AMP-activated protein kinase–Endothelial nitric oxide synthase signaling pathway (AMPK–eNOS pathway)

The AMP-activated protein kinase–Endothelial nitric oxide synthase (AMPK–eNOS) signaling pathway is a critical regulatory axis that links cellular energy status to vascular homeostasis (PubMed: 10334992). AMPK acts as a metabolic master switch that, when activated by an increased AMP/ATP ratio or pharmacological agents, phosphorylates eNOS at its Ser1177 activation site (UniProt: P29474, Q13131). This phosphorylation increases the production of nitric oxide (NO), a potent vasodilator that maintains vascular tone and inhibits platelet aggregation and leukocyte adhesion (PubMed: 11452310). Dysregulation of this pathway is a hallmark of endothelial dysfunction, contributing significantly to the pathogenesis of atherosclerosis, hypertension, and diabetic vascular complications (PubMed: 22403519). Pharmacological targeting of this axis, notably through drugs like metformin and statins, aims to restore endothelial health and improve cardiovascular outcomes (PubMed: 15833943). Beyond vasodilation, the pathway also plays roles in promoting angiogenesis and reducing oxidative stress within the vessel wall (PubMed: 19074255).

Other names

AMPK/eNOS axisAMPK-mediated eNOS activation5'-AMP-activated protein kinase/endothelial nitric oxide synthase pathway

Activation of AMP-activated protein kinase (AMPK) leads to the direct phosphorylation of endothelial nitric oxide synthase (eNOS) at the Serine 1177 residue, which enhances the enzyme's activity and increases the production of nitric oxide (NO) in vascular endothelial cells (PubMed: 10334992).