Heptaocellular bioactivation and cytotoxicity of the synthetic endoperoxide antimalarial arteflene

J.L. Maggs, L.P.D. Bishop, K.T. Batty, C.C. Dodd, Kenneth Ilett, P.M. O'Neill, G. Edwards, B.K. Park

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Abstract

Arteflene is a synthetic endoperoxide antimalarial. Its peroxide bridge undergoes iron(II)-mediated reduction in vitro which yields a carbon-centered cyclohexyl radical and a mixture of cis- and trans-α,β-unsaturated ketones (enones). The enones are biliary metabolites in rats and therefore surrogate markers of bioactivation. Arteflene is reported to be more cytotoxic to primary rat hepatocytes than some non-endoperoxide antimalarials. Hepatic metabolism of arteflene was investigated in recirculating isolated perfused rat livers, and the drug’s metabolism and cytotoxicity were compared using hepatocytes from male rats. Both preparations metabolized [View the MathML source]arteflene to cis- and trans-[View the MathML source]enone, 8-hydroxyarteflene glucuronide and an unassigned isomeric glucuronide. During a 2 h liver perfusion, the cis- and trans-enones recovered in bile represented 8.1±3.4 and 11.3±4.6% (mean±S.D., N=6), respectively, of the [View the MathML source]arteflene (52 μM) added to the perfusate. After a 3 h incubation of [View the MathML source]arteflene (10 μM) with hepatocytes in suspension, the cis- and trans-enones comprised, respectively, 14.8±7.1 and 2.1±1.0% (N=4) of the recovered radioactivity; the corresponding data for cultured hepatocytes being 18.6±6.9 and 3.3±2.2%. Arteflene was significantly (P
Original languageEnglish
Pages (from-to)173-184
JournalChemico-Biological Interactions
Volume147
Issue number2
DOIs
Publication statusPublished - 2004

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