Memory CD8 + T cell compartment associated with delayed onset of Plasmodium falciparum infection and better parasite control in sickle‐cell trait children
| Autor: | Jamie L. Brady, Didier Doumtabe, Carla Proietti, Aissata Ongoiba, Karina P de Sousa, Peter D. Crompton, Kassoum Kayentao, Safiatou Doumbo, Boubacar Traore, Denise L. Doolan, Claire Loiseau |
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| Rok vydání: | 2021 |
| Předmět: |
haemoglobin AS
lcsh:Immunologic diseases. Allergy 0301 basic medicine Cellular immunity T cell Plasmodium falciparum Immunology protective immunity sickle‐cell trait phenotype 03 medical and health sciences 0302 clinical medicine Memory cell medicine Immunology and Allergy Cytotoxic T cell General Nursing Sickle cell trait biology medicine.disease biology.organism_classification 030104 developmental biology medicine.anatomical_structure Original Article lcsh:RC581-607 memory CD8+ T cells CD8 Malaria 030215 immunology |
| Zdroj: | Clinical & Translational Immunology, Vol 10, Iss 3, Pp n/a-n/a (2021) Clinical & Translational Immunology |
| ISSN: | 2050-0068 |
| DOI: | 10.1002/cti2.1265 |
| Popis: | Objectives Study of individuals with protection from Plasmodium falciparum (Pf) infection and clinical malaria, including individuals affected by the sickle‐cell trait (HbAS), offers the potential to identify cellular targets that could be translated for therapeutic development. We previously reported the first involvement of cellular immunity in HbAS‐associated relative protection and identified a novel subset of memory‐activated NK cells that was enriched in HbAS children and associated with parasite control. We hypothesised that other memory cell subsets might distinguish the baseline profile of HbAS children and children with normal haemoglobin (HbAA). Methods Subsets of memory T cells and NK cells were analysed by flow cytometry in paired samples collected from HbAS and HbAA children, at baseline and during the first malaria episode of the ensuing transmission season. Correlations between cell frequencies and features of HbAS‐mediated protection from malaria were determined. Results HbAS children displayed significantly higher frequency of memory CD8+ T cells at baseline than HbAA children. Baseline frequency of memory CD8+ T cells correlated with features of HbAS‐mediated protection from malaria. Exploration of memory CD8+ T cell subsets revealed that central memory CD8+ T cell frequency was higher in HbAS children than in HbAA children. Conclusion This study shows that HbAS children develop a larger memory CD8+ T cell compartment than HbAA children, and associates this compartment with better control of subsequent onset of infection and parasite density. Our data suggest that central memory CD8+ T cells may play an important role in the relative protection against malaria experienced by HbAS individuals, and further work to investigate this is warranted. The sickle‐cell trait is associated with protection against malaria, but the role of host immunity has been poorly explored. In this study, we show that central memory CD8+ T cells are associated with control of infection and parasite density in sickle‐cell individuals, by analyzing T cell and NK cell subsets in individuals with or without the sickle‐cell trait prior to and at the time of clinical malaria. |
| Databáze: | OpenAIRE |
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