PMID: 11313109Apr 21, 2001Paper

Influence of prenylated and non-prenylated flavonoids on liver microsomal lipid peroxidation and oxidative injury in rat hepatocytes

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
R J RodriguezD R Buhler

Abstract

Prenylated chalcones from hops and beer were compared with non-prenylated flavonoids [chalconaringenin (CN), naringenin (NG), genistein (GS) and quercetin (QC)] for their ability to inhibit lipid peroxidation in rat liver microsomes. Chalcones with prenyl- or geranyl-groups (5 and 25 microM) were more effective inhibitors of microsomal lipid peroxidation than CN, NG or GS induced by Fe(2+)/ascorbate. Prenylated chalcones were effective inhibitors of microsomal lipid peroxidation induced by Fe(3+)-ADP/NADPH and by tert-butyl hydroperoxide (TBH) but to a lesser extent compared to the Fe(2+)/ascorbate system. An increase of prenyl substituents decreased antioxidant activity in the lipid peroxidation systems. Certain flavonoids behaved as prooxidants in the iron-dependent lipid peroxidation systems. For example, at 5 microM, NG enhanced iron/ascorbate-induced lipid peroxidation whereas CN, diprenylxanthohumol and tetrahydroxanthohumol enhanced Fe(3+)-ADP/NADPH-induced lipid peroxidation. None of the flavonoids (25 microM), except QC, inhibited NADPH cytochrome P450-reductase activity of rat liver microsomes, suggesting that the mechanism of inhibition of lipid peroxidation induced by Fe(3+)-ADP/NADPH is not due to inhibition of the...Continue Reading

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