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Registros recuperados: 6
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Effects of oxysterols on cell viability, inflammatory cytokines, VEGF, and reactive oxygen species production on human retinal cells: cytoprotective effects and prevention of VEGF secretion by resveratrol Inra
Dugas, B.; Charbonnier, S.; Baarine, M.; Ragot, K.; Delmas, D.; Menetrier, F.; Lherminier, J.; Malvitte, L.; Khalfaoui, T.; Bron, A.; Creuzot Garcher, C.; Latruffe, N.; Lizard, G..
Background and aimsOxysterols are assumed to play important roles in age-related macular degeneration, a major cause of blindness. So we characterized the cytotoxic, oxidative, inflammatory, and angiogenic activities of oxysterols (7β-hydroxycholesterol (7β-OH), 7-ketocholesterol (7KC), 25-hydroxycholesterol (25-OH)) in human retinal ARPE-19 cells, and evaluated the protective effects of resveratrol (Rsv: 1 μM), a polyphenol from red wine.MethodsARPE-19 cells were treated with 7β-OH, 7KC, or 25-OH (5–40 μg/mL; 24–48 h) without or with Rsv. Cell viability was determined using trypan blue and the MTT assay. Cell death was characterized by electron microscopy and in situ detection of activated caspases with fluorochrome-labeled inhibitors of caspases....
Tipo: Journal Article Palavras-chave: CELLULES RÉTINIENNES; DEGENERESCENCE MACULAIRE; DMLA ARPE-19 CELLS; CASPASE-INDEPENDENT CELL DEATH; INFLAMMATORY CYTOKINES; OXYSTEROLS; PHOSPHOLIPIDOSIS; RESVERATROL; REACTIVE OXYGEN SPECIES; VEGF.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201135a1139e&uri=/notices/prodinra1/2011/06/
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Evaluation of the ability of antioxidants to counteract lipid oxidation: existing methods, new trends and challenges Inra
Laguerre, M.; Lecomte, J.; Villeneuve, P..
Oxidative degradation of lipids, especially that induced by reactive oxygen species (ROS), leads to quality deterioration of foods and cosmetics and could have harmful effects on health. Currently, a very promising way to overcome this is to use vegetable antioxidants for nutritional, therapeutic or food quality preservation purposes. A major challenge is to develop tools to assess the antioxidant capacity and real efficacy of these molecules. Many rapid in vitro tests are now available, but they are often performed in dissimilar conditions and different properties are thus frequently measured. The so-called ‘direct’ methods, which use oxidizable substrates, seem to be the only ones capable of measuring real antioxidant power. Some oxidizable substrates...
Tipo: Journal Article Palavras-chave: CAPACITE ANTIOXYDANTE ANTIOXIDANTS; ANTIOXIDANT CAPACITY; LIPID OXIDATION; LIPIDIC OXIDIZABLE SUBSTRATE; REACTIVE OXYGEN SPECIES.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200886865968&uri=/notices/prodinra1/2009/03/
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Impact of chloroplastic- and extracellular-sourced ROS on high light-responsive gene expression in Arabidopsis Inra
Bechtold, U.; Richard, O.; Zamboni, A.; Gapper, C.; Geisler, M.; Pogson, B.; Karpinski, S.; Mullineaux, P.M..
The expression of 28 high light (HL)-responsive genes of Arabidopsis was analysed in response to environmental and physiological factors known to influence the expression of the HL-responsive gene, ASCORBATE PEROXIDASE2 (APX2). Most (81%) of the HL-responsive genes, including APX2, required photosynthetic electron transport for their expression, and were responsive to abscisic acid (ABA; 68%), strengthening the impression that these two signals are crucial in the expression of HL-responsive genes. Further, from the use of mutants altered in reactive oxygen species (ROS) metabolism, it was shown that 61% of these genes, including APX2, may be responsive to chloroplast-sourced ROS. In contrast, apoplastic/plasma membrane-sourced H2O2, in part directed by the...
