Related Experiment Video
Updated: Sep 27, 2025
A Simple Protocol for Platelet-mediated Clumping of Plasmodium falciparum-infected Erythrocytes in a Resource Poor Setting
Published on: May 16, 2013
Neutrophils impose strong immune pressure against PfEMP1 variants implicated in cerebral malaria
Tamir Zelter1,2, Jacob Strahilevitz3, Karina Simantov2
1Department of Developmental Biology and Cancer Research, Institute for Medical Research Israel Canada, Hebrew University Medical School, Jerusalem, Israel.
Abstract:
Plasmodium falciparum, the deadliest form of human malaria, remains one of the major threats to human health in endemic regions. Its virulence is attributed to its ability to modify infected red blood cells (iRBC) to adhere to endothelial receptors by placing variable antigens known as PfEMP1 on the iRBC surface. PfEMP1 expression determines the cytoadhesive properties of the iRBCs and is implicated in severe malaria. To evade antibody-mediated responses, the parasite undergoes continuous switches of expression between different PfEMP1 variants. Recently, it became clear that in addition to antibody-mediated responses, PfEMP1 triggers innate immune responses; however, the role of neutrophils, the most abundant white blood cells in the human circulation, in malaria remains elusive. Here, we show that neutrophils recognize and kill blood-stage P. falciparum isolates. We identify neutrophil ICAM-1 and specific PfEMP1 implicated in cerebral malaria as the key molecules involved in this killing. Our data provide mechanistic insight into the interactions between neutrophils and iRBCs and demonstrate the important influence of PfEMP1 on the selective innate response to cerebral malaria.
Insights
Neutrophils recognize and kill malaria parasites, specifically Plasmodium falciparum. This interaction involves neutrophil ICAM-1 and PfEMP1 proteins, crucial for combating cerebral malaria.
Area of Science:
- Immunology
- Infectious Diseases
- Parasitology
Background:
- Plasmodium falciparum causes severe malaria by altering infected red blood cells (iRBCs) with PfEMP1 antigens.
- PfEMP1 expression on iRBCs mediates cytoadherence and immune evasion, contributing to malaria severity.
- The role of neutrophils in malaria pathogenesis and parasite clearance is not well understood.
Purpose of the Study:
- To investigate the role of neutrophils in combating blood-stage Plasmodium falciparum.
- To identify the molecular mechanisms underlying neutrophil-mediated killing of iRBCs.
- To elucidate the involvement of PfEMP1 in the innate immune response to cerebral malaria.
Main Methods:
- In vitro assays to assess neutrophil recognition and killing of P. falciparum isolates.
- Identification of key molecular interactions using specific inhibitors and antibodies.
- Analysis of PfEMP1 variants associated with cerebral malaria.
Main Results:
- Neutrophils effectively recognize and kill blood-stage P. falciparum isolates.
- Neutrophil ICAM-1 and specific PfEMP1 variants are critical for parasite killing.
- PfEMP1 plays a significant role in directing the innate immune response against cerebral malaria.
Conclusions:
- Neutrophils are key players in the innate immune defense against Plasmodium falciparum.
- Targeting neutrophil-PfEMP1 interactions could offer new therapeutic strategies for severe malaria.
- Understanding these interactions provides mechanistic insights into cerebral malaria pathogenesis.
