Related Experiment Video

Updated: Sep 28, 2025

Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
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Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery

Published on: June 28, 2019

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GRK2 selectively attenuates the neutrophil NADPH-oxidase response triggered by β-arrestin recruiting GPR84 agonists

Johanna Fredriksson1, André Holdfeldt1, Jonas Mårtensson1

  • 1Department of Rheumatology and Inflammation Research, University of Gothenburg, Gothenburg, Sweden.

Biochimica Et Biophysica Acta. Molecular Cell Research
|March 28, 2022
PubMed

Insights

G protein-coupled receptor kinase 2 (GRK2) inhibitors prolonged neutrophil reactive oxygen species (ROS) production, revealing its role in fine-tuning inflammatory responses via GPR84 and FPR2 receptors.

Area of Science:

  • Immunology
  • Cell Biology
  • Pharmacology

Background:

  • Neutrophil inflammatory responses require rapid termination of signaling from G protein-coupled receptors (GPCRs).
  • GPCR kinases (GRKs), particularly GRK2 abundant in immune cells, regulate GPCR phosphorylation and signal termination.
  • GPR84 and formyl peptide receptor 2 (FPR2) are key neutrophil receptors involved in inflammation.

Purpose of the Study:

  • Investigate the impact of GRK2 inhibitors on neutrophil functions.
  • Determine the role of GRK2 in GPR84 and FPR2 receptor-mediated signaling.
  • Elucidate the mechanisms underlying GRK2's regulation of neutrophil reactive oxygen species (ROS) production.

Main Methods:

  • Assessed GRK2 expression and localization in human neutrophils.
  • Utilized GRK2 inhibitors to study neutrophil ROS production induced by GPR84 and FPR2 agonists.
  • Analyzed β-arrestin recruitment and actin cytoskeleton involvement in signaling pathways.

Main Results:

  • GRK2 inhibitors enhanced and prolonged ROS production induced by GPR84 agonists, but not FPR2 agonists.
  • Data suggested a receptor-selective function for GRK2, supported by β-arrestin recruitment.
  • β-arrestin independent GPR84-mediated ROS production relied on the actin cytoskeleton for termination.

Conclusions:

  • GRK2 plays a crucial role in regulating neutrophil inflammatory functions.
  • GPR84 signaling involves GRK2, β-arrestin, and actin cytoskeleton to modulate NADPH oxidase activity.
  • GRK2 inhibition impacts neutrophil ROS production in a receptor-dependent manner, offering potential therapeutic insights.
Keywords:
FPR2GPR84GRK2NeutrophilsReactive oxygen speciesβ-Arrestin

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