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- W2025837783 abstract "Ozone (O(3)) is a major component of smog and an inhaled toxicant to the lung. O(3) rapidly reacts with the airway epithelial cell membrane phospholipids to generate lipid ozonation products (LOP). 1-Hydroxy-1-hydroperoxynonane (HHP-C9) is an important LOP, produced from the ozonation of 1-palmitoyl-2-oleoyl-sn-glycerol-3-phosphatidylcholine. This LOP, at a biologically relevant concentration (100 microM), increases the activity of phospholipase C, nuclear factors-kappaB (NF-kappaB), and interleukin-6 (NF-IL-6) and the expression of the inflammatory gene, interleukin-8 (IL-8) in a cultured human bronchial epithelial cell line (BEAS-2B). The signaling pathways of ozone and its biologically-active products are as yet undefined. In the present study, we report that the HHP LOP, HHP-C9 (100 microM x 4 h), activated the expression of IL-8 (218 +/- 26% increase over control, n = 4, P < 0.01) through an apparent interaction between the two transcription factors, NF-kappaB and NF-IL-6. Transfection studies using luciferase reporter assays demonstrated that HHP-C9 induced a significant increase in NF-kappaB-DNA binding activity (37 +/- 7% increase over control, n = 6, P < 0.05). Inhibition of NF-kappaB showed a statistically significant but modest decrease in IL-8 release, which suggested a role for another transcription factor, NF-IL-6. Exposure of BEAS-2B cells to HHP-C9 induced a significant increase in the DNA binding activity of NF-IL-6 (45 +/- 11% increase over control, n = 6, P < 0.05). The results of the present study indicate that NF-IL-6 interacts with NF-kappaB in regulating the expression of IL-8 in cultured human airway epithelial cells exposed to LOP, the biological products of ozone in the lung." @default.
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- W2025837783 date "2007-01-01" @default.
- W2025837783 modified "2023-09-26" @default.
- W2025837783 title "Activation of transcription factor IL-6 (NF-IL-6) and nuclear factor-κB (NF-κB) by lipid ozonation products is crucial to interleukin-8 gene expression in human airway epithelial cells" @default.
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- W2025837783 doi "https://doi.org/10.1002/tox.20246" @default.
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