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Some biological activities of Eikenella corrodens major outer membrane proteins
Abstract:
Major outer membrane proteins of Eikenella corrodens, an organism frequently isolated from patients with periodontal disease, were tested for some biological activities. Mouse peritoneal macrophages, exposed at low concentrations of the above-mentioned proteins (between 0.05 and 5 micrograms/ml), showed evident and marked morphological modifications consisting of increases in the size and vacuolation of the cells. Higher concentrations showed a toxic effect. Low concentrations resulted in a selective release of lysosomal enzymes without any significant release of lactatedehydrogenase, and cytoplasmic marker; while concentrations of 25-50 micrograms/ml, which were toxic in trypan-blue exclusion test, increased LDH release. Eikenella corrodens major proteins increased the platelet aggregation of ADP and thrombin. The residual complement activity of serum samples incubated with various amounts of proteins at 37 degrees C for 30 minutes appeared strongly reduced with respect to controls, thus showing a consumption of the complement components. These results suggested that Eikenella corrodens major proteins may play a role in the development of periodontal lesions.
Insights
Major outer membrane proteins from Eikenella corrodens, linked to periodontal disease, alter immune cells and promote inflammation. These proteins may contribute to the progression of periodontal lesions.
Area of Science:
- Microbiology
- Immunology
- Periodontology
Background:
- Eikenella corrodens is frequently isolated from patients with periodontal disease.
- Outer membrane proteins are key virulence factors in bacterial pathogenesis.
Purpose of the Study:
- To investigate the biological activities of major outer membrane proteins from Eikenella corrodens.
- To determine the role of these proteins in the pathogenesis of periodontal disease.
Main Methods:
- Exposure of mouse peritoneal macrophages to varying concentrations of E. corrodens outer membrane proteins.
- Assessment of cellular morphology, lysosomal enzyme release, and lactate dehydrogenase (LDH) release.
- Evaluation of platelet aggregation and complement activity in serum samples.
Main Results:
- Low protein concentrations induced macrophage morphological changes and selective lysosomal enzyme release.
- Higher concentrations exhibited cytotoxicity, evidenced by LDH release and trypan-blue exclusion.
- E. corrodens proteins enhanced platelet aggregation and significantly reduced serum complement activity.
Conclusions:
- Eikenella corrodens major outer membrane proteins possess significant biological activities.
- These proteins may contribute to the inflammatory processes and tissue damage observed in periodontal lesions.