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A micro-bead device to explore Plasmodium falciparum-infected, spherocytic or aged red blood cells prone to mechanical retention by spleen endothelial slits

Experimental tools to identify human red blood cells (RBC) prone to mechanical retention upstream from the spleen venous sinus inter-endothelial slits are currently suboptimal. We designed a micro-bead device mimicking the geometry of the human narrow and short inter-endothelial slits. Upon filtration through a mixture of 5-25 μm diameter micro-beads, Plasmodium falciparum-hosting RBC (Pf-RBC) were retained in a parasite developmental stage-dependent way, the retention rates of a subset of ring-RBC being similar in micro-beads and in isolated-perfused human spleens. We found that this retention might be linked principally to the reduced surface-area-to-volume ratio of Pf-RBC. Interestingly, other rigid RBC, such as heat-treated RBC, and RBC from hereditary spherocytosis patients were also retained in micro-beads without any hemolysis. Micro-beads allow (i) depletion of heterogeneous RBC population from its rigid-RBC subpopulation ii) characteriziation of distinct molecular signatures of rigid versus deformable RBC subpopulations. This simple method portends wide medical applications, such as improving the quality of stored RBC concentrates prior to transfusion.

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Correspondence to Innocent Safeukui.

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Guillaume Deplaine, Innocent Safeukui contributed equally to this work.

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This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Deplaine, G., Safeukui, I., Jeddi, F. et al. A micro-bead device to explore Plasmodium falciparum-infected, spherocytic or aged red blood cells prone to mechanical retention by spleen endothelial slits. Malar J 9, O10 (2010). https://doi.org/10.1186/1475-2875-9-S2-O10

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Keywords

  • Blood Cell
  • Infectious Disease
  • Plasmodium
  • Medical Application
  • Retention Rate

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