Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/15140
Title: Trypanosoma cruzi: parasite antigens sequestered in heart interstitial dendritic cells are related to persisting myocarditis in benznidazole-treated mice
Authors: Portella, Renata Siqueira
Andrade, Sonia Gumes
Affilliation: Fundação Gonçalo Moniz. Centro de Pesquisas Gonçalo Moniz. Laboratório de Chagas Experimental, Autoimunidade e Imunologia Celular. Salvador, BA, Brasil
Fundação Gonçalo Moniz. Centro de Pesquisas Gonçalo Moniz. Laboratório de Chagas Experimental, Autoimunidade e Imunologia Celular. Salvador, BA, Brasil
Abstract: We investigated whether sequestered Trypanosoma cruzi antigens found in heart interstitial dendritic cells (IDCs) contribute to the residual myocarditis found in mice following treatment with benznidazole, a specific chemotherapeutic drug. IDCs are antigen-presenting cells that are MHC-II-receptor dependent. Swiss mice were divided into two experimental groups: the 1st group was infected with the Colombian strain of T. cruzi, which is resistant to treatment with benznidazole, and the 2nd group was infected with clone 21SF-C 3, which has a medium susceptibility to the drug. Treatment of the Colombian strain group started on the 120th day post-infection and for the 21SF-C3 strain group treatment was started on the 90th day. In both groups, treatment lasted for 90 days. The animals were sacrificed either 150 or 200 days post-treatment. The myocardium was analysed by immunohistochemistry using anti-MAC3, 33D1, CD11b and CD11c monoclonal antibodies for IDCs or anti-T. cruzi purified antibodies. Parasite antigens were expressed on the IDC membranes in both treated and untreated mice. Myocarditis subsided following treatment, evidenced by both histological and morphometrical evaluation. A reduction in the number of IDCs carrying T. cruzi antigens in the treated group indicates that the elimination of parasites influences antigen presentation with concomitant decreases in inflammation. There is a correlation between the presence of T. cruzi antigens in these cells and the chronic focal, residual myocarditis seen in treated mice.
Keywords: Trypanosoma cruzi
Chronic myocarditis
Heart interstitial dendritic cells
Chemotherapy
Benznidazole
Animais
Chagas cardiomiopathy
Drug resistance
Issue Date: 2009
Publisher: Instituto Oswaldo Cruz
Citation: PORTELLA, R. S.; ANDRADE, S. G. Trypanosoma cruzi: parasite antigens sequestered in heart interstitial dendritic cells are related to persisting myocarditis in benznidazole-treated mice. Memórias do Instituto Oswaldo Cruz, v. 104, n. 7, p. 1023-1030, 2009.
ISSN: 0074-0276
Copyright: open access
Appears in Collections:BA - IGM - Artigos de Periódicos

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