Complement components C3b and C4b as potential reliable site-specific diagnostic biomarkers for periodontitis

Area of Science:

• Immunology
• Periodontology
• Biomarker Discovery

Background:

• Periodontitis diagnosis can be informed by various biomarkers.
• Complement components C3b and C4b show positive correlation with disease severity and have been targeted therapeutically in experimental models.
• Research on the diagnostic potential of C3b and C4b expression in gingival tissues for periodontitis is limited.

Purpose of the Study:

• To investigate the correlation between C3b and C4b expression levels in human gingival tissue (GT) and gingival crevicular fluid (GCF) and periodontitis severity.
• To determine if C3b and C4b are significant site-specific diagnostic markers for periodontitis.

Main Methods:

• Immunohistochemistry and ELISA were used to measure C3b and C4b expression in GT and GCF.
• Correlation analysis was performed between C3b/C4b levels and clinical parameters (probing depth, clinical attachment level).
• Receiver operating characteristic (ROC) curve analysis evaluated diagnostic accuracy, including sensitivity and specificity.

Main Results:

• C3b and C4b expression levels in GT and GCF were significantly positively correlated with periodontitis severity.
• Combined C3b + C4b expression in GT and GCF effectively differentiated between periodontitis and healthy sites (p < .0001).

Conclusions:

• Locally deposited C3b and C4b correlate with periodontitis severity and serve as site-specific diagnostic biomarkers.
• Further understanding of the C3b/C4b network in periodontitis may lead to novel screening, diagnostic, and therapeutic strategies.