Neutralization of Plasmodium falciparum Merozoites by Antibodies against PfRH5
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Neutralization of Plasmodium falciparum Merozoites by Antibodies against PfRH5. / Douglas, Alexander D; Williams, Andrew Richard; Knuepfer, Ellen; Illingworth, Joseph J; Furze, Julie M; Crosnier, Cécile; Choudhary, Prateek; Bustamante, Leyla Y; Zakutansky, Sara E; Awuah, Dennis K; Alanine, Daniel G W; Theron, Michel; Worth, Andrew; Shimkets, Richard; Rayner, Julian C; Holder, Anthony A; Wright, Gavin J; Draper, Simon J.
In: Journal of Immunology, Vol. 192, No. 1, 01.01.2014, p. 245-258.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Neutralization of Plasmodium falciparum Merozoites by Antibodies against PfRH5
AU - Douglas, Alexander D
AU - Williams, Andrew Richard
AU - Knuepfer, Ellen
AU - Illingworth, Joseph J
AU - Furze, Julie M
AU - Crosnier, Cécile
AU - Choudhary, Prateek
AU - Bustamante, Leyla Y
AU - Zakutansky, Sara E
AU - Awuah, Dennis K
AU - Alanine, Daniel G W
AU - Theron, Michel
AU - Worth, Andrew
AU - Shimkets, Richard
AU - Rayner, Julian C
AU - Holder, Anthony A
AU - Wright, Gavin J
AU - Draper, Simon J
PY - 2014/1/1
Y1 - 2014/1/1
N2 - There is intense interest in induction and characterization of strain-transcending neutralizing Ab against antigenically variable human pathogens. We have recently identified the human malaria parasite Plasmodium falciparum reticulocyte-binding protein homolog 5 (PfRH5) as a target of broadly neutralizing Abs, but there is little information regarding the functional mechanism(s) of Ab-mediated neutralization. In this study, we report that vaccine-induced polyclonal anti-PfRH5 Abs inhibit the tight attachment of merozoites to erythrocytes and are capable of blocking the interaction of PfRH5 with its receptor basigin. Furthermore, by developing anti-PfRH5 mAbs, we provide evidence of the following: 1) the ability to block the PfRH5-basigin interaction in vitro is predictive of functional activity, but absence of blockade does not predict absence of functional activity; 2) neutralizing mAbs bind spatially related epitopes on the folded protein, involving at least two defined regions of the PfRH5 primary sequence; 3) a brief exposure window of PfRH5 is likely to necessitate rapid binding of Ab to neutralize parasites; and 4) intact bivalent IgG contributes to but is not necessary for parasite neutralization. These data provide important insight into the mechanisms of broadly neutralizing anti-malaria Abs and further encourage anti-PfRH5-based malaria prevention efforts.
AB - There is intense interest in induction and characterization of strain-transcending neutralizing Ab against antigenically variable human pathogens. We have recently identified the human malaria parasite Plasmodium falciparum reticulocyte-binding protein homolog 5 (PfRH5) as a target of broadly neutralizing Abs, but there is little information regarding the functional mechanism(s) of Ab-mediated neutralization. In this study, we report that vaccine-induced polyclonal anti-PfRH5 Abs inhibit the tight attachment of merozoites to erythrocytes and are capable of blocking the interaction of PfRH5 with its receptor basigin. Furthermore, by developing anti-PfRH5 mAbs, we provide evidence of the following: 1) the ability to block the PfRH5-basigin interaction in vitro is predictive of functional activity, but absence of blockade does not predict absence of functional activity; 2) neutralizing mAbs bind spatially related epitopes on the folded protein, involving at least two defined regions of the PfRH5 primary sequence; 3) a brief exposure window of PfRH5 is likely to necessitate rapid binding of Ab to neutralize parasites; and 4) intact bivalent IgG contributes to but is not necessary for parasite neutralization. These data provide important insight into the mechanisms of broadly neutralizing anti-malaria Abs and further encourage anti-PfRH5-based malaria prevention efforts.
U2 - 10.4049/jimmunol.1302045
DO - 10.4049/jimmunol.1302045
M3 - Journal article
C2 - 24293631
VL - 192
SP - 245
EP - 258
JO - Journal of Immunology
JF - Journal of Immunology
SN - 0022-1767
IS - 1
ER -
ID: 87138168