Identification and Characterization of Functional Human Monoclonal Antibodies to Plasmodium vivax Duffy-Binding Protein
| Autor: | Seila Suon, Samantha J. Barnes, Rick M. Fairhurst, Marcelo U. Ferreira, Sebastien Dechavanne, John H. Adams, Vanessa C. Nicolete, Camille Roesch, Célia Dechavanne, Jean Popovici, Christopher L. King, Niraj H. Tolia, Edwin Chen, Lenore L. Carias, Benoit Witkowski, Chanaki Amaratunga, Sokunthea Sreng |
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| Přispěvatelé: | Mère et enfant en milieu tropical : pathogènes, système de santé et transition épidémiologique (MERIT - UMR_D 216), Institut de Recherche pour le Développement (IRD)-Université de Paris (UP) |
| Rok vydání: | 2019 |
| Předmět: |
medicine.drug_class
Binding protein Immunology Plasmodium vivax Biology biology.organism_classification Monoclonal antibody Virology Epitope 3. Good health 03 medical and health sciences [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology 0302 clinical medicine medicine.anatomical_structure Antigen Reticulocyte parasitic diseases medicine biology.protein Immunology and Allergy Antibody Memory B cell 030215 immunology |
| Zdroj: | Journal of Immunology Journal of Immunology, Publisher : Baltimore : Williams & Wilkins, c1950-. Latest Publisher : Bethesda, MD : American Association of Immunologists, 2019, 202 (9), p. 2648-2660. ⟨10.4049/jimmunol.1801631⟩ |
| ISSN: | 1550-6606 0022-1767 |
| Popis: | Plasmodium vivax invasion of reticulocytes relies on distinct receptor-ligand interactions between the parasite and host erythrocytes. Engagement of the highly polymorphic domain II of the P. vivax Duffy-binding protein (DBPII) with the erythrocyte’s Duffy Ag receptor for chemokines (DARC) is essential. Some P. vivax–exposed individuals acquired Abs to DBPII that block DBPII-DARC interaction and inhibit P. vivax reticulocyte invasion, and Ab levels correlate with protection against P. vivax malaria. To better understand the functional characteristics and fine specificity of protective human Abs to DBPII, we sorted single DBPII-specific IgG+ memory B cells from three individuals with high blocking activity to DBPII. We identified 12 DBPII-specific human mAbs from distinct lineages that blocked DBPII-DARC binding. All mAbs were P. vivax strain transcending and targeted known binding motifs of DBPII with DARC. Eleven mAbs competed with each other for binding, indicating recognition of the same or overlapping epitopes. Naturally acquired blocking Abs to DBPII from individuals with high levels residing in different P. vivax–endemic areas worldwide competed with mAbs, suggesting broadly shared recognition sites. We also found that mAbs inhibited P. vivax entry into reticulocytes in vitro. These findings suggest that IgG+ memory B cell activity in individuals with P. vivax strain–transcending Abs to DBPII display a limited clonal response with inhibitory blocking directed against a distinct region of the molecule. |
| Databáze: | OpenAIRE |
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