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- W2003037948 abstract "The selective CXC chemokine receptor 3 (CXCR3) agonists, monokine induced by interferon-γ (IFN- γ)/CXC chemokine ligand 9 (CXCL9), IFN-inducible protein 10/CXCL10, and IFN-inducible T cell α chemoattractant (I-TAC)/CXCL11, attract CXCR3+ cells such as CD45RO+ T lymphocytes, B cells, and natural killer cells. Further, all three chemokines are potent, natural antagonists for chemokine receptor 3 (CCR3) and feature defensin-like, antimirobial activities. In this study, we show that I-TAC, in addition to these effects, acts as an antagonist for CCR5. I-TAC inhibited the binding of macrophage-inflammatory protein-1α (MIP-1α)/CC chemokine ligand 3 (CCL3) to cells transfected with CCR5 and to monocytes. Furthermore, cell migration evoked by regulated on activation, normal T expressed and secreted (RANTES)/CCL5 and MIP-1β/CCL4, the selective agonist of CCR5, was inhibited in transfected cells and monocytes, respectively. In two other functional assays, namely the release of free intracellular calcium and actin polymerization, I-TAC reduced CCR5 activities to minimal levels. Sequence and structure analyses indicate a potential role for K17, K49, and Q51 of I-TAC in CCR5 binding. Our results expand on the potential role of I-TAC as a negative modulator in leukocyte migration and activation, as I-TAC would specifically counteract the responses mediated by many “classical,” inflammatory chemokines that act not only via CCR3 but via CCR5 as well." @default.
- W2003037948 created "2016-06-24" @default.
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- W2003037948 date "2004-06-03" @default.
- W2003037948 modified "2023-09-25" @default.
- W2003037948 title "I-TAC/CXCL11 is a natural antagonist for CCR5" @default.
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- W2003037948 doi "https://doi.org/10.1189/jlb.1103570" @default.
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