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- W1757192287 abstract "To determine the signal mediators involved in glycated human serum albumin (GHSA) stimulation of interleukin (IL)-8 and monocyte chemotactic protein (MCP)-1 secretion in human retinal pigment epithelium (hRPE) cells.hRPE cells were stimulated by GHSA in the presence or absence of a series of kinase inhibitors. The induced IL-8 and MCP-1 mRNA and proteins were determined by reverse transcription-polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA). Western blot analysis, electrophoretic mobility shift assay, and immunohistochemical staining were used to analyze activation of signaling mediators and transcription factors.Incubation of hRPE cells with GHSA resulted in rapid activation of Raf-1, extracellular signal-regulated protein kinases (ERK) 1/2, p38, and the transcription factor nuclear factor (NF)-kappaB. Coincubation of hRPE cells with the mitogen-activated protein (MAP) kinase (MEK) inhibitor U0126; NF-kappaB inhibitors BAY11-7085, caffeic acid phenethyl ester (CAPE), parthenolide, and curcumin; protein kinase (PK)C inhibitor Ro318220; and protein tyrosine kinase (PTK) inhibitor genistein largely eliminated most of the stimulated production of IL-8 and MCP-1. Combined inhibition of MEK by U0126, p38 by SB202190, and Janus kinase (jak) by AG490 revealed that GHSA stimulation of IL-8 production was predominately mediated by MEK and to a lesser extent by p38 pathways, whereas activation of MEK, p38, and jak was required for maximal MCP-1 induction. Moreover, GHSA-stimulated IL-8 secretion was more sensitive to U0126 (50% inhibitory concentration [IC(50)] = 0.5 microM) than MCP-1 (IC(50) = 10 microM).GHSA stimulates hRPE IL-8 and MCP-1 production through divergent and overlapping, but not identical, intracellular signaling cascades. GHSA induces activation of a series of kinases including PKC, PTK, MAPK, p38, and jak and the transcription factor NF-kappaB. The Raf/MAPK pathway plays an essential role in GHSA signaling." @default.
- W1757192287 created "2016-06-24" @default.
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- W1757192287 date "2001-06-01" @default.
- W1757192287 modified "2023-09-23" @default.
- W1757192287 title "Signaling pathways for glycated human serum albumin-induced IL-8 and MCP-1 secretion in human RPE cells." @default.
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- W1757192287 hasPublicationYear "2001" @default.
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