Release of the cytosolic tryparedoxin peroxidase into the incubation medium and a different profile of cytosolic and mitochondrial peroxiredoxin expression in H2O2-treated Trypanosoma cruzi tissue culture-derived trypomastigotes.
Exp Parasitol
; 133(3): 287-93, 2013 Mar.
Article
en En
| MEDLINE
| ID: mdl-23266485
ABSTRACT
Trypanosoma cruzi antioxidant enzymes are among the factors that guarantee parasite survival and maintain infection, enabling T. cruzi to cope with oxidative stress. Herein, the expression of cytosolic (TcCPx) and mitochondrial (TcMPx) tryparedoxin peroxidases was evaluated in tissue culture-derived trypomastigotes upon incubation with different concentrations of H(2)O(2). TcCPx expression slightly increased (5.4%) in cells submitted to 10 µM H(2)O(2) treatment when compared to the control, but decreased when higher H(2)O(2) concentrations (20-50 µM) were employed. Under these conditions, TcMPx expression increased (â¼53%) with 10 µM-treatment compared to the control, followed by a reduction that reached â¼46% of the control when using the highest concentration tested. Interestingly, in the supernatant of the incubations, TcCPx, but not TcMPx, was detected, and its levels increased concomitantly with its decreased expression in the intracellular compartment. Our data show that peroxiredoxins in the tissue culture-derived trypomastigote can be modulated under oxidative stress and are present in higher amounts when compared to the epimastigote stage of T. cruzi. Additionally, due to the different expression patterns observed upon H(2)O(2)-treatment, each peroxiredoxin may play a distinct role in protecting the parasite under oxidative stress conditions.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Peroxidasas
/
Trypanosoma cruzi
/
Proteínas Protozoarias
/
Estrés Oxidativo
/
Peroxirredoxinas
/
Peróxido de Hidrógeno
Idioma:
En
Revista:
Exp Parasitol
Año:
2013
Tipo del documento:
Article
País de afiliación:
Brasil