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Type: Artigo de periódico
Title: Role Of Trypanosoma Cruzi Peroxiredoxins In Mitochondrial Bioenergetics.
Author: Peloso, Eduardo de Figueiredo
Vitor, Simone Cespedes
Ribeiro, Luis Henrique Gonzaga
Piñeyro, María Dolores
Robello, Carlos
Gadelha, Fernanda Ramos
Abstract: Trypanosoma cruzi cytosolic (TcCPx) and mitochondrial tryparedoxin peroxidase (TcMPx) play a fundamental role in H(2)O(2) detoxification. Herein, mitochondrial bioenergetics was evaluated in cells that overexpressed TcCPx (CPx) and TcMPx (MPx) and in pTEX. In MPx, a higher expression was observed for TcCPx, and the same correlation was true for CPx. Differences in H(2)O(2) release among the overexpressing cells were detected when the mitochondrial respiratory chain was inhibited using antimycin A or thenoyltrifluoroacetone. MPx had higher O(2) consumption rates than pTEX and CPx, especially in the presence of oligomycin. In all of the cells, the mitochondrial membrane potential and the ATP levels were similar. Because of the mild uncoupling that was observed in MPx, the presence or induction of a proton transporter in the mitochondrial membrane is suggested when TcMPx is expressed at higher levels. Our results show a possible interplay between the cytosolic and mitochondrial antioxidant systems in a trypanosomatid.
Subject: Animals
Cells, Cultured
Energy Metabolism
Membrane Potential, Mitochondrial
Trypanosoma Cruzi
Citation: Journal Of Bioenergetics And Biomembranes. v. 43, n. 4, p. 419-24, 2011-Aug.
Rights: fechado
Identifier DOI: 10.1007/s10863-011-9365-4
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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