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ABSTRACT: Background
MiR-646 has been reported to be aberrantly expressed in human cancers. However, the underlying molecular mechanisms of action of miR-646 in gastric cancer (GC) have not yet been investigated.Methods
In vitro function of miR-646 in GC was evaluated using EdU assay, plate colony formation assay, and matrigel invasion assay. Real-time PCR or western blotting was performed to detect miR-646 and FOXK1 expressions. In vivo tumour growth and metastasis were conducted in nude mice.Results
MiR-646 expression was downregulated in GC tissues compared with adjacent normal tissues. Low miR-646 expression is associated with malignant progression. Transient transfection of GC cells with miR-646 inhibited their growth and migration. Moreover, miR-646 influenced the expression of epithelial-mesenchymal transition (EMT)-associated proteins. TGF-?1 treatment significantly suppressed the expression of miR-646 and overexpression of this microRNA counteracted the influence of the TGF-?1-induced EMT phenotype. In terms of the underlying mechanism, miR-646 directly targeted FOXK1. In vivo, it inhibited the FOXK1-mediated proliferation and EMT-induced metastasis. Consistently, inverse correlations were also observed between the expression of miR-646 and FOXK1 in human GC tissue samples. Furthermore, miR-646 regulated Akt/mTOR signalling after FOXK1.Conclusions
miR-646 inhibited GC cell proliferation and the EMT progression in GC cells by targeting FOXK1.
SUBMITTER: Zhang P
PROVIDER: S-EPMC5558677 | biostudies-literature | 2017 Aug
REPOSITORIES: biostudies-literature
Zhang P P Tang W M WM Zhang H H Li Y Q YQ Peng Y Y Wang J J Liu G N GN Huang X T XT Zhao J J JJ Li G G Li A M AM Bai Y Y Chen Y Y Ren Y X YX Li G X GX Wang Y D YD Liu S D SD Wang J D JD
British journal of cancer 20170620 4
<h4>Background</h4>MiR-646 has been reported to be aberrantly expressed in human cancers. However, the underlying molecular mechanisms of action of miR-646 in gastric cancer (GC) have not yet been investigated.<h4>Methods</h4>In vitro function of miR-646 in GC was evaluated using EdU assay, plate colony formation assay, and matrigel invasion assay. Real-time PCR or western blotting was performed to detect miR-646 and FOXK1 expressions. In vivo tumour growth and metastasis were conducted in nude ...[more]