Comparative Transcriptome Analysis Identifies Desmoglein-3 as a Potential Oncogene in Oral Cancer Cells

Area of Science:

• Molecular Biology
• Oncology
• Cell Biology

Background:

• The role of desmoglein-3 (DSG3) in cancer development, particularly oral cancer, remains largely undefined.
• Understanding DSG3's molecular functions is crucial for identifying potential therapeutic targets in oral squamous cell carcinoma.

Purpose of the Study:

• To investigate the molecular mechanisms underlying DSG3's role in oral cancer.
• To identify key genes and biological pathways associated with DSG3 expression in oral squamous carcinoma cells.

Main Methods:

• Comparative transcriptome analysis using RNA-sequencing of DSG3-overexpressing and control oral cancer cell lines (H413).
• Bioinformatic analysis including gene ontology (GO) analysis to identify associated biological processes.
• Validation of gene expression using RT-qPCR, Western blotting, and immunofluorescence.
• Transmission electron microscopy to assess desmosome morphology.

Main Results:

• 599 differentially expressed genes were identified, with 12 showing high significance (9 upregulated, 3 downregulated) in DSG3-overexpressing cells.
• Genes such as MMP-13, KRT84, OLFM4, GJA1, AMOT, and ADAMTS1 were strongly associated with DSG3 overexpression.
• DSG3-associated genes are involved in critical cellular functions including junction assembly, focal adhesion, extracellular matrix formation, and keratinocyte differentiation.
• DSG3 overexpression led to slightly immature desmosome structures without altering frequency or diameter.

Conclusions:

• DSG3 expression is linked to significant molecular alterations in oral squamous carcinoma cells.
• These alterations affect cellular processes vital for cell communication, motility, and survival, suggesting a potential oncogenic role for DSG3.
• The study provides insights into the complex involvement of DSG3 in oral cancer progression.