Symmetrically substituted dichlorophenes inhibit -acyl-phosphatidylethanolamine phospholipase D.

Aggarwal G, Zarrow JE, Mashhadi Z, Flynn CR, Vinson P, Weaver CD, Davies SS
J Biol Chem. 2020 295 (21): 7289-7300

PMID: 32284327 · PMCID: PMC7247316 · DOI:10.1074/jbc.RA120.013362

-Acyl-phosphatidylethanolamine phospholipase D (NAPE-PLD) (EC 3.1.4.4) catalyzes the final step in the biosynthesis of -acyl-ethanolamides. Reduced NAPE-PLD expression and activity may contribute to obesity and inflammation, but a lack of effective NAPE-PLD inhibitors has been a major obstacle to elucidating the role of NAPE-PLD and -acyl-ethanolamide biosynthesis in these processes. The endogenous bile acid lithocholic acid (LCA) inhibits NAPE-PLD activity (with an IC of 68 μm), but LCA is also a highly potent ligand for TGR5 (EC 0.52 μm). Recently, the first selective small-molecule inhibitor of NAPE-PLD, ARN19874, has been reported (having an IC of 34 μm). To identify more potent inhibitors of NAPE-PLD, here we used a quenched fluorescent NAPE analog, PED-A1, as a substrate for recombinant mouse Nape-pld to screen a panel of bile acids and a library of experimental compounds (the Spectrum Collection). Muricholic acids and several other bile acids inhibited Nape-pld with potency similar to that of LCA. We identified 14 potent Nape-pld inhibitors in the Spectrum Collection, with the two most potent (IC = ∼2 μm) being symmetrically substituted dichlorophenes, hexachlorophene and bithionol. Structure-activity relationship assays using additional substituted dichlorophenes identified key moieties needed for Nape-pld inhibition. Both hexachlorophene and bithionol exhibited significant selectivity for Nape-pld compared with nontarget lipase activities such as PLD or serum lipase. Both also effectively inhibited NAPE-PLD activity in cultured HEK293 cells. We conclude that symmetrically substituted dichlorophenes potently inhibit NAPE-PLD in cultured cells and have significant selectivity for NAPE-PLD other tissue-associated lipases.

© 2020 Aggarwal et al.

MeSH Terms (13)

Animals Bacterial Proteins Bithionol Dichlorophen Enzyme Inhibitors HEK293 Cells Hexachlorophene Humans Mice Phospholipase D Quinazolines Streptomyces Sulfonamides

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