Tipo: Journal Article Palavras-chave: CHLOROPLAST; EXCESS LIGHT; GENE EXPRESSION; PLASMA MEMBRANE; REACTIVE OXYGEN SPECIES; SIGNALLING.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200950d31e9d&uri=/notices/prodinra1/2010/08/
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New insights into the roles of ethylene and jasmonic acid in the acquisition of selenium resistance in plants Inra
Tamaoki, M.; Freeman, J.L.; Marquès, L.; Pilon-Smits, E.A.H..
In a recent paper, we reported that both ethylene and jasmonic acid (JA) are important for selenium (Se) resistance in Arabidopsis.Elevated levels of reactive oxygen species were associated with ethylene and JA production in a Se-resistant Arabidopsis ecotype.Here, we further discuss the functions of these phytohormones, and their possible interactions, in plant Se resistance and -accumulation,placing our data in a broader perspective of other recently published papers.
Tipo: Journal Article Palavras-chave: ARABIDOPSIS THALIANA; ETHYLENE; JASMONIC ACID; REACTIVE OXYGEN SPECIES; SELENIUM.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200942d0ed4c&uri=/notices/prodinra1/2009/03/
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Stimulus-induced down-regulation of root water transport involves reactive oxygen species-activated cell signaling and plasma membrane intrinsic protein internalization Inra
Boursiac, Y.; Boudet, J.; Postaire, O.; Luu, D.T.; Tournaire-Roux, C.; Maurel, C..
The water uptake capacity of plants roots (i.e. their hydraulic conductivity, Lp(r)) is determined in large part by aquaporins of the Plasma membrane Intrinsic Protein (PIP) sub-family. In the present work, we investigated two stimuli, salicylic acid (SA) and salt, because of their ability to induce in Arabidopsis roots a concomitant accumulation of reactive oxygen species (ROS) and inhibition of Lp(r). Inhibition of Lp(r) by SA was partially counteracted by preventing the accumulation of hydrogen peroxide (H(2)O(2)) with exogenous catalase. In addition, exogenous H(2)O(2) was able to reduce Lp(r) by up to 90% in <15 min. Based on the lack of effects of H(2)O(2) on the activity of individual aquaporins in Xenopus oocytes and on a pharmacological...
Tipo: Journal Article Palavras-chave: AQUAPORIN; STRESS; REACTIVE OXYGEN SPECIES; SALICYLIC ACID; SALT; ROOT.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009897a6846&uri=/notices/prodinra1/2009/03/
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The iron-responsive element (IRE)/iron-regulatory protein 1 (IRP1)-cytosolic aconitase iron-regulatory switch does not operate in plants. Inra
Arnaud, N.; Ravet, K.; Borlotti, A.; Touraine, B.; Boucherez, J.; Fizames, C.; Briat, J.F.; Cellier, F.; Gaymard, F..
Animal cytosolic ACO (aconitase) and bacteria ACO are able to switch to RNA-binding proteins [IRPs (iron-regulatory proteins)],thereby playing a key role in the regulation of iron homoeostasis. In the model plant Arabidopsis thaliana, we have identified three IRP1 homologues, named ACO1-3. To determine whether or not they may encode functional IRP proteins and regulate iron homoeostasis in plants, we have isolated loss-of-function mutants in the three genes. The aco1-1 and aco3-1 mutants show a clear decrease in cytosolic ACO activity. However, none of the mutants is affected in respect of the accumulation of the ferritin transcript or protein in response to iron excess. cis-acting elements potentially able to bind to the IRP have been searched for in...
Tipo: Journal Article Palavras-chave: IRT1; CYTOSOLIC ACONITASE; FERRITIN; IRON HOMEOSTASIS; IRON-REGULATORY PROTEIN 1; REACTIVE OXYGEN SPECIES; ROS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007f7c8f204&uri=/notices/prodinra1/2007/09/
Registros recuperados: 6
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