TY - JOUR T1 - The Imidazoacridinone Antitumor Drug, C-1311, Is Metabolized by Flavin Monooxygenases but Not by Cytochrome P450s JF - Drug Metabolism and Disposition JO - Drug Metab Dispos SP - 1423 LP - 1432 DO - 10.1124/dmd.111.038984 VL - 39 IS - 8 AU - Agnieszka Potega AU - Emilia Dabrowska AU - Magdalena Niemira AU - Agata Kot-Wasik AU - Sebastien Ronseaux AU - Colin J. Henderson AU - C. Roland Wolf AU - Zofia Mazerska Y1 - 2011/08/01 UR - http://dmd.aspetjournals.org/content/39/8/1423.abstract N2 - 5-Diethylaminoethylamino-8-hydroxyimidazoacridinone (C-1311) is an antitumor agent that is also active against autoimmune diseases. The intention of the present studies was to elucidate the role of selected liver enzymes in metabolism of C-1311 and the less active 8-methyl derivative, 5-diethylaminoethylamino-8-methoxyimidazoacridinone (C-1330). Compounds were incubated with rat liver microsomal fraction, with a set of 16 human liver protein samples, and with human recombinant isoenzymes of cytochrome P450, flavin monooxygenases (FMO), and UDP-glucuronosyltransferase (UGT). Our results showed that C-1311 and C-1330 were metabolized with human liver microsomal enzymes but not with any tested human recombinant cytochromes P450 (P450s). Two of these, CYP1A2 and CYP3A4, were inhibited by both compounds. In addition, results of C-1311 elimination from hepatic reductase-null mice, in which liver NADPH-P450 oxidoreductase has been deleted indicated that liver P450s were slightly engaged in drug transformation. In contrast, both compounds were good substrates for human recombinant FMO1 and FMO3 but not for FMO5. The product of FMO metabolism, PFMO, which is identified as an N-oxide derivative, was identical to P3R of liver microsomes. P3R was observed even in the presence of the P450 inhibitor, 1-aminobenzotriazole, and it disappeared after heating. Therefore, FMO enzymes could be responsible for microsomal metabolism to P3R = PFMO. Glucuronidation on the 8-hydroxyl group of C-1311 was observed with liver microsomes supported by UDP-glucuronic acid and with recombinant UGT1A1, but it was not the case with UGT2B7. Summing up, we showed that, whereas liver P450 isoenzymes were involved in the metabolism of C-1311 to a limited extent, FMO plays a significant role in the microsomal transformations of this compound, which is also a specific substrate of UGT1A1. ER -