Plasmodium falciparum exposure in utero, maternal age and parity influence the innate activation of foetal antigen presenting cells

Nadine Fievet, Stefania Varani, Samad Ibitokou, Valérie Briand, Stéphanie Louis, René Xavier Perrin, Achille Massougbogji, Anne Hosmalin, Marita Troye-Blomberg, Philippe Deloron

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28 Scopus citations

Abstract

Background: Malaria in pregnancy is associated with immunological abnormalities in the newborns, such as hampered T-helper 1 responses and increased T-regulatory responses, while the effect of maternal Plasmodium falciparum infection on foetal innate immunity is still controversial. Materials and methods: The immunophenotype and cytokine release by dendritic cells (DC) and monocytes were evaluated in cord blood from 59 Beninese women with or without malaria infection by using flow cytometry. Results: Accumulation of malaria pigment in placenta was associated with a partial maturation of cord blood myeloid and plasmacytoid DC, as reflected by an up-regulated expression of the major histocompatibility complex class II molecules, but not CD86 molecules. Cells of newborns of mothers with malaria pigment in their placenta also exhibited significantly increased cytokine responses upon TLR9 stimulation. In addition, maternal age and parity influenced the absolute numbers and activation status of cord blood antigen-presenting cells. Lastly, maternal age, but not parity, influenced TLR3, 4 and 9 responses in cord blood cells. Discussion: Our findings support the view that placental parasitization, as indicated by the presence of malaria pigment in placental leukocytes, is significantly associated with partial maturation of different DC subsets and also to slightly increased responses to TLR9 ligand in cord blood. Additionally, other factors, such as maternal age and parity should be taken into consideration when analysing foetal/neonatal innate immune responses. Conclusion: These data advocate a possible mechanism by which PAM may modulate foetal/neonatal innate immunity.

Original languageEnglish (US)
Article number251
JournalMalaria Journal
Volume8
Issue number1
DOIs
StatePublished - Dec 31 2009

ASJC Scopus subject areas

  • Parasitology
  • Infectious Diseases

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    Fievet, N., Varani, S., Ibitokou, S., Briand, V., Louis, S., Perrin, R. X., Massougbogji, A., Hosmalin, A., Troye-Blomberg, M., & Deloron, P. (2009). Plasmodium falciparum exposure in utero, maternal age and parity influence the innate activation of foetal antigen presenting cells. Malaria Journal, 8(1), [251]. https://doi.org/10.1186/1475-2875-8-251