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• W1985873390 abstract "Most G protein coupled receptors (GPCR) regulate multiple cellular processes by coupling to more than one kind of G protein. Furthermore, recent studies have reported G protein-independent/β-arrestin-dependent signaling pathway for some GPCRs. Dopamine D2 and D3 receptors (D2R, D3R), the major targets of currently used antipsychotic drugs, are co-expressed in some of the same dopaminergic neurons and regulate the same overlapping effectors. However, the specific subunits of G proteins that regulate each signaling pathway are not clearly identified. In addition, the existence of β-arrestin-dependent/G protein-independent signaling is not clear for these receptors. In this study, we determined the G protein subtypes and β-arrestin dependency involved in the signaling of D2R and D3R, which was measured by inhibition of adenylyl cyclase and extracellular signal-regulated kinase (ERK) activation. For the inhibition of cAMP production in HEK-293 cells, D2R used the Gαo subunit but D3R used the βγ subunit of Gi family proteins. For the regulation of ERK activation, D2R used the α subunits of Gi/o proteins both in HEK-293 cells and COS-7 cells, but D3R used Gαo and Gβγ in HEK-293 cells and COS-7 cells, respectively. β-Arrestin-dependent/G protein-independent ERK activation was not observed for both D2R and D3R. Agonist-induced β-arrestin translocation was observed with D2R but not with D3R, and β-arrestins exerted inhibitory influences on G protein-dependent ERK activation by D2R, but not D3R. These results show that the D2R and D3R, which have overlapping cellular expressions and functional roles, employ distinct G protein subunits depending on the cell types and the effectors they control." @default.
• W1985873390 created "2016-06-24" @default.
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• W1985873390 date "2013-01-01" @default.
• W1985873390 modified "2023-09-30" @default.
• W1985873390 title "Multiple signaling routes involved in the regulation of adenylyl cyclase and extracellular regulated kinase by dopamine D2 and D3 receptors" @default.
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• W1985873390 doi "https://doi.org/10.1016/j.phrs.2012.09.012" @default.
• W1985873390 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23059541" @default.
• W1985873390 hasPublicationYear "2013" @default.
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