1-(5-Carboxyindol-1-yl)propan-2-one Inhibitors of Human Cytosolic Phospholipase A<sub>2</sub>α with Reduced Lipophilicity: Synthesis, Biological Activity, Metabolic Stability, Solubility, Bioavailability, And Topical in Vivo Activity
作者:Andreas Drews、Stefanie Bovens、Kirsten Roebrock、Cord Sunderkötter、Dirk Reinhardt、Michael Schäfers、Andrea van der Velde、Alwine Schulze Elfringhoff、Jörg Fabian、Matthias Lehr
DOI:10.1021/jm1001088
日期:2010.7.22
acids with 3-aryloxy-2-oxopropyl residues in position 1 were previously reported to be potent inhibitors of human cytosolic phospholipase A2α (cPLA2α). In continuation of our attempts to develop clinical active cPLA2α inhibitors, a series of structurally related indole-5-carboxylic acids with reduced lipophilicity was synthesized and tested for cPLA2α-inhibitory potency. Furthermore, the thermodynamic solubility
1-(5-Carboxyindol-1-yl)propan-2-one Inhibitors of Human Cytosolic Phospholipase A<sub>2</sub>α: Effect of Substituents in Position 3 of the Indole Scaffold on Inhibitory Potency, Metabolic Stability, Solubility, and Bioavailability
Indole-5-carboxylic acids with 3-aryloxy-2-oxopropyl residues in position I have been found to be potent inhibitors of human cytosolic phospholipase A(2)alpha (cPLA(2)alpha). In the course of structure-activity relationship studies, we investigated the effect of a substitution of indole 3 position with acyl, alkyl, and oxadiazole residues. The highest increase of inhibitory potency could be achieved by a 3-methyl-1,2, 4-oxadiazol-5-yl-moiety. Appropriate compound 40 revealed an IC50 of 0.0021 mu M against isolated cPLA(2)alpha. In a cellular assay applying human platelets 40 blocked cPLA(2)alpha. activity even with an IC50 of 0.0006 mu M. Metabolic stability and aqueous solubility of the target compounds were also determined. Furthermore, one selected compound was tested for peroral bioavailability in mice.
Synthesis, activity, metabolic stability and cell permeability of new cytosolic phospholipase A2α inhibitors with 1-indolyl-3-phenoxypropan-2-one structure
and glucuronosyltransferases, respectively. Here we show that the metabolicstability of these inhibitors can be improved by introducing alkyl substituents in the vicinity of the ketone group or by increasing their rigidity. Furthermore, permeability tests with Caco-2 cells revealed that the indole derivatives have only low permeability, which can be attributed to their affinity to efflux transporters