Interleukin-6 regulates human ODAM gene expression in gingival epithelial cells

Area of Science:

• Oral biology
• Molecular biology
• Cell signaling

Background:

• Odontogenic ameloblast-associated protein (ODAM) is a secretory protein crucial for tooth development and epithelial adhesion.
• The junctional epithelium (JE) produces ODAM, influencing its role in maintaining oral tissue integrity.

Purpose of the Study:

• To investigate the regulatory mechanisms of ODAM gene expression in human gingival epithelial cells.
• To elucidate the role of interleukin-6 (IL-6) in modulating ODAM expression.

Main Methods:

• Human gingival epithelial cell lines (Ca9-22, Sa3, HSY) were stimulated with IL-6.
• Quantitative real-time PCR and Western blot analysis assessed ODAM mRNA and protein levels.
• Luciferase reporter assays, gel mobility shift assays, and chromatin immunoprecipitation (ChIP) identified transcription factor binding to the ODAM promoter.

Main Results:

• IL-6 significantly upregulated both ODAM mRNA and protein expression.
• IL-6 stimulation enhanced ODAM gene promoter activity.
• Specific transcription factors, including STAT3, YY1, C/EBPβ, and GATA, were shown to bind to regulatory elements in the ODAM promoter in response to IL-6.

Conclusions:

• IL-6 acts as a key regulator of ODAM gene expression in the human JE.
• The findings reveal a novel signaling pathway involving IL-6 and specific transcription factors that control ODAM production.
• This study provides insights into the molecular basis of ODAM regulation in oral epithelial cells.