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Thrombospondin related adhesive protein (TRAP), a potential malaria vaccine candidate
1Départment d'Epidémiologie des Affections Parasitaires, Ecole Nationale de Médecine, de Pharmacie et d'Odonto-Stomatologie, Bamako, Mali.
Insights
Naturally induced immunity to Plasmodium falciparum thrombospondin-related adhesive protein (PfTRAP) offers protection against severe malaria. Higher PfTRAP antibody levels in children correlated with reduced risk of cerebral malaria.
Area of Science:
- Immunology
- Infectious Diseases
- Malariology
Background:
- Malaria remains a significant global health challenge, particularly in endemic regions.
- Plasmodium falciparum thrombospondin-related adhesive protein (PfTRAP) is a key target for malaria immunity.
- Understanding naturally acquired immunity is crucial for vaccine development.
Purpose of the Study:
- To investigate the role of naturally induced immunity to PfTRAP in protection against malaria.
- To determine the association between PfTRAP seroprevalence and the risk of cerebral malaria in West African children.
Main Methods:
- A case-control study was conducted in children from a malaria-endemic area.
- Enzyme-linked immunosorbent assay (ELISA) was used to measure serum reactivity against PfTRAP, circumsporozoite protein, and merozoite surface protein 1.
- Comparison of PfTRAP seroprevalence between children with uncomplicated malaria and cerebral malaria.
Main Results:
- Children with uncomplicated malaria exhibited significantly higher PfTRAP seroprevalence compared to those with cerebral malaria.
- The risk of cerebral malaria was inversely related to sporozoite inoculation rates and humoral immunity against PfTRAP.
- Naturally induced humoral immunity against PfTRAP appears to contribute to protection against severe malaria.
Conclusions:
- Naturally acquired humoral immunity to PfTRAP plays a role in protecting against severe malaria.
- PfTRAP is a promising target for enhancing the efficacy of malaria vaccines.
- Further research into PfTRAP-based vaccines is warranted.
Abstract:
We have investigated whether naturally induced immunity to Plasmodium falciparum thrombospondin related adhesive protein contributes to protection against malaria in humans. We have carried out a case control study in children living in an endemic region of West Africa to reveal associations between PfTRAP seroprevalence and the risk of cerebral malaria. Sera collected from the case and control groups were analysed by ELISA to compare their serum reactivity against PfTRAP, the circumsporozoite protein and the merozoite surface protein 1. Children with uncomplicated malaria had a significantly higher PfTRAP seroprevalence when compared to children with cerebral malaria. The risk of developing cerebral malaria appeared to depend on the reciprocal relationship between sporozoite inoculation rates and humoral immunity against PfTRAP. Our results suggest that naturally induced humoral immunity against PfTRAP contributes to the development of protection against severe malaria. Experimentally induced immunity against TRAP in different rodent models has consistently proven to elicit a high degree of protection against malaria. This together with the functional properties of TRAP and data describing CD4 and CD8 epitopes for PfTRAP indicate that this molecule could increase the protective efficiency of available sporozoite malaria vaccines.