blot and Transwell assays showed that overexpression of miR-497
suppresses CRC cell EMT, migration, and invasion. Luciferase gene reporter assay
revealed that Fra-1 is a downstream target of miR-497 as miR-497 bound directly
to the 3' untranslated region of Fra-1 messenger RNA. An inverse correlation was
also found between miR-497 and Fra-1 in HCT116 and SW480 cells. Furthermore,
knockdown of Fra-1 recuperated the effects of miR-497 overexpression. CONCLUSION:
miR-497 suppresses CRC cell EMT, migration, and invasion partly by targeting
Fra-1.