miR-557 suppressed the malignant behaviours of osteosarcoma cells by reducing HOXB9 and deactivating the EMT process

Area of Science:

• Oncology
• Molecular Biology
• Gene Regulation

Background:

• MicroRNAs (miRNAs) are crucial regulators of gene expression implicated in disease development, particularly cancer.
• Osteosarcoma, a primary bone malignancy, presents complex regulatory mechanisms requiring further investigation.

Purpose of the Study:

• To investigate the regulatory role of microRNA-557 (miR-557) and its target gene, Homeobox B9 (HOXB9), in osteosarcoma.
• To explore the potential of targeting the miR-557/HOXB9 axis for osteosarcoma therapy.

Main Methods:

• Analysis of miR-557 and HOXB9 expression in osteosarcoma tissues and cell lines using GEO datasets.
• Validation of the miR-557 and HOXB9 interaction using dual-luciferase reporter assays.
• Assessment of cell proliferation, colony formation, migration, and epithelial-mesenchymal transition (EMT) markers via cell-based assays and Western blotting.

Main Results:

• miR-557 was significantly downregulated in osteosarcoma tissues and cell lines.
• Upregulation of miR-557 suppressed osteosarcoma cell proliferation, migration, and EMT.
• HOXB9 was identified as a direct target of miR-557, with its overexpression inversely correlated with miR-557 levels and associated with poor patient prognosis.
• HOXB9 overexpression counteracted the inhibitory effects of miR-557 on tumor progression and EMT.

Conclusions:

• miR-557 functions as a tumor suppressor in osteosarcoma by targeting HOXB9.
• The miR-557/HOXB9 pathway represents a promising therapeutic target for osteosarcoma treatment.
• Modulating miR-557 offers a novel molecular strategy for osteosarcoma targeted therapy.