期刊
FREE RADICAL BIOLOGY AND MEDICINE
卷 46, 期 3, 页码 367-375出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2008.10.034
关键词
Pterins; Macrophages; Nitric oxide; Reactive oxygen species; Pteridine reductase; Free radicals
资金
- CIHIZ group
- CIHR Institute of Infection and Immunity
- Fonds de Recherche en Sante du Quebec
- Wellcome Fund
During its life cycle, the protozoan parasite Leishmania experiences oxidative stress when interacting with macrophages. Reduced pterins are known scavengers of reactive oxygen and nitrogen intermediates. Leishmania has a pteridine reductase, PTR1, whose main function is to provide reduced pterins. We investigated the role of PTR1 in resistance to oxidative and nitrosative stress in Leishmania tarentolae, Leishmania infantum, and Leishmania major PTR1(-/-) mutants. The PTR1(-/-) cells of the three species were more sensitive to H2O2- and NO-induced stress. Using a fluorescent probe allowing ROI quantification, we demonstrated an increase in intracellular oxidant molecules in the PTR1(-/-) mutants. The disruption of PTRI increased metacyclogenesis in L. infantum and L. major. We purified metacyclic parasites from PTR1(-/-) mutants and control cells and tested their intracellular survival in the J774 mouse cell line and in human monocytederived macrophages. Our results showed that PTR1(-/-) null mutants survived less in both macrophage models compared to control cells and this decrease was more pronounced in macrophages activated for oxidant production. This study demonstrates that one physiological role of reduced pterins in Leishmania is to deal with oxidative and nitrosative species, and a decreased ability to provide reduced pterins leads to decreased intracellular survival. (C) 2008 Elsevier Inc. All rights reserved.
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