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C4b-binding protein negatively regulates TLR4/MD-2 response but not TLR3 response.

FEBS Lett.2017 Jun;591(12):1732-1741. doi:10.1002/1873-3468.12693. Epub 2017 Jun 12
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摘要


Recently, we reported a novel function for C4b-binding protein (C4BP) in inhibiting the toll-like receptor (TLR)1/2 response by interacting with TLR2. TLRs share a common structure; hence, we examined the effect of C4BP on activation of other TLRs-TLR4 and TLR3. The results of immunoprecipitation assays suggest that C4BP interacts with TLR4/MD-2 but not TLR3. C4BP inhibits TLR4/MD-2-mediated, but not TLR3-mediated, proinflammatory cytokine production and nuclear factor (NF)-κB signaling. C4BP-deficient mice show increased interleukin (IL)-6 production in response to the TLR4/MD-2 ligand. A competition assay revealed that C4BP prevents an interaction between TLR4/MD-2 and its ligand. These findings indicate that C4BP binds to cell surface TLRs and inhibits the TLR-TLR ligand interaction, thereby inhibiting TLR activation.

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