Journal article
Comparative Effects of Superoxide Anion and Hydrogen Peroxide on Microsomal and Cytosolic Glutathione S-Transferase Activities of Rat Liver
Biological trace element research, v 134(2), pp 203-211
01 May 2010
PMID: 19629404
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Glutathione S-transferases (GSTs) are isoenzymes occurring in the cytoplasm and as integral membrane proteins. In addition to their role in drug metabolism by conjugating electrophilic and lipophilic compounds with glutathione (GSH), these enzymes display multiple functions in cells, including antioxidant action. It has been generalized that reactive oxygen species (ROS) inhibit cytosolic GSTs and activate microsomal GSTs; some evidence shows, however, that different ROS-generating systems can inhibit microsomal GST activity. We therefore tested the effect of Fe3+/ascorbate, another ROS-generating system, on cytosolic and microsomal GST activities from rat liver cytosol and microsomes, respectively, and compared it to that of hydrogen peroxide (H2O2). We found that, while both agents displayed similar inhibitory effects on cytosolic GST activity, they promoted opposite effects on microsomal GST activity. Using specific antioxidant enzymes, we corroborated that the effect of Fe3+/ascorbate involves generation of O-2(center dot-) without dismutation into H2O2. Since these ROS have physicochemical properties and redox potentials that are very distinct, their reactivity is different, and their oxidative action is likely to have different targets. We discuss how these properties are related with the oxidative potency of ROS, especially those of O-2(center dot-) and H2O2.
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Details
- Title
- Comparative Effects of Superoxide Anion and Hydrogen Peroxide on Microsomal and Cytosolic Glutathione S-Transferase Activities of Rat Liver
- Creators
- Maria Eugenia Letelier - University of ChileAlfredo Molina-Berrios - University of ChileJuan Cortes-Troncoso - University of ChileJose A. Jara-Sandoval - University of ChileAndrea Mueller - University of ChilePaula Aracena-Parks - University of Chile
- Publication Details
- Biological trace element research, v 134(2), pp 203-211
- Publisher
- Humana Press Inc
- Number of pages
- 9
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; Drexel University
- Web of Science ID
- WOS:000276344000010
- Scopus ID
- 2-s2.0-77951939385
- Other Identifier
- 991019415663504721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Biochemistry & Molecular Biology
- Endocrinology & Metabolism