Epitope mapping and fine specificity of human T and B cell responses for novel candidate blood-stage malaria vaccine P27A

Geiger, K. M. and Guignard, D. and Yang, C. and Bikorimana , J.-P. and Correia, B. E. and Houard, S. and Mkindi, C. and Daubenberger, C. and Spertini, F. and Corradin, G.. (2020) Epitope mapping and fine specificity of human T and B cell responses for novel candidate blood-stage malaria vaccine P27A. Frontiers in Immunology, 11. p. 412.

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P27A is a novel synthetic malaria vaccine candidate derived from the blood stage Plasmodium falciparum protein Trophozoite Exported Protein 1 (TEX1/PFF0165c). In phase 1a/1b clinical trials in malaria unexposed adults in Switzerland and in malaria pre-exposed adults in Tanzania, P27A formulated with Alhydrogel and GLA-SE adjuvants induced antigen-specific antibodies and T-cell activity. The GLA-SE adjuvant induced significantly stronger humoral responses than the Alhydrogel adjuvant. Groups of pre-exposed and unexposed subjects received identical vaccine formulations, which supported the comparison of the cellular and humoral response to P27A in terms of fine specificity and affinity for populations and adjuvants. Globally, fine specificity of the T and B cell responses exhibited preferred recognized sequences and did not highlight major differences between adjuvants or populations. Affinity of anti-P27A antibodies was around 10−8 M in all groups. Pre-exposed volunteers presented anti-P27A with higher affinity than unexposed volunteers. Increasing the dose of GLA-SE from 2.5 to 5 μg in pre-exposed volunteers improved anti-P27A affinity and decreased the number of recognized epitopes. These results indicate a higher maturation of the humoral response in pre-exposed volunteers, particularly when immunized with P27A formulated with 5 μg GLA-SE.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Medical Parasitology and Infection Biology (MPI) > Clinical Immunology (Daubenberger)
UniBasel Contributors:Mkindi, Catherine and Daubenberger, Claudia
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Frontiers Media
Note:Publication type according to Uni Basel Research Database: Journal article
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edoc DOI:
Last Modified:11 Mar 2020 08:41
Deposited On:11 Mar 2020 08:41

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