Non‐coding RNA MFI2‐AS1 promotes colorectal cancer cell proliferation, migration and invasion through miR‐574‐5p/MYCBP axis

Abstract Objective Long non‐coding RNAs (lncRNAs) and microRNAs (miRNAs) play essential roles in the tumour progression. LncRNAs mostly act as competing endogenous RNAs (ceRNAs) by sponging miRNAs. This study aimed to study the association of a novel lncRNA MFI2‐AS1 with miR‐574‐5p/MYCBP axis in the development of colorectal cancer (CRC). Methods Ninety‐four CRC tissues and paired adjacent non‐tumour tissues were included in our study. The relative expression level of MFI2‐AS1 was detected, and its relationship with clinico‐pathological factors was analysed. Then, the CRC cells lines (LoVo and RKO) were transfected with MFI2‐AS1 siRNA, miR‐574‐5p mimics and inhibitors. Cell proliferation, migration, invasion, cell cycle distribution and DNA damage in response to different transfection conditions were examined. Dual‐luciferase reporter assay was performed to identify the target interactions between MFI2‐AS1 and miR‐574‐5p, miR‐574‐5p and MYCBP. Results LncRNA MFI2‐AS1 and MYCBP were up‐regulated in CRC tissues when compared with adjacent non‐tumour tissues. The expression levels of MFI2‐AS1 were significantly associated with tumour histological grade, lymph and distant metastasis, TNM stage and vascular invasion. Both MFI2‐AS1 siRNA and miR‐574‐5p mimics inhibited proliferation, migration and invasion in LoVo and RKO cells. The transfection of miR‐574‐5p inhibitor showed MFI2‐AS1 siRNA‐induced changes in CRC cells. Dual‐luciferase reporter assay revealed target interactions between MFI2‐AS1 and miR‐574‐5p, miR‐574‐5p and MYCBP. Conclusions These findings suggested that lncRNA MFI2‐AS1 and MYCBP have promoting effects in CRC tissues. LncRNA MFI2‐AS1 promoted CRC cell proliferation, migration and invasion through activating MYCBP and by sponging miR‐574‐5p.