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Activation of complement by cold agglutinins
M Kirschfink1, K Knoblauch, D Roelcke
1Institut für Immunologie, Universität, Heidelberg, FRG.
Infusionstherapie Und Transfusionsmedizin
|December 1, 1994
Summary
Cold agglutinins initiate complement activation, leading to red blood cell clearance. While not always causing direct hemolysis, this interaction impacts cold agglutinin disease progression.
Area of Science:
- Immunology
- Hematology
Background:
- Cold agglutinins are autoantibodies that bind red blood cells at low temperatures.
- Their interaction with the complement system is crucial in cold agglutinin disease.
Purpose of the Study:
- To review recent findings on cold agglutinin and complement system interactions.
- To understand the relevance of these interactions in cold agglutinin disease.
Main Methods:
- Literature review of original papers and review articles.
- Focus on in vitro experimental data and clinical findings.
- Analysis of cold agglutinin-induced complement activation mechanisms.
Main Results:
- Most cold agglutinins (IgM, anti-I specificity) initiate complement's classical pathway (C1, C4 fixation).
- Hemolytic efficiency is observed with heterologous complement, indicating complement activation potential.
- Thermal amplitude and membrane protein interactions influence in vivo hemolytic activity.
Conclusions:
- Cold agglutinin complement fixation (up to C3) accelerates red blood cell clearance via hepatic sequestration.
- The precise role of the reticuloendothelial system and cell fate remains unclear.
- Membrane-bound C3 fragments may offer protection against further complement attack.