Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/194750
Type: Artigo de periódico
Title: Catalases And Thioredoxin Peroxidase Protect Saccharomyces Cerevisiae Against Ca(2+)-induced Mitochondrial Membrane Permeabilization And Cell Death.
Author: Kowaltowski, A J
Vercesi, A E
Rhee, S G
Netto, L E
Abstract: The involvement of reactive oxygen species in Ca(2+)-induced mitochondrial membrane permeabilization and cell viability was studied using yeast cells in which the thioredoxin peroxidase (TPx) gene was disrupted and/or catalase was inhibited by 3-amino-1,2, 4-triazole (ATZ) treatment. Wild-type Saccharomyces cerevisiae cells were very resistant to Ca(2+) and inorganic phosphate or t-butyl hydroperoxide-induced mitochondrial membrane permeabilization, but suffered an immediate decrease in mitochondrial membrane potential when treated with Ca(2+) and the dithiol binding reagent phenylarsine oxide. In contrast, S. cerevisiae spheroblasts lacking the TPx gene and/or treated with ATZ suffered a decrease in mitochondrial membrane potential, generated higher amounts of hydrogen peroxide and had decreased viability under these conditions. In all cases, the decrease in mitochondrial membrane potential could be inhibited by ethylene glycol-bis(beta-aminoethyl ether) N,N, N',N'-tetraacetic acid, dithiothreitol or ADP, but not by cyclosporin A. We conclude that TPx and catalase act together, maintaining cell viability and protecting S. cerevisiae mitochondria against Ca(2+)-promoted membrane permeabilization, which presents similar characteristics to mammalian permeability transition.
Subject: Adenosine Diphosphate
Amitrole
Calcium
Catalase
Cell Division
Dithiothreitol
Egtazic Acid
Enzyme Inhibitors
Intracellular Membranes
Membrane Potentials
Mitochondria
Mutation
Neoplasm Proteins
Permeability
Peroxidases
Peroxiredoxins
Saccharomyces Cerevisiae
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/10812070
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
pmed_10812070.pdf148.07 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.