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Cytokine profiles during experimental Chagas' disease
M J Morato1, D G Colley, M R Powell
1Laboratório de Imunologia Celular e Molecular, Centro de Pesquisas René Rachou, FIOCRUZ, Belo Horizonte, Brasil.
Summary
DBA/2 mice infected with Trypanosoma cruzi show enhanced immune responses, including higher cytokine production, correlating with severe cardiomyopathy. B10.D2 mice exhibit a different immune profile, suggesting distinct immunological parameters influence Chagas disease severity.
Area of Science:
- Immunology
- Parasitology
- Cardiovascular Research
Background:
- Trypanosoma cruzi infection leads to Chagas disease, with variable cardiomyopathy development.
- Murine models (DBA/2 vs. B10.D2) display differential susceptibility to T. cruzi-induced cardiac damage.
Purpose of the Study:
- To investigate immunological differences, specifically cytokine production, between susceptible (DBA/2) and resistant (B10.D2) mice during T. cruzi infection.
- To correlate these immune changes with the severity of cardiac pathology.
Main Methods:
- Comparison of spleen cell cytokine production (IFN-gamma, IL-10, IL-4) after Concanavalin A stimulation in acute and chronic T. cruzi infection phases.
- Assessment of spleen cell proliferative responses to Con A stimulation.
- Correlation of immunological data with observed cardiomyopathy.
Main Results:
- DBA/2 mice maintained high IFN-gamma production in chronic infection, unlike B10.D2 mice.
- DBA/2 mice showed significantly higher IL-10 and IL-4 production, especially in the acute phase.
- Elevated IL-4 levels persisted and increased in chronic DBA/2 infection.
- DBA/2 mice exhibited significantly higher spleen cell proliferation in both infection phases.
Conclusions:
- Enhanced immune responses, including elevated cytokines and proliferation, in DBA/2 mice correlate with severe cardiomyopathy.
- These immune differences may be linked to parasite burden, impaired down-regulation, or autoimmune processes.
- The study highlights key immunological parameters influencing Chagas disease pathogenesis.