Design and Synthesis of a Novel and Potent Series of Inhibitors of Cytosolic Phospholipase A₂ Based on a 1,3-Disubstituted Propan-2-one Skeleton

Citations Over TimeTop 17% of 2002 papers

Abstract

Using knowledge of the substrate specificity of cPLA(2) (phospholipases A(2)), a novel series of inhibitors of this enzyme were designed based upon a three point model of inhibitor binding to the enzyme active site comprising a lipophilic anchor, an electrophilic serine "trap", and an acidic binding moiety. The resulting 1,3-diheteroatom-substituted propan-2-ones were evaluated as inhibitors of cPLA(2) in both aggregated bilayer and soluble substrate assays. Systematic variation of the lipophilic, electrophilic, and acidic groups revealed a well-defined structure-activity relationship against the enzyme. Optimization of each group led to compound 22 (AR-C70484XX), which contains a decyloxy lipophilic side chain, a 1,3-diaryloxypropan-2-one moiety as a unique serine trap, and a benzoic acid as the acidic binding group. AR-C70484XX was found to be among the most potent in vitro inhibitors of cPLA(2) described to date being more than 20-fold more active against the isolated enzyme (IC(50) = 0.03 microM) than the standard cPLA(2) inhibitor, arachidonyl trifluoromethyl ketone (AACOCF(3)), and also greater than 10-fold more active than AACOCF(3) against the cellular production of arachidonic acid by HL60 cells (IC(50) = 2.8 microM).

Related Papers

• → A novel type of phospholipase A2 inhibitor, thielocin A1.BETA., and mechanism of action.(1992)27 cited
• → Augmentation of Prostaglandin E2 Production by Mammalian Phospholipase A2 Added Exogenously1(1991)58 cited
• → Phospholipase A2 inactivation of microsomal 17β-hydroxysteroid oxidoreductase: Rates of phospholipid hydrolysis and enzyme inactivation, effects of hydrolysis products and properties of the phospholipase A2-treated enzyme(1980)13 cited
• → Quantification of the interaction between lysolecithin and phospholipase A2(1994)11 cited
• → Phospholipases A1 and A2 of rat liver plasma membranes; mechanism of action(1976)25 cited