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Immune complex-mediated glomerulopathy in experimental Chagas' disease.
R S Costa1, R C Monteiro, A Lehuen
1INSERM U25, Hôpital Necker, Paris, France.
Clinical Immunology and Immunopathology
|January 1, 1991
Summary
Experimental Chagas' disease in mice causes chronic kidney damage (glomerulopathy). Immune complexes containing parasite antigens and rheumatoid factor contribute to this mesangial glomerulopathy.
Area of Science:
- Nephrology
- Immunology
- Infectious Diseases
Background:
- Chagas' disease, caused by Trypanosoma cruzi, can lead to chronic complications.
- Glomerulopathy is a potential manifestation of chronic Chagas' disease.
Purpose of the Study:
- To investigate the development and mechanisms of glomerulopathy in the chronic phase of experimental Chagas' disease.
- To identify the role of immune complexes in Chagas' disease-induced kidney damage.
Main Methods:
- Infection of C3H-Hej mice with Trypanosoma cruzi.
- Immunofluorescence and electron microscopy to analyze renal tissue.
- Detection and characterization of antibodies (anti-T. cruzi, rheumatoid factor) and parasite antigens in serum and renal eluates.
Main Results:
- Progressive increase in IgG, IgM, and C3 deposits in the renal mesangium over time (4-6 months post-infection).
- Co-deposition of T. cruzi antigens with immune deposits in glomeruli.
- Elevated levels of anti-T. cruzi antibodies and rheumatoid factor in renal eluates, with rheumatoid factor titers increasing over time.
- Identification of specific T. cruzi proteins involved in immune complex formation.
Conclusions:
- Experimental Chagas' disease can induce mesangial glomerulopathy during its chronic phase.
- Immune complexes, comprising parasite antigens and rheumatoid factor, are implicated in the pathogenesis of this glomerulopathy.