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• W2023365839 abstract "Increasing evidence suggests that chronic, sub-clinical inflammation plays an important role in the pathogenesis of diabetic retinopathy. We have established the potential role of the inflammatory enzyme, core 2 β-1, 6-N-acetylglucosaminyltransferase (C2GNT) in diabetic retinopathy. The present study was designed to explore the NADPH oxidase signaling pathway in the tumor necrosis factor-alpha (TNF-α)-induced activity of C2GNT in leukocytes. Human leukocytes (U937 cells) and an Epstein–Barr-transformed lymphoblastoid cell line deficient in p47phox (F10007 cells) were used for the study. Cells were exposed to TNF-α for 24 h in the presence and absence of 1) NADPH oxidase inhibitors (apocynin and scrambled and unscrambled gp91ds-tat), 2) LY379196 (specific protein kinase C β1/2 (PKCβ1/2) inhibitor), and 3) the antioxidant tiron. Subsequent C2GNT and NADPH activity was measured and the adhesion of U937 and F10007 cells to endothelial cells was assessed. TNF-α-induced C2GNT activity (1813 ± 326 pmol/h/mg protein) (mean ± SEM) in human leukocytes was significantly reversed with apocynin (153 ± 82 pmol/h/mg protein), unscrambled gp91ds-tat (244 ± 122 pmol/h/mg protein) and tiron (756 ± 87 pmol/h/mg protein). We further supported this C2GNT–NADPH oxidase link using p47phox-deficient leukocytes. The deficiency in p47phox prevented TNF-α-induced NADPH oxidase and C2GNT activity and adherence to endothelial cells. The response to TNF-α was restored by transfection with an expression plasmid containing a p47phox cDNA inserted in the sense direction. Our results demonstrate for the first time a novel signaling crosstalk between TNF-α, NADPH oxidase, PKCβ1/2 and C2GNT in leukocytes." @default.
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• W2023365839 date "2012-04-01" @default.
• W2023365839 modified "2023-10-17" @default.
• W2023365839 title "Cellular crosstalk between TNF-α, NADPH oxidase, PKCβ2, and C2GNT in human leukocytes" @default.
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• W2023365839 doi "https://doi.org/10.1016/j.cellsig.2011.12.003" @default.
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