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MiR-577 suppresses epithelial-mesenchymal transition and metastasis of breast cancer by targeting Rab25.
Thoracic Cancer 2018 April
BACKGROUND: MicroRNAs can act as both tumor suppressor genes and oncogenes and participate in cell proliferation, metastasis, and apoptosis. Low levels of miR-577 are found in several cancers, for example, thyroid carcinoma, glioblastoma, and hepatocellular carcinoma. The aim of this study was to investigate the effect of miR-577 on breast cancer (BC).
METHODS: The relative level of miR-577 in 120 BC tissues and cells was detected by real-time PCR. MDA-MB-231 cells with upregulated miR-577 and MCF-7 cells with downregulated miR-577 were established. Transwell invasion assays were used to examine the invasiveness of cells. Epithelial-mesenchymal transition (EMT) markers were evaluated by immunofluorescence and Western blot. Targeted combinations of miR-577 and Rab25 were analyzed by luciferase assays. Xenograft models were used to examine the effect of miR-577 on BC metastasis.
RESULTS: MiR-577 expression was significantly suppressed in BC tissues. Tumor size, tumor stage, and lymphatic metastasis were attributed to miR-577 expression. Moreover, miR-577 overexpression strongly inhibited the invasiveness and EMT of BC cells in vitro. MiR-577 directly regulated Rab25 in BC. Rab25 upregulation by miR-577 decreased the levels of E-cadherin and increased the levels of Vimentin. Notably, Rab25 knockdown inhibited BC invasion; however, an increase in Rab25 counteracted the invasive effect of miR-577 in BC.
CONCLUSION: Results indicated that miR-577 suppressed EMT by inhibiting Rab25 expression in BC. MiR-577 and Rab25 are considered potential targets of BC treatment.
METHODS: The relative level of miR-577 in 120 BC tissues and cells was detected by real-time PCR. MDA-MB-231 cells with upregulated miR-577 and MCF-7 cells with downregulated miR-577 were established. Transwell invasion assays were used to examine the invasiveness of cells. Epithelial-mesenchymal transition (EMT) markers were evaluated by immunofluorescence and Western blot. Targeted combinations of miR-577 and Rab25 were analyzed by luciferase assays. Xenograft models were used to examine the effect of miR-577 on BC metastasis.
RESULTS: MiR-577 expression was significantly suppressed in BC tissues. Tumor size, tumor stage, and lymphatic metastasis were attributed to miR-577 expression. Moreover, miR-577 overexpression strongly inhibited the invasiveness and EMT of BC cells in vitro. MiR-577 directly regulated Rab25 in BC. Rab25 upregulation by miR-577 decreased the levels of E-cadherin and increased the levels of Vimentin. Notably, Rab25 knockdown inhibited BC invasion; however, an increase in Rab25 counteracted the invasive effect of miR-577 in BC.
CONCLUSION: Results indicated that miR-577 suppressed EMT by inhibiting Rab25 expression in BC. MiR-577 and Rab25 are considered potential targets of BC treatment.
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