Lipase that catalyzes the hydrolysis of arachidonic acid (AA)-esterified diacylglycerols (DAGs) to produce the principal endocannabinoid, 2-arachidonoylglycerol (2-AG) which can be further cleaved by downstream enzymes to release arachidonic acid (AA) for cyclooxygenase (COX)-mediated eicosanoid production. Preferentially hydrolyzes DAGs at the sn-1 position in a calcium-dependent manner and has negligible activity against other lipids including monoacylglycerols and phospholipids (By similarity). Plays a key role in the regulation of 2-AG and AA pools utilized by COX1/2 to generate lipid mediators of macrophage and microglia inflammatory responses. Functions also as a polyunsaturated fatty acids-specific triacylglycerol lipase in macrophages. Plays an important role to support the metabolic and signaling demands of macrophages (By similarity). a 1,2-diacyl-sn-glycerol + H2O = a 2-acylglycerol + a fatty acid + H(+) 1-octadecanoyl-2-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-sn-glycerol + H2O = 2-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-glycerol + H(+) + octadecanoate 1,2-di-(9Z-octadecenoyl)-sn-glycerol + H2O = (9Z)-octadecenoate + 2-(9Z-octadecenoyl)-glycerol + H(+) 1-(9Z-octadecenoyl)-2-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-sn-glycerol + H2O = (9Z)-octadecenoate + 2-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-glycerol + H(+) 1-(9Z-octadecenoyl)-2-octadecanoyl-sn-glycerol + H2O = (9Z)-octadecenoate + 2-octadecanoylglycerol + H(+) 1-(9Z-octadecenoyl)-2-(9Z,12Z-octadecadienoyl)-sn-glycerol + H2O = (9Z)-octadecenoate + 2-(9Z,12Z-octadecadienoyl)-glycerol + H(+) 1-(9Z-octadecenoyl)-2-O-(5Z,8Z,11Z,14Z-eicosatetraenyl)-sn-glycerol + H2O = (9Z)-octadecenoate + 2-O-(5Z,8Z,11Z,14Z)-eicosatetraenylglycerol + H(+) a triacylglycerol + H2O = a diacylglycerol + a fatty acid + H(+) 1,2,3-tri-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-glycerol + H2O = (5Z,8Z,11Z,14Z)-eicosatetraenoate + a di-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-glycerol + H(+) 1,2,3-(4Z,7Z,10Z,13Z,16Z,19Z-docosahexaenoyl)-glycerol + H2O = (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate + a di-(4Z,7Z,10Z,13Z,16Z,19Z-docosahexaenoyl)-glycerol + H(+) Inhibited by the 1,2,3-triazole urea covalent inhibitors KT109 and KT172 (By similarity). Inhibited by p-hydroxy-mercuri-benzoate and HgCl(2), but not by PMSF. Also inhibited by RHC80267, a drug that blocks 2-AG formation (By similarity). Expressed in corticostriatal and hippocampal slices. Highly expressed in striatal neurons (at protein level). Belongs to the AB hydrolase superfamily. Lipase family.