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• W2496168162 abstract "The role of microRNA-200 (miR-200) family members in the migration and invasion of breast cancer is controversial. This study investigated the mechanisms by which the miR-200 family members modulated the migratory and invasive abilities of an aggressive triple-negative breast cancer (TNBC) cell line, MDA-MB-231. The miR-200 family (miR-200b/200a/429 and miR-141/200c clusters) and green fluorescence protein (GFP) were transduced into MDA-MB-231 cells using a lentiviral system. Stable cells highly expressing the miR-200 family and GFP were isolated by puromycin selection and fluorescence-activated cell sorting. Gene expression was evaluated using real-time polymerase chain reaction (PCR) and reverse transcriptase-PCR (RT-PCR). The migratory and invasive abilities were assessed using trans-well and wound-healing assays. The secreted cytokines and growth factors in cultured media were quantified using a Bio-Plex200 multiplex array system. Western blot assays and immunofluorescence staining were conducted to investigate miR-200 family-regulated signaling pathways. The entire dataset obtained in this study was statistically evaluated using a one-way ANOVA followed by a t-test. The stable overexpression of the miR-200b/200a/429 or miR-141/200c cluster suppressed cell growth and significantly increased migration and invasion of MDA-MB-231 cells. miR-141/200c overexpression was more effective in decreasing cell growth and promoting migration and invasion of MDA-MB-231 cells than was miR-200b/200a/429 overexpression. In addition, the overexpression of the miR-200b/200a/429 or miR-141/200c cluster led to an increase in the phosphorylation of focal adhesion kinase (FAK) and protein kinase B (AKT). Chemical inhibitors of FAK and phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K)/AKT suppressed the migration and invasion of MDA-MB-231 cells that was enhanced by the overexpression of the miR-200b/200a/429 or miR-141/200c cluster. Compared to the miR-200b/200a/429 cluster-transduced MDA-MB-231 cells, the miR-141/200c cluster-transduced MDA-MB-231 cells exhibited a significant increase in vascular endothelial growth factor (VEGF)-A secretion and integrin-alphaV (integrin-αV) expression. Treatment with an anti-VEGF-A-neutralizing antibody inhibited the increase in migration and invasion in both the miR-200b/200a/429- and miR-141/200c-transduced MDA-MB-231 cells but significantly reduced the phosphorylation of FAK and AKT in only the miR-141/200c cluster-transduced MDA-MB-231 cells. Taken together, our data demonstrate a mechanism in which the miR-141/200c cluster, through FAK- and PI3K/AKT-mediated signaling by means of increased VEGF-A secretion, promotes the migratory and invasive abilities of MDA-MB-231 cells." @default.
• W2496168162 created "2016-08-23" @default.
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• W2496168162 date "2016-08-02" @default.
• W2496168162 modified "2023-10-17" @default.
• W2496168162 title "Overexpression of the miR-141/200c cluster promotes the migratory and invasive ability of triple-negative breast cancer cells through the activation of the FAK and PI3K/AKT signaling pathways by secreting VEGF-A" @default.
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• W2496168162 doi "https://doi.org/10.1186/s12885-016-2620-7" @default.
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