Related Experiment Videos
Complement factors in gingival crevice material from healthy and inflamed gingiva in humans
Insights
Inflammation in the gums activates the complement system, a part of the immune system. Key complement factors like C3 and C4 are elevated in inflamed gingival samples, indicating immune response.
Area of Science:
- Immunology
- Oral Biology
- Biochemistry
Background:
- The complement system is a crucial component of innate immunity.
- Gingival inflammation is a common oral health condition.
- Understanding local immune responses in the gingival crevice is important for diagnosing and treating periodontal diseases.
Purpose of the Study:
- To investigate the presence and levels of specific complement factors (C3, C4, C5, C3 proactivator) in gingival crevicular fluid.
- To compare complement factor levels in healthy versus chronically inflamed gingiva.
- To determine if the complement system is activated within the gingival crevice during inflammation.
Main Methods:
- Electroimmunoassays were used to quantify complement factors C3, C4, C5, and C3 proactivator.
- Gingival crevicular fluid samples were collected from individuals with healthy gingiva and patients with chronic gingivitis.
- Albumin levels were used as a reference to normalize complement factor concentrations relative to plasma levels.
- Crossed immunoelectrophoresis was employed to analyze C3 conversion in inflamed samples.
Main Results:
- Significantly higher concentrations of complement factors C3 and C4 were detected in samples from inflamed gingiva compared to healthy gingiva.
- Complement factor C5 was present in inflamed gingival samples but undetectable in healthy samples.
- Converted C3 and activated C3 proactivator were found in inflamed gingival samples, indicating complement system activation.
- While C3 levels correlated with plasma levels in healthy and inflamed gingiva, C4 levels showed a lower correlation in inflamed samples.
Conclusions:
- The findings suggest that the complement system is activated within the gingival crevice during chronic gingival inflammation.
- Elevated levels of C3, C4, and the presence of C5 indicate a local inflammatory response involving complement.
- Complement activation in gingival crevicular fluid may play a role in the pathogenesis of periodontal disease.
Abstract:
The presence and levels of complement factors C3, C4, C5, and C3 proactivator, were determined by electroimmuno assay in gingival cervice material from five individuals with healthy gingiva and from six patients with chronically inflamed gingiva. Higher concentrations of C3 and C4 were found in samples from chronically inflamed gingiva when compared to those healthy gingiva. The amount of C3 in material from healthy as well as from inflamed gingiva was related to that in plasma, when the albumin in plasma and gingival crevice material was used as a reference. The same was found for C4 in samples from healthy gingiva but in those from inflamed gingiva, the values were significantly lower when related to plasma levels. C5 could not be found in material from healthy gingiva but was present in material from inflamed gingiva. C3 proactivator was present in material from inflamed gingiva in the converted form. No C3 proactivator was found in material from healthy gingiva with the methods used. Analysis of C3 in samples from inflamed gingiva, using crossed immunoelectrophoresis, showed that C3 was converted in these samples. The results indicate that the complement system may be activated in gingival crevice material from inflamed gingiva.