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• W2030892259 abstract "Endotoxin or lipopolysaccharide (LPS) tolerance may be partially due to the secretion of potent anti-inflammatory cytokines following severe Gram-negative infections, or by low doses of LPS. In this work, we describe the effects of interleukin-1 (IL-1) and tumour necrosis factor alpha (TNF-), two early cytokines secreted after LPS exposure, in the induction of LPS tolerance. Our results demonstrate that mice treated with three daily doses of 100 ng of IL-1 were tolerant to LPS-induced shock. However, TNF- was unable to induce an LPS refractory state. Given the fact that 100 ng of IL-1 increase the plasma levels of glucocorticoids, we evaluated whether a daily injection of dexamethasone (DEX) alone was able to reproduce the LPS-like tolerant state. However, no signs of LPS refractoriness were detected, except when DEX was administered concomitantly with a dose of IL-1 that does not induce corticosterone secretion (12 ng/mouse). This dose was found to induce in vitro up-regulation of the glucocorticoid receptors (GcR) of peritoneal macrophages following 24 h of treatment. In addition, we demonstrate that IL-1 is capable of inducing the down-regulation of Toll-like receptor 4 (TLR4), a crucial molecule in the signal transduction of LPS. Taken together, our results indicate that IL-1 can generate tolerance to LPS in vivo, and suggest that the regulation of mechanisms of the down-regulation of TLR4, as well as those involved in the expression of GcR and/or in the secretion of glucocorticoids, would be crucial for these effects." @default.
• W2030892259 created "2016-06-24" @default.
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• W2030892259 date "2002-05-01" @default.
• W2030892259 modified "2023-09-30" @default.
• W2030892259 title "Interleukin-1β induces<i>in vivo</i>tolerance to lipopolysaccharide in mice" @default.
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• W2030892259 doi "https://doi.org/10.1046/j.1365-2249.2002.01828.x" @default.
• W2030892259 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1906386" @default.
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