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Plasmodium coatneyi ring-infected erythrocyte surface antigens
R Udomsangpetch1, A E Brown, C D Smith
1Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand.
Summary
The Plasmodium coatneyi parasite produces a ring-infected erythrocyte surface antigen (RESA) in rhesus monkeys. This RESA elicits an immune response, supporting its use in developing malaria vaccines.
Area of Science:
- Immunology
- Parasitology
- Vaccinology
Background:
- Plasmodium parasites cause malaria, a significant global health concern.
- The ring-infected erythrocyte surface antigen (RESA) is a key target for malaria vaccine development.
- Understanding immune responses to Plasmodium antigens in animal models is crucial for vaccine efficacy studies.
Purpose of the Study:
- To investigate the immunogenicity and characteristics of Plasmodium coatneyi RESA.
- To evaluate the cross-reactivity of antibodies between P. coatneyi and Plasmodium falciparum RESA.
- To assess the potential of the rhesus monkey model for RESA-based malaria vaccine development.
Main Methods:
- Infection of rhesus monkeys with Plasmodium coatneyi.
- Immunofluorescence assay and Western blot analysis to detect antigen-antibody interactions.
- Erythrocyte membrane immunofluorescence assay and dot immunoblot analysis to assess cross-reactivity.
Main Results:
- Plasmodium coatneyi produces a RESA-like antigen that is immunogenic in rhesus monkeys.
- Antibody responses to P. coatneyi RESA were boosted by repeated infections, similar to P. falciparum in humans.
- Antibodies to P. coatneyi RESA showed cross-reactivity with P. falciparum antigens, but not vice versa, suggesting distinct epitopes.
Conclusions:
- Plasmodium coatneyi expresses a RESA-like antigen with similar immunogenic properties to P. falciparum RESA.
- Distinct immunogenic epitopes exist between P. coatneyi and P. falciparum RESA.
- The rhesus monkey model is suitable for studying RESA-based malaria vaccine candidates.