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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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Monomeric C-reactive protein modulates classic complement activation on necrotic cells.

Michael Mihlan¹, Anna M Blom, Koba Kupreishvili

¹Department of Infection Biology, Leibniz Institute for Natural Products Research and Infection Biology, Beutenbergstrasse 11a, 07745 Jena, Germany.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology

|August 23, 2011

Summary

Monomeric C-reactive protein (CRP) binds complement inhibitors like C4b-binding protein (C4bp), controlling complement activation on damaged cells. This interaction balances inflammation during conditions like heart attack.

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Area of Science:

Immunology
Complement System
Cardiovascular Research

Background:

C-reactive protein (CRP) initiates complement activation on damaged cells via C1q.
CRP also recruits complement inhibitors (C4bp, Factor H) to limit inflammation.
The distinct roles of monomeric CRP (mCRP) and pentameric CRP (pCRP) in complement modulation require clarification.

Purpose of the Study:

To define how CRP modulates the classic complement pathway.
To investigate the interaction between CRP and the complement inhibitor C4b-binding protein (C4bp).
To explore the role of mCRP, C1q, and C4bp in acute myocardial infarction.

Main Methods:

Studied the interaction of CRP with C4bp in vitro.
Investigated mCRP generation from pCRP on necrotic cells.
Detected mCRP, pCRP, C4bp, C1q, and C4d in myocardial infarction tissue.

Main Results:

Monomeric CRP (mCRP), but not pentameric CRP (pCRP), binds C4bp and enhances C4b/C3b degradation.
C1q and C4bp compete for mCRP binding, regulating complement activation and inhibition.
mCRP, pCRP, C4bp, C1q, and C4d were detected in acute myocardial infarction tissue, with elevated levels post-infarction.

Conclusions:

mCRP plays a dual role by recruiting both C1q (activator) and C4bp (inhibitor) to damaged cells.
This interaction balances complement activation and inhibition, controlling inflammation.
mCRP, C1q, and C4bp are biologically relevant in the context of acute myocardial infarction.