Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/83556
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Type: Journal article
Title: Using an improved phagocytosis assay to evaluate the effect of HIV on specific antibodies to pregnancy-associated malaria
Author: Ataide, R.
Hasang, W.
Wilson, D.
Beeson, J.
Mwapasa, V.
Molyneux, M.
Meshnick, S.
Rogerson, S.
Citation: PLoS One, 2010; 5(5):e10807-1-e10807-10
Publisher: Public Library of Science
Issue Date: 2010
ISSN: 1932-6203
1932-6203
Editor: Snounou, G.
Statement of
Responsibility: 
Ricardo Ataíde, Wina Hasang, Danny W. Wilson, James G. Beeson, Victor Mwapasa, Malcolm E. Molyneux, Steven R. Meshnick, Stephen J. Rogerson
Abstract: Background: Pregnant women residing in malaria endemic areas are highly susceptible to Plasmodium falciparum malaria, particularly during their first pregnancy, resulting in low birth weight babies and maternal anaemia. This susceptibility is associated with placental sequestration of parasitised red blood cells expressing pregnancy-specific variant surface antigens. Acquisition of antibodies against these variant surface antigens may protect women and their offspring. Functions of such antibodies may include prevention of placental sequestration or opsonisation of parasitised cells for phagocytic clearance. Methodology/Findings: Here we report the development and optimisation of a new high-throughput flow cytometry-based phagocytosis assay using undifferentiated Thp-1 cells to quantitate the amount of opsonizing antibody in patient sera, and apply this assay to measure the impact of HIV on the levels of antibodies to a pregnancy malaria-associated parasite line in a cohort of Malawian primigravid women. The assay showed high reproducibility, with inter-experimental correlation of r2 = 0.99. In primigravid women, concurrent malaria infection was associated with significantly increased antibodies, whereas HIV decreased the ability to acquire opsonising antibodies (Mann-Whitney ranksum: p = 0.013). This decrease was correlated with HIV-induced immunosuppression, with women with less than 350×106 CD4+ T- cells/L having less opsonising antibodies (coef: −11.95,P = 0.002). Levels of antibodies were not associated with protection from low birth weight or anaemia. Conclusions/Significance: This flow cytometry-based phagocytosis assay proved to be efficient and accurate for the measurement of Fc-receptor mediated phagocytosis-inducing antibodies in large cohorts. HIV was found to affect mainly the acquisition of antibodies to pregnancy-specific malaria in primigravidae. Further studies of the relationship between opsonising antibodies to malaria in pregnancy and HIV are indicated.
Keywords: Cell Line
Humans
HIV
HIV Infections
Pregnancy Complications, Parasitic
Malaria, Falciparum
Anemia
Hemoglobins
Immunoglobulin G
Antibodies, Protozoan
Antigens, Protozoan
Immunoassay
Cohort Studies
Cell Differentiation
Phagocytosis
Antibody Specificity
Pregnancy
Infant, Newborn
Infant, Low Birth Weight
Female
Rights: © 2010 Ataíde et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI: 10.1371/journal.pone.0010807
Published version: http://dx.doi.org/10.1371/journal.pone.0010807
Appears in Collections:Aurora harvest 2
Molecular and Biomedical Science publications

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