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- W2075091661 abstract "Members of the interleukin (IL)-12 family constitute subunits of IL-12, -23, and -27. These ILs represent pivotal mediators in the regulation of cell-mediated immune responses and in animal models of human inflammatory bowel disease. Recent work has suggested that intestinal endothelial cells might serve as a second line of defense in bacterial sensing of invading pathogens. The purpose of this study was to examine the production of IL-12 family members in intestinal endothelial cells (HIMEC). HIMEC were stimulated with proinflammatory agents (TNF-alpha, IFN-gamma, IL-1beta) and microbial antigens [LPS, lipoteichoic acid, peptidoglycan, CpG-DNA, flagellin, poly(I:C)]. Expression of IL-12 family members and of Toll-like receptor (TLR)3 in HIMEC was assessed by real-time RT-PCR, immunostaining, flow cytometry, and immunoblot analysis. HIMEC display an induction of Epstein-Barr virus-induced gene 3 (EBI3), IL-12p35, and IL-23p19, whereas no expression of IL-12p40 and IL-27p28 was detectable. The strongest induction was induced by proinflammatory factors known to utilize the NF-kappaB pathway, and expression of EBI3 and IL-23p19 was diminished by an NF-kappaB inhibitor. HIMEC display regulated expression of TLR3. Adhesion and transmigration assays showed proinflammatory responses after HIMEC stimulation. HIMEC are capable of producing IL-12 family members as a response to microbial stimuli. The TLR3 agonist, poly(I:C), was shown to enhance leukocyte adhesion in vitro in HIMEC. Our data suggest that the intestinal microvasculature is responsive to ligands of TLR3 expressed on intestinal endothelial cells, thereby adding to the regulation of adaptive immunity and leukocyte recruitment." @default.
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- W2075091661 date "2007-12-01" @default.
- W2075091661 modified "2023-09-27" @default.
- W2075091661 title "Expression of IL-12-related molecules in human intestinal microvascular endothelial cells is regulated by TLR3" @default.
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- W2075091661 doi "https://doi.org/10.1152/ajpgi.00142.2007" @default.
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