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- W2008382495 abstract "Background & Aims: Interferon (IFN)-γ plays an important role in the immunologic control of infection by the protozoan enteropathogen Cryptosporidium parvum. We tested the hypothesis that IFN-γ may directly inhibit infection of enterocytes by this pathogen. Methods: HT-29, Caco-2, and H4 human enterocyte cell lines were grown in monolayers and incubated with IFN-γ before exposure with C. parvum. IFN-γ receptor expression in the cell lines was determined by Western blot analysis. Results: IFN-γ inhibited C. parvum infection of both HT-29 and Caco-2 cells but not H4 cells. Response to IFN-γ was related to the expression of the IFN-γ receptor in the respective cell lines. The effect of IFN-γ was partially reversed by inhibition of the JAK/STAT signaling pathway. IFN-γ mediated its action by at least 2 mechanisms: (1) inhibition of parasite invasion and (2) by modification of intracellular Fe2+ concentration. No role for tryptophan starvation or nitric oxide synthase activity was found. TNF-α and IL-1β also had anti–C. parvum activity but had no synergistic effect with IFN-γ. Conclusions: IFN-γ directly induces enterocyte resistance against C. parvum infection; this observation may have important consequences for our understanding of the mucosal immune response to invasive pathogens.GASTROENTEROLOGY 2001;120:99-107" @default.
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- W2008382495 date "2001-01-01" @default.
- W2008382495 modified "2023-10-05" @default.
- W2008382495 title "Interferon gamma induces enterocyte resistance against infection by the intracellular pathogen Cryptosporidium parvum" @default.
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- W2008382495 doi "https://doi.org/10.1053/gast.2001.20907" @default.
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