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- W2021043148 abstract "Transforming growth factor-β (TGF-β) is a potent anti-inflammatory cytokine that regulates interleukin-1 receptor and Toll-like receptor (TLR) signalling. Here we show a novel mechanism where TGF-β1-induced K48-linked polyubiquitination and degradation of the adaptor MyD88 protein is dependent on the Smad6 protein, but not Smad7, and mediated by recruitment of the Smad ubiquitin regulator factor proteins, Smurf1 and Smurf2, which have E3-ubiquitin ligase activity. Smurf1 interaction with MyD88 appears to be mediated by Smad6, and Smurf2 interaction by Smurf1. Knockdown of endogenous Smurf1 or Smurf2 by RNA interference significantly suppresses the anti-inflammatory effects of TGF-β1 by preventing lipopolysaccharide-induced NF-κB nuclear translocation, resulting in de-suppression of pro-inflammatory gene expression. Similar effects are observed on the lipoteichoic-acid-induced TLR2 pathway, which is also MyD88-dependent, but not the MyD88-independent TLR3 pathway. Thus, our results suggest that MyD88 degradation driven by the Smad6-Smurf pathway is a novel mechanism for TGF-β1-mediated negative regulation of MyD88-dependent pro-inflammatory signalling." @default.
- W2021043148 created "2016-06-24" @default.
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- W2021043148 date "2011-09-06" @default.
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- W2021043148 title "Smad6-specific recruitment of Smurf E3 ligases mediates TGF-β1-induced degradation of MyD88 in TLR4 signalling" @default.
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- W2021043148 doi "https://doi.org/10.1038/ncomms1469" @default.
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