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Kinetics of antibody responses to PfRH5-complex antigens in Ghanaian children with Plasmodium falciparum malaria
- Source :
- PLoS ONE, Vol 13, Iss 6, p e0198371 (2018), Partey, F D, Castberg, F C, Sarbah, E W, Silk, S E, Awandare, G A, Draper, S J, Opoku, N, Kweku, M, Ofori, M F, Hviid, L & Barfod, L 2018, ' Kinetics of antibody responses to PfRH5-complex antigens in Ghanaian children with Plasmodium falciparum malaria ', PLOS ONE, vol. 13, no. 6, e0198371 . https://doi.org/10.1371/journal.pone.0198371
- Publication Year :
- 2018
- Publisher :
- Public Library of Science (PLoS), 2018.
-
Abstract
- Plasmodium falciparum PfRH5 protein binds Ripr, CyRPA and Pf113 to form a complex that is essential for merozoite invasion of erythrocytes. The inter-genomic conservation of the PfRH5 complex proteins makes them attractive blood stage vaccine candidates. However, little is known about how antibodies to PfRH5, CyRPA and Pf113 are acquired and maintained in naturally exposed populations, and the role of PfRH5 complex proteins in naturally acquired immunity. To provide such data, we studied 206 Ghanaian children between the ages of 1-12 years, who were symptomatic, asymptomatic or aparasitemic and healthy. Plasma levels of antigen-specific IgG and IgG subclasses were measured by ELISA at several time points during acute disease and convalescence. On the day of admission with acute P. falciparum malaria, the prevalence of antibodies to PfRH5-complex proteins was low compared to other merozoite antigens (EBA175, GLURP-R0 and GLURP-R2). At convalescence, the levels of RH5-complex-specific IgG were reduced, with the decay of PfRH5-specific IgG being slower than the decay of IgG specific for CyRPA and Pf113. No correlation between IgG levels and protection against P. falciparum malaria was observed for any of the PfRH5 complex proteins. From this we conclude that specific IgG was induced against proteins from the PfRH5-complex during acute P. falciparum malaria, but the prevalence was low and the IgG levels decayed rapidly after treatment. These data indicate that the levels of IgG specific for PfRH5-complex proteins in natural infections in Ghanaian children were markers of recent exposure only.
- Subjects :
- Male
0301 basic medicine
Protozoan Proteins
lcsh:Medicine
Antibodies, Protozoan
Antigens, Protozoan
Ghana
03 medical and health sciences
0302 clinical medicine
parasitic diseases
Humans
Malaria, Falciparum
lcsh:Science
Child
Multidisciplinary
lcsh:R
Infant
3. Good health
Kinetics
030104 developmental biology
Child, Preschool
Immunoglobulin G
Multiprotein Complexes
lcsh:Q
Female
Carrier Proteins
030215 immunology
Subjects
Details
- ISSN :
- 19326203
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- PLOS ONE
- Accession number :
- edsair.doi.dedup.....df1ea460769c2a0b8848824ca7701a7e