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• W2102355451 abstract "Astroglia are a principal target of long-term mu antiproliferative actions. The mitogen-activated protein (MAP) kinase known as extracellular signal-regulated kinase (ERK), is a key mediator of cell proliferation. In studies on the mechanism of short- and long-term mu opioid regulation of the ERK signaling pathway, we show that the mu opioid agonist [d-Ala2,N-Me-Phe4,Gly5-ol]-enkephalin (DAMGO), acting via the endogenous mu opioid receptor (MOR), induced sequential epidermal growth factor receptor (EGF) receptor (EGFR) Tyr phosphorylation, Ser phosphorylation, and down-regulation in immortalized rat cortical astrocytes. The short-term action of DAMGO resulted in the stimulation of ERK phosphorylation. 4(3-Chlorophenylamino)-6,7-dimethoxyquinazoline (Tyrphostin AG1478), a selective inhibitor of EGFR Tyr kinase activity, blocked EGFR and ERK activation by short-term DAMGO administration, implicating EGFR transactivation in its stimulation of ERK activity. Inhibitors of matrix metalloproteinases attenuated MOR-mediated ERK phosphorylation, suggesting that shedding of EGF-like ligands from the plasma membrane may be involved in the EGFR transactivation process. Prolonged DAMGO exposure induced EGFR internalization/down-regulation, did not activate ERK, and inhibited exogenous EGF-stimulated ERK phosphorylation. MOR-mediated EGFR down-regulation seems to be MAP kinase-dependent, because it was inhibited by the ERK kinase inhibitor 1,4-diamino-2,3-dicyano-1,4-bis(2-aminophenylthio) butadiene (U0126), and tyrphostin AG1478. The kappa opioid agonist (5alpha,7alpha,8beta)-(-)-N-methyl-N-(7-(1-pyrrolidinyl)-1-oxaspiro(4,5)dec-8-yl) benzeneacetamide (U69,593) induced Tyr and Ser phosphorylation of EGFR and activation of ERK. However, long-term application of U69,593 neither down-regulated EGFR nor inhibited EGF-induced ERK activation. Instead, it engendered a sustained activation of ERK. Collectively, our data suggest that long-term application of DAMGO initiates heterologous down-regulation of EGFR via a mechanism involving ERK in astrocytes." @default.
• W2102355451 created "2016-06-24" @default.
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• W2102355451 date "2003-11-26" @default.
• W2102355451 modified "2023-10-14" @default.
• W2102355451 title "μ Opioid Transactivation and Down-Regulation of the Epidermal Growth Factor Receptor in Astrocytes: Implications for Mitogen-Activated Protein Kinase Signaling" @default.
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• W2102355451 doi "https://doi.org/10.1124/mol.64.6.1391" @default.
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