Maternal-Fetal Immune Interaction Dynamics
Summary
The period of pregnancy represents a finely balanced immunological challenge in which the mother’s immune system must tolerate a genetically distinct fetus while preserving the capacity to resist infection. At the maternal–fetal interface, specialised fetal cells known as trophoblasts invade the decidua and interact with a diverse repertoire of maternal immune cells, including decidual natural killer cells, macrophages, dendritic cells and T lymphocytes. This cross-talk involves both cell-bound and soluble mediators. Non-classical human leucocyte antigens, notably HLA-G, play a central role in dampening cytotoxic responses and promoting regulatory cell subsets. Simultaneously, trophoblast-derived extracellular vesicles deliver immune-modulatory proteins and nucleic acids into the maternal circulation, influencing systemic tolerance. Aberrant immune interactions are implicated in disorders such as preeclampsia, recurrent pregnancy loss and preterm birth. Contemporary research explores the molecular pathways governing antigen presentation, cytokine networks at the decidua, and the dual need for protective immunity against pathogens. Insights into spiral artery remodelling, mediated by interactions between extravillous trophoblasts and natural killer cells, have illuminated mechanisms that ensure adequate placental perfusion. Advances in understanding maternal-fetal immunology hold promise for diagnostics and therapeutic strategies aimed at restoring immune balance in pregnancy complications.
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Maternal-Fetal Immune Interaction Dynamics publication trend
The graph below shows the total number of articles in maternal-fetal immune interaction dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
HLA-G: A non-classical MHC class I molecule expressed by extravillous trophoblasts that binds inhibitory receptors on maternal immune cells to promote tolerance.
Decidual natural killer (dNK) cells: A specialised population of uterine NK cells that interact with trophoblast HLA molecules to regulate vascular remodelling and local immunity.
Extracellular vesicles (EVs): Nano- to micro-scale particles released by cells, carrying proteins and RNAs that modulate distant immune responses.
Eplets: Short amino-acid sequences on HLA molecules that define functional antigenic compatibility between mother and fetus.
Spiral artery remodelling: The process by which fetal trophoblasts transform uterine arteries into low-resistance vessels, ensuring sufficient placental blood flow.
References
- High maternal-fetal HLA eplet compatibility is associated with severe manifestation of preeclampsia. Frontiers in Immunology (2023).
- Association between Plasma HLA-DR+ Placental Vesicles and Preeclampsia: A Pilot Longitudinal Cohort Study. Cells (2024).
- HLA-G and Recurrent Pregnancy Loss. International Journal of Molecular Sciences (2023).
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