Maternal Microchimerism Predicts Increased Infection but Decreased Disease due to Plasmodium falciparum During Early Childhood
WE Harrington, SB Kanaan… - The Journal of …, 2017 - academic.oup.com
The Journal of infectious diseases, 2017•academic.oup.com
Background A mother's infection with placental malaria (PM) can affect her child's
susceptibility to malaria, although the mechanism remains unclear. The fetus acquires a
small amount of maternal cells and DNA known as maternal microchimerism (MMc), and we
hypothesized that PM increases MMc and that MMc alters risk of Plasmodium falciparum
malaria during infancy. Methods In a nested cohort from Muheza, Tanzania, we evaluated
the presence and level of cord blood MMc in offspring of women with and without PM. A …
susceptibility to malaria, although the mechanism remains unclear. The fetus acquires a
small amount of maternal cells and DNA known as maternal microchimerism (MMc), and we
hypothesized that PM increases MMc and that MMc alters risk of Plasmodium falciparum
malaria during infancy. Methods In a nested cohort from Muheza, Tanzania, we evaluated
the presence and level of cord blood MMc in offspring of women with and without PM. A …
Background
A mother’s infection with placental malaria (PM) can affect her child’s susceptibility to malaria, although the mechanism remains unclear. The fetus acquires a small amount of maternal cells and DNA known as maternal microchimerism (MMc), and we hypothesized that PM increases MMc and that MMc alters risk of Plasmodium falciparum malaria during infancy.
Methods
In a nested cohort from Muheza, Tanzania, we evaluated the presence and level of cord blood MMc in offspring of women with and without PM. A maternal-specific polymorphism was identified for each maternal–infant pair, and MMc was assayed by quantitative polymerase chain reaction. The ability of MMc to predict malaria outcomes during early childhood was evaluated in longitudinal models.
Results
Inflammatory PM increased the detection rate of MMc among offspring of primigravidae and secundigravidae, and both noninflammatory and inflammatory PM increased the level of MMc. Detectable MMc predicted increased risk of positive blood smear but, interestingly, decreased risk of symptomatic malaria and malaria hospitalization.
Conclusions
The acquisition of MMc may result in increased malaria infection but protection from malaria disease. Future studies should be directed at the cellular component of MMc, with attention to its ability to directly or indirectly coordinate anti-malarial immune responses in the offspring.
Oxford University Press