Characterization of anti-var2CSA-PfEMP1 cytoadhesion inhibitory mouse monoclonal antibodies.
Microbes Infect
; 8(14-15): 2863-71, 2006.
Article
in En
| MEDLINE
| ID: mdl-17095277
ABSTRACT
Pregnancy-associated malaria (PAM) is associated with the massive sequestration of erythrocytes infected with CSA-binding parasites in the placenta. Natural protective immunity against PAM is acquired during the course of pregnancies, with the development of anti-PfEMP1 antibodies recognizing placental infected erythrocytes (IEs) from different geographical regions. Mouse monoclonal antibodies (mabs) were raised against Plasmodium falciparum variant surface proteins expressed by CSA-binding parasites. These mabs blocked 0-60% of CSA-binding parasite adhesion and immunoprecipitated a 350 kDa 125I-labeled PfEMP1(CSA). Two var2CSA domains expressed on the surface of CHO cells (DBL5epsilon and DBL6epsilon) were identified as the targets of three of four antibodies inhibiting CSA binding. Two of these antibodies also recognized either DBL2x or DBL3x, suggesting that some epitopes may be common to several var2CSA domains. These mabs also specifically selected CSA-binding IEs and facilitated the purification from IE extracts of the native var2CSA ligand. This purified ligand elicited antibodies in immunized mice inhibiting efficiently IE(CSA) cytoadhesion. Based on our findings, we provide the first demonstration that the parasite var2CSA surface protein can elicit inhibitory antibodies and define here the subunits of the var2CSA ligand suitable for use in vaccine development.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Antibodies, Protozoan
/
Antibodies, Monoclonal
/
Antigens, Protozoan
Type of study:
Prognostic_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
Microbes Infect
Journal subject:
ALERGIA E IMUNOLOGIA
/
MICROBIOLOGIA
Year:
2006
Document type:
Article
Affiliation country: