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• W1993424149 abstract "In macrophages, interleukin-1 (IL-1) and lipopolysaccharide (LPS) enhance the antichlamydial effect of interferon-gamma (IFN-gamma) by increasing indoleamine 2,3-dioxygenase (IDO) activity in a dose-dependent manner. Our objectives were to characterize the antichlamydial effect of tumor necrosis factor-alpha (TNF-alpha) on IFNinduced IDO activity and to establish the relationship between LPS and TNF-alpha in IDO potentiation. TNF-alpha inhibited chlamydial growth in a dose-dependent manner only in IFN-treated macrophages. Furthermore, excess tryptophan reversed the effect of combined cytokine treatment, indicating that IDO alone was responsible for chlamydial inhibition. The promonocyte THP-1 cell line, previously used to model the effect of IL-1 on IDO mRNA expression, was treated with IFN-gamma and increasing concentrations of LPS or TNF-alpha. IDO mRNA was quantified by RT-PCR, and IDO activity was measured by HPLC at 24 and 48 h after treatment, respectively. Both LPS and TNF-alpha enhanced IDO activity and IDO mRNA expression, with maximal IDO induction at 100 ng/ml LPS or 5 ng/ml TNF-alpha. Anti-TNF-alpha failed to neutralize the effects of LPS treatment, and insufficient TNF-alpha or IL-1 was produced by LPS-treated THP-1 cells to account for the enhancing effect of LPS, indicating that the effect of LPS on IDO was independent of TNF-alpha and IL-1." @default.
• W1993424149 created "2016-06-24" @default.
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• W1993424149 date "2000-04-01" @default.
• W1993424149 modified "2023-09-27" @default.
• W1993424149 title "Tumor Necrosis Factor-alpha and Lipopolysaccharide Enhance Interferon-Induced Antichlamydial Indoleamine Dioxygenase Activity Independently" @default.
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• W1993424149 doi "https://doi.org/10.1089/107999000312306" @default.
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