Oxidative stress and endothelial dysfunction pathways

Oxidative stress and endothelial dysfunction pathways represent a complex network of biochemical interactions where an imbalance between reactive oxygen species (ROS) and antioxidant defenses leads to impaired vascular endothelium function (NIH). The endothelium is critical for maintaining vascular tone, primarily through the production of nitric oxide (NO), which facilitates vasodilation and inhibits platelet aggregation and inflammation (StatPearls). In states of oxidative stress, ROS such as superoxide anions react rapidly with NO to form peroxynitrite, thereby reducing NO bioavailability and causing the uncoupling of endothelial nitric oxide synthase (eNOS) (PubMed). This cascade promotes a pro-inflammatory and pro-thrombotic environment characterized by increased vascular permeability and leukocyte adhesion, which are hallmarks of atherosclerosis and hypertension (Nature Reviews Cardiology). Therapeutic strategies targeting these pathways include statins, ACE inhibitors, and Nrf2 activators, which aim to restore redox balance and improve vascular reactivity (Journal of Clinical Investigation).

Other names

Vascular oxidative stressEndothelial activationROS-mediated endothelial injuryRedox-regulated vascular signaling

Modulation of these pathways typically involves the reduction of reactive oxygen species (ROS) production (e.g., NADPH oxidase inhibition), enhancement of nitric oxide (NO) bioavailability, or the upregulation of endogenous antioxidant enzymes via the Nrf2/ARE signaling axis.