Acquisition of IgG to ICAM-1-Binding DBLβ Domains in the Plasmodium falciparum erythrocyte membrane protein 1 antigen family varies between Groups A, B, and C

TY - JOUR

T1 - Acquisition of IgG to ICAM-1-Binding DBLβ Domains in the Plasmodium falciparum erythrocyte membrane protein 1 antigen family varies between Groups A, B, and C

AU - Olsen, Rebecca W

AU - Ecklu-Mensah, Gertrude

AU - Bengtsson, Anja

AU - Ofori, Michael F

AU - Kusi, Kwadwo A

AU - Koram, Kwadwo A

AU - Hviid, Lars

AU - Adams, Yvonne

AU - Jensen, Anja T R

N1 - Copyright © 2019 Olsen et al.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) is an important malaria virulence factor. The protein family can be divided into clinically relevant subfamilies. ICAM-1-binding group A PfEMP1 proteins also bind endothelial protein C receptor and have been associated with cerebral malaria in children. IgG to these PfEMP1 proteins is acquired later in life than that to group A PfEMP1 not binding ICAM-1. The kinetics of acquisition of IgG to group B and C PfEMP1 proteins binding ICAM-1 is unclear and was studied here. Gene sequences encoding group B and C PfEMP1 with DBLβ domains known to bind ICAM-1 were used to identify additional binders. Levels of IgG specific for DBLβ domains from group A, B, and C PfEMP1 binding or not binding ICAM-1 were measured in plasma from Ghanaian children with or without malaria. Seven new ICAM-1-binding DBLβ domains from group B and C PfEMP1 were identified. Healthy children had higher levels of IgG specific for ICAM-1-binding DBLβ domains from group A than from groups B and C. However, the opposite pattern was found in children with malaria, particularly among young patients. Acquisition of IgG specific for DBLβ domains binding ICAM-1 differs between PfEMP1 groups.

AB - Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) is an important malaria virulence factor. The protein family can be divided into clinically relevant subfamilies. ICAM-1-binding group A PfEMP1 proteins also bind endothelial protein C receptor and have been associated with cerebral malaria in children. IgG to these PfEMP1 proteins is acquired later in life than that to group A PfEMP1 not binding ICAM-1. The kinetics of acquisition of IgG to group B and C PfEMP1 proteins binding ICAM-1 is unclear and was studied here. Gene sequences encoding group B and C PfEMP1 with DBLβ domains known to bind ICAM-1 were used to identify additional binders. Levels of IgG specific for DBLβ domains from group A, B, and C PfEMP1 binding or not binding ICAM-1 were measured in plasma from Ghanaian children with or without malaria. Seven new ICAM-1-binding DBLβ domains from group B and C PfEMP1 were identified. Healthy children had higher levels of IgG specific for ICAM-1-binding DBLβ domains from group A than from groups B and C. However, the opposite pattern was found in children with malaria, particularly among young patients. Acquisition of IgG specific for DBLβ domains binding ICAM-1 differs between PfEMP1 groups.

U2 - 10.1128/IAI.00224-19

DO - 10.1128/IAI.00224-19

M3 - Journal article

C2 - 31308082

SN - 0019-9567

VL - 87

JO - Infection and Immunity

JF - Infection and Immunity

IS - 10

M1 - e00224-19

ER -