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CCR5 has an expanded ligand-binding repertoire and is the primary receptor used by MCP-2 on activated T cells.

Abstract：

:CCR5 is a chemokine receptor expressed by T cells and macrophages, which also functions as the principal coreceptor for macrophage (M)-tropic HIV-1 strains to enter the host cells. In this study, we aim to better understand the ligand-binding profiles of CCR5 and the chemokine-receptor usage on leukocyte cells. We found that MCP-2 could bind to CCR5 transfectants with high affinity and cross-compete effectively with RANTES, MIP-1alpha, and MIP-1beta. MCP-2 is a true agonist for CCR5, eliciting a robust chemotactic response in CCR5 transfectants similar to that of the three known CCR5 ligands and exhibiting cross-desensitization with RANTES in the Ca2+ flux response. MCP-4 also bound to CCR5 with high affinity and was efficiently displaced by other CCR5 ligands. However, MCP-4 only partially displaced the binding of radiolabeled MIP-1alpha and caused a chemotactic response only at high concentrations. Furthermore, MCP-2 inhibited the binding of the M-tropic HIV-1 gp120 envelope glycoprotein to CCR5 and HIV-1 infection of peripheral blood mononuclear cells. More importantly, we found that MCP-2 could bind and elicit chemotaxis in CD3-activated and IL-2-maintained T cells, and most of these functions could be specifically inhibited by the anti-CCR5 mAb 2D7, whereas the responses mediated by MIP-1alpha or MCP-4 were only partially inhibited by 2D7. Thus, although MCP-2 can bind to and signal through CCR1, CCR2b, and CCR5, among which both CCR2 and CCR5 are expressed at high levels on activated T cells, it appears to preferably utilize CCR5 on these cells. In contrast, MIP-1alpha and MCP-4 seem to activate multiple receptors on the same cells.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Ruffing N,Sullivan N,Sharmeen L,Sodroski J,Wu L

doi

10.1006/cimm.1998.1379

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

160-8

issue

2

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(98)91379-X

journal_volume

189

pub_type

杂志文章

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