MicroRNA-876-5p inhibits cell proliferation, migration and invasion by targeting c-Met in osteosarcoma

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Aberrant microRNA (miRNA) expression is implicated in human cancer progression.
• The role of miR-876-5p in osteosarcoma (OS) remains uncharacterized.

Purpose of the Study:

• To investigate the expression, function, and clinical significance of miR-876-5p in osteosarcoma.
• To elucidate the underlying molecular mechanisms of miR-876-5p in OS progression.

Main Methods:

• Quantitative real-time PCR (qRT-PCR) for miR-876-5p expression analysis in OS tissues and cell lines.
• Gain- and loss-of-function assays (transfection with miR-876-5p mimics and inhibitors) to assess cellular proliferation, migration, and invasion.
• In vivo tumor xenograft models in mice to evaluate the effect of miR-876-5p overexpression on tumor growth.
• Luciferase reporter assays to confirm c-Met as a direct target of miR-876-5p.

Main Results:

• miR-876-5p expression was significantly downregulated in OS tissues compared to adjacent normal tissues.
• Downregulation of miR-876-5p correlated with advanced clinical stage, poor differentiation, and shorter overall survival in OS patients.
• Restoration of miR-876-5p suppressed OS cell proliferation, migration, and invasion, while knockdown promoted these processes.
• Overexpression of miR-876-5p inhibited OS tumor growth in vivo.
• miR-876-5p directly targeted c-Met, reducing its expression in OS cells and tissues.
• Restoration of c-Met expression rescued the inhibitory effects of miR-876-5p on OS cell behaviors.

Conclusions:

• miR-876-5p functions as a tumor suppressor in osteosarcoma.
• miR-876-5p inhibits OS cell proliferation, migration, and invasion by targeting c-Met.
• miR-876-5p may serve as a potential therapeutic target and prognostic biomarker for osteosarcoma.