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http://dx.doi.org/10.3345/kjp.2008.51.1.54

Effects of puromycin aminonucleoside on the cytoskeletal changes of glomerular epithelial cells  

Lee, Jun Ho (Department of Pediatrics, Pochon CHA University, College of Medicine)
Ha, Tae Sun (Department of Pediatrics, Chungbuk National University, College of Medicine)
Publication Information
Clinical and Experimental Pediatrics / v.51, no.1, 2008 , pp. 54-61 More about this Journal
Abstract
Purpose : This study was designed to clarify the mechanism of proteinuria in nephrotic syndrome patients by using puromycin aminonucleoside (PAN) nephrosis model. Methods : Following administration of various concentrations of PAN and antioxidants we observed the changes of podocyte cytoskeletons in cultured rat glomerular epithelial cells (GEpC) by method of scanning electron microscope, reactive oxyten species (ROS) analysis, permeability assay, confocal microscope, and Western blot assay. Results : PAN not only induced the ultrastructural changes of GEpC, such as shortening and fusion of microvilli, but also separated the intercellular gaps and linear ZO-1. PAN induced oxidative stresses in time and dose dependent manners and increases of intercellular permeability in anti-oxidants inhibitable manners. High concentration of PAN induced not only actin polymerization and disorganization, but also the conglomerulation and internal dislocation of ${\alpha}-actinin$ protein. The intensities of fluorescences of ZO-1 protein were diminished and internalized by PAN in a dose-dependent manner, which were inhibited by anti anti-oxidants. Conclusion : PAN induced the changes of podocytes cytoskeleton and junctional barriers by way of increasing ROS in GEpC that resulted in increasing their permeability in a antioxidatn-inhibitable manner. Glomerular hyperpermeability induced by PAN mediateing through oxidative stresses is thought to take part in the mechanism of proteinuria in nephrotic syndrome.
Keywords
Puromycin aminoglycoside; Nephrotic syndrome; Proteinuria; Oxidative stresses; Antioxidants;
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Times Cited By KSCI : 1  (Citation Analysis)
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