The herbicide 2,4-dichlorophenoxyacetic acid induces the generation of free-radicals and associated oxidative stress responses in yeast.
Identifieur interne : 000E41 ( Main/Exploration ); précédent : 000E40; suivant : 000E42The herbicide 2,4-dichlorophenoxyacetic acid induces the generation of free-radicals and associated oxidative stress responses in yeast.
Auteurs : Miguel C. Teixeira [Portugal] ; João P. Telo ; Nuno F. Duarte ; Isabel Sá-CorreiaSource :
- Biochemical and biophysical research communications [ 0006-291X ] ; 2004.
Descripteurs français
- KwdFr :
- Acide 2,4-dichlorophénoxy-acétique (pharmacologie), Catalase (composition chimique), Catalase (métabolisme), Facteurs temps (MeSH), Glutarédoxines (MeSH), Glutathion (métabolisme), Glutathione transferase (métabolisme), Herbicides (pharmacologie), Mutation (MeSH), Oxidoreductases (composition chimique), Oxydants (composition chimique), Piégeage de spin (méthodes), Protéines de Saccharomyces cerevisiae (composition chimique), Radicaux libres (MeSH), Relation dose-effet des médicaments (MeSH), Saccharomyces cerevisiae (effets des médicaments et des substances chimiques), Saccharomyces cerevisiae (métabolisme), Spectroscopie de résonance de spin électronique (MeSH), Stress oxydatif (MeSH), Superoxide dismutase (composition chimique), Système acellulaire (MeSH).
- MESH :
- composition chimique : Catalase, Oxidoreductases, Oxydants, Protéines de Saccharomyces cerevisiae, Superoxide dismutase.
- effets des médicaments et des substances chimiques : Saccharomyces cerevisiae.
- métabolisme : Catalase, Glutathion, Glutathione transferase, Saccharomyces cerevisiae.
- méthodes : Piégeage de spin.
- pharmacologie : Acide 2,4-dichlorophénoxy-acétique, Herbicides.
- Facteurs temps, Glutarédoxines, Mutation, Radicaux libres, Relation dose-effet des médicaments, Spectroscopie de résonance de spin électronique, Stress oxydatif, Système acellulaire.
English descriptors
- KwdEn :
- 2,4-Dichlorophenoxyacetic Acid (pharmacology), Catalase (chemistry), Catalase (metabolism), Cell-Free System (MeSH), Dose-Response Relationship, Drug (MeSH), Electron Spin Resonance Spectroscopy (MeSH), Free Radicals (MeSH), Glutaredoxins (MeSH), Glutathione (metabolism), Glutathione Transferase (metabolism), Herbicides (pharmacology), Mutation (MeSH), Oxidants (chemistry), Oxidative Stress (MeSH), Oxidoreductases (chemistry), Saccharomyces cerevisiae (drug effects), Saccharomyces cerevisiae (metabolism), Saccharomyces cerevisiae Proteins (chemistry), Spin Trapping (methods), Superoxide Dismutase (chemistry), Time Factors (MeSH).
- MESH :
- chemical , chemistry : Catalase, Oxidants, Oxidoreductases, Saccharomyces cerevisiae Proteins, Superoxide Dismutase.
- chemical , metabolism : Catalase, Glutathione, Glutathione Transferase.
- chemical , pharmacology : 2,4-Dichlorophenoxyacetic Acid, Herbicides.
- drug effects : Saccharomyces cerevisiae.
- metabolism : Saccharomyces cerevisiae.
- methods : Spin Trapping.
- Cell-Free System, Dose-Response Relationship, Drug, Electron Spin Resonance Spectroscopy, Free Radicals, Glutaredoxins, Mutation, Oxidative Stress, Time Factors.
Abstract
The pro-oxidant action of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) is demonstrated in this study using Saccharomyces cerevisiae as a eukaryotic experimental model. Evidence is presented for the generation of hydroxyl-radicals, in yeast cells suddenly exposed to 2,4-D, detected by in vivo electron paramagnetic resonance (EPR) spectroscopy using 5,5'-dimethyl-1-pyrroline N-oxide and 5-tert-butoxycarbonyl-5-methyl-1-pyrroline N-oxide as spin-traps. The intensity of the EPR spectra was dependent on the concentration of herbicide tested and was consistently higher in a mutant (Deltasod1) devoid of the cytosolic CuZn-superoxide dismutase. A time-course-dependent variation of the level of free-radical adducts was registered upon sudden exposure of an yeast cell population to concentrations of 2,4-D that lead to an initial period of viability loss, before resumption of inhibited growth by the viable adapted population. The variation pattern of the level of hydroxyl-radical adducts correlated with the one determined for the activity of Sod1p, cytosolic catalase Ctt1p, and the dithiol glutaredoxins Grx1p and Grx2p.
