Immune Modulation in Pregnancy Complications

During pregnancy the maternal immune system undergoes dynamic modulation to tolerate the semi-allogeneic foetus while maintaining defence against pathogens. This immunological balance is achieved through coordinated shifts in innate and adaptive responses, involving specialised cells such as trophoblasts, regulatory T cells and uterine natural killer cells. Dysregulation of these pathways can lead to complications including pre-eclampsia, recurrent spontaneous abortion and intrauterine growth restriction. Central to these processes are key molecular mediators such as nuclear factor kappa B, cytokine networks and immunosuppressive exosomes released from the placenta. Emerging research has highlighted the importance of trophoblast invasion, arterial remodelling and placental signalling in establishing immune tolerance. Conversely, excessive inflammation, aberrant signalling in NF-κB pathways and impaired exosomal communication are implicated in pathological pregnancies. Understanding these mechanisms offers opportunities for novel diagnostics and targeted immunotherapies to improve maternal and foetal outcomes worldwide.

Research from Nature Portfolio

Recent studies have elucidated a mechanism by which exosomal regulation of NF-κB in maternal T cells is critical for healthy foetal growth. In normal gestation, exosomes bearing Fas ligand downregulate NF-κB p65 in Th1 and Th17 subsets, promoting a shift towards anti-inflammatory responses. By contrast, pregnancies complicated by intrauterine growth restriction exhibit reduced exosome number and lower Fas ligand expression, leading to persistent NF-κB activation and heightened pro-inflammatory cytokine production. These findings reveal exosome-mediated immunomodulation as a key axis in maintaining the anti-inflammatory milieu required for optimal placental development and underscore the potential of exosomal biomarkers for early detection of growth disorders.

Immune Modulation in Pregnancy Complications publication trend

The graph below shows the total number of articles in immune modulation in pregnancy complications across all publications each year (not limited to Nature Index journals).

Technical terms

Immunomodulation: The adjustment of immune responses to achieve tolerance of the foetus while maintaining host defence.

Trophoblast: Placental cells that invade the uterus, mediate nutrient exchange and modulate maternal immunity.

Nuclear factor kappa B (NF-κB): A transcription factor family that regulates inflammation and immune responses.

Regulatory T cells (Treg): A subset of CD4+ T cells that suppress aberrant immune activation and maintain tolerance.

Exosomes: Nanoscale vesicles secreted by cells, carrying proteins and nucleic acids that influence distant immune cells.

Pre-eclampsia: A hypertensive disorder of pregnancy characterised by endothelial dysfunction and systemic inflammation.

Intrauterine growth restriction (IUGR): Impaired foetal growth due to placental insufficiency and altered maternal–foetal signalling.

References

1. NF-κB regulation in maternal immunity during normal and IUGR pregnancies. Scientific Reports (2021).
2. TOP2A deficiency leads to human recurrent spontaneous abortion and growth retardation of mouse pre-implantation embryos. Molecular Medicine (2022).
3. The Role of NF-κB in Uterine Spiral Arteries Remodeling, Insight into the Cornerstone of Preeclampsia. International Journal of Molecular Sciences (2021).
4. Novel association between FOXO3 rs2232365 polymorphism and late-onset preeclampsia: a case-control candidate genetic study. BMC Pregnancy and Childbirth (2020).