Linking EPCR-Binding PfEMP1 to Brain Swelling in Pediatric Cerebral Malaria

Anne Kessler, Selasi Dankwa, Maria Bernabeu, Visopo Harawa, Samuel A. Danziger, Fergal Duffy, Sam D. Kampondeni, Michael J. Potchen, Nicholas Dambrauskas, Vladimir Vigdorovich, Brian G. Oliver, Sarah E. Hochman, Wenzhu B. Mowrey, Ian J.C. MacCormick, Wilson L. Mandala, Stephen J. Rogerson, D. Noah Sather, John D. Aitchison, Terrie E. Taylor, Karl B. SeydelJoseph D. Smith, Kami Kim

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Brain swelling is a major predictor of mortality in pediatric cerebral malaria (CM). However, the mechanisms leading to swelling remain poorly defined. Here, we combined neuroimaging, parasite transcript profiling, and laboratory blood profiles to develop machine-learning models of malarial retinopathy and brain swelling. We found that parasite var transcripts encoding endothelial protein C receptor (EPCR)-binding domains, in combination with high parasite biomass and low platelet levels, are strong indicators of CM cases with malarial retinopathy. Swelling cases presented low platelet levels and increased transcript abundance of parasite PfEMP1 DC8 and group A EPCR-binding domains. Remarkably, the dominant transcript in 50% of swelling cases encoded PfEMP1 group A CIDRα1.7 domains. Furthermore, a recombinant CIDRα1.7 domain from a pediatric CM brain autopsy inhibited the barrier-protective properties of EPCR in human brain endothelial cells in vitro. Together, these findings suggest a detrimental role for EPCR-binding CIDRα1 domains in brain swelling. Brain swelling is associated with cerebral malaria mortality, but the parasite and host factors responsible for development of brain swelling are unknown. Kessler et al. demonstrate an association of low platelet count and EPCR-binding PfEMP1 with brain swelling in children with cerebral malaria.

Original languageEnglish (US)
Pages (from-to)601-614.e5
JournalCell Host and Microbe
Volume22
Issue number5
DOIs
StatePublished - Nov 8 2017

Keywords

  • EPCR
  • PfEMP1
  • Plasmodium falciparum
  • brain swelling
  • cerebral malaria
  • var

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Virology

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