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• W2018687616 abstract "Prolonged P2Y-receptor signalling can cause vasoconstriction leading to hypertension, vascular smooth muscle hypertrophy, and hyperplasia. G protein-coupled receptor signalling is negatively regulated by G protein-coupled receptor kinases (GRKs) and arrestin proteins, preventing prolonged or inappropriate signalling. This study investigates whether GRKs and arrestins regulate uridine 5′-triphosphate (UTP)-stimulated contractile signalling in adult Wistar rat mesenteric arterial smooth muscle cells (MSMCs). Mesenteric arteries contracted in response to UTP challenge: When an EC50 UTP concentration (30 µM, 5 min) was added 5 min before (R1) and after (R2) the addition of a maximal UTP concentration (Rmax: 100 µM, 5 min), R2 responses were decreased relative to R1, indicating desensitization. UTP-induced P2Y-receptor desensitization of phospholipase C signalling was studied in isolated MSMCs transfected with an inositol 1,4,5-trisphosphate biosensor and/or loaded with Ca2+-sensitive dyes. A similar protocol (R1/R2 = 10 µM; Rmax = 100 µM, applied for 30 s) revealed markedly reduced R2 when compared with R1 responses. MSMCs were transfected with dominant-negative GRKs or siRNAs targeting specific GRK/arrestins to probe their respective roles in P2Y-receptor desensitization. GRK2 inhibition, but not GRK3, GRK5, or GRK6, attenuated P2Y-receptor desensitization. siRNA-mediated knockdown of arrestin2 attenuated UTP-stimulated P2Y-receptor desensitization, whereas arrestin3 depletion did not. Specific siRNA knockdown of the P2Y2-receptor almost completely abolished UTP-stimulated IP3/Ca2+ signalling, strongly suggesting that our study is specifically characterizing this purinoceptor subtype. These new data highlight roles of GRK2 and arrestin2 as important regulators of UTP-stimulated P2Y2-receptor responsiveness in resistance arteries, emphasizing their potential importance in regulating vasoconstrictor signalling pathways implicated in vascular disease." @default.
• W2018687616 created "2016-06-24" @default.
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• W2018687616 date "2010-08-12" @default.
• W2018687616 modified "2023-10-14" @default.
• W2018687616 title "G protein-coupled receptor kinase 2 and arrestin2 regulate arterial smooth muscle P2Y-purinoceptor signalling" @default.
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• W2018687616 doi "https://doi.org/10.1093/cvr/cvq249" @default.
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