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Agonism and Biased Signaling.

Terry Kenakin1

  • 1Department of Pharmacology, School of Medicine, Chapel Hill, NC, USA. kenakin@email.unc.edu.

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Biased signaling in G protein-coupled receptors (GPCRs) is a natural function. Ligands can alter receptor signaling pathways, offering new dimensions for agonist selectivity and drug development.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Biochemistry

Background:

  • G protein-coupled receptors (GPCRs) mediate cellular responses to diverse stimuli.
  • Ligand binding to GPCRs traditionally focuses on affinity and efficacy.
  • Understanding GPCR signaling complexity is crucial for drug discovery.

Purpose of the Study:

  • To explore biased signaling as an inherent function of GPCRs.
  • To investigate how ligands influence GPCR conformational states and downstream signaling.
  • To discuss methods for measuring and analyzing selective signaling.

Main Methods:

  • Analysis of probe dependence in GPCR function.
  • Characterization of ligand-induced conformational changes.
  • Assessment of intrinsic efficacy and receptor state stabilization.
  • In vitro and in vivo system comparisons.

Main Results:

  • Ligands (agonists, antagonists, allosteric modulators) can induce biased signaling by stabilizing distinct receptor conformations.
  • Agonist selectivity extends beyond receptor binding to pathway-specific signaling.
  • Varying intrinsic efficacy and selective stabilization of receptor states are key mechanisms.

Conclusions:

  • Biased signaling is a natural, functional property of GPCRs.
  • This phenomenon provides a framework for understanding and exploiting agonist selectivity.
  • Translating these findings from in vitro to in vivo systems is essential for therapeutic applications.