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Human complement receptor type 1 (CR1) binds to a major malarial adhesin

Malgorzata Krych-Goldberg1, Joann M Moulds, John P Atkinson

  • 1Division of Rheumatology, Washington University School of Medicine, St. Louis, MO 63110, USA.

Trends in Molecular Medicine
|November 8, 2002
PubMed

Insights

Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) causes infected red blood cells to stick together, a process called rosetting. This interaction with complement receptor type 1 (CR1) on healthy red blood cells is key to malaria pathogenesis.

Area of Science:

  • Immunology
  • Parasitology
  • Molecular Biology

Background:

  • Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) is a major adhesin on infected erythrocytes.
  • PfEMP1 mediates cytoadherence to endothelial cells and rosetting with uninfected erythrocytes.
  • Rosetting sequesters parasites in microvasculature, evading host immunity.

Purpose of the Study:

  • To investigate the interaction between PfEMP1 and complement receptor type 1 (CR1) on uninfected erythrocytes.
  • To understand the role of CR1 in malaria pathogenesis and parasite sequestration.

Main Methods:

  • Analysis of PfEMP1 interactions with erythrocyte receptors.
  • Epidemiological data on CR1 antigen frequencies in malaria-exposed populations.
  • Comparative analysis of CR1 structure between humans and non-human primates.

Main Results:

  • Evidence suggests direct interaction between PfEMP1 and CR1 on uninfected erythrocytes.
  • Increased frequency of specific CR1 blood-group antigens in African populations exposed to malaria.
  • Structural variations in primate CR1 may be driven by selective pressure from malaria.

Conclusions:

  • CR1 plays a significant role in malaria pathogenesis.
  • PfEMP1-CR1 interactions contribute to parasite sequestration and disease severity.
  • Malaria has exerted selective pressure on CR1 evolution in human populations.

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