Curcumin inhibits oral squamous cell carcinoma proliferation and invasion via EGFR signaling pathways

Area of Science:

• Oncology
• Molecular Biology
• Pharmacology

Background:

• Epidermal growth factor receptor (EGFR) is a key target in anti-cancer therapies.
• Curcumin's anti-cancer effects, including EGFR downregulation, are known but its mechanism in oral squamous cell carcinoma (OSCC) is unclear.

Purpose of the Study:

• To investigate curcumin's efficacy on OSCC (SCC-25 cell line) proliferation and invasion.
• To explore curcumin's effects on EGFR activation and downstream signaling (Akt, ERK1/2, STAT3).
• To examine curcumin's inhibition of EGF-induced EGFR phosphorylation and SCC-25 cell invasion.

Main Methods:

• Cell proliferation and cell cycle analysis (G2/M phase arrest).
• Invasion assays and analysis of matrix metalloproteinases (MMP-2, MMP-9) and urokinase plasminogen activator (uPA, uPAR) expression.
• Western blot analysis to assess EGFR phosphorylation and downstream signaling molecules (p-EGFR, Akt, ERK1/2, STAT3).

Main Results:

• Curcumin inhibited SCC-25 cell proliferation and induced G2/M phase arrest dose-dependently.
• Curcumin suppressed SCC-25 cell invasion and downregulated MMP-2, MMP-9, uPA, and uPAR.
• Curcumin regulated p-EGFR and downstream signaling molecules Akt, ERK1/2, and STAT3.
• Curcumin reduced EGF-induced EGFR phosphorylation and invasion in SCC-25 cells.

Conclusions:

• Curcumin inhibits OSCC proliferation and invasion.
• Curcumin exerts its effects by inhibiting EGFR phosphorylation and downstream signaling pathways (Akt, ERK1/2, STAT3).
• Curcumin shows potential as a therapeutic agent for OSCC by targeting the EGFR pathway.