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• W2040887924 endingPage "1728" @default.
• W2040887924 startingPage "1721" @default.
• W2040887924 abstract "Diabetic nephropathy is a major complication of diabetes leading to end-stage renal disease, which requires hemodialysis. Although the mechanism by which it progresses is largely unknown, the role of hyperglycemia-derived oxidative stress has recently been the focus of attention as the cause of diabetic complications. Constituent cells of the renal glomeruli have the capacity to release reactive oxygen species (ROS) upon stimulation of NADPH oxidase activated by protein kinase C (PKC). Hyperglycemia and insulin resistance in the diabetic state are often associated with activation of PKC and tumor necrosis factor (TNF)-alpha, respectively. The aim of this study is to clarify the signaling pathway leading to ROS production by PKC and TNF-alpha in rat glomeruli. Isolated rat glomeruli were stimulated with phorbol 12-myristate 13-acetate (PMA) and TNF-alpha, and the amount of ROS was measured using a chemiluminescence method. Stimulation with PMA (10 ng/ml) generated ROS with a peak value of 136+/-1.2 cpm/mg protein (mean+/-SEM). The PKC inhibitor H-7, the NADPH oxidase inhibitor diphenylene iodonium and the phosphatidylinositol-3 (PI-3) kinase inhibitor wortmannin inhibited PMA-induced ROS production by 100%, 100% and 80%, respectively. In addition, TNF-alpha stimulated ROS production (283+/-5.8/mg protein/20 min). The phosphodiesterase inhibitor cilostazol activates protein kinase A and is reported to improve albuminuria in diabetic rats. Cilostazol (100 microg/ml) inhibited PMA, and TNF-alpha-induced ROS production by 78+/-1.8, and 19+/-2.7%, respectively. The effects of cilostazol were not additive with wortmannin. Cilostazol arrests oxidative stress induced by PKC activation by inhibiting the PI-3 kinase-dependent pathway, and may thus prevent the development of diabetic nephropathy." @default.
• W2040887924 created "2016-06-24" @default.
• W2040887924 creator A5046506553 @default.
• W2040887924 creator A5069065380 @default.
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• W2040887924 date "2007-04-01" @default.
• W2040887924 modified "2023-09-24" @default.
• W2040887924 title "Induction of reactive oxygen species from isolated rat glomeruli by protein kinase C activation and TNF-α stimulation, and effects of a phosphodiesterase inhibitor" @default.
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• W2040887924 doi "https://doi.org/10.1016/j.lfs.2007.02.001" @default.
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