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C4b binding protein negatively regulates TLR1/2 response.

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  • 11 Department of Microbiology and Immunology, Aichi Medical University School of Medicine, Aichi, Japan.

Innate Immunity
|October 30, 2016
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Summary

C4b binding protein (C4BP) inhibits Toll-like receptor 2 (TLR2) activation by blocking pathogen-associated molecular patterns like Pam3CSK4. This discovery reveals C4BP as a crucial negative regulator of TLR1/2-mediated inflammatory responses.

Keywords:
C4b binding proteinPam3CSK4TLR2immune responsepro-inflammatory cytokine

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Area of Science:

  • Immunology
  • Molecular Biology
  • Complement System

Background:

  • Toll-like receptor 2 (TLR2) forms a complex with TLR1 to recognize microbial lipoproteins, such as Pam3CSK4, initiating pro-inflammatory signaling.
  • C4b binding protein (C4BP) is a known inhibitor of the complement pathway.

Purpose of the Study:

  • To investigate the potential role of C4BP in regulating TLR2 signaling.
  • To determine if C4BP interacts with TLR2 and affects TLR2-mediated immune responses.

Main Methods:

  • Immunoprecipitation assays to detect C4BP binding to TLR2.
  • Analysis of pro-inflammatory cytokine (IL-6, IL-8) levels in C4BP-deficient and wild-type mice.
  • Assessment of Pam3CSK4 binding to TLR1/2 in the presence of C4BP.
  • Evaluation of Pam3CSK4-induced signaling in cells treated with exogenous C4BP.

Main Results:

  • C4BP was identified as a TLR2-associated molecule, binding directly to TLR2.
  • Pam3CSK4-induced IL-6 production was elevated in C4BP-deficient mice.
  • C4BP expression reduced Pam3CSK4-induced IL-8 production in a dose-dependent manner.
  • C4BP was shown to block the binding of Pam3CSK4 to TLR1/2 and inhibit downstream signaling.

Conclusions:

  • C4b binding protein (C4BP) acts as a negative regulator of TLR1/2 signaling.
  • C4BP directly binds to TLR2, inhibiting the recognition of lipoproteins and subsequent pro-inflammatory cytokine production.
  • C4BP represents a novel therapeutic target for modulating TLR-mediated inflammation.