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• W1978404758 abstract "G protein-coupled receptors (GPCRs) are allosteric proteins that adopt inactive (R) and active (R*) conformations in equilibrium. R* is promoted by agonists or occurs spontaneously, leading to constitutive activity of the receptor. Conversely, inverse agonists promote R and decrease constitutive activity. The existence of another pharmacological entity, referred to as protean agonists (after Proteus, the Greek god who could change shape), was assumed on theoretical grounds. It was predicted from the existence of constitutive activity that a same ligand of this class could act either as an agonist or an inverse agonist at the same GPCR. Here, we show that proxyfan, a high-affinity histamine H3-receptor ligand, acts as a protean agonist at recombinant H3 receptors expressed in the same Chinese hamster ovary cells. In support of the physiological relevance of the process, we show that proxyfan also behaves as a protean agonist at native H3 receptors known to display constitutive activity. On neurochemical and behavioral responses in rodents and cats, proxyfan displays a spectrum of activity ranging from full agonism to full inverse agonism. Thus, protean agonism demonstrates the existence of ligand-directed active states LR* different from, and competing with, constitutively active states R* of GPCRs, and defines a pharmacological entity with important therapeutic implications." @default.
• W1978404758 created "2016-06-24" @default.
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• W1978404758 date "2003-09-05" @default.
• W1978404758 modified "2023-10-13" @default.
• W1978404758 title "Protean agonism at histamine H ₃ receptors <i>in vitro</i> and <i>in vivo</i>" @default.
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• W1978404758 doi "https://doi.org/10.1073/pnas.1932276100" @default.
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