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- W2091284080 abstract "This study investigated the effects of 7-ketocholesterol on interleukin (IL)-6 expression in vascular smooth muscle cells (VSMC). Among the 7 IL examined, only IL-6 transcript was increased by 7-ketocholesterol treatment in human aorta smooth muscle cells. IL-6 transcripts increased up to 24 h after treatment with 7-ketocholesterol, and this effect was profoundly repressed by treatment with p38 MAPK inhibitors and to a lesser extent JNK inhibitors. 7alpha-Hydroxycholesterol, 27-hydroxycholesterol or cholesterol, however, did not induce IL-6 expression. Mechanisms of IL-6 induction by 7-ketocholesterol were investigated in comparison with tumor necrosis factor (TNF)-alpha. Whereas TNF-alpha activated IL-6 promoter, which was impaired by p38 MAPK inhibitors or by mutation in the NF-kappaB-binding site within the promoter region, 7-ketocholesterol did not affect IL-6 promoter activity. Instead, this oxysterol slowed degradation of IL-6 mRNA and increased the amount of cytoplasmic HuR. 7-ketocholesterol significantly increased the amount of intracellular IL-6 protein in the presence of brefeldin A. 7-Ketocholesterol also enhanced IL-6 release from VSMC. IL-6 release by 7-ketocholesterol, although significant, was not as remarkable as that induced by TNF-alpha. These data suggest that 7-ketocholesterol upregulates IL-6 via mechanisms distinct from TNF-alpha and contributes to the intra- and extracellular IL-6 deposits within the vasculature." @default.
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- W2091284080 date "2008-05-31" @default.
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- W2091284080 title "7-Ketocholesterol Upregulates Interleukin-6 via Mechanisms That Are Distinct from Those of Tumor Necrosis Factor-α, in Vascular Smooth Muscle Cells" @default.
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- W2091284080 doi "https://doi.org/10.1159/000135663" @default.
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