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Related Experiment Videos

beta-arrestins regulate interleukin-8-induced CXCR1 internalization.

J Barlic1, M H Khandaker, E Mahon

  • 1Laboratory of Molecular Immunology and Inflammation, John P. Robarts Research Institute, London, Ontario N6G 2V4, Canada.

The Journal of Biological Chemistry
|May 29, 1999
PubMed
Summary
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Neutrophil interleukin-8 receptors (CXCR1) internalize upon ligand binding. This study reveals CXCR1 internalization requires G protein-coupled receptor kinase 2, beta-arrestins, and dynamin, occurring via clathrin-coated vesicles.

Area of Science:

  • Cell biology
  • Immunology
  • Molecular pharmacology

Background:

  • Neutrophils play a key role in acute inflammation, with their function regulated by interleukin-8 receptors (CXCR1 and CXCR2).
  • These receptors undergo rapid desensitization and internalization upon binding chemokine ligands.
  • Efficient CXCR1 re-expression suggests involvement of regulatory pathways similar to beta2-adrenergic receptors.

Purpose of the Study:

  • To investigate the internalization pathway of ligand-activated CXCR1.
  • To identify the specific cellular machinery involved in CXCR1 receptor trafficking.

Main Methods:

  • Transient expression of a CXCR1-GFP construct in HEK 293 and RBL-2H3 cell lines.
  • Stimulation with interleukin-8 and assessment of receptor internalization.

Related Experiment Videos

  • Co-expression of dominant-negative mutants for G protein-coupled receptor kinase 2, beta-arrestin 1, and dynamin I.
  • Confocal microscopy to observe co-localization of CXCR1-GFP and transferrin.

    • Main Results:

    • Interleukin-8 induced CXCR1 sequestration in RBL-2H3 cells.
    • CXCR1 internalization in HEK 293 cells required co-expression of G protein-coupled receptor kinase 2 and beta-arrestins.
    • Dominant-negative beta-arrestin 1 and dynamin I mutants blocked CXCR1 internalization in RBL-2H3 cells.
    • CXCR1 and transferrin co-localized in endosomes, indicating clathrin-coated vesicle internalization.

    Conclusions:

    • Agonist-induced CXCR1 internalization is dependent on G protein-coupled receptor kinase 2, beta-arrestins, and dynamin.
    • CXCR1 internalization occurs via the clathrin-coated vesicle pathway.
    • These findings elucidate the molecular mechanisms regulating CXCR1 receptor turnover during inflammatory responses.