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• W2000235997 abstract "purpose. Membrane depolarization and subsequent synaptic release of l-glutamate have been implicated in ischemic retinal damage. However, the mechanisms that lead to ischemia-induced retinal damage are poorly understood. In this study, KCl, a classic membrane depolarizing agent, was injected into the vitreous humor, and the role of matrix metalloproteinase (MMP)-9 in KCl-induced retinal damage was investigated. methods. Normal adult CD-1 mice were treated with KCl by intravitreal injection. MMP activity in retinal protein extracts was determined by gelatin zymography. Tissue localization of MMP-9 in the retina was determined by immunohistochemistry. MMP-9, MMP-2, tissue inhibitor of MMP (TIMP)-1, TIMP-2, Bax, and BCl-2 proteins in retinal extracts were determined by Western blot analysis. Apoptotic cell death in the retina was determined by TUNEL assays. Retinal damage was assessed by immunolocalization studies with antibodies against neurofilament-light (NF-L) and calretinin. results. Depolarizing concentrations of KCl induced a dose- and time-related upregulation in MMP-9 activity and protein in the retina. KCl-mediated MMP-9 upregulation was associated with an increase in proapoptotic protein Bax and apoptotic death of cells in the ganglion cell (GCL) and inner nuclear layer (INL), and subsequent loss of NF-L-positive ganglion cells and calretinin-positive amacrine cells. Intravitreal injection of KCl along with an N-methyl-d-aspartate (NMDA)-type glutamate receptor antagonist, MK-801, and a non-NMDA-type glutamate receptor antagonist, NBQX, resulted in a reduction in KCl-mediated MMP-9 upregulation in the retina. Furthermore, a synthetic MMP inhibitor inhibited KCl-mediated MMP-9 upregulation, which led to a significant attenuation of KCl-induced retinal damage. conclusions. These results suggest that upregulation of MMP-9, in part, plays a causative role in KCl-induced retinal damage." @default.
• W2000235997 created "2016-06-24" @default.
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• W2000235997 date "2005-06-01" @default.
• W2000235997 modified "2023-10-01" @default.
• W2000235997 title "Intravitreous Injection of a Membrane Depolarization Agent Causes Retinal Degeneration Via Matrix Metalloproteinase-9" @default.
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• W2000235997 doi "https://doi.org/10.1167/iovs.04-1376" @default.
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