Updates of placental macrophages: Origins, molecular markers, functions, and related diseases

Huixia Yang1, Anca Chelariu-Raicu1, Dimitra Makri1

  • 1Department of Obstetrics and Gynaecology, University Hospital, Ludwig Maximilian University, Munich, Germany.

Placental macrophages are highly heterogeneous cells with differential phenotypes and functions defined by differential origins and modulated by the changing placental environment. During pregnancy, placental macrophages play a critical role in embryo implantation, placenta formation and homeostasis, fetal development and parturition. This review summarizes recent findings on the cellular origin of placental macrophages, and provide a comprehensive description of their phenotypes, corresponding molecular markers and functions in human placenta. Finally, alterations of placental macrophages in pregnancy-related diseases are discussed.

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