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Published on: July 29, 2012
Programmed T-cell death in experimental chagas disease
G A DosReis1, M E Fonseca, M F Lopes
1Department of Immunology, Instituto de Microbiologia da Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Brasil. ACBONOMO@omega.LNCC.BR
Abstract:
In mature T cells, programmed cell death is thought to serve a regulatory function by limiting both the duration and amplitude of immune responses. Programmed cell death might also be involved in immuno-pathogenesis of certain infectious diseases: recent evidence suggests that programmed T-cell death plays an important role in immune suppression during viral infections. In this article, George DosReis, Maria Evangelina Fonseca and Marcela Lopes review their findings on programmed T-cell death in experimental infection induced by the protozoan parasite Trypanosoma cruzi, the causative agent of Chagas disease. They also discuss the differential behavior of CD4(+) and CD8(+) T-cell subsets regarding programmed cell death, and same possible pathogenic aspects of host-parasite interaction, where abnormal or exaggerated programmed T-cell death could be involved.
Insights
Programmed T-cell death regulates immune responses and may cause immune suppression in infections like Chagas disease. This review examines T-cell death in Trypanosoma cruzi infections and its pathogenic role.
Area of Science:
- Immunology
- Cell Biology
- Infectious Diseases
Background:
- Programmed cell death in T cells regulates immune response duration and amplitude.
- T-cell death is implicated in the immunopathogenesis of infectious diseases, particularly viral infections, contributing to immune suppression.
- Chagas disease, caused by Trypanosoma cruzi, is a relevant model for studying programmed T-cell death in parasitic infections.
Purpose of the Study:
- To review findings on programmed T-cell death in experimental Trypanosoma cruzi infection.
- To discuss the differential roles of CD4(+) and CD8(+) T-cell subsets in programmed cell death during infection.
- To explore the pathogenic aspects of host-parasite interactions involving abnormal T-cell death.
Main Methods:
- Experimental infection models using Trypanosoma cruzi.
- Analysis of programmed cell death in T-cell subsets (CD4(+) and CD8(+)).
- Review of existing literature and research findings.
Main Results:
- Programmed T-cell death plays a significant role in the immune response to Trypanosoma cruzi.
- CD4(+) and CD8(+) T-cell subsets exhibit distinct programmed cell death patterns during infection.
- Abnormal or excessive programmed T-cell death may contribute to the pathogenesis of Chagas disease.
Conclusions:
- Programmed T-cell death is a critical factor in regulating immune responses during Trypanosoma cruzi infection.
- Understanding T-cell subset-specific death mechanisms is crucial for elucidating Chagas disease pathogenesis.
- Targeting programmed cell death pathways could offer therapeutic strategies for managing infectious diseases.
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