Endothelial Function and Vascular Dynamics in Pregnancy

During pregnancy the maternal vascular system undergoes profound adaptive changes to meet the increased metabolic and oxygen demands of the developing foetus. Endothelial cells lining the uteroplacental and systemic vasculature orchestrate vasodilatation, angiogenesis and barrier function through finely tuned release of bioactive molecules, notably nitric oxide, prostacyclin and endothelin. Shear stress induced by expanded blood volume stimulates phosphorylation of endothelial nitric oxide synthase, leading to elevated nitric oxide production and reduced vascular resistance. Concurrently, hormonal mediators such as oestrogen and progesterone enhance endothelial proliferation and modulate ion channel expression, ensuring adequate placental perfusion. Disruption of these processes by oxidative stress or epigenetic modifications can precipitate disorders such as pre-eclampsia and foetal growth restriction with long-term cardiovascular consequences for both mother and child. Recent advances have shed light on the molecular crosstalk between maternal erythrocytes, trophoblasts and vascular smooth muscle cells, offering pathways for targeted therapeutic intervention and predictive diagnostics in adverse pregnancies.

Research from Nature Portfolio

Elevated levels of the cytokine LIGHT have been identified in trophoblast cells of hydatidiform moles, where they correlate with excess soluble fms-like tyrosine kinase-1 production. This discovery delineates a mechanism linking abnormal placental proliferation to early-onset pre-eclampsia via LIGHT-driven upregulation of anti-angiogenic factors, highlighting potential targets to prevent hypertensive complications in molar pregnancies.

Endothelial Function and Vascular Dynamics in Pregnancy publication trend

The graph below shows the total number of articles in endothelial function and vascular dynamics in pregnancy across all publications each year (not limited to Nature Index journals).

Technical terms

Endothelium: A monolayer of specialised cells lining blood vessels that regulates vascular tone, permeability and angiogenesis.

Nitric oxide (NO): A gaseous signalling molecule synthesised by endothelial nitric oxide synthase that induces vasodilatation and inhibits platelet aggregation.

Shear stress: The frictional force exerted by blood flow on the endothelial surface, triggering mechanotransduction pathways and enzyme activation.

Soluble guanylate cyclase (sGC): An enzyme in vascular smooth muscle that, upon binding NO, converts GTP to cGMP, promoting relaxation.

Pre-eclampsia: A hypertensive disorder of pregnancy characterised by high blood pressure and organ dysfunction, often linked to placental endothelial impairment.

Protein kinase Cβ (PKCβ): An isoform of protein kinase C involved in signal transduction pathways that modulate vascular smooth muscle contraction.

References

1. In vitro fertilization with frozen embryo transfer increased histamine-mediated contractile sensitivity via PKCβ in human umbilical vein. Reproductive Biology and Endocrinology (2023).
2. Specific dilation pattern in placental circulation and the NO/sGC role in preeclampsia placental vessels. Frontiers in Endocrinology (2023).
3. Effects of Combined Phosphorylation at Ser-617 and Ser-1179 in Endothelial Nitric-oxide Synthase on EC50(Ca2+) Values for Calmodulin Binding and Enzyme Activation*. Journal of Biological Chemistry (2009).
4. Maternal erythrocyte ENT1–mediated AMPK activation counteracts placental hypoxia and supports fetal growth. JCI Insight (2020).
5. Increased LIGHT leading to sFlt-1 elevation underlies the pathogenic link between hydatidiform mole and preeclampsia. Scientific Reports (2019).