DOI: 10.1016/j.bbrc.2004.09.158
PubMed: 15485668
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Catalase (chemistry)</term>
<term>Catalase (metabolism)</term>
<term>Cell-Free System (MeSH)</term>
<term>Dose-Response Relationship, Drug (MeSH)</term>
<term>Electron Spin Resonance Spectroscopy (MeSH)</term>
<term>Free Radicals (MeSH)</term>
<term>Glutaredoxins (MeSH)</term>
<term>Glutathione (metabolism)</term>
<term>Glutathione Transferase (metabolism)</term>
<term>Herbicides (pharmacology)</term>
<term>Mutation (MeSH)</term>
<term>Oxidants (chemistry)</term>
<term>Oxidative Stress (MeSH)</term>
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<term>Saccharomyces cerevisiae (drug effects)</term>
<term>Saccharomyces cerevisiae (metabolism)</term>
<term>Saccharomyces cerevisiae Proteins (chemistry)</term>
<term>Spin Trapping (methods)</term>
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<term>Time Factors (MeSH)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Acide 2,4-dichlorophénoxy-acétique (pharmacologie)</term>
<term>Catalase (composition chimique)</term>
<term>Catalase (métabolisme)</term>
<term>Facteurs temps (MeSH)</term>
<term>Glutarédoxines (MeSH)</term>
<term>Glutathion (métabolisme)</term>
<term>Glutathione transferase (métabolisme)</term>
<term>Herbicides (pharmacologie)</term>
<term>Mutation (MeSH)</term>
<term>Oxidoreductases (composition chimique)</term>
<term>Oxydants (composition chimique)</term>
<term>Piégeage de spin (méthodes)</term>
<term>Protéines de Saccharomyces cerevisiae (composition chimique)</term>
<term>Radicaux libres (MeSH)</term>
<term>Relation dose-effet des médicaments (MeSH)</term>
<term>Saccharomyces cerevisiae (effets des médicaments et des substances chimiques)</term>
<term>Saccharomyces cerevisiae (métabolisme)</term>
<term>Spectroscopie de résonance de spin électronique (MeSH)</term>
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<term>Superoxide Dismutase</term>
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<term>Superoxide dismutase</term>
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<term>Mutation</term>
<term>Radicaux libres</term>
<term>Relation dose-effet des médicaments</term>
<term>Spectroscopie de résonance de spin électronique</term>
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<front><div type="abstract" xml:lang="en">The pro-oxidant action of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) is demonstrated in this study using Saccharomyces cerevisiae as a eukaryotic experimental model. Evidence is presented for the generation of hydroxyl-radicals, in yeast cells suddenly exposed to 2,4-D, detected by in vivo electron paramagnetic resonance (EPR) spectroscopy using 5,5'-dimethyl-1-pyrroline N-oxide and 5-tert-butoxycarbonyl-5-methyl-1-pyrroline N-oxide as spin-traps. The intensity of the EPR spectra was dependent on the concentration of herbicide tested and was consistently higher in a mutant (Deltasod1) devoid of the cytosolic CuZn-superoxide dismutase. A time-course-dependent variation of the level of free-radical adducts was registered upon sudden exposure of an yeast cell population to concentrations of 2,4-D that lead to an initial period of viability loss, before resumption of inhibited growth by the viable adapted population. The variation pattern of the level of hydroxyl-radical adducts correlated with the one determined for the activity of Sod1p, cytosolic catalase Ctt1p, and the dithiol glutaredoxins Grx1p and Grx2p.</div>
</front>
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<Title>Biochemical and biophysical research communications</Title>
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<ArticleTitle>The herbicide 2,4-dichlorophenoxyacetic acid induces the generation of free-radicals and associated oxidative stress responses in yeast.</ArticleTitle>
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<Abstract><AbstractText>The pro-oxidant action of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) is demonstrated in this study using Saccharomyces cerevisiae as a eukaryotic experimental model. Evidence is presented for the generation of hydroxyl-radicals, in yeast cells suddenly exposed to 2,4-D, detected by in vivo electron paramagnetic resonance (EPR) spectroscopy using 5,5'-dimethyl-1-pyrroline N-oxide and 5-tert-butoxycarbonyl-5-methyl-1-pyrroline N-oxide as spin-traps. The intensity of the EPR spectra was dependent on the concentration of herbicide tested and was consistently higher in a mutant (Deltasod1) devoid of the cytosolic CuZn-superoxide dismutase. A time-course-dependent variation of the level of free-radical adducts was registered upon sudden exposure of an yeast cell population to concentrations of 2,4-D that lead to an initial period of viability loss, before resumption of inhibited growth by the viable adapted population. The variation pattern of the level of hydroxyl-radical adducts correlated with the one determined for the activity of Sod1p, cytosolic catalase Ctt1p, and the dithiol glutaredoxins Grx1p and Grx2p.</AbstractText>
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<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Teixeira</LastName>
<ForeName>Miguel C</ForeName>
<Initials>MC</Initials>
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<MeshHeading><DescriptorName UI="D013482" MajorTopicYN="N">Superoxide Dismutase</DescriptorName>
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