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Constitutionally hyperreactive neutrophils in periodontitis
Margareta I Fredriksson1, Anders K Gustafsson, Kurt G Bergström
1Karolinska Institutet, Department of Odontology, Division of Periodontology, Huddinge, Sweden. margareta.fredriksson@labtek.ki.se
Journal of Periodontology
|April 2, 2003
Summary
Neutrophils in periodontitis patients show heightened oxygen radical release, particularly via the Fcgamma receptor pathway. This suggests a potential constitutional hyperresponsiveness in these immune cells, contributing to tissue damage in periodontal disease.
Area of Science:
- Immunology
- Periodontology
- Cell Biology
Background:
- Neutrophils are crucial for host defense but can cause tissue damage via oxygen radicals.
- Previous studies on neutrophil oxygen radical production in periodontitis have yielded conflicting results.
- Variations may depend on periodontitis type, activation pathway, and smoking status.
Purpose of the Study:
- To investigate neutrophil oxygen radical production in severe chronic periodontitis patients.
- To compare neutrophil responses to different activation stimuli.
- To explore potential links between neutrophil hyperreactivity and plasma inflammatory markers.
Main Methods:
- Compared neutrophils from 15 periodontitis patients and matched healthy controls (non-smokers).
- Activated neutrophils using IgG-opsonized bacteria, complement-opsonized zymosan, and phorbol myristate acetate (PMA).
- Measured total and extracellular oxygen radical release via chemiluminescence (CL); analyzed plasma inflammatory markers.
Main Results:
- Periodontitis neutrophils exhibited significantly higher CL (oxygen radical release) when activated via the Fcgamma receptor pathway.
- Elevated, though less pronounced, oxygen radical generation was observed with complement-opsonized zymosan and PMA activation.
- No significant differences were found in plasma inflammatory protein concentrations between groups.
Conclusions:
- Increased neutrophil chemiluminescence in periodontitis may stem from a constitutionally greater Fcgamma-receptor responsiveness.
- This heightened neutrophil responsiveness could contribute to tissue destruction in periodontal disease.