Endothelin-1 receptors play a minor role in the protection against acute Trypanosoma cruzi infection in mice

E. Roffê, A. L S Souza, P. P. Machado, L. S. Barcelos, A. J. Romanha, F. S. Mariano, J. S. Silva, C. R. Machado, H. B. Tanowitz, M. M. Teixeira

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Chagas' disease, caused by the protozoan Trypanosoma cruzi, is a major cause of cardiovascular disability in countries where it is endemic. Damage to the heart microvasculature has been proposed to be an important factor in the pathogenesis of heart dysfunction. Endothelin-1 (ET-1) is a potent vasoconstrictor and exerts its effects via specific ETA and ETB receptors. A few studies have suggested a role for ET-1 and its receptors in the pathogenesis of Chagas' disease. We investigated the effects of treatment with bosentan, an ETA/ETB receptor antagonist, on the course of T. cruzi infection (Y strain) in C57B1/6 mice. Treatment with bosentan (100 mg kg-1 day-1) was given per os starting day 0 after infection until sacrifice. Bosentan significantly increased myocardial inflammation, with no effects on parasitemia. Although the total number of nests was similar, a lower number of intact amastigote nests was found in the heart of bosentan-treated animals. Bosentan failed to affect the infection-associated increase in the cardiac levels of the cytokines IFN-γ and TNF-α and the chemokines CCL2 /MCP-1, CCL3/MIP-1α and CCL5/ RANTES. In vitro, pre-incubation with ET-1 (0.1 μM) 4 h before infection enhanced the uptake of the parasites by peritoneal macrophages, and this effect was abrogated when macrophages were pre-treated with bosentan (1 μM) 15 min before incubation with ET-1. However, ET-1 did not alter killing of intracellular parasites after 48 h of in vitro infection. Our data suggest that bosentan-treated mice have a delay in controlling parasitism which is compensated for exacerbated inflammation. Infection is eventually controlled in these animals and lethality is unchanged, demonstrating that ET-1 plays a minor role in the protection against acute murine T. cruzi infection.

Original languageEnglish (US)
Pages (from-to)391-399
Number of pages9
JournalBrazilian Journal of Medical and Biological Research
Volume40
Issue number3
DOIs
StatePublished - Mar 2007

Fingerprint

Endothelin A Receptors
endothelins
Trypanosoma cruzi
Endothelin-1
receptors
mice
Infection
infection
Chagas disease
Chagas Disease
Macrophages
heart
Parasites
Animals
macrophages
pathogenesis
inflammation
nests
Inflammation
vasoconstrictor agents

Keywords

  • Chemokines
  • Endothelin
  • Myocarditis
  • Trypanosoma cruzi

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Medicine (miscellaneous)

Cite this

Roffê, E., Souza, A. L. S., Machado, P. P., Barcelos, L. S., Romanha, A. J., Mariano, F. S., ... Teixeira, M. M. (2007). Endothelin-1 receptors play a minor role in the protection against acute Trypanosoma cruzi infection in mice. Brazilian Journal of Medical and Biological Research, 40(3), 391-399. https://doi.org/10.1590/S0100-879X2007000300015

Endothelin-1 receptors play a minor role in the protection against acute Trypanosoma cruzi infection in mice. / Roffê, E.; Souza, A. L S; Machado, P. P.; Barcelos, L. S.; Romanha, A. J.; Mariano, F. S.; Silva, J. S.; Machado, C. R.; Tanowitz, H. B.; Teixeira, M. M.

In: Brazilian Journal of Medical and Biological Research, Vol. 40, No. 3, 03.2007, p. 391-399.

