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• W1969826390 abstract "The innate immune system recognizes microbes by characteristic molecules like the Gram-negative lipopolysaccharide (LPS). Lipid A (the LPS bioactive moiety) signals through toll-like receptors (TLRs) to induce pro-inflammatory molecules and small GTPases of the p47 family involved in intracellular pathogen control. We tested TNF-alpha and p47-GTPase induction in macrophages using classical LPSs [lipid As with glucosamine backbones, ester- and amide-linked C14:0(3-OH) and C12 to C16 in acyloxyacyl groups] of wild type and mutant Escherichia coli and Yersinia species and non-classical LPSs [lipid As with diaminoglucose, ester-linked 3-OH-fatty acids and C28:0(27-OH) and C23:0(29-OH) in acyloxyacyl groups] of plant endosymbionts (Rhizobium), intracellular pathogens (Brucella and Legionella) and phylogenetically related opportunistic bacteria (Ochrobactrum). Classical but not non-classical LPSs efficiently induced TNF-alpha, IIGP and IGTP p47-GTPase expression. Remarkably, the acyloxyacyl groups in classical LPSs necessary to efficiently induce TNF-alpha were not necessary to induce p47-GTPases, suggesting that different aspects of lipid A are involved in this differential induction. This was confirmed by using PPDM2, a non-endotoxic lipid A-structurally related synthetic glycolipid. Despite their different bioactivity, all types of LPSs signalled through TLR-4 and not through TLR-2. However, whereas TNF-alpha induction was myeloid differentiation factor 88 (MyD88)-dependent, that of p47-GTPases occurred via a MyD88-independent pathway. These observations show that different aspects of the LPS pathogen-associated molecular pattern may be triggering different signalling pathways linked to the same TLR. They also reinforce the hypothesis that non-classical lipid As act as virulence factors by favouring the escape from the innate immune system." @default.
• W1969826390 created "2016-06-24" @default.
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• W1969826390 date "2006-03-01" @default.
• W1969826390 modified "2023-10-17" @default.
• W1969826390 title "Differential inductions of TNF-alpha and IGTP, IIGP by structurally diverse classic and non-classic lipopolysaccharides" @default.
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• W1969826390 doi "https://doi.org/10.1111/j.1462-5822.2005.00629.x" @default.
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