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A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
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Biased GPCR Signaling: Possible Mechanisms and Therapeutic Applications

Luyu Fan1, Sheng Wang1,2

  • 1Key Laboratory of Systems Health Science of Zhejiang Province, School of Life Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China.

Biochemistry
|February 27, 2025
PubMed

Insights

Biased signaling in G protein-coupled receptors (GPCRs) offers targeted therapies. Understanding in vitro to in vivo translation is key for developing effective biased therapeutics with fewer side effects.

Area of Science:

  • Pharmacology
  • Molecular Biology
  • Drug Discovery

Background:

  • G protein-coupled receptors (GPCRs) are major drug targets.
  • Biased signaling involves selective activation of downstream pathways (e.g., G protein vs. β-arrestin).
  • Factors influencing bias include receptor, ligand, system, and spatial contexts, shaped by receptor conformation and kinetics.

Purpose of the Study:

  • To review the current understanding of GPCR-biased signaling.
  • To examine the role of structural and kinetic factors in bias.
  • To address challenges in translating in vitro findings to in vivo applications for drug development.

Main Methods:

  • Literature review of GPCR-biased signaling.
  • Analysis of molecular and kinetic influences on signaling bias.
  • Discussion of challenges and future directions in therapeutic applications.

Main Results:

  • Biased signaling holds potential for enhanced therapeutic efficacy and reduced side effects.
  • A significant challenge is correlating in vitro ligand efficacy with in vivo responses.
  • Structural and kinetic contexts critically influence signaling bias.

Conclusions:

  • Bridging the gap between in vitro and in vivo studies is crucial for advancing biased therapeutics.
  • Further research into kinetic context and system bias is needed.
  • Developing viable biased therapeutics requires a deeper understanding of GPCR signaling dynamics.
Keywords:
G protein-coupled receptorbiased signalingbiased therapeutic drug designkinetic effects

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