Abstract:
:Antagonists of the chemokine receptor, CCR5, may provide important new drugs for the treatment of HIV-1. In this study we have examined the mechanism of action of two functional antagonists of the chemokine receptor CCR5 (UK-396,794, UK-438,235) in signalling and internalisation assays using CHO cells expressing CCR5. Both compounds were potent inverse agonists versus agonist-independent [(35)S]GTPgammaS binding to membranes of CHO cells expressing CCR5. Both compounds also acted as allosteric inhibitors of CCL5 (RANTES) and CCL8 (MCP-2)-stimulated [(35)S]GTPgammaS binding to CHO-CCR5 membranes, reducing the potency and maximal effects of the two chemokines. The data are consistent with effects of the allosteric inhibitors on both the binding and signalling of the chemokines. Both compounds inhibited CCR5 internalisation triggered by chemokines. When CHO-CCR5 cells were treated with either of the two compounds for prolonged periods of time (24 h) an increase (approximately 15%) in cell surface CCR5 was detected.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Haworth B,Lin H,Fidock M,Dorr P,Strange PGdoi
10.1016/j.bcp.2007.06.032subject
Has Abstractpub_date
2007-09-15 00:00:00pages
891-7issue
6eissn
0006-2952issn
1873-2968pii
S0006-2952(07)00409-1journal_volume
74pub_type
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