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Updated: Jul 21, 2025
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A Simple Protocol for Platelet-mediated Clumping of Plasmodium falciparum-infected Erythrocytes in a Resource Poor Setting
Published on: May 16, 2013
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Knobs, Adhesion, and Severe Falciparum Malaria
1Department of Tropical Medicine and Infectious Disease, Tulane University School of Public Health and Tropical Medicine, 1440 Canal Street, New Orleans, LA 70112, USA.
Tropical Medicine and Infectious Disease
|July 28, 2023
Summary
Severe malaria from Plasmodium falciparum is linked to infected red blood cells sticking to tissues. This cytoadherence, mediated by PfEMP1 proteins, allows the parasite to evade immunity and cause chronic infections.
Area of Science:
- Malariology
- Immunology
- Cell Biology
Background:
- Plasmodium falciparum causes severe malaria with high mortality.
- Infected erythrocyte sequestration in capillaries contributes to virulence.
- Cytoadherence of infected erythrocytes to endothelial cells is mediated by PfEMP1.
Purpose of the Study:
- To understand the role of PfEMP1 in P. falciparum virulence.
- To explore the mechanism of infected erythrocyte sequestration.
- To investigate the contribution of antigenic variation to chronic infection and disease manifestation.
Main Methods:
- Analysis of PfEMP1 structure and function.
- Study of knob formation on infected erythrocytes.
- Investigation of var gene expression and allelic exclusion.
- Examination of PfEMP1 binding to endothelial cell receptors.
Main Results:
- PfEMP1, expressed on knobs, mediates cytoadherence.
- Antigenic variation through var gene expression allows immune evasion.
- Different PfEMP1 alleles bind to various endothelial receptors.
- Altered cytoadherence phenotypes lead to sequestration in different tissues.
Conclusions:
- PfEMP1-mediated cytoadherence and antigenic variation are key to P. falciparum virulence.
- Sequestration in diverse tissues explains varied clinical presentations of severe malaria.
- Targeting PfEMP1 or var gene expression could be therapeutic strategies.
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