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• W1974426548 abstract "Gene- and signal-specific adaptation/tolerance of blood leukocytes to lipopolysaccharide endotoxin (LPS) occurs during human and animal septicemia. These phenotypes can be modeled in vitro. LPS-TLR4-adapted human THP-1 promonocytic cells cross-adapt to lipoteichoic acid (LTA)-TLR2-induced IL-1beta/TNF-alpha production, suggesting disruption of a common intracellular signaling event(s). A plausible explanation for homologous adaptation of TLR4 with heterologous adaptation of TLR2 is a persistent inactivation and degradation of IRAK1 following TLR4 activation. LTA stimulation of TLR2 also produces homologous adaptation of TLR2 with inactivation of IRAK1, but there is no detectable degradation of IRAK1. Strikingly, such LTA-adapted cells still respond to LPS stimulation of TLR4 with rapid activation and degradation of IRAK1, and robust IL-1beta/TNF-alpha production. Moreover, cells adapted to either LTA- or LPS-production of IL-1beta/TNF-alpha normally produce soluble interleukin 1 receptor antagonist (sIL-1Ra) anti-inflammatory protein when stimulated by either agonist. We conclude that: (i) disruption of a unique TLR2 signaling component upstream of IRAK1, but downstream of TLR2 sensing, induces homologous adaptation to LTA; (ii) disruption of IRAK1 may induce homologous adaptation of TLR4 to LPS and cross-adaptation of TLR2 to LTA; and (iii) TLR2/TLR4 signaling events that control sIL-1Ra translation do not adapt to LPS or LTA, indicating that TLR4 and TLR2 can still function. We present a hypothetical model of adaptation based on a signalsome, with IRAK1 evolving after IRAK4 to regulate TLR4 adaptation tightly." @default.
• W1974426548 created "2016-06-24" @default.
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• W1974426548 date "2003-02-01" @default.
• W1974426548 modified "2023-10-17" @default.
• W1974426548 title "Distinct post-receptor alterations generate gene- and signal-selective adaptation and cross-adaptation of TLR4 and TLR2 in human leukocytes" @default.
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• W1974426548 doi "https://doi.org/10.1179/096805103125001324" @default.
• W1974426548 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12691617" @default.
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