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Variable adhesion abilities and overlapping antigenic properties in placental Plasmodium falciparum isolates
Nicaise G Tuikue Ndam1, Nadine Fievet, Gwladys Bertin
1Institut de Recherche pour le Developpement (IRD), UR010, Mother and Child Health in the Tropics, Faculte de Pharmacie, Paris, France.
The Journal of Infectious Diseases
|November 6, 2004
Summary
Pregnancy-associated malaria parasites adhere to chondroitin sulfate receptors, increasing the risk of low birth weight (LBW). Immune responses vary, indicating diverse parasite adhesion phenotypes.
Area of Science:
- Immunology
- Parasitology
- Obstetrics
Background:
- Pregnancy-associated malaria involves Plasmodium falciparum selection in the placenta.
- These parasites express variant surface antigens (VSAs) that bind to chondroitin sulfate A (CSA).
Purpose of the Study:
- Investigate placental parasite adhesion to CSA and chondroitin proteoglycans (CSPGs).
- Assess maternal immune recognition and adhesion-inhibition capacity against placental isolates.
Main Methods:
- Tested adhesion of 40 placental parasite isolates to bovine CSA and human CSPGs.
- Analyzed plasma from 30 pregnant women for antibody recognition and inhibition using flow cytometry.
Main Results:
- Adhesion to CSA and CSPGs was correlated and significantly associated with increased risk of low birth weight (LBW).
- Maternal immunoglobulin G (IgG) levels against placental parasites increased with parity.
- Adhesion-inhibitory antibodies did not correlate with parasite isolates or IgG levels.
Conclusions:
- Placental parasite adhesion to chondroitin sulfate receptors is a key risk factor for LBW.
- Parasite heterogeneity suggests mixed adhesion phenotypes induce broad immune responses.