Immunological Modulation of Pregnancy Outcomes
Summary
The success of pregnancy depends on a finely tuned interplay between the maternal immune system and the semi-allogeneic foetus. Immunological modulation encompasses both the natural mechanisms that establish and maintain maternal–fetal tolerance and the therapeutic strategies designed to correct immune dysregulation. Key processes include the shift from pro-inflammatory Th1 responses towards anti-inflammatory Th2 and regulatory T-cell activity, the role of decidual natural killer cells in vascular remodelling, and the polarisation of macrophages within the placental bed. Aberrant immune activation underlies conditions such as recurrent miscarriage, pre-eclampsia, foetal growth restriction and preterm birth. Recent advances have elucidated molecular pathways—such as FASN-CEACAM1 signalling, STAT-mediated cytokine networks and immune cell crosstalk—that govern placental development and tolerance. These insights are informing personalised immunomodulatory approaches, including targeted use of calcineurin inhibitors, cytokine modulation and biomarker-driven therapy, with the ultimate aim of reducing perinatal morbidity and mortality across diverse populations.
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Immunological Modulation of Pregnancy Outcomes publication trend
The graph below shows the total number of articles in immunological modulation of pregnancy outcomes across all publications each year (not limited to Nature Index journals).
Technical terms
Maternal–fetal tolerance: The immunological state that prevents maternal rejection of the semi-allogeneic foetus by favouring anti-inflammatory cell and cytokine profiles.
Calcineurin inhibitors: A class of immunosuppressive drugs, including tacrolimus and cyclosporin A, that inhibit the phosphatase calcineurin to reduce T-cell activation.
Extravillous trophoblast: Placental cells that invade the maternal decidua to remodel spiral arteries and establish the uteroplacental circulation.
Th1/Th2 balance: The relative predominance of T-helper type 1 cytokines (pro-inflammatory) versus T-helper type 2 cytokines (anti-inflammatory) that influences immune tolerance in pregnancy.
Macrophage polarisation: The process by which macrophages adopt either a pro-inflammatory (M1) phenotype or an anti-inflammatory (M2) phenotype in response to local cytokine cues.
FASN-CEACAM1 pathway: A signalling axis involving fatty acid synthase and a cell adhesion molecule that regulates trophoblast function and immune interactions at the maternal–fetal interface.
References
- Tacrolimus (FK506) promotes placentation and maternal-fetal tolerance through modulating FASN-CEACAM1 pathway. Frontiers in Immunology (2025).
- Cyclophilin A as a Pro-Inflammatory Factor Exhibits Embryotoxic and Teratogenic Effects during Fetal Organogenesis. International Journal of Molecular Sciences (2023).
- Multicenter, 2-dose single-group controlled trial of tacrolimus for the severe infertility patients. Medicine (2023).
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