Enhanced anti-HIV-1 activity and altered chemotactic potency of NH2-terminally processed macrophage-derived chemokine (MDC) imply an additional MDC receptor - PubMed

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• PMID: 9743322

Enhanced anti-HIV-1 activity and altered chemotactic potency of NH2-terminally processed macrophage-derived chemokine (MDC) imply an additional MDC receptor

S Struyf et al. J Immunol. 1998.

Abstract

Posttranslational processing of chemokines increases (IL-8) or decreases (monocyte chemotactic protein-1) their chemotactic potency. Macrophage-derived chemokine (MDC) attracts monocytes, dendritic cells, activated lymphocytes, and NK cells and has reportedly anti-HIV-1 activity. Here we report that truncation of MDC by deletion of two NH2-terminal residues resulted in impaired binding to CC chemokine receptor (CCR)4, the only identified MDC receptor so far. Truncated MDC(3-69) failed to desensitize calcium mobilization by MDC(1-69) or thymus- and activation-regulated chemokine (TARC), another CCR4 ligand. MDC(3-69) lacked HUT-78 T cell chemotactic activity but retained its capacity to attract monocytes and to desensitize chemotaxis. Compared with MDC(1-69), MDC(3-69) had weak but enhanced antiviral activity against M- and T-tropic HIV-1 strains. Furthermore, both MDC forms failed to signal through the orphan receptors Bonzo/STRL33 and BOB/GPR15 and to desensitize RANTES and stromal cell-derived factor (SDF)-1 responses in CCR5-transfected and CXC chemokine receptor (CXCR)4-transfected cells, respectively. These findings suggest that MDC recognizes another, yet unidentified, receptor. We conclude that minimal NH2-terminal truncation of MDC differentially affects its various immunologic functions.

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