[MiR-451 regulates proliferation and migration of colorectal cells by targeting MIF].

To investigate the effect and mechanism of miR-451 on the proliferation and migration of human colorectal cancer cell SW480 by targeting macrophage migration inhibitory factor (MIF). Microarray analysis was used to screen differentially expressed microRNAs and messenger RNA in SW480 cells. Real-time quantitative PCR (RT-qPCR) was used to detect the expressions of miR-451 and MIF in SW480 cells before and after transfection. Cell clone formation assay and Transwell assay were used to detect the proliferation and invasion of SW480 cells, respectively. Cell scratch assay was used to detect the migration ability of SW480 cells. The TargetScan database was used to analyze the correlation between miR-451 and MIF. Dual luciferase reporter gene was used to detect the interaction of miR-451 and MIF. MTT assay was used to detect the viability of SW480 cells. Compared with human normal colorectal mucosal cell FHC (1.00), the expression of miR-451 was down-regulated in SW480 cells ( 0.36±0.18, <0.001). Knockdown of miR-451 promoted proliferation, and migration of SW480 cells. Compared with that in FHC cells, MIF expression was up-regulated in SW480 cells (2.28±0.45, <0.001). MIF down-regulation inhibited SW480 cell proliferation, invasion and migration. MiR-451 specifically bind to the MIF 3'UTR and regulated the expression of MIF. Overexpression of miR-451 reduced while overexpression of MIF increased the viability of SW480 cells. Overexpression of MIF promoted the proliferation and migration of SW480 cells (<0.01), reversed the effect of miR-451 suppressed proliferation and migration of SW480 cells. MiR-451 may regulate proliferation and migration of human colorectal cancer cells by targeting MIF.