References of "Mathy-Hartert, Marianne"
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See detailThe unexpected hidden face of the Cephalosporin Antibiotic Ceftazidime: From biological to chemical and physical activities against oxidant species produced by phagocytes
Mouithys-Mickalad, Ange ULg; Deby-Dupont, Ginette; Mathy-Hartert, Marianne ULg et al

Conference (2008, October 03)

Background: Over several decades the use of antibiotics to treat infectious and bacterial diseases has been the main challenge. Ceftazidime (CAZ), belonging to the cephalosporin’s family, is known as ... [more ▼]

Background: Over several decades the use of antibiotics to treat infectious and bacterial diseases has been the main challenge. Ceftazidime (CAZ), belonging to the cephalosporin’s family, is known as empiric treatment for severe sepsis. Beside its antibiotic effect, CAZ has been shown to have other properties, making it unique. This study is aimed to investigate unexpected antioxidant properties of CAZ with special emphasis on the mechanism of action. Methods: Four in vitro and ex-vivo experimental models were designed 1) Assay of proteinases inhibitory activity of α2-macroglobulin (α2M) in the presence of trypsine (1.4µg) with or without 10-3 M CAZ, in 0.1 M Tris-HCl at pH 8.1. 2) Assessment of MPO-induced toxicity on endothelial cells or oxidant activities of stimulated phagocytes (PMNs) using 160 µM ferricytochrome C. 3) Effect of CAZ on two models of anoxia/reoxygenation from adherent and suspension alveolar cells (A549, 106 to 1010 cells/ml) using oxymetry coupled to EPR-spin trapping technique. 4) Cell-free systems to investigate: lipoperoxidation of linoleate induced by γ-irradiation, Fe2+/ascorbate system or ferryl species; Quenching of hydroxyl radical (·OH) and singlet oxygen (1O2)-scavenging activity from Mallet’s (H2O2/NaOCl) and Fenton’ reactions. Results: Ex-vivo assays show efficient protective effect of CAZ on plasmatic antiproteinases against oxidative stress; a dose-dependent inhibitory capacity on endothelial and A549 cells against MPO toxicity or excessive production of ROS during anoxia/reoxygenation. On cell-free systems, CAZ had unique 1O2–scavenging activity; and less effect on ferryl species. CAZ exerts its antioxidant effect by chelating activity. Conclusions: Overall results indicate that: 1) CAZ protects endothelial cells against MPO toxicity but also A549 cells towards the effect of anoxia/reoxygenation; 2) CAZ protects α2M and 3) acts as efficient inhibitor of lipid peroxidation of linoleate and hydroxyl radical and as singlet oxygen-scavengers. Antioxidant properties of CAZ might be relevant in clinical situations where excessive activation of leukocytes is known and in anoxia/reoxygenation model cause an increased production of ROS. [less ▲]

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See detailReactive oxygen species downregulate the expression of pro-inflammatry genes by humachondrocytes
Henrotin, Yves ULg; Mathy-Hartert, Marianne ULg; Martin, G. et al

in Osteoporosis International (2002, November), 13(Suppl. 3), 53

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See detailHydrogen peroxide increases transforming factor-β3 gene expression in human chondrocytes and reverses interleukin-1β inhibitory effect
Mathy-Hartert, Marianne ULg; Devel, P.; Hoormaert, S. et al

in Osteoporosis International (2002, November), 13(Suppl.3), 52

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See detailComparative effects of nimesulide, nimesulide L-lysine and nimesulide L-lysine L-arginine on human articular chondrocytes in vitro
De Leval, X.; Dogne, J. M.; Delarge, J. et al

Poster (1999, September 17)

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See detailSynthesis and evaluation of non-carboxylic pyridinic derivatives as cyclooxygenase inhibitors
Dogne, J. M.; De Leval, X.; Delarge, J. et al

Poster (1999, September 17)

Detailed reference viewed: 12 (7 ULg)