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Molecular Pharmacology

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Research ArticleArticle

Kinins Promote B2 Receptor Endocytosis and Delay Constitutive B1 Receptor Endocytosis

Johan Enquist, Carl Skröder, Jennifer L. Whistler and L.M. Fredrik Leeb-Lundberg
Molecular Pharmacology February 2007, 71 (2) 494-507; DOI: https://doi.org/10.1124/mol.106.030858
Johan Enquist
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Carl Skröder
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Jennifer L. Whistler
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L.M. Fredrik Leeb-Lundberg
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Abstract

Upon sustained insult, kinins are released and many kinin responses, such as inflammatory pain, adapt from a B2 receptor (B2R) type in the acute phase to a B1 receptor (B1R) type in the chronic phase. In this study, we show that kinins modulate receptor endocytosis to rapidly decrease B2R and increase B1R on the cell surface. B2Rs, which require agonist for activity, are stable plasma membrane components without agonist but recruit β-arrestin 2, internalize in a clathrin-dependent manner, and recycle rapidly upon agonist treatment. In contrast, B1Rs, which are inducible and constitutively active, constitutively internalize without agonist via a clathrin-dependent pathway, do not recruit β-arrestin 2, bind G protein-coupled receptor sorting protein, and target lysosomes for degradation. Agonist delays B1R endocytosis, thus transiently stabilizing the receptor. Most of the receptor trafficking phenotypes are transplantable from one receptor to the other through exchange of the C-terminal receptor tails, indicating that the tails contain epitopes that are important for the binding of protein partners that participate in the endocytic and postendocytic receptor choices. It is noteworthy that the agonist delay of B1R endocytosis is not transplanted to the B2R via the B1R tail, suggesting that this property of the B1R requires another domain. These events provide a rapid kinin-dependent mechanism for 1) regulating the constitutive B1R activity and 2) shifting the balance of accessible receptors in favor of B1R.

Footnotes

  • This work was supported in part by funds from the Swedish Research Council grant 15057, AlfredÖsterlunds Stiftelse, Torsten och Ragnar Söderbergs Stiftelser, the Faculty of Medicine at Lund University in part through the Vascular Wall and Blood and Defense prioritized programs, National Institutes of Health grant GM41659 (to L.M.F.L.-L.), and funds provided from the State of California for medical research on alcohol and substance abuse through the University of California San Francisco (to J.L.W.).

  • ABBREVIATIONS: GPCR, G protein-coupled receptors; B1R, B1 receptor; B2R, B2 receptor; GASP, GPCR-associated sorting protein; HEK, human embryonic kidney; FBS, fetal bovine serum; DMEM, Dulbecco's modified Eagle's medium; GFP, green fluorescent protein; PBS, phosphate-buffered saline; FACS, fluorescence-activated cell sorting; APC, allophycocyanin; TBS, Tris-buffered saline; DAKD, desArg10kallidin; BK, bradykinin; GST, glutathione transferase; BPA, biotinylation protection assay; PNGase, peptide N-glycosidase F.

    • Received September 13, 2006.
    • Accepted November 16, 2006.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 71 (2)
Molecular Pharmacology
Vol. 71, Issue 2
1 Feb 2007
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Research ArticleArticle

Kinins Promote B2 Receptor Endocytosis and Delay Constitutive B1 Receptor Endocytosis

Johan Enquist, Carl Skröder, Jennifer L. Whistler and L.M. Fredrik Leeb-Lundberg
Molecular Pharmacology February 1, 2007, 71 (2) 494-507; DOI: https://doi.org/10.1124/mol.106.030858

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Research ArticleArticle

Kinins Promote B2 Receptor Endocytosis and Delay Constitutive B1 Receptor Endocytosis

Johan Enquist, Carl Skröder, Jennifer L. Whistler and L.M. Fredrik Leeb-Lundberg
Molecular Pharmacology February 1, 2007, 71 (2) 494-507; DOI: https://doi.org/10.1124/mol.106.030858
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