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Related Experiment Videos

Kinin receptors: functional aspects.

François Marceau1, Thierry Sabourin, Steeve Houle

  • 1Centre Hospitalier Universitaire de Québec, Centre de recherche du Pavillon l'Hôtel-Dieu de Québec, 11 Côte du Palais, Quebec, Canada GIR 2J6. francois.marceau@crhdq.ulaval.ca

International Immunopharmacology
|December 20, 2002
PubMed
Summary

This study reveals distinct regulatory mechanisms for kinin receptors (B1R and B2R). While B2Rs internalize and recycle, B1Rs redistribute to caveolae, offering insights into kinin receptor regulation.

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Area of Science:

  • Pharmacology
  • Cell Biology
  • Molecular Biology

Background:

  • Two kinin receptors, B1R and B2R, exist in mammals.
  • Understanding their regulation is crucial for studying kinin-mediated responses.

Purpose of the Study:

  • To investigate the distinct regulation mechanisms of B1R and B2R at the cellular level.
  • To explore receptor trafficking and down-regulation pathways.

Main Methods:

  • Utilized recombinant fusion proteins of rabbit B1R/B2R with GFP-related proteins.
  • Analyzed receptor internalization, recycling, proteolysis, phosphorylation, and translocation.
  • Investigated B1R induction in rabbit aortic smooth muscle cells.

Main Results:

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  • Constitutive B2Rs internalize upon stimulation but fully recycle; proteolysis leads to down-regulation.
  • Inducible B1Rs, upon des-Arg9-kinin stimulation, do not phosphorylate or internalize but redistribute to caveolae.
  • B2Rs also transiently translocate to caveolae before endocytosis.
  • Cytokine-induced B1R expression in rabbit vascular tissue depends on NF-κB, but kinins do not induce B1R expression.

    • Conclusions:

    • B1R and B2R exhibit differential regulation pathways, including distinct trafficking and down-regulation mechanisms.
    • Proteolysis of B2Rs and caveolae redistribution of B1Rs are significant regulatory events.
    • NF-κB mediates B1R induction by cytokines in vascular tissue, independent of kinin receptor stimulation.