Structure activity relationship of human microsomal epoxide hydrolase inhibition by amide and acid analogues of valproic acid.
PURPOSE: The purpose of this study was to evaluate the in vitro inhibitory potency of various amide analogues and derivatives of valproic acid toward human microsomal epoxide hydrolase ( mEH). METHODS: mEH inhibition was evaluated in human liver microsomes with 25 microM (S)-(+)-styrene oxide as the substrate. Inhibitory potency expressed as the median inhibitory concentration (IC50) was calculated from the formation rate of the enzymatic product, (S)-(+)-1-phenyl-1,2-ethanediol. RESULTS: Inhibitory potency was directly correlated with lipophilicity and became significant for amides with a minimum of eight carbon atoms. Branched eight-carbon amides were more potent inhibitors than their straight chain isomer, octanamide. N-substituted valproylamide analogues had reduced or abolished inhibition potency with the exception of valproyl hydroxamic acid being a potent inhibitor. Inhibition potency was not stereoselective in two cases of chiral valpromide isomers. Valproyl glycinamide, a new antiepileptic drug currently undergoing phase II clinical trials and its major metabolite valproyl glycine were weak mEH inhibitors. Acid isomers of valproic acid were not potent mEH inhibitors. CONCLUSIONS: The structural requirements for valproylamide analogues for potent in vitro mEH inhibition are: an unsubstituted amide moiety; two saturated alkyl side chains; a minimum of eight carbons in the molecule.[1]References
- Structure activity relationship of human microsomal epoxide hydrolase inhibition by amide and acid analogues of valproic acid. Spiegelstein, O., Kroetz, D.L., Levy, R.H., Yagen, B., Hurst, S.I., Levi, M., Haj-Yehia, A., Bialer, M. Pharm. Res. (2000) [Pubmed]
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