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- W2015151908 abstract "In previous studies we found that mu-opioids, acting via mu-opioid receptors, inhibit endothelin-stimulated C6 glioma cell growth. In the preceding article we show that the kappa-selective opioid agonist U69,593 acts as a mitogen with a potency similar to that of endothelin in the same astrocytic model system. Here we report that C6 cell treatment with mu-opioid agonists for 1 h results in the inhibition of kappa-opioid mitogenic signaling. The mu-selective agonist endomorphin-1 attenuates kappa-opioid-stimulated DNA synthesis, phosphoinositide turnover, and extracellular signal-regulated kinase phosphorylation. To investigate the role of receptor endocytosis in signaling, we have examined the effects of dynamin-1 and its GTPase-defective, dominant suppressor mutant (K44A) on opioid modulation of extracellular signal-regulated kinase phosphorylation in C6 cells. Overexpression of dynamin K44A in C6 cells does not affect kappa-opioid phosphorylation of extracellular signal-regulated kinase. However, it does block the inhibitory action on kappa-opioid signaling mediated by the kappa-opioid receptor. Our results are consistent with a growing body of evidence of the opposing actions of mu- and kappa-opioids and provide new insight into the role of opioid receptor trafficking in signaling." @default.
- W2015151908 created "2016-06-24" @default.
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- W2015151908 date "2001-12-25" @default.
- W2015151908 modified "2023-10-16" @default.
- W2015151908 title "μ-Opioid Agonist Inhibition of κ-Opioid Receptor-Stimulated Extracellular Signal-Regulated Kinase Phosphorylation Is Dynamin-Dependent in C6 Glioma Cells" @default.
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- W2015151908 doi "https://doi.org/10.1046/j.1471-4159.2000.740574.x" @default.
- W2015151908 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2571950" @default.
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