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• W1963608974 abstract "purpose. Rod outer segment (ROS) uptake, a crucial function of the retinal pigment epithelium (RPE), probably involve multiple proteins, yet only a small number have so far been identified. The goal of this study was to find additional genes involved in ROS uptake and degradation by identifying ROS-induced gene expression changes. methods. Human RPE-derived ARPE-19 cells were harvested 3 and 12 hours after addition of bovine ROS. Gene expression profiles were compared with control cultures by using a custom human retina cDNA microarray and were validated by quantitative real-time RT-PCR (QPCR). ROS binding and internalization were quantitated with a fluorescence assay. results. Alterations in the expression levels of multiple genes (especially ones involved in transcriptional regulation, signal transduction, or protein modification) were detected 3 hours after ROS challenge, whereas by 12 hours most had returned to baseline. QPCR results corroborated the microarray results for seven of the eight genes tested. Time-course QPCR experiments on an independent sample set demonstrated characteristic temporal expression changes for each gene. Protein levels of one of these, plasminogen activator inhibitor-1 (PAI-1), were tested and found to parallel the mRNA changes. In addition, exogenous PAI-1 inhibited ROS uptake by RPE cells in vitro, consistent with its putative function in integrin receptor regulation. conclusions. ROS uptake is associated with regulation of multiple RPE genes in a gene-specific temporal pattern. These genes are candidates for involvement in ROS uptake and degradation, particularly PAI-1, for which the study provided evidence suggesting that it may participate in the negative feedback of ROS uptake." @default.
• W1963608974 created "2016-06-24" @default.
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• W1963608974 date "2004-07-01" @default.
• W1963608974 modified "2023-10-18" @default.
• W1963608974 title "Changes in Retinal Pigment Epithelial Gene Expression Induced by Rod Outer Segment Uptake" @default.
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• W1963608974 doi "https://doi.org/10.1167/iovs.03-0863" @default.
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