Naturally occurring plasmodium-specific IgA antibody in humans from a malaria endemic area |
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Authors: | Sukla Biswas Queen B Saxena Arati Roy Lalitha Kabilan |
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Institution: | (1) Malaria Research Centre, 22 Sham Nath Marg, 110 054 Delhi, India |
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Abstract: | Blood samples collected from individuals belonging to an endemic area in Uttar Pradesh, were tested for plasmodial antigen
specific immunoglobulin A (IgA) by enzyme immuno assay using soluble extract ofPlasmodium falciparum from culture. Among 773 (20.18%,P < 0.0001) samples 156 sera demonstrated a detectable seropositivity for antigen specific IgA. IgA levels were higher among
individuals who experienced repeated attacks of malaria compared to acute infected patients. Among seropositive individuals
the IgA titers were found increased with the age. Immunoglobulin isolated from sera having high level of IgA showed growth
inhibitory effect inPlasmodium falciparum in vitro. A group of sera with high IgA antibody againstPlasmodium falciparum crude antigen showed seronegativity with specific peptides. Statistically, no positive or negative correlations were observed
between antigen specific IgG and IgA. However, there was a tendency towards negative correlation between IgA and IgM. Mechanisms
for the parasite specific IgA production remain to be established. |
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Keywords: | Malaria IgA enzyme immuno-assay Plasmodium falciparum peptide antigens |
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