Immunological Mechanisms in Recurrent Pregnancy Loss
Summary
Recurrent pregnancy loss is increasingly recognised as a disorder in which dysregulation of the maternal immune system at the maternal–fetal interface undermines embryo implantation and placental development. A finely tuned network of immune cells—including uterine natural killer cells, specialised T lymphocyte subsets and antigen-presenting cells—normally establishes a state of local tolerance towards the semi-allogeneic embryo. Central to this process is the shift from a pro-inflammatory milieu that facilitates trophoblast invasion to an anti-inflammatory environment that supports placental growth. Regulatory T cells and anti-inflammatory cytokines maintain this equilibrium, whereas excessive cytotoxicity by natural killer cells or a Th1-dominant T helper response can provoke trophoblast damage. Endometrial immune dysfunction, altered cytokine profiles and aberrant signalling pathways such as STAT3 activation have all been implicated in unexplained losses. Advances in single-cell profiling and immunomodulatory therapies now offer fresh insights into restoring immune balance and improving clinical outcomes.
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Immunological Mechanisms in Recurrent Pregnancy Loss publication trend
The graph below shows the total number of articles in immunological mechanisms in recurrent pregnancy loss across all publications each year (not limited to Nature Index journals).
Technical terms
Uterine natural killer (uNK) cells: A specialised subset of natural killer lymphocytes in the decidua that, instead of killing trophoblasts, secrete cytokines and angiogenic factors to support placental development.
T helper (Th) cells: CD4+ T lymphocytes differentiating into subsets (Th1, Th2, Th17, Th22, Tfh) that orchestrate pro-inflammatory or anti-inflammatory responses through distinct cytokine profiles.
Regulatory T (Treg) cells: A subset of CD4+ T cells expressing Foxp3 that suppress excessive immune activation and maintain tolerance to the semi-allogeneic fetus.
Cytokines: Small secreted proteins, such as interleukins and interferons, that mediate communication between immune cells and regulate inflammation, tolerance and tissue remodelling.
Decidual immune microenvironment: The local network of maternal immune cells, cytokines and signalling molecules within the uterine lining that governs implantation and placental growth.
References
- The role of uterine natural killer cells in recurrent pregnancy loss and possible treatment options. Fertility and Sterility (2023).
- T Helper (Th) Cell Profiles in Pregnancy and Recurrent Pregnancy Losses: Th1/Th2/Th9/Th17/Th22/Tfh Cells. Frontiers in Immunology (2020).
- Endometrial Immune Dysfunction in Recurrent Pregnancy Loss. International Journal of Molecular Sciences (2019).
- The Update Immune-Regulatory Role of Pro- and Anti-Inflammatory Cytokines in Recurrent Pregnancy Losses. International Journal of Molecular Sciences (2022).
- Differences in Cytokine Expression and STAT3 Activation between Healthy Controls and Patients of Unexplained Recurrent Spontaneous Abortion (URSA) during Early Pregnancy. PLOS ONE (2016).
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