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• W2188537475 endingPage "825" @default.
• W2188537475 startingPage "820" @default.
• W2188537475 abstract "Prolonged G(i/o) protein-coupled receptor activation has been shown to lead to receptor internalization and receptor desensitization. In addition, it is well established that although acute activation of these receptors leads to inhibition of adenylyl cyclase (AC), long-term activation results in increased AC activity (especially evident on removal of the inhibitory agonist), a phenomenon defined as AC superactivation or sensitization. Herein, we show that chronic exposure to agonists of G(i)-coupled receptors also leads to a decrease in cholate detergent solubility of G protein subunits, and that antagonist treatment after such chronic agonist exposure leads to a time-dependent reversal of the cholate insolubility. With Chinese hamster ovary and COS cells transfected with several G(i/o)-coupled receptors (i.e., mu- and kappa-opioid, and m(4)-muscarinic), we observed that although no overall change occurred in total content of G(alphai)- and beta(1)-subunits, chronic agonist treatment led to a marked reduction in the ability of 1% cholate to solubilize G(betagamma) as well as G(alphai). This solubility shift is exclusively observed with G(alphai), and was not seen with G(alphas). The disappearance and reappearance of G(alphai) and G(betagamma) subunits from and to the detergent-soluble fractions occur with similar time courses as observed for the onset and disappearance of AC superactivation. Lastly, pertussis toxin, which blocks acute and chronic agonist-induced AC inhibition and superactivation, also blocks the shift in detergent solubility. These results suggest a correlation between the solubility shift of the heterotrimeric G(i) protein and the generation of AC superactivation." @default.
• W2188537475 created "2016-06-24" @default.
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• W2188537475 date "2000-04-01" @default.
• W2188537475 modified "2023-10-16" @default.
• W2188537475 title "Alterations in Detergent Solubility of Heterotrimeric G Proteins after Chronic Activation of G_i/o-Coupled Receptors: Changes in Detergent Solubility Are in Correlation with Onset of Adenylyl Cyclase Superactivation" @default.
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• W2188537475 doi "https://doi.org/10.1124/mol.57.4.820" @default.
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