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Immune complexes in experimental alveolar hydatidosis.
Tropenmedizin Und Parasitologie
|September 1, 1983
Summary
Infection with hydatid cysts leads to immune complex accumulation in mice, potentially causing immunodepression and parasite growth. These immune complexes contain parasite antigens and host immune components.
Area of Science:
- Immunology
- Parasitology
- Infectious Diseases
Background:
- Alveolar echinococcosis, caused by Echinococcus multilocularis, is a serious parasitic infection.
- The host immune response to parasitic infections can lead to the formation of immune complexes (IC).
Purpose of the Study:
- To investigate the presence and composition of circulating immune complexes (IC) in C57BL/6J mice infected with alveolar hydatid cysts.
- To explore the relationship between IC levels, parasite burden, and host immune status.
Main Methods:
- Quantitative detection of IC using polyethylene glycol precipitation.
- Qualitative detection of IC via Raji cell binding assay.
- Analysis of IC composition using gel precipitation and indirect immunofluorescence.
Main Results:
- Significant accumulation of IC in the blood of infected mice over 16 weeks.
- IC levels correlated with larval cyst mass weight and inversely with serum complement activity.
- IC comprised Echinococcus multilocularis antigens, host immunoglobulins (IgG1, IgG2b, IgM), and complement (C3).
- Kidney sections revealed deposition of host immune components and parasite antigens.
Conclusions:
- Circulating IC play a role in the immunopathology of alveolar echinococcosis.
- IC formation may contribute to immune suppression and facilitate parasite growth.
- Further research is needed to elucidate the precise mechanisms of IC-mediated immunomodulation in this infection.