title: 1,2-Diacylglycerols do not potentiate the action of phospholipases A2 and C in human platelets.
abstract: 1,2-Diacylglycerol has recently been reported to potentiate the ability of phospholipases A and C to hydrolyze phospholipids in a cell-free system. The present study has been undertaken to investigate whether 1,2-diacylglycerol can also perform this function in intact cells using the platelet as a test system. Exogenous 1-oleoyl-2-acetyl-glycerol ( OAG ) and 1,2- didecanoylglycerol , at concentrations sufficient to produce maximal phosphorylation of a 40,000 dalton protein, caused no significant formation of [3H]inositol phosphates and [32P]phosphatidic acid (products of phospholipase C activation) or [14C]arachidonic acid metabolites and lysophosphatidyl[3H]inositol (products of phospholipase A2 activation). These data therefore imply that 1,2-diacylglycerols do not potentiate the actions of phospholipases A2 and C in intact platelets at concentrations that are physiologically relevant.
mesh_terms: D001792:Blood Platelets / Q000378:metabolism*; D001798:Blood Proteins / Q000378:metabolism; D004075:Diglycerides / Q000097:blood / Q000502:physiology*; D005989:Glycerides / Q000502:physiology*; D006801:Humans; D006868:Hydrolysis; D066298:In Vitro Techniques; D010740:Phospholipases / Q000378:metabolism*; D010741:Phospholipases A / Q000378:metabolism*; D054467:Phospholipases A2; D010766:Phosphorylation; D010738:Type C Phospholipases / Q000378:metabolism*
chemical_list: D001798:Blood Proteins; D004075:Diglycerides; D005989:Glycerides; D010740:Phospholipases; D010741:Phospholipases A; D054467:Phospholipases A2; D010738:Type C Phospholipases