In essence, "phospholipase A" (PLA) means a group of enzymes that release fatty acids and lysophospholipids by hydrolyzing the sn-2 position of glycerophospholipids. To date, more than 50 enzymes possessing PLA or related lipid-metabolizing activities have been identified in mammals, and these are subdivided into several families in terms of their structures, catalytic mechanisms, tissue/cellular localizations, and evolutionary relationships. From a general viewpoint, the PLA superfamily has mainly been implicated in signal transduction, driving the production of a wide variety of bioactive lipid mediators. However, a growing body of evidence indicates that PLAs also contribute to phospholipid remodeling or recycling for membrane homeostasis, fatty acid β-oxidation for energy production, and barrier lipid formation on the body surface. Accordingly, PLA enzymes are considered one of the key regulators of a broad range of lipid metabolism, and perturbation of specific PLA-driven lipid pathways often disrupts tissue and cellular homeostasis and may be associated with a variety of diseases. This review covers current understanding of the physiological functions of the PLA superfamily, focusing particularly on the two major intracellular PLA families (Ca-dependent cytosolic PLAs and Ca-independent patatin-like PLAs) as well as other PLA families, based on studies using gene-manipulated mice and human diseases in combination with comprehensive lipidomics.
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