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- W1971662379 abstract "Abstract The activation of murine dendritic cells by Toxoplasma gondii has recently been shown to depend on a parasite protein that signals through the chemokine receptor CCR5. Here we demonstrate that this molecule, cyclophilin-18 (C-18), is an inhibitor of HIV-1 cell fusion and infection with cell-free virus. T gondii C-18 efficiently blocked syncytium formation between human T cells and effector cells expressing R5 but not X4 envelopes. Neither human nor Plasmodium falciparum cyclophilins possess such inhibitory activity. Importantly, C-18 protected peripheral blood leukocytes from infection with multiple HIV-1 R5 primary isolates from several clades. C-18 bound directly to human CCR5, and this interaction was partially competed by the β-chemokine macrophage inflammatory protein 1β (MIP-1β) and by HIV-1 R5 gp120. In contrast to several other antagonists of HIV coreceptor function, C-18 mediated inhibition did not induce β-chemokines or cause CCR5 downmodulation, suggesting direct blocking of envelope binding to the receptor. These data support the further development of C-18 derivatives as HIV-1 inhibitors for preventing HIV-1 transmission and for postexposure prophylaxis." @default.
- W1971662379 created "2016-06-24" @default.
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- W1971662379 date "2003-11-01" @default.
- W1971662379 modified "2023-10-18" @default.
- W1971662379 title "Inhibition of HIV-1 infection by a CCR5-binding cyclophilin from Toxoplasma gondii" @default.
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- W1971662379 doi "https://doi.org/10.1182/blood-2003-04-1096" @default.
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