Related Experiment Video
Updated: Jul 6, 2026
A Simple Protocol for Platelet-mediated Clumping of Plasmodium falciparum-infected Erythrocytes in a Resource Poor Setting
Published on: May 16, 2013
Host response to cytoadherence in Plasmodium falciparum
Srabasti J Chakravorty1, Katie R Hughes, Alister G Craig
1Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK.
Abstract:
Cytoadherence of PRBCs (Plasmodium falciparum-infected red blood cells) to host endothelium has been associated with pathology in severe malaria, but, despite extensive information on the primary processes involved in the adhesive interactions, the mechanisms underlying the disease are poorly understood. Endothelial cells have the ability to mobilize immune and pro-adhesive responses when exposed to both PRBCs and TNF (tumour necrosis factor). In addition, there is also an up-regulation by PRBCs and TNF and a concurrent down-regulation of a range of genes involved in inflammation and cell death, by PRBCs and TNF. We propose that the balance between positive and negative regulation will contribute to endothelial pathology during malarial infection. Apposition of PRBCs has been shown by a number of groups to activate signalling pathways. This is dependent, at least in part, on the cytoadherence characteristics of the invading isolate, such that the avidity of the PRBC for the receptor on host endothelium is proportional to the level of activation of the signalling pathways. An understanding of the post-adhesive processes produced by cytoadherence may help us to understand the variable pathology seen in malaria and to design appropriate therapies to alleviate severe disease.
Insights
Severe malaria pathology is linked to Plasmodium falciparum-infected red blood cells (PRBCs) adhering to endothelium. Understanding these cytoadherence interactions and their signaling pathways is crucial for developing effective malaria treatments.
Area of Science:
- Immunology
- Pathology
- Cell Biology
Background:
- Cytoadherence of Plasmodium falciparum-infected red blood cells (PRBCs) to endothelium is implicated in severe malaria pathology.
- Mechanisms linking PRBC adhesion to disease severity remain poorly understood.
- Endothelial cells respond to PRBCs and tumor necrosis factor (TNF) with immune and pro-adhesive responses.
Purpose of the Study:
- To investigate the molecular mechanisms underlying endothelial pathology during malarial infection.
- To explore the role of signaling pathway activation in response to PRBC cytoadherence.
- To correlate PRBC avidity for endothelial receptors with signaling pathway activation.
Main Methods:
- Analysis of gene expression changes (up-regulation and down-regulation) in endothelial cells exposed to PRBCs and TNF.
- Investigation of signaling pathways activated by PRBC-endothelium interactions.
- Assessment of the relationship between PRBC cytoadherence avidity and signaling pathway activation.
Main Results:
- PRBCs and TNF induce both up-regulation of pro-inflammatory/adhesive genes and down-regulation of inflammation/cell death genes in endothelial cells.
- PRBC cytoadherence activates endothelial signaling pathways.
- The avidity of PRBCs for endothelial receptors is proportional to the level of signaling pathway activation.
Conclusions:
- The balance between positive and negative gene regulation contributes to endothelial pathology in malaria.
- Understanding post-adhesive processes driven by cytoadherence is key to explaining variable malaria pathology.
- Elucidating these mechanisms can guide the development of therapies for severe malaria.
