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• W1595279671 abstract "Toxoplasma gondii is an obligate intracellular parasite that persists for the life of a mammalian host. The parasite's ability to block the potent IFN-gamma response may be one of the key mechanisms that allow Toxoplasma to persist. Using a genome-wide microarray analysis, we show here a complete dysregulation of IFN-gamma-inducible gene expression in human fibroblasts infected with Toxoplasma. Notably, 46 of the 127 IFN-gamma-responsive genes were induced and 19 were suppressed in infected cells before they were exposed to IFN-gamma, indicating that other stimuli produced during infection may also regulate these genes. Following IFN-gamma treatment, none of the 127 IFN-gamma-responsive genes could be significantly induced in infected cells. Immunofluorescence assays showed at single-cell levels that infected cells, regardless of which Toxoplasma strain was used, could not be activated by IFN-gamma to up-regulate the expression of IFN regulatory factor 1, a transcription factor that is under the direct control of STAT1, whereas uninfected cells in the same culture expressed IFN regulatory factor 1 normally in response to IFN-gamma. STAT1 trafficked to the nucleus normally and indistinguishably in all uninfected and infected cells treated with IFN-gamma, indicating that the inhibitory effects of Toxoplasma infection likely occur via blocking STAT1 transcriptional activity in the nucleus. In contrast, a closely related apicomplexan, Neospora caninum, was unable to inhibit IFN-gamma-induced gene expression. A differential ability to interfere with the IFN-gamma response may, in part, account for the differences in the pathogenesis seen among Toxoplasma and Neospora parasite strains." @default.
• W1595279671 created "2016-06-24" @default.
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• W1595279671 date "2007-04-15" @default.
• W1595279671 modified "2023-10-17" @default.
• W1595279671 title "<i>Toxoplasma gondii</i> Dysregulates IFN-γ-Inducible Gene Expression in Human Fibroblasts: Insights from a Genome-Wide Transcriptional Profiling" @default.
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• W1595279671 doi "https://doi.org/10.4049/jimmunol.178.8.5154" @default.
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