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• W2794304570 abstract "Excitoneurotoxicity is regarded as one of the mechanisms of the death of retinal ganglion cells induced by retinal central artery occlusion and glaucoma. Oxidative stress is at least in part involved in excitoneurotoxicity. Fenton reaction, which is catalyzed by Fe2+, is known to cause formation of hydroxyl radical, one of reactive oxygen species, suggesting that chelation of iron may be protective against excitoneurotoxicity. In the present study, we histologically evaluated whether zinc-deferoxamine (Zn-DFO) and deferasirox (DFX), common iron-chelating agents, were protective against N-methyl-D-aspartate (NMDA)-induced retinal injury in the rat in vivo. Male Sprague–Dawley rats were subjected to intravitreal NMDA injection (200 nmol/eye). Zn-DFO (1, 3, 10, and 30 mg/kg), Zn (0.1, 0.2 and 0.6 mg/kg) and DFX (20 mg/kg) were intraperitoneally administered. Morphometric evaluations using paraffin-embedded retinal sections, and detection of Fe2+ using SiRhoNox-1, a fluorescent probe of labile Fe2+ in the retinal frozen sections were carried out. Intravitreal NMDA resulted in strong positive signals of SiRhoNox-1 in the ganglion cell layer 24 h after NMDA injection, suggesting that intravitreal NMDA caused Fe2+ accumulation in the retinal ganglion cells. Intravitreal NMDA induced retinal ganglion cell loss 7 days after NMDA injection. Zn-DFO (1, 3, 10, and 30 mg/kg), ZnCl2 (0.2 mg/kg, a corresponding dose of 1 mg/kg Zn-DFO) and DFX (20 mg/kg) prevented the damage of retinal ganglion cells, whereas 0.6 mg/kg ZnCl2, which is a corresponding dose of 3 mg/kg Zn-DFO, did not show any protective effects. Zn-DFO (30 mg/kg) significantly decreased the intensity of the fluorescence of SiRhoNox-1 and the transferrin immunofluorescence 24 h after NMDA injection, the number of TUNEL-positive cells 24 h after NMDA injection, that of 8-OHdG-positive cells, and that of 4-hydroxy-2-nonenal-positive cells 12 and 24 h after NMDA injection. These data suggest that iron-chelating agents protected retinal neurons against excitoneurotoxicity via reduction of iron content and oxidative stress in the rats in vivo. We proposed that treatment with iron-chelating agents would be a new strategy for the retinal diseases caused by excitoneurotoxicity." @default.
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• W2794304570 date "2018-06-01" @default.
• W2794304570 modified "2023-10-14" @default.
• W2794304570 title "Iron-chelating agents attenuate NMDA-Induced neuronal injury via reduction of oxidative stress in the rat retina" @default.
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• W2794304570 doi "https://doi.org/10.1016/j.exer.2018.03.008" @default.
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