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Reduced immune complex binding capacity and increased complement susceptibility of red cells from children with

Boaz O Owuor1, Collins O Odhiambo, Walter O Otieno

  • 1The US Army Medical Research Unit, Kenya, and the Kenya Medical Research Institute, Nairobi, Kenya.

Molecular Medicine (Cambridge, Mass.)
|March 5, 2008
PubMed

Insights

Children with severe malaria-associated anemia (SMA) show deficiencies in red blood cell complement regulatory proteins, impairing immune complex binding and increasing complement deposition. These findings highlight a potential mechanism for red blood cell damage in severe malaria.

Area of Science:

  • Immunology
  • Hematology
  • Infectious Diseases

Background:

  • Plasmodium falciparum malaria is a leading cause of mortality, particularly in children.
  • Severe malaria complications include severe anemia and cerebral malaria.
  • Red blood cells (erythrocytes) play a role in regulating complement activation and clearing immune complexes.

Purpose of the Study:

  • To investigate the functional consequences of deficiencies in red cell complement regulatory proteins in children with severe malaria-associated anemia (SMA).
  • To determine if these deficiencies affect immune complex binding and complement activation.
  • To compare these findings with children suffering from cerebral malaria (CM).

Main Methods:

  • Studied 75 children with SMA and 74 uncomplicated malaria controls from Kenya.
  • Recruited 32 children with CM and 52 controls.
  • Assessed red cell complement receptor 1 (CR1) and decay accelerating factor (DAF, CD55) levels, immune complex binding capacity, and C3b deposition.
  • Utilized in vivo and ex vivo analyses.

Main Results:

  • Children with SMA exhibited deficiencies in red cell CR1 and CD55.
  • These deficiencies correlated with a significant reduction in immune complex binding capacity.
  • Increased C3b deposition was observed in erythrocytes from children with SMA, indicating heightened complement activation.
  • These specific changes were not observed in children with cerebral malaria or their controls.

Conclusions:

  • Deficiencies in red cell CR1 and CD55 in children with SMA are functionally significant.
  • These deficiencies impair the erythrocytes' ability to bind immune complexes and regulate complement.
  • This may predispose erythrocytes to complement-mediated damage and phagocytosis, contributing to severe anemia in malaria.

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