Growth factor-sensitive molecular targets identified in primary and metastatic head and neck squamous cell carcinoma...

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Polypeptide growth factors like TGFbeta and EGF are crucial for cell migration and invasion.
• Understanding gene expression changes in head and neck squamous cell carcinoma (HNSCC) is vital for targeting metastasis.

Purpose of the Study:

• To identify target genes modulated by TGFbeta and EGF in primary versus metastatic HNSCC cells.
• To investigate the differential gene expression profiles of HNSCC cell lines HN4 (primary) and HN12 (metastatic).

Main Methods:

• Utilized cDNA microarrays (NCI UniGem 2.0) with 9128 features to analyze gene expression.
• Treated HN4 and HN12 cell lines with EGF or TGFbeta and compared gene expression profiles.
• Validated findings using quantitative PCR, western blotting, and zymography.

Main Results:

• Metastatic HN12 cells showed constitutive overexpression of 41 genes and underexpression of 109 genes compared to HN4 cells under serum withdrawal.
• TGFbeta treatment upregulated 53 genes and downregulated 91 genes in HN12 vs. HN4.
• EGF treatment upregulated 67 genes and downregulated 113 genes in HN12 vs. HN4, with partial overlap between growth factor-modulated gene sets.

Conclusions:

• TGFbeta and EGF differentially regulate gene expression in primary and metastatic HNSCC cells.
• These growth factors likely contribute to the invasive properties of metastatic cells.
• Both common and specific mediators are regulated by TGFbeta and EGF, influencing HNSCC cell invasion.