Research output: Contribution to journalArticle

Roffê, E, Souza, ALS, Machado, PP, Barcelos, LS, Romanha, AJ, Mariano, FS, Silva, JS, Machado, CR, Tanowitz, HB & Teixeira, MM 2007, 'Endothelin-1 receptors play a minor role in the protection against acute Trypanosoma cruzi infection in mice', Brazilian Journal of Medical and Biological Research, vol. 40, no. 3, pp. 391-399. https://doi.org/10.1590/S0100-879X2007000300015
Roffê, E. ; Souza, A. L S ; Machado, P. P. ; Barcelos, L. S. ; Romanha, A. J. ; Mariano, F. S. ; Silva, J. S. ; Machado, C. R. ; Tanowitz, H. B. ; Teixeira, M. M. / Endothelin-1 receptors play a minor role in the protection against acute Trypanosoma cruzi infection in mice. In: Brazilian Journal of Medical and Biological Research. 2007 ; Vol. 40, No. 3. pp. 391-399.
@article{d29a7073de7944e0bffb40b30383286e,
title = "Endothelin-1 receptors play a minor role in the protection against acute Trypanosoma cruzi infection in mice",
abstract = "Chagas' disease, caused by the protozoan Trypanosoma cruzi, is a major cause of cardiovascular disability in countries where it is endemic. Damage to the heart microvasculature has been proposed to be an important factor in the pathogenesis of heart dysfunction. Endothelin-1 (ET-1) is a potent vasoconstrictor and exerts its effects via specific ETA and ETB receptors. A few studies have suggested a role for ET-1 and its receptors in the pathogenesis of Chagas' disease. We investigated the effects of treatment with bosentan, an ETA/ETB receptor antagonist, on the course of T. cruzi infection (Y strain) in C57B1/6 mice. Treatment with bosentan (100 mg kg-1 day-1) was given per os starting day 0 after infection until sacrifice. Bosentan significantly increased myocardial inflammation, with no effects on parasitemia. Although the total number of nests was similar, a lower number of intact amastigote nests was found in the heart of bosentan-treated animals. Bosentan failed to affect the infection-associated increase in the cardiac levels of the cytokines IFN-γ and TNF-α and the chemokines CCL2 /MCP-1, CCL3/MIP-1α and CCL5/ RANTES. In vitro, pre-incubation with ET-1 (0.1 μM) 4 h before infection enhanced the uptake of the parasites by peritoneal macrophages, and this effect was abrogated when macrophages were pre-treated with bosentan (1 μM) 15 min before incubation with ET-1. However, ET-1 did not alter killing of intracellular parasites after 48 h of in vitro infection. Our data suggest that bosentan-treated mice have a delay in controlling parasitism which is compensated for exacerbated inflammation. Infection is eventually controlled in these animals and lethality is unchanged, demonstrating that ET-1 plays a minor role in the protection against acute murine T. cruzi infection.",
keywords = "Chemokines, Endothelin, Myocarditis, Trypanosoma cruzi",
author = "E. Roff{\^e} and Souza, {A. L S} and Machado, {P. P.} and Barcelos, {L. S.} and Romanha, {A. J.} and Mariano, {F. S.} and Silva, {J. S.} and Machado, {C. R.} and Tanowitz, {H. B.} and Teixeira, {M. M.}",
year = "2007",
month = "3",
doi = "10.1590/S0100-879X2007000300015",
language = "English (US)",
volume = "40",
pages = "391--399",
journal = "Brazilian Journal of Medical and Biological Research",
issn = "0100-879X",
publisher = "Associacao Brasileira de Divulgacao Cientifica",
number = "3",

}

TY - JOUR

T1 - Endothelin-1 receptors play a minor role in the protection against acute Trypanosoma cruzi infection in mice

AU - Roffê, E.

AU - Souza, A. L S

AU - Machado, P. P.

AU - Barcelos, L. S.

AU - Romanha, A. J.

AU - Mariano, F. S.

AU - Silva, J. S.

AU - Machado, C. R.

AU - Tanowitz, H. B.

AU - Teixeira, M. M.

