Plasmodium falciparum EPCR-binding PfEMP1 expression increases with malaria disease severity and is elevated in retinopathy negative cerebral malaria. 2017

Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
Ryan White Center for Pediatric Infectious Diseases and Global Health, Indiana University, 1044 W Walnut St R4 402D, Indianapolis, Indiana, USA.

Expression of group A and the A-like subset of group B Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) is associated with severe malaria (SM). The diversity of var sequences combined with the challenges of distinct classification of patient pathologies has made studying the role of distinct PfEMP1 variants on malaria disease severity challenging. The application of retinopathy in the recent years has provided a further method to clinically evaluate children with cerebral malaria (CM). The question of whether children with clinical CM but no retinopathy represent a completely different disease process or a subgroup within the spectrum of CM remains an important question in malaria. In the current study, we use newly designed primer sets with the best coverage to date in a large cohort of children with SM to determine the role of var genes in malaria disease severity and especially CM as discriminated by retinopathy. We performed qRT-PCR targeting the different subsets of these var genes on samples from Ugandan children with CM (n = 98, of whom 50 had malarial retinopathy [RP] and 47 did not [RN]), severe malarial anemia (SMA, n = 47), and asymptomatic parasitemia (AP, n = 14). The primers used in this study were designed based on var sequences from 226 Illumina whole genome sequenced P. falciparum field isolates. Increasing severity of illness was associated with increasing levels of endothelial protein C receptor (EPCR)-binding PfEMP1. EPCR-binding PfEMP1 transcript levels were highest in children with combined CM and SMA and then decreased by level of disease severity: RP CM > RN CM > SMA > AP. The study findings indicate that PfEMP1 binding to EPCR is important in the pathogenesis of SM, including RN CM, and suggest that increased expression of EPCR-binding PfEMP1 is associated with progressively more severe disease. Agents that block EPCR-binding of PfEMP1 could provide novel interventions to prevent or decrease disease severity in malaria.

UI MeSH Term Description Entries
D007223 Infant A child between 1 and 23 months of age. Infants
D008297 Male Males
D010963 Plasmodium falciparum A species of protozoa that is the causal agent of falciparum malaria (MALARIA, FALCIPARUM). It is most prevalent in the tropics and subtropics. Plasmodium falciparums,falciparums, Plasmodium
D011446 Prospective Studies Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group. Prospective Study,Studies, Prospective,Study, Prospective
D011485 Protein Binding The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments. Plasma Protein Binding Capacity,Binding, Protein
D011956 Receptors, Cell Surface Cell surface proteins that bind signalling molecules external to the cell with high affinity and convert this extracellular event into one or more intracellular signals that alter the behavior of the target cell (From Alberts, Molecular Biology of the Cell, 2nd ed, pp693-5). Cell surface receptors, unlike enzymes, do not chemically alter their ligands. Cell Surface Receptor,Cell Surface Receptors,Hormone Receptors, Cell Surface,Receptors, Endogenous Substances,Cell Surface Hormone Receptors,Endogenous Substances Receptors,Receptor, Cell Surface,Surface Receptor, Cell
D012164 Retinal Diseases Diseases involving the RETINA. Disease, Retinal,Diseases, Retinal,Retinal Disease
D002648 Child A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL. Children
D002675 Child, Preschool A child between the ages of 2 and 5. Children, Preschool,Preschool Child,Preschool Children
D005260 Female Females

Related Publications

Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
October 2016, Scientific reports,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
November 2017, Cell host & microbe,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
June 2017, The Journal of infectious diseases,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
December 2014, PLoS pathogens,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
January 2020, Immunological reviews,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
October 2007, Proceedings of the National Academy of Sciences of the United States of America,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
June 1995, Infection and immunity,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
April 1995, The Journal of infectious diseases,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
March 2014, BMC infectious diseases,
Estela Shabani, and Benjamin Hanisch, and Robert O Opoka, and Thomas Lavstsen, and Chandy C John
June 1996, Lancet (London, England),
Copied contents to your clipboard!