Publications Scientifiques

[ Article ] The humoral response to Plasmodium falciparum VarO rosetting variant and its association with protection against malaria in Beninese children.

Date de soumission: 07-02-2018
Année de Publication: 2010
Entité/Laboratoire Laboratoire de Recherche en Biologie Appliquée (LARBA)
Document type : Article
Discipline(s) : Immulogie & maladie infectueuse
Titre The humoral response to Plasmodium falciparum VarO rosetting variant and its association with protection against malaria in Beninese children.
Auteurs Vigan-Womas Inès [1], Lokossou Adjimon Gatien [2], Guillotte Micheline [3], Juillerat Alexandre [4], Bentley Graham [5], Garcia André [6], Mercereau-Puijalon Odile [7], Migot-Nabias Florence [8],
Journal: Malaria Journal (
Catégorie Journal: Internationale
Impact factor: 3.079
Volume Journal: 9
DOI: 10.1186/1475-2875-9-267
Resume BACKGROUND: The capacity of Plasmodium falciparum-infected erythrocytes to bind uninfected erythrocytes (rosetting) is associated with severe malaria in African children. Rosetting is mediated by a subset of the variant surface antigens PfEMP1 targeted by protective antibody responses. Analysis of the response to rosette-forming parasites and their PfEMP1 adhesive domains is essential for understanding the acquisition of protection against severe malaria. To this end, the antibody response to a rosetting variant was analysed in children recruited with severe or uncomplicated malaria or asymptomatic P. falciparum infection. METHODS: Serum was collected from Beninese children with severe malaria, uncomplicated malaria or P. falciparum asymptomatic infection (N = 65, 37 and 52, respectively) and from immune adults (N = 30) living in the area. Infected erythrocyte surface-reactive IgG, rosette disrupting antibodies and IgG to the parasite crude extract were analysed using the single variant Palo Alto VarO-infected line. IgG, IgG1 and IgG3 to PfEMP1-varO-derived NTS-DBL1α1, CIDRγ and DBL2βC2 recombinant domains were analysed by ELISA. Antibody responses were compared in the clinical groups. Stability of the response was studied using a blood sampling collected 14 months later from asymptomatic children. RESULTS: Seroprevalence of erythrocyte surface-reactive IgG was high in adults (100%) and asymptomatic children (92.3%) but low in children with severe or uncomplicated malaria (26.1% and 37.8%, respectively). The IgG, IgG1 and IgG3 antibody responses to the varO-derived PfEMP1 domains were significantly higher in asymptomatic children than in children with clinical malaria in a multivariate analysis correcting for age and parasite density at enrolment. They were essentially stable, although levels tended to decrease with time. VarO-surface reactivity correlated positively with IgG reactivity to the rosetting domain varO-NTS-DBL1α1. None of the children sera, including those with surface-reactive antibodies possessed anti-VarO-rosetting activity, and few adults had rosette-disrupting antibodies. CONCLUSIONS: Children with severe and uncomplicated malaria had similar responses. The higher prevalence and level of VarO-reactive antibodies in asymptomatic children compared to children with malaria is consistent with a protective role for anti-VarO antibodies against clinical falciparum malaria. The mechanism of such protection seems independent of rosette-disruption, suggesting that the cytophilic properties of antibodies come into play.
Mots clés Plasmodium falciparum VarO rosetting, immune response, Beninese children
Pages 1 - 8
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