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• W1626372642 endingPage "4310" @default.
• W1626372642 startingPage "4299" @default.
• W1626372642 abstract "Abstract To characterize how signaling by TLR ligands can be modulated by non-TLR ligands, murine RAW 264.7 cells were treated with LPS, IFN-γ, 2-methyl-thio-ATP (2MA), PGE2, and isoproterenol (ISO). Ligands were applied individually and in combination with LPS, for 1, 2, and 4 h, and transcriptional changes were measured using customized oligo arrays. We used nonadditive transcriptional responses to dual ligands (responses that were reproducibly greater or less than the expected additive responses) as a measure of pathway interaction. Our analysis suggests that cross-talk is limited; &lt;24% of the features with significant responses to the single ligands responded nonadditively to a dual ligand pair. PGE2 and ISO mainly attenuated, while 2MA enhanced, LPS-induced transcriptional changes. IFN-γ and LPS cross-regulated the transcriptional response induced by each other: while LPS preferentially enhanced IFN-γ-induced changes in gene expression at 1 h, IFN-γ signaling primarily attenuated LPS-induced changes at 4 h. Our data suggest specific cross-talk mechanisms: 1) LPS enhances the expression of IFN-γ- response genes by augmenting STAT1 activity and by activating NF-κB, which synergizes with IFN-γ-induced transcriptional factors; 2) IFN-γ attenuates the late LPS transcriptional response by increasing the expression of suppressor of cytokine signaling 1 and cytokine-inducible SH2-containing protein expression; 3) 2MA modulates LPS secondary transcriptional response by increasing IFN-β and inhibiting IL-10 gene expression; 4) PGE2 and ISO similarly regulate the LPS transcriptional response. They increase IL-10 transcription, resulting in attenuated expression of known IL-10-suppressed genes." @default.
• W1626372642 created "2016-06-24" @default.
• W1626372642 creator A5020674417 @default.
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• W1626372642 creator A5087973343 @default.
• W1626372642 date "2006-10-01" @default.
• W1626372642 modified "2023-10-17" @default.
• W1626372642 title "Dual Ligand Stimulation of RAW 264.7 Cells Uncovers Feedback Mechanisms That Regulate TLR-Mediated Gene Expression" @default.
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