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• W2158187739 abstract "The two widely coexpressed isoforms of beta-arrestin (termed beta arrestin 1 and 2) are highly similar in amino acid sequence. The beta-arrestins bind phosphorylated heptahelical receptors to desensitize and target them to clathrin-coated pits for endocytosis. To better define differences in the roles of beta-arrestin 1 and 2, we prepared mouse embryonic fibroblasts from knockout mice that lack one of the beta-arrestins (beta arr1-KO and beta arr2-KO) or both (beta arr1/2-KO), as well as their wild-type (WT) littermate controls. These cells were analyzed for their ability to support desensitization and sequestration of the beta(2)-adrenergic receptor (beta(2)-AR) and the angiotensin II type 1A receptor (AT(1A)-R). Both beta arr1-KO and beta arr2-KO cells showed similar impairment in agonist-stimulated beta(2)-AR and AT(1A)-R desensitization, when compared with their WT control cells, and the beta arr1/2-KO cells were even further impaired. Sequestration of the beta(2)-AR in the beta arr2-KO cells was compromised significantly (87% reduction), whereas in the beta arr1-KO cells it was not. Agonist-stimulated internalization of the AT(1A)-R was only slightly reduced in the beta arr1-KO but was unaffected in the beta arr2-KO cells. In the beta arr1/2-KO cells, the sequestration of both receptors was dramatically reduced. Comparison of the ability of the two beta-arrestins to sequester the beta(2)-AR revealed beta-arrestin 2 to be 100-fold more potent than beta-arrestin 1. Down-regulation of the beta(2)-AR was also prevented in the beta arr1/2-KO cells, whereas no change was observed in the single knockout cells. These findings suggest that sequestration of various heptahelical receptors is regulated differently by the two beta-arrestins, whereas both isoforms are capable of supporting receptor desensitization and down-regulation." @default.
• W2158187739 created "2016-06-24" @default.
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• W2158187739 date "2001-02-06" @default.
• W2158187739 modified "2023-09-29" @default.
• W2158187739 title "beta -Arrestin 1 and 2 differentially regulate heptahelical receptor signaling and trafficking" @default.
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• W2158187739 doi "https://doi.org/10.1073/pnas.041608198" @default.
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