miR-4458 regulates cell proliferation and apoptosis through targeting SOCS1 in triple-negative breast cancer.

Our previous study has suggested suppressor of cytokine signaling 1 (SOCS1) is associated with clinical progression and functions as an oncogenic role to regulate cell proliferation and apoptosis in triple-negative breast cancer (TNBC). Several microRNA-messenger RNA (miRNA-mRNA) relationship databases show SOCS1 is identified as a direct target gene of miRNA-4458 (miR-4458). The purpose of this study was to study the relationship between miR-4458 and SOCS1 in TNBC. In our results, miR-4458 expression was decreased in TNBC tissues and cells compared with adjacent normal tissues and normal mammary epithelial cell line, respectively. Moreover, miR-4458 directly bound to SOCS1, and negatively regulated SOCS1 mRNA and protein expression. Furthermore, miR-4458 suppressed cell proliferation and promote cell apoptosis through regulating SOCS1 in TNBC. Besides, levels of miR-4458 expression in patients with advanced clinical stage were obviously lower than in patients with early clinical stage. In conclusion, miR-4458 mediates SOCS1 to play a tumor-suppressive role in TNBC.