Abstract
Following activation by its endogenous agonist ligand(s), nearly every G protein-coupled receptor (GPCR) studied to date undergoes regulation by a cascade of events that includes receptor desensitization, receptor endocytosis, receptor recycling, and/or receptor degradation. However, not all GPCR agonists promote receptor desensitization and endocytosis. Indeed, the ability of an agonist to promote endocytosis does not always vary in a linear fashion with agonist activity, and even GPCR antagonists, in some cases, can promote endocytosis, indicating that receptor desensitization and endocytosis are independent functional properties that can display ligand-selective effects, or functional selectivity. Therefore, for any GPCR-ligand pair there are at least two trafficking properties that must be assessed to fully understand signal transduction: (1) whether or not the ligand promotes endocytosis of the receptor and (2) where that receptor goes following its endocytosis. For the vast majority of drugs that target GPCRs neither of these things are known. In this chapter, we outline several cases in which ligands show functional selectivity for receptor trafficking with an emphasis on receptors in which altered ligand-induced trafficking has been shown to be relevant to human disease.
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Whistler, J.L. (2009). Ligand-Selective Receptor Desensitization and Endocytosis. In: Neve, K.A. (eds) Functional Selectivity of G Protein-Coupled Receptor Ligands. The Receptors. Humana Press. https://doi.org/10.1007/978-1-60327-335-0_4
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