Phospholipase A2 group IIA (PLA2G2A) (PLA2G2A)

Phospholipase A2 group IIA (PLA2G2A) is a low-molecular-weight secretory enzyme that plays a fundamental role in lipid metabolism and the systemic inflammatory cascade (UniProt P14555). It catalyzes the calcium-dependent hydrolysis of the sn-2 ester bond of phospholipids, releasing free fatty acids like arachidonic acid and lysophospholipids, which are precursors for pro-inflammatory eicosanoids such as prostaglandins and leukotrienes (PubMed: 2925633). Beyond its metabolic function, PLA2G2A acts as a critical component of the innate immune system by exhibiting potent bactericidal activity against Gram-positive bacteria through direct membrane disruption (PubMed: 11134015). High circulating levels of the enzyme are established biomarkers for disease severity in conditions like sepsis, rheumatoid arthritis, and acute coronary syndrome (PubMed: 23143307). In oncology, its role is context-dependent; while it acts as a tumor suppressor in colorectal cancer (associated with the MOM1 locus), it is often upregulated in other cancers like prostate and pancreatic cancer, where it contributes to tumor progression and immune evasion (MDPI: 10.3390/cells11050882). Therapeutic strategies have primarily utilized small-molecule inhibitors such as varespladib (LY315920) and its prodrug methyl-varespladib (LY333013), though these have faced clinical challenges including a lack of efficacy in large-scale trials and potential safety signals regarding cardiovascular events (NIH/PubChem). Despite these setbacks, it remains a target of interest for its dual role in mediating systemic inflammation and managing the host microbiota (PubMed: 35073105).

Other names

sPLA2-IIAGroup IIA secretory phospholipase A2Non-pancreatic secretory phospholipase A2Phosphatidylcholine 2-acylhydrolase 2AMOM1 (Modifier of min 1)GIIC sPLA2

Competitive inhibition of the enzyme's catalytic active site, preventing the hydrolysis of membrane phospholipids and the subsequent release of pro-inflammatory lipid precursors.