Adhesion of Plasmodium falciparum infected erythrocytes in ex vivo perfused placental tissue: a novel model of placental malaria

Research output: Contribution to journalJournal articleResearchpeer-review

Caroline Pehrson, Line Mathiesen, Kristine K Heno, Ali Salanti, Mafalda dos Santos Marques Resende, Ron Dzikowski, Peter Damm, Stefan R Hansson, Christopher L King, Henning Schneider, Christian W Wang, Thomas Lavstsen, Thor G Theander, Lisbeth E Knudsen, Morten A Nielsen

BACKGROUND: Placental malaria occurs when Plasmodium falciparum infected erythrocytes sequester in the placenta. Placental parasite isolates bind to chondroitin sulphate A (CSA) by expression of VAR2CSA on the surface of infected erythrocytes, but may sequester by other VAR2CSA mediated mechanisms, such as binding to immunoglobulins. Furthermore, other parasite antigens have been associated with placental malaria. These findings have important implications for placental malaria vaccine design. The objective of this study was to adapt and describe a biologically relevant model of parasite adhesion in intact placental tissue.

RESULTS: The ex vivo placental perfusion model was modified to study adhesion of infected erythrocytes binding to CSA, endothelial protein C receptor (EPCR) or a transgenic parasite where P. falciparum erythrocyte membrane protein 1 expression had been shut down. Infected erythrocytes expressing VAR2CSA accumulated in perfused placental tissue whereas the EPCR binding and the transgenic parasite did not. Soluble CSA and antibodies specific against VAR2CSA inhibited binding of infected erythrocytes.

CONCLUSION: The ex vivo model provides a novel way of studying receptor-ligand interactions and antibody mediated inhibition of binding in placental malaria.
Original languageEnglish
Article number292
JournalMalaria Journal
Volume15
Number of pages12
ISSN1475-2875
DOIs
Publication statusPublished - 26 May 2016

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