MiR‐379‐5p inhibits the proliferation, migration, and invasion of breast cancer by targeting KIF4A

BACKGROUND: Many studies have shown that microRNAs (miRNAs) play an essential role in gene regulation and tumor development. This study aimed to explore the expression of miR‐379‐5p and its mechanisms of affecting proliferation, migration, and invasion in breast cancer (BC). METHODS: MiRNAs and mRNAs expression data of BC and normal breast tissue samples were downloaded from the TCGA and GEO databases. qRT‐PCR was used to detect the expression of miR‐379‐5p in human normal breast epithelial cell lines and human BC cell lines. The proliferation ability of transfected cells was detected by colony formation and EdU assays. The mobility and invasion ability of transfected cells was measured by wound healing and transwell assays. The relative protein expression of transfected cells was detected by western blot. Dual luciferase reporter assay was performed to identify the targeted binding of miR‐379‐5p and KIF4A. RESULTS: MiR‐379‐5p was lowly expressed in BC tissue samples and BC cell lines. The target genes of miR‐379‐5p were involved in many cancer‐related signaling pathways. PPI analysis and the cytoHubba algorithm of Cytoscape identified 10 genes as the hub genes. Survival analysis showed that only KIF4A expression in 10 hub genes was significantly associated with the prognosis of BC patients and was significantly upregulated in BC. Overexpression of miR‐379‐5p inhibited proliferation, migration, and invasion in the BC cell line MDA‐MB‐231, which could be reversed by KIF4A. CONCLUSIONS: MiR‐379‐5p inhibits proliferation, migration, and invasion of BC by targeting KIF4A.