MiR-145 inhibits osteosarcoma cells proliferation and invasion by targeting ROCK1

Area of Science:

• Molecular Biology
• Oncology
• Biochemistry

Background:

• MicroRNAs (miRNAs) are crucial regulators implicated in human cancer development.
• Osteosarcoma (OS) is a primary bone malignancy with significant metastatic potential.

Purpose of the Study:

• To investigate the role of miR-145 in osteosarcoma.
• To identify the direct functional target of miR-145 in OS cells.

Main Methods:

• Quantitative real-time PCR to assess miR-145 expression in OS tissues and cell lines.
• Cell proliferation, migration, and invasion assays in MG-63 cells with enforced miR-145 expression.
• Western blotting and luciferase reporter assays to validate ROCK1 as a direct target of miR-145.
• Correlation analysis between miR-145 and ROCK1 expression in OS tissues.

Main Results:

• miR-145 expression was significantly downregulated in osteosarcoma tissues and cell lines compared to normal controls.
• Overexpression of miR-145 suppressed proliferation, migration, and invasion of MG-63 osteosarcoma cells.
• Rho-associated protein kinase 1 (ROCK1) was identified as a direct functional target of miR-145 in OS.
• Silencing ROCK1 mimicked the tumor-suppressive effects of miR-145, and ROCK1 expression was inversely correlated with miR-145 levels in OS tissues.

Conclusions:

• miR-145 functions as a tumor suppressor in osteosarcoma.
• The miR-145/ROCK1 axis plays a critical role in regulating osteosarcoma progression.
• Targeting the miR-145 pathway may offer a therapeutic strategy for osteosarcoma.