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Related Experiment Video

Updated: Jun 11, 2026

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils

Published on: January 21, 2020

Complement and periodontitis.

George Hajishengallis¹

¹Department of Microbiology and Immunology, University of Louisville School of Dentistry, Loueisville, KY 40292, USA. g0haji01@louisville.edu

Biochemical Pharmacology

|July 6, 2010

Summary

The complement system plays a key role in host defense but can worsen periodontitis when overactivated. Understanding complement pathways is crucial for developing targeted therapies against this inflammatory oral disease.

Area of Science:

Immunology
Oral Biology
Pathogenesis

Background:

The complement system is vital for host defense but its dysregulation can cause immunopathology.
Periodontitis is a chronic inflammatory oral disease with systemic health implications.
Evidence suggests a link between complement system activity and periodontal disease development.

Purpose of the Study:

To review the evidence connecting the complement system to periodontal inflammation and pathogenesis.
To explore how complement activation or subversion by bacteria influences periodontitis.
To identify the precise roles of different complement pathways in periodontitis for therapeutic targeting.

Main Methods:

Review of clinical and histological observations correlating periodontal inflammation with complement activation.

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Analysis of studies on genetic polymorphisms and deficiencies in complement components related to periodontitis susceptibility.

Examination of in vitro and animal model data on periodontal bacteria's interaction with the complement cascade.

Investigation of specific bacterial mechanisms, like those of Porphyromonas gingivalis, in subverting complement signaling.

Main Results:

A correlation exists between periodontal inflammatory activity and local complement activation.
Certain genetic variations in complement components are linked to increased periodontitis susceptibility.
Periodontal bacteria, including Porphyromonas gingivalis, can modulate complement pathways to their advantage.
P. gingivalis subverts complement receptor 3 and C5a receptor signaling, promoting its survival in inflammatory environments.

Conclusions:

Complement activation and subversion contribute to periodontal pathogenesis, though not all pathways are detrimental.
Targeting the complement system for periodontitis therapy requires precise understanding of individual pathway roles.
Distinguishing between destructive and protective complement functions is essential for effective therapeutic strategies.