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• W2555147549 abstract "The human histamine H₃ receptor (hH₃R) is subject to extensive gene splicing that gives rise to a large number of functional and nonfunctional isoforms. Despite the general acceptance that G protein–coupled receptors can adopt different ligand-induced conformations that give rise to biased signaling, this has not been studied for the H₃R; further, it is unknown whether splice variants of the same receptor engender the same or differential biased signaling. Herein, we profiled the pharmacology of histamine receptor agonists at the two most abundant hH₃R splice variants (hH₃R₄₄₅ and hH₃R₃₆₅) across seven signaling endpoints. Both isoforms engender biased signaling, notably for 4-[3-(benzyloxy)propyl]-1<i>H</i>-imidazole (proxyfan) [e.g., strong bias toward phosphorylation of glycogen synthase kinase 3<i>β</i> (GSK3<i>β</i>) via the full-length receptor] and its congener 3-(1H-imidazol-4-yl)propyl-(4-iodophenyl)-methyl ether (iodoproxyfan), which are strongly consistent with the former’s designation as a “protean” agonist. The 80 amino acid IL3 deleted isoform hH₃R₃₆₅ is more permissive in its signaling than hH₃R₄₄₅: 2-(1<i>H</i>-imidazol-5-yl)ethyl imidothiocarbamate (imetit), proxyfan, and iodoproxyfan were all markedly biased away from calcium signaling, and principal component analysis of the full data set revealed divergent profiles for all five agonists. However, most interesting was the identification of differential biased signaling between the two isoforms. Strikingly, hH₃R₃₆₅ was completely unable to stimulate GSK3<i>β</i> phosphorylation, an endpoint robustly activated by the full-length receptor. To the best of our knowledge, this is the first quantitative example of differential biased signaling via isoforms of the same G protein–coupled receptor that are simultaneously expressed in vivo and gives rise to the possibility of selective pharmacological targeting of individual receptor splice variants." @default.
• W2555147549 created "2016-11-30" @default.
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• W2555147549 date "2016-11-18" @default.
• W2555147549 modified "2023-10-18" @default.
• W2555147549 title "Isoform-Specific Biased Agonism of Histamine H₃Receptor Agonists" @default.
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• W2555147549 doi "https://doi.org/10.1124/mol.116.106153" @default.
• W2555147549 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27864425" @default.
• W2555147549 hasPublicationYear "2016" @default.
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