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Long-term Maintenance of CD4 T Cell Memory Responses to Malaria Antigens in Malian Children Coinfected with Schistosoma haematobium.
Lyke, Kirsten E; Dabo, Abdoulaye; Arama, Charles; Diarra, Issa; Plowe, Christopher V; Doumbo, Ogobara K; Sztein, Marcelo B.
Afiliación
  • Lyke KE; Center for Vaccine Development, Institute for Global Health, School of Medicine, University of Maryland, Baltimore, MD, United States.
  • Dabo A; Division of Malaria Research, Institute for Global Health, School of Medicine, University of Maryland, Baltimore, MD, United States.
  • Arama C; Malaria Research and Training Center, International Centers for Excellence in Research (NIH), University of Science Techniques and Technologies of Bamako, Bamako, Mali.
  • Diarra I; Malaria Research and Training Center, International Centers for Excellence in Research (NIH), University of Science Techniques and Technologies of Bamako, Bamako, Mali.
  • Plowe CV; Malaria Research and Training Center, International Centers for Excellence in Research (NIH), University of Science Techniques and Technologies of Bamako, Bamako, Mali.
  • Doumbo OK; Center for Vaccine Development, Institute for Global Health, School of Medicine, University of Maryland, Baltimore, MD, United States.
  • Sztein MB; Division of Malaria Research, Institute for Global Health, School of Medicine, University of Maryland, Baltimore, MD, United States.
Front Immunol ; 8: 1995, 2017.
Article en En | MEDLINE | ID: mdl-29449839
Polyparasitism is common in the developing world. We have previously demonstrated that schistosomiasis-positive (SP) Malian children, aged 4-8 years, are protected from malaria compared to matched schistosomiasis-negative (SN) children. The effect of concomitant schistosomiasis upon acquisition of T cell memory is unknown. We examined antigen-specific T cell frequencies in 48 Malian children aged 4-14 to a pool of malaria blood stage antigens, and a pool of schistosomal antigens, at a time point during a malaria episode and at a convalescent time point ~6 months later, following cessation of malaria transmission. CD4+ T cell-derived memory responses, defined as one or more significant cytokine (IFN-γ, TNF-α, IL-2, and/or IL-17A) responses, was measured to schistoma antigens in 18/23 SP children at one or both time points, compared to 4/23 SN children (P < 0.0001). At the time of malaria infection, 12/24 SN children and 15/23 SP children (P = 0.29) stimulated with malaria antigens demonstrated memory recall as defined by CD4-derived cytokine production. This compares to 7/23 SN children and 16/23 SP children (P = 0.009) at the convalescent timepoint. 46.2% of cytokine-producing CD4+ T cells expressed a single cytokine after stimulation with malaria antigen during the malaria episode. This fell to 40.9% at follow-up with a compensatory rise of multifunctional cytokine secretion over time, a phenomenon consistent with memory maturation. The majority (53.2-59.5%) of responses derived from CD45RA-CD62L- effector memory T cells with little variation in the phenotype depending upon the time point or the study cohort. We conclude that detectable T cell memory responses can be measured against both malaria and schistosoma antigens and that the presence of Schistosoma haematobium may be associated with long-term maintenance of T memory to malaria.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Front Immunol Año: 2017 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Suiza

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Front Immunol Año: 2017 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Suiza