Coinfection with different Trypanosoma cruzi strains interferes with the host immune response to infection

A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to factors determining the pathogenesis of Chagas disease (CD). Herein, we simultaneously investigate the contribution of both host and parasite fact...

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Published inPLoS neglected tropical diseases Vol. 4; no. 10; p. e846
Main Authors Rodrigues, Claudiney Melquíades, Valadares, Helder Magno Silva, Francisco, Amanda Fortes, Arantes, Jerusa Marilda, Campos, Camila França, Teixeira-Carvalho, Andréa, Martins-Filho, Olindo Assis, Araujo, Márcio Sobreira Silva, Arantes, Rosa Maria Esteves, Chiari, Egler, Franco, Glória Regina, Machado, Carlos Renato, Pena, Sérgio Danilo Junho, Faria, Ana Maria Caetano, Macedo, Andréa Mara
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 12.10.2010
Public Library of Science (PLoS)
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Abstract A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to factors determining the pathogenesis of Chagas disease (CD). Herein, we simultaneously investigate the contribution of both host and parasite factors during acute phase of infection in BALB/c mice infected with the JG and/or CL Brener T. cruzi strains. JG single infected mice presented reduced parasitemia and heart parasitism, no mortality, levels of pro-inflammatory mediators (TNF-α, CCL2, IL-6 and IFN-γ) similar to those found among naïve animals and no clinical manifestations of disease. On the other hand, CL Brener single infected mice presented higher parasitemia and heart parasitism, as well as an increased systemic release of pro-inflammatory mediators and higher mortality probably due to a toxic shock-like systemic inflammatory response. Interestingly, coinfection with JG and CL Brener strains resulted in intermediate parasitemia, heart parasitism and mortality. This was accompanied by an increase in the systemic release of IL-10 with a parallel increase in the number of MAC-3(+) and CD4(+) T spleen cells expressing IL-10. Therefore, the endogenous production of IL-10 elicited by coinfection seems to be crucial to counterregulate the potentially lethal effects triggered by systemic release of pro-inflammatory mediators induced by CL Brener single infection. In conclusion, our results suggest that the composition of the infecting parasite population plays a role in the host response to T. cruzi in determining the severity of the disease in experimentally infected BALB/c mice. The combination of JG and CL Brener was able to trigger both protective inflammatory immunity and regulatory immune mechanisms that attenuate damage caused by inflammation and disease severity in BALB/c mice.
AbstractList A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to factors determining the pathogenesis of Chagas disease (CD). Herein, we simultaneously investigate the contribution of both host and parasite factors during acute phase of infection in BALB/c mice infected with the JG and/or CL Brener T. cruzi strains. JG single infected mice presented reduced parasitemia and heart parasitism, no mortality, levels of pro-inflammatory mediators (TNF-α, CCL2, IL-6 and IFN-γ) similar to those found among naïve animals and no clinical manifestations of disease. On the other hand, CL Brener single infected mice presented higher parasitemia and heart parasitism, as well as an increased systemic release of pro-inflammatory mediators and higher mortality probably due to a toxic shock-like systemic inflammatory response. Interestingly, coinfection with JG and CL Brener strains resulted in intermediate parasitemia, heart parasitism and mortality. This was accompanied by an increase in the systemic release of IL-10 with a parallel increase in the number of MAC-3(+) and CD4(+) T spleen cells expressing IL-10. Therefore, the endogenous production of IL-10 elicited by coinfection seems to be crucial to counterregulate the potentially lethal effects triggered by systemic release of pro-inflammatory mediators induced by CL Brener single infection. In conclusion, our results suggest that the composition of the infecting parasite population plays a role in the host response to T. cruzi in determining the severity of the disease in experimentally infected BALB/c mice. The combination of JG and CL Brener was able to trigger both protective inflammatory immunity and regulatory immune mechanisms that attenuate damage caused by inflammation and disease severity in BALB/c mice.
A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to factors determining the pathogenesis of Chagas disease (CD). Herein, we simultaneously investigate the contribution of both host and parasite factors during acute phase of infection in BALB/c mice infected with the JG and/or CL Brener T. cruzi strains. JG single infected mice presented reduced parasitemia and heart parasitism, no mortality, levels of pro-inflammatory mediators (TNF-a, CCL2, IL-6 and IFN-g) similar to those found among naieve animals and no clinical manifestations of disease. On the other hand, CL Brener single infected mice presented higher parasitemia and heart parasitism, as well as an increased systemic release of pro-inflammatory mediators and higher mortality probably due to a toxic shock-like systemic inflammatory response. Interestingly, coinfection with JG and CL Brener strains resulted in intermediate parasitemia, heart parasitism and mortality. This was accompanied by an increase in the systemic release of IL-10 with a parallel increase in the number of MAC-3+ and CD4+ T spleen cells expressing IL-10. Therefore, the endogenous production of IL-10 elicited by coinfection seems to be crucial to counterregulate the potentially lethal effects triggered by systemic release of pro-inflammatory mediators induced by CL Brener single infection. In conclusion, our results suggest that the composition of the infecting parasite population plays a role in the host response to T. cruzi in determining the severity of the disease in experimentally infected BALB/c mice. The combination of JG and CL Brener was able to trigger both protective inflammatory immunity and regulatory immune mechanisms that attenuate damage caused by inflammation and disease severity in BALB/c mice. Chagas disease, a life-long parasitic disease caused by the flagellate protozoan Trypanosoma cruzi, was discovered a century ago by the Brazilian physician Carlos Chagas, and remains one of the most neglected tropical diseases, affecting 13 million people in Latin America. Disease is characterized by distinct clinical courses, varying from asymptomatic to severe forms with damage to heart and/or gastrointestinal tract. The causes of the different clinical manifestations are not completely understood, but they certainly involve both parasite and host features. In this study, the authors analyzed immune response of BALB/c mice to infection with two different T. cruzi populations. One of them (JG) caused low parasitism and low levels of pro-inflammatory mediators associated with no clinical manifestation of the disease. The other (CL Brener) caused severe disease, high mortality and high levels of pro-inflammatory mediators. The coinfection, however, triggered singular regulatory immune mechanism(s) that attenuated damage caused by inflammation and disease severity that are typical of the single infection with CL Brener. As mixed infection is naturally found in patients in endemic areas, these results can explain, at least in part, the complexity of the immune responses and consequently the various clinical manifestations of the disease.
A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to factors determining the pathogenesis of Chagas disease (CD). Herein, we simultaneously investigate the contribution of both host and parasite factors during acute phase of infection in BALB/c mice infected with the JG and/or CL Brener T. cruzi strains. JG single infected mice presented reduced parasitemia and heart parasitism, no mortality, levels of pro-inflammatory mediators (TNF-α, CCL2, IL-6 and IFN-γ) similar to those found among naïve animals and no clinical manifestations of disease. On the other hand, CL Brener single infected mice presented higher parasitemia and heart parasitism, as well as an increased systemic release of pro-inflammatory mediators and higher mortality probably due to a toxic shock-like systemic inflammatory response. Interestingly, coinfection with JG and CL Brener strains resulted in intermediate parasitemia, heart parasitism and mortality. This was accompanied by an increase in the systemic release of IL-10 with a parallel increase in the number of MAC-3 + and CD4 + T spleen cells expressing IL-10. Therefore, the endogenous production of IL-10 elicited by coinfection seems to be crucial to counterregulate the potentially lethal effects triggered by systemic release of pro-inflammatory mediators induced by CL Brener single infection. In conclusion, our results suggest that the composition of the infecting parasite population plays a role in the host response to T. cruzi in determining the severity of the disease in experimentally infected BALB/c mice. The combination of JG and CL Brener was able to trigger both protective inflammatory immunity and regulatory immune mechanisms that attenuate damage caused by inflammation and disease severity in BALB/c mice. Chagas disease, a life-long parasitic disease caused by the flagellate protozoan Trypanosoma cruzi , was discovered a century ago by the Brazilian physician Carlos Chagas, and remains one of the most neglected tropical diseases, affecting 13 million people in Latin America. Disease is characterized by distinct clinical courses, varying from asymptomatic to severe forms with damage to heart and/or gastrointestinal tract. The causes of the different clinical manifestations are not completely understood, but they certainly involve both parasite and host features. In this study, the authors analyzed immune response of BALB/c mice to infection with two different T. cruzi populations. One of them (JG) caused low parasitism and low levels of pro-inflammatory mediators associated with no clinical manifestation of the disease. The other (CL Brener) caused severe disease, high mortality and high levels of pro-inflammatory mediators. The coinfection, however, triggered singular regulatory immune mechanism(s) that attenuated damage caused by inflammation and disease severity that are typical of the single infection with CL Brener. As mixed infection is naturally found in patients in endemic areas, these results can explain, at least in part, the complexity of the immune responses and consequently the various clinical manifestations of the disease.
  A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to factors determining the pathogenesis of Chagas disease (CD). Herein, we simultaneously investigate the contribution of both host and parasite factors during acute phase of infection in BALB/c mice infected with the JG and/or CL Brener T. cruzi strains. JG single infected mice presented reduced parasitemia and heart parasitism, no mortality, levels of pro-inflammatory mediators (TNF-α, CCL2, IL-6 and IFN-γ) similar to those found among naïve animals and no clinical manifestations of disease. On the other hand, CL Brener single infected mice presented higher parasitemia and heart parasitism, as well as an increased systemic release of pro-inflammatory mediators and higher mortality probably due to a toxic shock-like systemic inflammatory response. Interestingly, coinfection with JG and CL Brener strains resulted in intermediate parasitemia, heart parasitism and mortality. This was accompanied by an increase in the systemic release of IL-10 with a parallel increase in the number of MAC-3+ and CD4+ T spleen cells expressing IL-10. Therefore, the endogenous production of IL-10 elicited by coinfection seems to be crucial to counterregulate the potentially lethal effects triggered by systemic release of pro-inflammatory mediators induced by CL Brener single infection. In conclusion, our results suggest that the composition of the infecting parasite population plays a role in the host response to T. cruzi in determining the severity of the disease in experimentally infected BALB/c mice. The combination of JG and CL Brener was able to trigger both protective inflammatory immunity and regulatory immune mechanisms that attenuate damage caused by inflammation and disease severity in BALB/c mice.
