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• W2118722562 startingPage "E1286" @default.
• W2118722562 abstract "Elk-1, a member of the ternary complex factor family of Ets domain proteins that bind serum response elements, is activated by phosphorylation in a cell-specific manner in response to growth factors and other agents. The purpose of the current study was to determine whether Elk-1 activation contributes to glucose-/depolarization-induced Ca(2+)-dependent induction of immediate early response genes in pancreatic islet beta-cells. The results of experiments in insulinoma (MIN6) cells demonstrated that Elk-1-binding sites (Ets elements) in the Egr-1 gene promoter contribute to transcriptional activation of the gene. Treatment with either epidermal growth factor (EGF), a known inducer of beta-cell hyperplasia, glucose, or KCl-induced depolarization resulted in Ser(383) phosphorylation and transcriptional activation of Elk-1 (4 +/- 0.3-, P = 0.003, 2.3 +/- 0.19-, P = 0.002, and 2.2 +/- 0.1- fold, P = 0.001 respectively). The depolarization response was inhibited by the Ca(2+) channel blocker verapamil and by the MEK inhibitor PD98059 (53 +/- 6 and 55 +/- 0.5%, respectively). EGF-induced activation of Elk-1 was also inhibited by PD98059 (60 +/- 5%). A dominant negative Ras produced partial inhibition (42%) of the depolarization-induced Elk-1 transcriptional activation. Transfection with a constitutively active Ca(2+)/calmodulin kinase IV plasmid also resulted in Elk-1 transcriptional activation. Experiments with p38, phosphatidylinositol 3-kinase, and protein kinase A inhibitors indicated that these pathways are not involved. We conclude that Elk-1 activation contributes to glucose-/depolarization-induced Ca(2+)-dependent induction of immediate early growth response genes in pancreatic islet beta-cells. Furthermore, the results demonstrated a convergence of nutrient- and growth factor-mediated signaling pathways on Elk-1 activation through induction of Ras/mitogen-activated protein kinase ERK-1 and -2. The role of these pathways in the glucose-induced proliferation of islet beta-cells can now be assessed." @default.
• W2118722562 created "2016-06-24" @default.
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• W2118722562 date "2001-12-01" @default.
• W2118722562 modified "2023-09-26" @default.
• W2118722562 title "Activation of Elk-1, an Ets transcription factor, by glucose and EGF treatment of insulinoma cells" @default.
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• W2118722562 doi "https://doi.org/10.1152/ajpendo.2001.281.6.e1286" @default.
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