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MicroRNA-556-3p promotes the progression of esophageal cancer via targeting DAB2IP.

Eur Rev Med Pharmacol Sci. 2018 Oct;22(20):6816-6823. doi:10.26355/eurrev_201810_16149
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摘要


OBJECTIVE:To detect the expression of microRNA-556-3p in esophageal cancer (EC) tissues and to elucidate the mechanisms underlying microRNA-556-3p in promoting EC progression. PATIENTS AND METHODS:QRT-PCR (quantitative Real-Time was performed to detect microRNA-556-3p expression in 65 cases of EC tissues, 30 cases of normal esophageal tissues and EC cell lines. The overall survival (OS) of EC patients was calculated based on the 10-year follow-up data. For in vitro experiments, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) and transwell assay were performed to evaluate the effect of microRNA-556-3p on the proliferative and invasive abilities of EC cells. The effect of microRNA-556-3p on DAB2IP and MAPK pathway was determined by Western blot and qRT-PCR. The binding condition between microRNA-556-3p and DAB2IP was further confirmed by Luciferase reporter gene assay. RESULTS:MicroRNA-556-3p expression was upregulated in EC tissues than that of paracancerous tissues. EC patients with higher expression of microRNA-556-3p presented a shorter OS than those with lower expression. Moreover, microRNA-556-3p overexpression in EC cells remarkably promoted cell viability. Upregulated microRNA-556-3p in Eca109 and Eca7906 cell lines markedly increased cell proliferation and invasion. The expression level of DAB2IP was negatively regulated by microRNA-556-3p verified by the Luciferase reporter gene assay. CONCLUSIONS:MicroRNA-556-3p blocked the translation of DAB2IP at mRNA level by directly binding to 3'UTR of DAB2IP, thereafter enhancing the proliferation of Eca109 and Eca7906 cells. MicroRNA-556-3p promoted the occurrence and development of EC. Our study provided a new theoretical basis and therapeutic target for EC treatment.

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