Uterine Natural Killer Cell Dynamics in Pregnancy
Summary
Uterine natural killer (uNK) cells represent a predominant lymphocyte population in the pregnant endometrium, orchestrating crucial interactions at the maternal–fetal interface. During the menstrual cycle and early gestation, distinct NK cell subsets arise, including circulating conventional NK cells and tissue-resident NK (trNK) cells that home to or differentiate within the uterus. Under the influence of ovarian steroids, notably progesterone, these cells expand and acquire a specialised decidual phenotype that supports trophoblast invasion, spiral artery remodelling and immunological tolerance. Through a balanced repertoire of activating and inhibitory receptors, NK cells regulate cytokine and growth factor production, thus promoting placentation, fetal growth and vascular adaptation. Dysregulation of uNK cell number, receptor–ligand interactions or effector function has been implicated in pregnancy complications such as preeclampsia, recurrent miscarriage and abnormal placentation. Emerging evidence also underscores the role of metabolic and lipid mediators in modulating NK cell adhesion and cytotoxicity at the maternal–fetal interface. Given the global burden of hypertensive disorders and fetal growth restriction, elucidating uNK cell biology has practical applications for developing targeted immunotherapies or biomarker-based risk stratification. Investigations into receptor genetics, ligand polymorphisms and hormonal programmes further inform personalised approaches to managing reproductive health.
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Uterine Natural Killer Cell Dynamics in Pregnancy publication trend
The graph below shows the total number of articles in uterine natural killer cell dynamics in pregnancy across all publications each year (not limited to Nature Index journals).
Technical terms
Uterine natural killer (uNK) cells: Innate lymphocytes abundant in the decidua that regulate vascular remodelling and immune tolerance during pregnancy.
Decidual natural killer (dNK) cells: Subset of uNK cells localised in the decidua, with specialised functions in trophoblast invasion and spiral artery modification.
Tissue-resident NK (trNK) cells: NK cells that remain in situ, distinct from circulating counterparts, and influenced by local hormonal signals.
Spiral artery remodelling: Structural adaptation of maternal arteries in the endometrium to ensure adequate blood flow to the developing placenta.
Trophoblast invasion: Process by which fetal trophoblast cells penetrate the decidua to establish the placenta and maternal–fetal interface.
Killer cell immunoglobulin-like receptor (KIR): Family of NK cell receptors that interact with HLA molecules to regulate activation and inhibition of NK cells.
CD96: Immunomodulatory receptor on NK cells that influences adhesion and cytotoxic functions, particularly at the maternal–fetal interface.
References
- Tissue-resident natural killer cells derived from conventional natural killer cells are regulated by progesterone in the uterus. Mucosal Immunology (2024).
- The central role of natural killer cells in preeclampsia. Frontiers in Immunology (2023).
- Palmitic Acid Upregulates CD96 Expression to Mediate Maternal–Foetal Interface Immune Tolerance by Inhibiting Cytotoxic Activity and Promoting Adhesion Function in Human Decidual Natural Killer Cells. Bioengineering (2023).
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