Inhibition of Secreted Phospholipase A<sub>2</sub>. 4-Glycerol Derivatives of 4,5-Dihydro-3-(4-tetradecyloxybenzyl)-1,2,4-4<i>H</i>-oxadiazol-5-one with Broad Activities
作者:Mohamed Touaibia、Atimé Djimdé、Fei Cao、Eric Boilard、Sofiane Bezzine、Gérard Lambeau、Catherine Redeuilh、Aazdine Lamouri、France Massicot、François Chau、Chang-Zhi Dong、Françoise Heymans
DOI:10.1021/jm060082n
日期:2007.4.1
Secreted phospholipases A(2) (sPLA(2)s) have been reported to play an important role in various inflammatory conditions and thus represent an attractive therapeutic target. Previous SAR studies from our laboratory have revealed certain important features of our recently discovered specific hGIIA sPLA(2) inhibitors, and we report here the synthesis and biological activities of glycerol-containing derivatives of our lead compound III (Figure 1). Efficient and selective synthesis methods have been developed to make glycerol trisubstituted by different groups on desired positions. In terms of biological activities, the best compounds (A3, A6, and A15) are more active than III (Figure 1), as potent as Me-Indoxam, an sPLA(2)s inhibitor of reference, against hGIIA, hGV, and hGX sPLA(2)s and at least 10 times less active toward the GIB enzymes in two in vitro assay systems. By synthesis of enantiopure (S)-A6, we demonstrated that no important improvement of the inhibitory potency could be achieved by this approach. Furthermore, the results show that the global lipophilicity is likely responsible for the anti-PLA(2) activity and two oxadiazolone moieties seem too big to be accommodated by the active site of the hGIIA enzyme.