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Free intraglomerular malarial antigens
Abstract:
Infection with Plasmodium berghei leads to a rapidly lethal disease in different strains of mice. Nude athymic mice are not able to produce circulating antibodies (IgG or IgM) against plasmodial antigens. Nevertheless, plasmodium-related antigens can be detected in the glomeruli of nude mice, in relation to the rising parasitaemia. This deposition is unrelated to the deposition of other immunoreactants (IgG, IgM or C3). The presence of the latter as well as the circulating auto-antibodies did not correlate with the intercurrent infection and control and experimental animals behaved likewise. These results indicate an intraglomerular localization of free malarial antigens. It is suggested that this may represent a basic mechanism for in situ formation of immune complexes in immunocompetent mice.
Insights
Nude mice infected with Plasmodium berghei show malarial antigens in their glomeruli, even without antibody production. This suggests free malarial antigens deposit in the kidney, potentially forming immune complexes in other mice.
Area of Science:
- Immunology
- Parasitology
- Nephrology
Background:
- Plasmodium berghei infection causes lethal disease in mice.
- Nude athymic mice lack circulating antibodies (IgG, IgM) but can be used to study antigen deposition.
Purpose of the Study:
- To investigate the localization of Plasmodium berghei antigens in the kidneys of nude mice.
- To determine if kidney antigen deposition is related to antibody production or other immunoreactants.
Main Methods:
- Infection of nude athymic mice with Plasmodium berghei.
- Detection of plasmodium-related antigens in glomeruli via immunofluorescence.
- Assessment of other immunoreactants (IgG, IgM, C3) and auto-antibodies.
Main Results:
- Plasmodium-related antigens were detected in the glomeruli of infected nude mice.
- Antigen deposition correlated with rising parasitemia and was independent of IgG, IgM, or C3 deposition.
- No correlation was found between auto-antibodies or other immunoreactants and the infection course.
Conclusions:
- Free malarial antigens can localize within the glomeruli of mice lacking antibody production.
- This intraglomerular antigen deposition may be a precursor to in situ immune complex formation in immunocompetent hosts.