alexa Negative regulation of toll-like receptor-mediated signaling by Tollip.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Stem Cell Research & Therapy

Author(s): Zhang G, Ghosh S

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Abstract Toll-like receptor (TLR)-mediated recognition of pathogens represents one of the most important mechanisms of innate immunity and disease resistance. The adaptor protein Tollip was identified initially as an intermediate in interleukin (IL)-1 signaling. Here we report that Tollip also associates directly with TLR2 and TLR4 and plays an inhibitory role in TLR-mediated cell activation. Inhibition by Tollip is mediated through its ability to potently suppress the activity of IL-1 receptor-associated kinase (IRAK) after TLR activation. In addition, we show for the first time that Tollip is a bona fide substrate for IRAK and is phosphorylated by IRAK upon stimulation with lipopolysaccharide or IL-1. Negative regulation of TLR signaling by Tollip may therefore serve to limit the production of proinflammatory mediators during inflammation and infection. This article was published in J Biol Chem and referenced in Journal of Stem Cell Research & Therapy

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