PY - 2007/3

Y1 - 2007/3

N2 - Chagas' disease, caused by the protozoan Trypanosoma cruzi, is a major cause of cardiovascular disability in countries where it is endemic. Damage to the heart microvasculature has been proposed to be an important factor in the pathogenesis of heart dysfunction. Endothelin-1 (ET-1) is a potent vasoconstrictor and exerts its effects via specific ETA and ETB receptors. A few studies have suggested a role for ET-1 and its receptors in the pathogenesis of Chagas' disease. We investigated the effects of treatment with bosentan, an ETA/ETB receptor antagonist, on the course of T. cruzi infection (Y strain) in C57B1/6 mice. Treatment with bosentan (100 mg kg-1 day-1) was given per os starting day 0 after infection until sacrifice. Bosentan significantly increased myocardial inflammation, with no effects on parasitemia. Although the total number of nests was similar, a lower number of intact amastigote nests was found in the heart of bosentan-treated animals. Bosentan failed to affect the infection-associated increase in the cardiac levels of the cytokines IFN-γ and TNF-α and the chemokines CCL2 /MCP-1, CCL3/MIP-1α and CCL5/ RANTES. In vitro, pre-incubation with ET-1 (0.1 μM) 4 h before infection enhanced the uptake of the parasites by peritoneal macrophages, and this effect was abrogated when macrophages were pre-treated with bosentan (1 μM) 15 min before incubation with ET-1. However, ET-1 did not alter killing of intracellular parasites after 48 h of in vitro infection. Our data suggest that bosentan-treated mice have a delay in controlling parasitism which is compensated for exacerbated inflammation. Infection is eventually controlled in these animals and lethality is unchanged, demonstrating that ET-1 plays a minor role in the protection against acute murine T. cruzi infection.

AB - Chagas' disease, caused by the protozoan Trypanosoma cruzi, is a major cause of cardiovascular disability in countries where it is endemic. Damage to the heart microvasculature has been proposed to be an important factor in the pathogenesis of heart dysfunction. Endothelin-1 (ET-1) is a potent vasoconstrictor and exerts its effects via specific ETA and ETB receptors. A few studies have suggested a role for ET-1 and its receptors in the pathogenesis of Chagas' disease. We investigated the effects of treatment with bosentan, an ETA/ETB receptor antagonist, on the course of T. cruzi infection (Y strain) in C57B1/6 mice. Treatment with bosentan (100 mg kg-1 day-1) was given per os starting day 0 after infection until sacrifice. Bosentan significantly increased myocardial inflammation, with no effects on parasitemia. Although the total number of nests was similar, a lower number of intact amastigote nests was found in the heart of bosentan-treated animals. Bosentan failed to affect the infection-associated increase in the cardiac levels of the cytokines IFN-γ and TNF-α and the chemokines CCL2 /MCP-1, CCL3/MIP-1α and CCL5/ RANTES. In vitro, pre-incubation with ET-1 (0.1 μM) 4 h before infection enhanced the uptake of the parasites by peritoneal macrophages, and this effect was abrogated when macrophages were pre-treated with bosentan (1 μM) 15 min before incubation with ET-1. However, ET-1 did not alter killing of intracellular parasites after 48 h of in vitro infection. Our data suggest that bosentan-treated mice have a delay in controlling parasitism which is compensated for exacerbated inflammation. Infection is eventually controlled in these animals and lethality is unchanged, demonstrating that ET-1 plays a minor role in the protection against acute murine T. cruzi infection.

KW - Chemokines

KW - Endothelin

KW - Myocarditis

KW - Trypanosoma cruzi

UR - http://www.scopus.com/inward/record.url?scp=33947166708&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33947166708&partnerID=8YFLogxK

U2 - 10.1590/S0100-879X2007000300015

DO - 10.1590/S0100-879X2007000300015

M3 - Article

C2 - 17334537

AN - SCOPUS:33947166708

VL - 40

SP - 391

EP - 399

JO - Brazilian Journal of Medical and Biological Research

JF - Brazilian Journal of Medical and Biological Research

SN - 0100-879X

IS - 3

ER -