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• W1599185640 endingPage "1966" @default.
• W1599185640 startingPage "1956" @default.
• W1599185640 abstract "Abstract Human newborns are susceptible to microbial infection and mount poor vaccine responses, yet the mechanisms underlying their susceptibility are incompletely defined. We have previously reported that despite normal basal expression of TLRs and associated signaling intermediates, human neonatal cord blood monocytes demonstrate severe impairment in TNF-α production in response to triacylated (TLR 2/1) and diacylated (TLR 2/6) bacterial lipopeptides (BLPs). We now demonstrate that in marked contrast, BLP-induced synthesis of IL-6, a cytokine with anti-inflammatory and Th2-polarizing properties, is actually greater in neonates than adults. Remarkably, newborn blood plasma confers substantially reduced BLP-induced monocyte synthesis of TNF-α, while preserving IL-6 synthesis, reflecting the presence in neonatal blood plasma of a soluble, low molecular mass inhibitory factor (&lt;10 kDa) that we identify as adenosine, an endogenous purine metabolite with immunomodulatory properties. The neonatal adenosine system also inhibits TNF-α production in response to whole microbial particles known to express TLR2 agonist activity, including Listeria monocytogenes, Escherichia coli (that express BLPs), and zymosan particles. Selective inhibition of neonatal TNF-α production is due to the distinct neonatal adenosine system, including relatively high adenosine concentrations in neonatal blood plasma and heightened sensitivity of neonatal mononuclear cells to adenosine A3 receptor-mediated accumulation of cAMP, a second messenger that inhibits TLR-mediated TNF-α synthesis but preserves IL-6 production. We conclude that the distinct adenosine system of newborns polarizes TLR-mediated cytokine production during the perinatal period and may thereby modulate their innate and adaptive immune responses." @default.
• W1599185640 created "2016-06-24" @default.
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• W1599185640 date "2006-08-01" @default.
• W1599185640 modified "2023-10-03" @default.
• W1599185640 title "The Adenosine System Selectively Inhibits TLR-Mediated TNF-α Production in the Human Newborn" @default.
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• W1599185640 doi "https://doi.org/10.4049/jimmunol.177.3.1956" @default.
• W1599185640 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2881468" @default.
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