Regulatory T cells phenotype in different clinical forms of Chagas' disease
| Autor: | Renato Sathler-Avelar, Juliana A. S. Gomes, Manoel Otávio da Costa Rocha, Fernanda Fortes de Araújo, Rodrigo Correa-Oliveira, Andréa Teixeira-Carvalho, Paulo R. Z. Antas, R.T. Pinho, Danielle Marquete Vitelli-Avelar, Olindo Assis Martins-Filho, Silvana Maria Elói-Santos |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
lcsh:Arctic medicine. Tropical medicine
lcsh:RC955-962 Trypanosoma cruzi Population Immunology/Immunomodulation chemical and pharmacologic phenomena Review Biology T-Lymphocytes Regulatory Immune tolerance Immunophenotyping Immune system Antigen Antigens CD Immune Tolerance Cytotoxic T cell Humans Chagas Disease education education.field_of_study CD40 lcsh:Public aspects of medicine Public Health Environmental and Occupational Health Infectious Diseases/Protozoal Infections FOXP3 lcsh:RA1-1270 hemic and immune systems Infectious Diseases Immunology biology.protein |
| Zdroj: | PLoS Neglected Tropical Diseases PLoS Neglected Tropical Diseases, Vol 5, Iss 5, p e992 (2011) |
| ISSN: | 1935-2735 |
| Popis: | CD25(High) CD4+ regulatory T cells (Treg cells) have been described as key players in immune regulation, preventing infection-induced immune pathology and limiting collateral tissue damage caused by vigorous anti-parasite immune response. In this review, we summarize data obtained by the investigation of Treg cells in different clinical forms of Chagas' disease. Ex vivo immunophenotyping of whole blood, as well as after stimulation with Trypanosoma cruzi antigens, demonstrated that individuals in the indeterminate (IND) clinical form of the disease have a higher frequency of Treg cells, suggesting that an expansion of those cells could be beneficial, possibly by limiting strong cytotoxic activity and tissue damage. Additional analysis demonstrated an activated status of Treg cells based on low expression of CD62L and high expression of CD40L, CD69, and CD54 by cells from all chagasic patients after T. cruzi antigenic stimulation. Moreover, there was an increase in the frequency of the population of Foxp3+ CD25(High)CD4+ cells that was also IL-10+ in the IND group, whereas in the cardiac (CARD) group, there was an increase in the percentage of Foxp3+ CD25(High) CD4+ cells that expressed CTLA-4. These data suggest that IL-10 produced by Treg cells is effective in controlling disease development in IND patients. However, in CARD patients, the same regulatory mechanism, mediated by IL-10 and CTLA-4 expression is unlikely to be sufficient to control the progression of the disease. These data suggest that Treg cells may play an important role in controlling the immune response in Chagas' disease and the balance between regulatory and effector T cells may be important for the progression and development of the disease. Additional detailed analysis of the mechanisms on how these cells are activated and exert their function will certainly give insights for the rational design of procedure to achieve the appropriate balance between protection and pathology during parasite infections. |
| Databáze: | OpenAIRE |
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