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CC Chemokine Receptor 5 (CCR5) Desensitization

Authors: Escola, Jean-Michel; Kuenzi, Gabriel; Gaertner, Hubert François; Foti, Michelangelo; Hartley, Oliver;

CC Chemokine Receptor 5 (CCR5) Desensitization

Abstract

CC chemokine receptor 5 (CCR5), the major HIV coreceptor, is a G protein-coupled receptor (GPCR) involved in cell activation and migration in response to chemokines. Blockade of CCR5 is an effective anti-HIV strategy, and potent anti-HIV chemokine analogs such as PSC-RANTES have been developed. These inhibitors act by interfering with receptor trafficking, thereby inducing prolonged intracellular sequestration of CCR5. Like many GPCRs, CCR5 is desensitized following agonist activation. The initial steps in this process are well understood, but later stages, including where CCR5 is sequestered during desensitization, and how anti-HIV chemokine analogs intervene to achieve prolonged sequestration, have yet to be elucidated in detail. In this study we demonstrate that CCR5 cycles to and from the cell surface via the endosome recycling compartment and the trans-Golgi network during desensitization, accumulating in the trans-Golgi network following internalization by both PSC-RANTES and CCL5, the native ligand from which it was derived. In addition, we show that unlike CCR5 sequestered by CCL5, CCR5 sequestered by PSC-RANTES cannot be induced to return to the cell surface by addition of the small molecule CCR5 inhibitor, TAK-779, and that association of PSC-RANTES with CCR5 is more durable than that of native CCL5 during desensitization. Our findings reconcile the previously conflicting descriptions of the location of sequestered CCR5 during desensitization, as well as providing more general insights into potential trafficking routes for endocytosed GPCRs and further elucidation of the unusual inhibitory mechanism of chemokine analogs with potent anti-HIV activity.

Country
Switzerland
Related Organizations
Keywords

Endosomes/*metabolism, Receptors, CCR5, Anti-HIV Agents, *Gene Expression Regulation, T-Lymphocytes, Receptors, CCR5/*metabolism, 612, CHO Cells, Endosomes, Ligands, 576, Receptors, G-Protein-Coupled, Cricetulus, Cricetinae, Anti-HIV Agents/pharmacology, Cell Membrane/*metabolism/virology, Animals, Humans, Trans-Golgi Network/*metabolism, Amides/pharmacology, Leukocytes, Mononuclear/cytology, Microscopy, Confocal/methods, Microscopy, Confocal, Quaternary Ammonium Compounds/pharmacology, Cell Membrane, Receptors, CCR5/metabolism, Trans-Golgi Network/metabolism, Endosomes/metabolism, Receptors, G-Protein-Coupled/metabolism, T-Lymphocytes/metabolism/virology, Amides, Quaternary Ammonium Compounds, Kinetics, Gene Expression Regulation, Leukocytes, Mononuclear, Cell Membrane/metabolism/virology, trans-Golgi Network, ddc: ddc:576, ddc: ddc:612

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
58
Top 10%
Top 10%
Top 10%
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gold