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Antibodies to sequences in a non-repeat region of Plasmodium falciparum antigen Pf155/RESA inhibit either cytoadherence or parasite growth in vitro

Published online by Cambridge University Press:  01 September 1998

A. B. SIDDIQUE ,
N. AHLBORG ,
B. WÅHLIN FLYG ,
P. PERLMANN  and
K. BERZINS
A. B. SIDDIQUE
Affiliation:
Department of Immunology, Stockholm University, S-106 91 Stockholm, Sweden
N. AHLBORG
Affiliation:
Department of Immunology, Stockholm University, S-106 91 Stockholm, Sweden Institute of Cell, Animal and Population Biology, University of Edinburgh, Edinburgh EH9 3JT, UK
B. WÅHLIN FLYG
Affiliation:
Department of Immunology, Stockholm University, S-106 91 Stockholm, Sweden
P. PERLMANN
Affiliation:
Department of Immunology, Stockholm University, S-106 91 Stockholm, Sweden
K. BERZINS
Affiliation:
Department of Immunology, Stockholm University, S-106 91 Stockholm, Sweden
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Abstract

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Antibodies to a non-repeat region of the Plasmodium falciparum antigen Pf155/RESA were investigated for their capacity to inhibit parasite cytoadherence to melanoma cells and parasite growth in vitro. The activities of these antibodies were studied since the target region in Pf155/RESA includes a cytoadherence-related motif also found in loop 3 and 7 of human erythrocyte band 3 protein. Overlapping multiple antigen peptides (MAPs) together spanning residues 199–220 of Pf155/RESA were used to raise antibodies in rabbits. Analysis of the fine specificity of these antibodies revealed that antibodies raised against largely overlapping sequences displayed highly different specificity patterns. Similarly, striking differences were seen when analysing the biological effect of antibodies to these MAPs. Antibodies to the cytoadherence-related motif of Pf155/RESA, as well as antibodies raised against a MAP based on a corresponding band 3 motif, inhibited cytoadherence but not parasite growth. In contrast, antibodies to sequences adjacent to the Pf155/RESA cytoadherence motif inhibited parasite growth in vitro but had no effect on cytoadherence.

Keywords

Plasmodium falciparumPf155/RESARBC band 3cytoadherence
Type
Research Article
Information
Parasitology , Volume 117 , Issue 3 , September 1998 , pp. 209 - 216
Copyright
1998 Cambridge University Press