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Indoleamine 2,3-dioxigenase (IDO) is critical for host resistance against Trypanosoma cruzi.

Authors
  • Knubel, Carolina Paola
  • Martínez, Fernando Fabián
  • Fretes, Ricardo E
  • Díaz Lujan, Cintia
  • Theumer, Martín Gustavo
  • Cervi, Laura
  • Motrán, Claudia Cristina
Type
Published Article
Journal
The FASEB Journal
Publisher
Federation of American Society for Experimental Biology
Publication Date
Aug 01, 2010
Volume
24
Issue
8
Pages
2689–2701
Identifiers
DOI: 10.1096/fj.09-150920
PMID: 20233946
Source
Medline
License
Unknown

Abstract

Indoleamine 2,3-dioxygenase (IDO) is an inflammatory cytokine-inducible rate-limiting enzyme of the tryptophan (Trp) catabolism, which is involved in the inhibition of intracellular pathogen replication as well as in immunomodulation. Here we demonstrated the effect of IDO-dependent Trp catabolism on Trypanosoma cruzi resistance to acute infection. Infection with T. cruzi resulted in the systemic activation of IDO. The blocking of IDO activity in vivo impaired resistance to the infection and exacerbated the parasite load and infection-associated pathology. In addition, IDO activity was critical to controlling the parasite's replication in macrophages (Mos), despite the high production of nitric oxide produced by IDO-blocked T. cruzi-infected Mos. Analysis of the mechanisms by which IDO controls the parasite replication revealed that T. cruzi amastigotes were sensitive to L-kynurenine downstream metabolites 3-hydroxykynurenine (3-HK) and 3-hydroxyanthranilic acid, while 3-HK also affected the trypomastigote stage. Finally, 3-HK treatment of mice acutely infected with T. cruzi was able to control the parasite and to improve the survival of lethally infected mice. During infection, IDO played a critical role in host defense against T. cruzi; therefore, the intervention of IDO pathway could be useful as a novel antitrypanosomatid therapeutic strategy.

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