Phospholipase A2 Function and Regulation in Biological Systems
Summary
Phospholipases A2 (PLA2) constitute a versatile enzyme superfamily that catalyses hydrolysis of the sn-2 ester bond in glycerophospholipids, liberating free fatty acids and lysophospholipids. This reaction represents the gateway to generation of bioactive lipid mediators, including eicosanoids and specialised pro-resolving molecules, which orchestrate inflammation, vascular homeostasis, membrane remodelling and cell survival. PLA2 isoforms are categorised by their cellular localisation, requirement for Ca2+ and domain architecture: cytosolic (cPLA2), secreted (sPLA2) and calcium-independent (iPLA2). Enzyme activity is finely tuned through Ca2+-binding to C2 domains, phosphorylation cascades, allosteric interactions with calmodulin and membrane lipids, and transcriptional control. Spatial targeting within cellular membranes depends on lipid composition, curvature and accessory proteins, thereby dictating distinct substrate specificities. Dysregulation of PLA2 pathways underlies diverse pathologies, from cardiovascular and neurodegenerative disorders to metabolic syndrome and autoimmunity. Advances in high-resolution structural biology and lipidomic profiling have elucidated isoform-specific mechanisms of action and revealed novel regulatory interfaces. Together, these insights inform the design of next-generation modulators aimed at selectively tuning PLA2-mediated lipid signalling with improved safety and efficacy.
Research from Nature Portfolio
Recent studies have defined a pathological signalling axis in the heart involving calcium-independent PLA2β (iPLA2β). Under pressure overload, iPLA2β generates 18:0 lysophosphatidylserine, which engages G protein-coupled receptor 34 on cardiomyocytes and triggers necrotic cell death and contractile dysfunction. Genetic ablation of iPLA2β or its receptor preserves ventricular function, highlighting a potential target for heart failure therapy. Complementary structural work has provided a detailed crystal structure of human iPLA2β, revealing a tight dimer of catalytic domains flanked by outwardly flared ankyrin repeats. This arrangement allows cooperative activation and internal transacylation, and identifies a single calmodulin molecule as an allosteric inhibitor that bridges both active sites. The structure explains membrane-targeting mechanisms and offers new sites for selective inhibitor design, with implications for inflammatory and neurodegenerative diseases.
Phospholipase A2 Function and Regulation in Biological Systems publication trend
The graph below shows the total number of articles in phospholipase a2 function and regulation in biological systems across all publications each year (not limited to Nature Index journals).
Technical terms
Phospholipase A2 (PLA2): Enzyme superfamily that hydrolyses the sn-2 ester bond of glycerophospholipids, releasing free fatty acids and lysophospholipids.
cPLA2: Cytosolic PLA2, a calcium-dependent isoform that typically releases arachidonic acid for eicosanoid synthesis.
sPLA2: Secreted PLA2, a small calcium-dependent enzyme that can act extracellularly or at membrane surfaces.
iPLA2: Calcium-independent PLA2, involved in membrane remodelling and generation of lipid mediators without requiring Ca2+.
Lysophosphatidylserine: A lysophospholipid produced by PLA2 that can act as a signalling molecule via specific receptors.
Eicosanoids: Bioactive lipid mediators derived from arachidonic acid, including prostaglandins, leukotrienes and thromboxanes.
Lipidomics: Comprehensive analysis of cellular lipid species and their dynamic changes under physiological or pathological conditions.
Ankyrin repeat: Protein structural motif involved in protein-protein interactions, here mediating membrane association of iPLA2β.
Calmodulin: Calcium-binding regulatory protein that modulates the activity of various enzymes, including PLA2 isoforms.
References
- Lysophosphatidylserine induces necrosis in pressure overloaded male mouse hearts via G protein coupled receptor 34. Nature Communications (2023).
- The structure of iPLA2β reveals dimeric active sites and suggests mechanisms of regulation and localization. Nature Communications (2018).
- Differential lipid signaling from CD4+ and CD8+ T cells contributes to type 1 diabetes development. Frontiers in Immunology (2024).
- Lipidomics of phospholipase A2 reveals exquisite specificity in macrophages. Journal of Lipid Research (2024).
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