miR-429 inhibits osteosarcoma progression by targeting HOXA9 through suppressing Wnt/β-catenin signaling pathway

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Osteosarcoma (OS) is a primary bone cancer predominantly affecting children and adolescents.
• MicroRNAs (miRNAs) are increasingly recognized for their critical roles in OS pathogenesis and progression.

Purpose of the Study:

• To investigate the functional role of miR-429 in osteosarcoma progression.
• To elucidate the molecular mechanisms underlying miR-429's action in OS.

Main Methods:

• Quantitative real-time PCR (RT-qPCR) to assess miR-429 and HOXA9 expression.
• Luciferase reporter assay to confirm the direct targeting of HOXA9 by miR-429.
• MTT and Transwell assays to evaluate cell proliferation and invasion.
• Rescue assays to validate the functional relationship between miR-429 and HOXA9.
• Western blot analysis to examine Wnt/β-catenin signaling pathway activation.

Main Results:

• miR-429 was significantly downregulated in OS tissues and cell lines, while HOXA9 expression was upregulated.
• HOXA9 was identified as a direct target of miR-429.
• miR-429 suppressed OS cell proliferation and invasion, whereas HOXA9 promoted these processes.
• Overexpression of HOXA9 partially reversed the inhibitory effects of miR-429.
• miR-429 overexpression inhibited the activation of the Wnt/β-catenin signaling pathway.

Conclusions:

• miR-429 acts as a tumor suppressor in osteosarcoma.
• miR-429 inhibits OS progression by directly targeting HOXA9 and downregulating the Wnt/β-catenin pathway.