Gingival transcriptome patterns during induction and resolution of experimental gingivitis in humans

Area of Science:

• Oral biology
• Immunology
• Transcriptomics

Background:

• Whole-transcriptome gene expression during experimental gingivitis in humans has not been previously explored using bioinformatic tools.
• Understanding these changes is crucial for identifying mechanisms underlying gingival inflammation and resolution.

Purpose of the Study:

• To investigate the dynamic changes in gene expression patterns during the induction and resolution of experimental gingivitis.
• To identify key biological pathways and candidate genes involved in the host response to biofilm.

Main Methods:

• Gingival biopsy samples were collected from 14 subjects at baseline, peak gingivitis (day 28), and resolution (day 35) in a stent-induced experimental gingivitis model.
• Whole-transcriptome gene-expression arrays were utilized to analyze gene profiles.
• Bioinformatic tools were employed to identify biologic themes and pathways associated with gene expression changes.

Main Results:

• The immune response was the dominant pathway, with 131 immune genes significantly altered during induction or resolution.
• Transient increases in inflammatory mediators (e.g., IL-1 alpha, IL-1 beta) and oxidative stress genes were observed during induction.
• Expression patterns of these genes reversed upon clinical resolution of gingivitis.

Conclusions:

• A small subset of immune response genes (11.9%) showed transient activation, indicating a specific transcriptome response to biofilm.
• These genes are critical for maintaining tissue homeostasis at the biofilm-gingival interface.
• Beyond the immune response, neural processes, epithelial defenses, angiogenesis, and wound healing pathways were also modulated.