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- W2011260197 abstract "The study of G protein-coupled receptor signal transduction and behavior in living cells is technically difficult because of a lack of useful biological reagents. We show here that a fully functional alphalb-adrenoceptor tagged with the green fluorescent protein (alphalbAR/GFP) can be used to determine the molecular mechanism of intemalization of alphalbAR/ GFP in living cells. In mouse alphaT3 cells, alpha1bAR/GFP demonstrates strong, diffuse fluorescence along the plasma membrane when observed by confocal laser scanning microscope. The fluorescent receptor binds agonist and antagonist and stimulates phosphatidylinositol/Ca2+ signaling in a similar fashion to the wild receptor. In addition, alpha1bAR/ GFP can be internalized within minutes when exposed to agonist, and the subcellular redistribution of this receptor can be determined by measurement of endogenous fluorescence. The phospholipase C inhibitor U73,122, the protein kinase C activator PMA, and inhibitor staurosporine, and the Ca2+-ATPase inhibitor thapsigargin were used to examine the mechanism of agonist-promoted alphalbAR/GFP redistribution. Agonist-promoted internalization of alphalbAR/GFP was closely linked to phospholipase C activation and was dependent on protein kinase C activation, but was independent of the increase in intracellular free Ca2+ concentration. This study demonstrated that real-time optical monitoring of the subcellular localization of alphalbAR (as well as other G protein-coupled receptors) in living cells is feasible, and that this may provide a valuable system for further study of the biochemical mechanism(s) of agonist-induced receptor endocytosis." @default.
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- W2011260197 date "1998-08-01" @default.
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- W2011260197 title "Real-Time Optical Monitoring of Ligand-Mediated Internalization of α1b-Adrenoceptor with Green Fluorescent Protein" @default.
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- W2011260197 doi "https://doi.org/10.1210/mend.12.8.0149" @default.
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