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Autoimmunity in Chagas' heart disease
1Immunology Laboratory of Transplantation, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, Brazil.
Insights
Autoimmunity may drive chronic Chagas' disease heart damage, not direct parasite action. Understanding this autoimmune response is key for developing effective treatments and prevention strategies for Chagas' disease cardiopathy.
Area of Science:
- Immunology
- Pathology
- Tropical Medicine
Background:
- Chronic Chagas' disease cardiopathy shows heart lesions without detectable Trypanosoma cruzi parasites.
- Lesions are characterized by inflammatory mononuclear cell infiltrates, suggesting an immune-mediated process.
- The role of T cells and specific antigens in Chagas' disease pathogenesis remains unclear.
Purpose of the Study:
- To review evidence on autoimmunity and cross-reactivity between Trypanosoma cruzi and the host.
- To explore the effector role of T cells in Chagas' disease cardiopathy.
- To investigate the antigens triggering autoimmune responses in chronic Chagas' disease.
Main Methods:
- Literature review of published evidence on autoimmunity in Chagas' disease.
- Analysis of laboratory data concerning Trypanosoma cruzi-host interactions.
- Examination of immunological cross-reactivity between parasite antigens and heart tissue proteins.
Main Results:
- Evidence suggests an autoimmune response, potentially a delayed hypersensitivity, contributes to heart tissue damage.
- Immunological cross-reactivity between T. cruzi antigens and host proteins is hypothesized to trigger this response.
- The precise antigens and T cell roles in Chagas' disease cardiopathy pathogenesis require further elucidation.
Conclusions:
- Autoimmunity is a significant factor in the pathogenesis of chronic Chagas' disease cardiopathy.
- Identifying the autoimmune targets could lead to improved immunoprophylaxis and therapeutic strategies.
- Further research into the autoimmune mechanisms is crucial for managing Chagas' disease.
Abstract:
The time scale dissociation between high parasitemia and tissue pathology, allied to the absence of parasites in the heart lesions of chronic Chagas' disease cardiopathy, casted doubt on the direct participation of Trypanosoma cruzi in tissue lesions. Moreover, the heart tissue lesions in chronic Chagas' disease cardiopathy are associated to an inflammatory mononuclear cell infiltrate, presumably the ultimate effectors of tissue damage. It has been hypothesized that the inflammatory cell infiltrate could mediate a delayed hypersensitivity process directed to the heart tissue components, an autoimmune response triggered by immunological cross-reactivity in the course of a protective immune response against some T. cruzi antigen homologous to heart proteins. However, little is known about the effector role of the T cells in the infiltrate, or about the nature of the antigen that lead to their accumulation in tissue. In this paper, we will review the published evidence on autoimmunity and immunological cross-reactivity between T. cruzi and the mammalian host, along with data generated in our laboratory. The definition of the precise role played by autoimmunity in the pathogenesis of Chagas' disease cardiopathy may have important consequences both for immunoprophylaxis and for the therapeutic approach of chronic Chagas' disease.