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Regulation of complement activation by C-reactive protein.

C Mold1, H Gewurz, T W Du Clos

  • 1Department of Molecular Genetics and Microbiology, University of New Mexico, Albuquerque 87131, USA.

Immunopharmacology
|July 17, 1999
PubMed
Summary
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C-reactive protein (CRP) regulates innate immunity by binding to damaged cells and microbes. Surface-bound CRP recruits factor H, limiting complement system overactivation and inflammation.

Area of Science:

  • Immunology
  • Biochemistry
  • Complement System

Background:

  • C-reactive protein (CRP) is a key mediator of innate immunity.
  • CRP binds to microbial polysaccharides and damaged cell ligands.
  • CRP initiates complement activation via the classical pathway.

Purpose of the Study:

  • To investigate the interaction between CRP and factor H.
  • To elucidate the role of surface-bound CRP in regulating complement pathways.
  • To identify the specific region of CRP involved in factor H binding.

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) to demonstrate factor H binding to CRP and C3b.
  • Use of CRP peptides to map factor H binding sites.
  • Analysis of complement pathway activation and regulation.

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Main Results:

  • Surface-bound CRP directly binds factor H.
  • Factor H binding to CRP is independent of ligand binding sites but is mediated by a specific 13-amino acid peptide region.
  • CRP-bound factor H regulates alternative pathway amplification and C5 convertases, limiting C5b-9 generation.

Conclusions:

  • Surface-bound CRP acts as a docking site for factor H, enhancing complement regulation.
  • This interaction limits excessive complement activation, reducing inflammatory damage.
  • CRP plays a crucial role in balancing immune response and self-protection.