E2F1 silencing inhibits migration and invasion of osteosarcoma cells via regulating DDR1 expression

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Osteosarcoma is a primary bone malignancy with high metastatic potential.
• Understanding the molecular mechanisms driving osteosarcoma progression is crucial for developing effective therapies.

Purpose of the Study:

• To investigate the role of E2F1 and discoidin domain receptor 1 (DDR1) in osteosarcoma cell migration and invasion.
• To elucidate the underlying molecular pathway involving E2F1, DDR1, and STAT3 in osteosarcoma progression.

Main Methods:

• Gene silencing (knockdown) and overexpression techniques in osteosarcoma cell lines.
• Luciferase and Chromatin Immunoprecipitation (ChIP) assays to confirm transcriptional regulation.
• Analysis of epithelial-mesenchymal transition (EMT) markers and STAT3 signaling.
• Correlation analysis of E2F1 and DDR1 expression with clinical parameters in patient tissues.

Main Results:

• E2F1 knockdown significantly impaired osteosarcoma cell migration and invasion by decreasing DDR1 expression.
• DDR1 plays a critical role in cell motility and invasiveness, with its overexpression enhancing these processes.
• The E2F1/DDR1 pathway inactivation suppressed STAT3 signaling and reversed EMT, indicated by altered vimentin, MMP2, MMP9, and E-cadherin levels.
• High E2F1 and DDR1 expression in osteosarcoma tissues correlated with advanced TNM stage, metastasis, and poor patient prognosis.

Conclusions:

• The E2F1/DDR1/STAT3 signaling axis is a key driver of osteosarcoma malignancy.
• E2F1 and DDR1 serve as potential prognostic biomarkers for osteosarcoma.
• Targeting the E2F1/DDR1/STAT3 pathway presents a promising therapeutic strategy for osteosarcoma.