Publications des scientifiques de l'IRD

Doritchamou J., Bigey P., Nielsen M. A., Gnidehou S., Ezinmegnon S., Burgain A., Massougbodji A., Deloron Philippe, Salanti A., Tuikue Ndam Nicaise. (2013). Differential adhesion-inhibitory patterns of antibodies raised against two major variants of the NTS-DBL2X region of VAR2CSA. Vaccine, 31 (41), p. 4516-4522. ISSN 0264-410X.

Titre du document
Differential adhesion-inhibitory patterns of antibodies raised against two major variants of the NTS-DBL2X region of VAR2CSA
Année de publication
2013
Type de document
Article référencé dans le Web of Science WOS:000326008300008
Auteurs
Doritchamou J., Bigey P., Nielsen M. A., Gnidehou S., Ezinmegnon S., Burgain A., Massougbodji A., Deloron Philippe, Salanti A., Tuikue Ndam Nicaise
Source
Vaccine, 2013, 31 (41), p. 4516-4522 ISSN 0264-410X
Background: VAR2CSA is a large polymorphic Plasmodium falciparum protein expressed on infected erythrocytes (IE) that allows their binding in the placenta, thus precipitating placental malaria (PM). The N-terminal part of VAR2CSA that contains the binding site to placental chondroitin sulfate A (CSA) is currently recognized as the most attractive region for vaccine development. An ultimate challenge is to define epitopes in this region that induce a broad cross-reactive adhesion inhibitory antibody response. Methods: Based on phylogenetic data that identified a dimorphic sequence motif in the VAR2CSA DBL2X, we raised antibodies against the NTS-DBL2X constructs containing one sequence or the other (3D7 and FCR3) and tested their functional properties on P. falciparum isolates from pregnant women and on laboratory-adapted strains. Results: The CSA binding inhibitory capacity of the antibodies induced varied from one parasite isolate to another (range, 10%-100%), but the combined analysis of individual activity highlighted a broader functionality that increased the total number of isolates inhibited. Interestingly, the differential inhibitory effect of the antibodies observed on field isolates resulted in significant inhibition of all field isolates tested, suggesting that optimal inhibitory spectrum on field isolates from pregnant women might be achieved with antibodies targeting limited variants of the N-terminal VAR2CSA. Conclusions: Our findings indicate that the NTS-DBL2X region of VAR2CSA can elicit strain-transcending anti-adhesion antibodies and suggest that the combination of the two major variants used here could represent the basis for an effective bivalent VAR2CSA-based vaccine.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Santé : généralités [050] ; Entomologie médicale / Parasitologie / Virologie [052]
Localisation
Fonds IRD [F B010061224]
Identifiant IRD
fdi:010061224
Contact