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The antimicrobial activity of C-reactive protein

Alexander J Szalai1

  • 1Division of Clinical Immunology and Rheumatology, Department of Medicine, The University of Alabama at Birmingham, Birmingham, AL 35294-0006, USA. Alex.Szalai@ccc.uab.edu

Microbes and Infection
|March 7, 2002
PubMed

Insights

C-reactive protein (CRP) protects against microbial pathogens in mice. This protection requires the complement alternative pathway but not FcgammaRI, despite CRP

Area of Science:

  • Immunology
  • Microbiology
  • Complement System

Background:

  • C-reactive protein (CRP) is known to bind microbes and activate the complement system.
  • Previous research suggests CRP plays a role in host defense against pathogens.

Purpose of the Study:

  • To investigate the protective mechanisms of CRP against microbial pathogens in a transgenic mouse model.
  • To determine the specific roles of complement pathways and Fc receptors in CRP-mediated protection.

Main Methods:

  • Utilized transgenic mice expressing human CRP.
  • Administered microbial pathogens to assess protection.
  • Investigated the involvement of complement classical and alternative pathways.
  • Assessed the necessity of FcgammaRI and FcgammaRII receptors.

Main Results:

  • Transgenic mice expressing CRP showed protection against microbial pathogens.
  • Complement activation via the alternative pathway was essential for this protection.
  • FcgammaRI engagement was found to be dispensable for CRP-mediated protection in vivo.
  • CRP's in vitro ability to activate the complement classical pathway and engage FcgammaRI/II was confirmed.

Conclusions:

  • CRP confers protection against microbial pathogens in vivo.
  • Complement alternative pathway activation is critical for CRP's protective function.
  • FcgammaRI is not required for CRP-mediated protection in this model, highlighting pathway-specific roles.

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