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Modulation of microsomal activity by potential chemopreventive agents of plant origin

Ten compounds with potential chemopreventive activity were studied to determine their effects on microsomal mixed‐function oxidase and epoxide hydratase activity. In these studies, the highest nontoxic concentration of each compound was incubated with 1 mg rat liver microsomal protein and either [H3]benzo[a]pyrene 4,5‐oxide or [H3]benzo[a]pyrene 7,8‐dihydrodiol. High performance liquid chromatographic analysis of the metabolites was used to determine the ratio of metabolites to unmetabolized parent compound and then compared with control samples. Three of the ten compounds affected epoxide hydratase activity. Capsaicin inhibited; whereas, catechin and esculetin enhanced EH activity. Seven of the compounds tested inhibited microsomal mixed‐function oxidase activity. In order of potency, these seven compounds were tannic acid, d‐limonene, capsaicin, ellagic acid, propyl gallate, esculetin and catechin. Since the mutagenic and/or carcinogenic action of many chemicals is dependent upon the metabolic activity of microsomal mixed‐function oxidase and epoxide hydrase, the modulation of this activity by these chemicals provides further evidence in support of their potential chemopreventive properties.