Platelet-Activating Factor Biology and Cardiovascular Mechanisms
Summary
Platelet-Activating Factor (PAF) is a bioactive phospholipid that orchestrates diverse events in vascular homeostasis and inflammation. Synthesised rapidly in response to cellular stimuli, PAF engages a specific G-protein-coupled receptor on the surface of platelets, endothelial cells and leukocytes, triggering calcium mobilisation, cytoskeletal rearrangement and the release of proinflammatory mediators. In the cardiovascular system, PAF modulates endothelial barrier function, promotes leukocyte adhesion and transmigration, and influences smooth muscle tone. Its production involves a deacylation–reacylation pathway in which phospholipase A2 liberates a lyso-phospholipid intermediate that is acetylated by a cytosolic acetyltransferase. Termination of the signal is achieved by PAF acetylhydrolase (PAFAH), which hydrolyses the sn-2 acetyl group, restoring membrane homeostasis and limiting excessive inflammation. Dysregulation of PAF synthesis or degradation has been implicated in atherogenesis, ischaemia–reperfusion injury and hypertension, where unrestrained PAF activity contributes to endothelial dysfunction, oxidative stress and thrombosis.
Research from Nature Portfolio
Recent studies have illuminated the contribution of PAF signalling to endothelial barrier integrity under pathological shear stress. Single-cell transcriptomic analysis of human vascular endothelium has identified a subset of PAF-responsive cells that upregulate adhesion molecules and procoagulant factors in early atherosclerotic lesions. Concurrently, work employing genetic deletion of the PAF receptor in murine models has revealed attenuation of neointima formation following vascular injury, highlighting PAF receptor blockade as a strategy to reduce restenosis. Another investigation has characterised the interplay between PAF and specialised proresolving lipid mediators, demonstrating that PAF receptor activation can be counter-regulated by resolvin synthesis, thereby steering the transition from inflammation to repair in cardiac ischaemia.
Platelet-Activating Factor Biology and Cardiovascular Mechanisms publication trend
The graph below shows the total number of articles in platelet-activating factor biology and cardiovascular mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Platelet-Activating Factor (PAF): A short-chain phospholipid mediator that binds a specific G-protein-coupled receptor to induce platelet aggregation, inflammation and vascular permeability.
PAF receptor: A G-protein-coupled receptor on platelets, endothelial cells and leukocytes that transduces PAF signals into intracellular calcium fluxes and gene expression changes.
PAF acetylhydrolase (PAFAH): A plasma and intracellular enzyme that hydrolyses the sn-2 acetyl group of PAF, terminating its bioactivity and degrading oxidised phospholipids.
Phospholipase A2 (PLA2): An enzyme that cleaves the sn-2 acyl bond of glycerophospholipids to generate lyso-phospholipids and free fatty acids, initiating PAF biosynthesis.
Eicosanoids: Bioactive lipid mediators derived from arachidonic acid that regulate vascular tone, platelet function and inflammation, closely linked to PAF pathways.
References
- The role of PAF in immunopathology: From immediate hypersensitivity reactions to fungal defense. BioFactors (2022).
- Human plasma platelet-activating factor acetylhydrolase. Oxidatively fragmented phospholipids as substrates. Journal of Biological Chemistry (1991).
- Biosynthesis of 1-alkyl-2-acetyl-sn-glycero-3-phosphocholine (platelet-activating factor) from 1-alkyl-2-acyl-sn-glycero-3-phosphocholine by rat alveolar macrophages. Phospholipase A2 and acetyltransferase activities during phagocytosis and ionophore stimulation.. Journal of Biological Chemistry (1983).
- Platelet-activating factor: a phospholipid autacoid with diverse actions. Journal of Lipid Research (1993).
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