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Effect of food supplement mixtures on selected biotransformation enzymes
Kurshakova, Evgeniia ; Dračínská, Helena (advisor) ; Koblihová, Jitka (referee)
Dietary supplements are globally used products designed to complement nutrition with additional nutrients. They contain a wide range of biologically active compounds: amino acids, vitamins, minerals, herbal extracts, etc. Due to the popularity and excessive consumption of food supplements, there is a growing need to research their potential interactions and impact on human health. Certain dietary supplements are metabolized by enzymes from the cytochrome P450 group, which play a key role in the biotransformation of exogenous substrates. Some biologically active compounds may also affect their activity. The presented thesis was focused on studying the influence of several popular components of dietary supplements on cytochromes P450 3A4 and 1A1 expressed in the gastrointestinal tract. The influence of metal ions Zn2+ and Mg2+ , ascorbate from the vitamin group, and curcumin from the polyphenol group was examined. A strong inhibitory effect of curcumin on the activity of both investigated isoforms was confirmed. The reaction of 6β-hydroxylation of testosterone catalyzed by CYP3A4 was significantly suppressed by the addition of curcumin, with the determined IC50 value being 4,7 M. A significant decrease in the rate of resorufin O-deethylation by rat and human CYP1A1 isoforms was also observed (IC50 =...
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