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- W4313333870 abstract "Abstract We investigated the immune responses in mice lacking CCR2, CCR5, or macrophage inflammatory protein-1α (MIP-1α), a ligand for CCR5, in two situations: following T cell stimulation or after challenge with Leishmania donovani, an intracellular microbe whose control is dependent on a Th1 immune response. Mice deficient in CCR5, MIP-1α, or CCR2 had reduced IFN-γ responses following ligation of the TCR. Reduced IFN-γ responses following PMA and ionomycin were also observed in CD8+ T cells of CCR5−/− and CCR2−/− mice. During the early phases of infection, all three knockout mice had low Ag-specific IFN-γ responses. However, this reduced IFN-γ response was overcome during a state of persistent Ag stimulation (chronic infection), and was not associated with an adverse parasitologic outcome in any of the gene-targeted mouse strains. To the contrary, during the late phase of infection, an exaggerated Ag-specific IFN-γ response was evident in CCR5−/− and MIP-1α−/− mice, and this correlated with an enhanced control of parasite replication. Although granuloma formation was abnormal in each of the knockout mice, there was no correlation between the number or architecture of the granulomas and parasite burden. Collectively, these findings indicate an important role for CCR5, MIP-1α, and CCR2 in granulomatous inflammation, and that CCR5 and MIP-1α, possibly acting through CCR5, might play a deleterious role in the outcome of chronic L. donovani infection. Our data also suggest that there might be cross-talk between TCR and chemokine receptor signaling pathways." @default.
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- W4313333870 date "1999-11-15" @default.
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- W4313333870 title "Defects in the Generation of IFN-γ Are Overcome to Control Infection with<i>Leishmania donovani</i>in CC Chemokine Receptor (CCR) 5-, Macrophage Inflammatory Protein-1α-, or CCR2-Deficient Mice" @default.
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- W4313333870 doi "https://doi.org/10.4049/jimmunol.163.10.5519" @default.
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