Oxidative Stress and Hemolysis in Preeclampsia Mechanisms

Preeclampsia is a complex pregnancy disorder characterised by new-onset hypertension and end-organ dysfunction after 20 weeks’ gestation. Central to its pathophysiology is impaired placental perfusion, leading to cycles of hypoxia and reperfusion that generate excessive reactive oxygen species (ROS). This oxidative stress induces lipid peroxidation, protein oxidation and endothelial injury, contributing to widespread maternal vascular dysfunction. Parallel to this, placental barrier damage allows release of free fetal haemoglobin into the maternal circulation. Unbound haemoglobin avidly scavenges nitric oxide, promoting vasoconstriction, and undergoes auto-oxidation to yield further ROS and pro-inflammatory heme derivatives. Endogenous defence systems—including haptoglobin, hemopexin and α1-microglobulin—are rapidly overwhelmed, amplifying cellular damage. The resulting interplay between oxidative injury and haemolysis fuels systemic inflammation, hypertension and multiorgan manifestations of preeclampsia. Understanding these mechanisms has global relevance, given the condition’s prevalence and its contribution to maternal and perinatal morbidity. Emerging insights into molecular pathways are informing novel biomarker strategies and therapeutic avenues, such as targeted antioxidant delivery and haemoglobin-scavenging agents, with the aim of reducing disease severity and improving outcomes for mother and child.

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Oxidative Stress and Hemolysis in Preeclampsia Mechanisms publication trend

The graph below shows the total number of articles in oxidative stress and hemolysis in preeclampsia mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Oxidative stress: Imbalance between reactive oxygen species production and antioxidant defence.

Haemolysis: Destruction of red blood cells with release of haemoglobin into plasma.

Preeclampsia: A pregnancy-specific syndrome of hypertension and organ dysfunction after mid-gestation.

Free fetal haemoglobin: Cell-free haemoglobin derived from fetal erythrocytes that catalyses further ROS formation.

α1-Microglobulin (A1M): Endogenous lipocalin protein that binds haem and radicals, protecting tissues from oxidative damage.

Reactive oxygen species (ROS): Highly reactive oxygen-derived molecules that can damage lipids, proteins and nucleic acids.

References

1. Placental Disease and the Maternal Syndrome of Preeclampsia: Missing Links?. Current Hypertension Reports (2013).
2. Oxidative stress in preeclampsia and the role of free fetal hemoglobin. Frontiers in Physiology (2015).
3. Structure, Functions, and Physiological Roles of the Lipocalin α1-Microglobulin (A1M). Frontiers in Physiology (2021).
4. Characterization of heme binding to recombinant α1-microglobulin. Frontiers in Physiology (2014).
5. The Lipocalin α1-Microglobulin Has Radical Scavenging Activity*. Journal of Biological Chemistry (2007).
6. The Role of α1-Microglobulin (A1M) in Erythropoiesis and Erythrocyte Homeostasis—Therapeutic Opportunities in Hemolytic Conditions. International Journal of Molecular Sciences (2020).
7. The Human Endogenous Protection System against Cell-Free Hemoglobin and Heme Is Overwhelmed in Preeclampsia and Provides Potential Biomarkers and Clinical Indicators. PLOS ONE (2015).
8. A1M/α1-Microglobulin Protects from Heme-Induced Placental and Renal Damage in a Pregnant Sheep Model of Preeclampsia. PLOS ONE (2014).
9. A1M Ameliorates Preeclampsia-Like Symptoms in Placenta and Kidney Induced by Cell-Free Fetal Hemoglobin in Rabbit. PLOS ONE (2015).
10. Recombinant alpha-1-microglobulin: a potential treatment for preeclampsia. Drug Discovery Today (2016).