Author Martins-Filho, Olindo Assis
Valadares, Helder Magno Silva
Araujo, Márcio Sobreira Silva
Faria, Ana Maria Caetano
Rodrigues, Claudiney Melquíades
Macedo, Andréa Mara
Francisco, Amanda Fortes
Pena, Sérgio Danilo Junho
Arantes, Jerusa Marilda
Teixeira-Carvalho, Andréa
Arantes, Rosa Maria Esteves
Chiari, Egler
Machado, Carlos Renato
Campos, Camila França
Franco, Glória Regina
AuthorAffiliation René Rachou Research Center, Brazil
4 Departamento de Patologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
3 Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Brazil
5 Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
2 Laboratório de Imunopatologia, Núcleo de Pesquisas em Ciências Biológicas, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Ouro Preto, Brazil
1 Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/20967289$$D View this record in MEDLINE/PubMed
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ContentType Journal Article
Copyright 2010 Rodrigues et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Rodrigues CM, Valadares HMS, Francisco AF, Arantes JM, Campos CF, et al. (2010) Coinfection with Different Trypanosoma cruzi Strains Interferes with the Host Immune Response to Infection. PLoS Negl Trop Dis 4(10): e846. doi:10.1371/journal.pntd.0000846
Rodrigues et al. 2010
Copyright_xml – notice: 2010 Rodrigues et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Rodrigues CM, Valadares HMS, Francisco AF, Arantes JM, Campos CF, et al. (2010) Coinfection with Different Trypanosoma cruzi Strains Interferes with the Host Immune Response to Infection. PLoS Negl Trop Dis 4(10): e846. doi:10.1371/journal.pntd.0000846
– notice: Rodrigues et al. 2010
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ISSN 1935-2735
1935-2727
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Tue Oct 15 23:36:29 EDT 2024
IsDoiOpenAccess true
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Issue 10
Keywords Chagas Disease
Animals
Cytokines
Survival Analysis
Myocardium
Male
CD4-Positive T-Lymphocytes
Mice
Mice, Inbred BALB C
Parasitemia
Disease Models, Animal
Trypanosoma cruzi
Language English
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content type line 23
Conceived and designed the experiments: CMR HMSV ATC OAMF EC GRF CRM SDJP AMCF AMM. Performed the experiments: CMR HMSV AFF JMA CFC ATC MSSA. Analyzed the data: CMR HMSV ATC OAMF MSSA RMEA AMCF AMM. Contributed reagents/materials/analysis tools: ATC OAMF RMEA EC GRF CRM SDJP AMCF AMM. Wrote the paper: CMR HMSV AFF JMA ATC OAMF MSSA RMEA EC SDJP AMCF AMM.
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AR Vago (ref14) 2000; 156
HM Valadares (ref20) 2008; 38
M Niikura (ref38) 2010; 40
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Snippet A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to...
A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to...
  A century after the discovery of Trypanosoma cruzi in a child living in Lassance, Minas Gerais, Brazil in 1909, many uncertainties remain with respect to...
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SubjectTerms Animals
Asymptomatic
CD4-Positive T-Lymphocytes - immunology
Chagas disease
Chagas Disease - immunology
Chagas Disease - mortality
Chagas Disease - pathology
Cloning
Cytokines - blood
Disease Models, Animal
Esophagus
Heart
Immunology/Immunity to Infections
Immunology/Immunomodulation
Infections
Infectious Diseases/Neglected Tropical Diseases
Infectious Diseases/Protozoal Infections
Male
Mice
Mice, Inbred BALB C
Molecular Biology
Mortality
Myocarditis
Myocardium - pathology
Parasitemia
Parasites
Parasitic diseases
Pathogenesis
Pathology/Molecular Pathology
Protozoa
Public Health and Epidemiology/Infectious Diseases
Survival Analysis
Tropical diseases
Trypanosoma cruzi
Trypanosoma cruzi - immunology
Trypanosoma cruzi - pathogenicity
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Title Coinfection with different Trypanosoma cruzi strains interferes with the host immune response to infection
URI https://www.ncbi.nlm.nih.gov/pubmed/20967289
https://www.proquest.com/docview/1288113863
https://search.proquest.com/docview/864955279
https://pubmed.ncbi.nlm.nih.gov/PMC2953483
https://doaj.org/article/95e6da8deeb44cf396088e97fac347c4
http://dx.doi.org/10.1371/journal.pntd.0000846
Volume 4
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