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Neutrophils and Pregnancy-Associated Malaria

Author(s): Moussa Djimde, Kassoum Kayentao, Charles Arama, Alassane Dicko, Petra F. Mens and Henk H.D.F. Schallig

Purpose: Pregnant women living in areas with transmission of Plasmodium falciparum are exposed to malaria and its harmful consequences on pregnancy outcomes. Neutrophils are the most abundant white blood cells (WBC) in the bloodstream and are innate immune key effectors against infections. Substantial work has been done to study the role of neutrophils in malaria, but little on pregnancy-associated malaria (PAM). This review focuses on neutrophil responses to malaria during pregnancy that may help us to understand their dynamics and effects on pregnancy outcomes.

Source: A literature review covering the topic of PAM and neutrophils were accessed via PubMedâ and Embaseâ databases. In total, 20 unique publications were found in PubMed while 99 in Embaseâ. After excluding 114 irrelevant titles and abstracts, 5 original articles full texts were assessed and included in this review.

Results: Due to oestrogen stimulation, the number of neutrophils is higher in pregnant women compared to non-pregnant women. This increase in neutrophil numbers reaches a plateau in the second and third trimesters of pregnancy. However, the number of circulating neutrophils in peripheral blood is lower in pregnant women with Plasmodium falciparum malaria than in pregnant women without malaria. The decrease in circulating neutrophils in the context of PAM may reflect the accumulation of neutrophils in the infected placenta. Data showed that the prevalence of children with low birth weight (LBW) was higher in pregnant women with high number of pigmented peripheral neutrophils compared to malaria-infected pregnant women with low number of pigmented peripheral neutrophils.

Conclusions: This review aids our understanding of the dynamics of neutrophils during a malaria infection in in pregnant women by providing scientific evidence that suggests that neutrophil levels decrease in pregnant women with malaria infection. A negative association between the number of pigmented neutrophils in women with malaria and the birth weight of children points towards prioritizing future research in pregnant women with malaria on these cells involved in the first line of innate immunity.

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Impact Factor: * 3.1

CiteScore: 2.9

Acceptance Rate: 11.01%

Time to first decision: 10.4 days

Time from article received to acceptance: 2-3 weeks

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    Editor In Chief

    Masashi Emoto

  • Professor of Laboratory of Immunology
    Department of Laboratory Sciences
    Gunma University Graduate School of Health Sciences
    Gunma, Japan

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