MicroRNA-432-5p regulates sprouting and intussusceptive angiogenesis in osteosarcoma microenvironment by targeting...

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Osteosarcoma (OS) is a highly metastatic bone tumor.
• Tumor growth depends on angiogenesis, including sprouting angiogenesis (SA) and intussusceptive angiogenesis (IA).
• Mechanisms regulating SA and IA in OS remain unclear.

Purpose of the Study:

• Investigate the role of microRNAs (miRNAs) in OS-induced angiogenesis.
• Identify specific miRNAs involved in regulating SA and IA in OS.
• Explore the therapeutic potential of targeting identified miRNA-gene interactions.

Main Methods:

• Assessed miRNA expression profiles in OS and normal bone cells.
• Utilized miR-432-5p mimic/inhibitor for functional analysis in OS cells (MG63, SaOS2).
• Confirmed PDGFB as a direct target of miR-432-5p using luciferase reporter assay.
• Evaluated angiogenic effects in endothelial cells and chick chorioallantoic membrane (CAM) models.
• Validated findings in a zebrafish tumor xenograft model.

Main Results:

• miR-432-5p was significantly downregulated in OS cells.
• miR-432-5p directly targets and inhibits Platelet-Derived Growth Factor-B (PDGFB) expression.
• Overexpression of miR-432-5p in OS cells reduced angiogenesis.
• miR-432-5p promotes the transition from SA to IA in OS.
• Zebrafish xenograft models confirmed the role of miR-432-5p in regulating tumor angiogenesis.

Conclusions:

• miR-432-5p acts as a tumor suppressor in OS by inhibiting angiogenesis.
• The miR-432-5p/PDGFB signaling pathway is a key regulator of angiogenesis in OS.
• Targeting the miR-432-5p/PDGFB axis presents a potential therapeutic strategy for osteosarcoma.