Abstract
Many natural dietary phytochemicals found compounds found in fruits, vegetables, spices and tea have been shown in recent years to be protective against cancer in various animal models. In the light of the potential impact of these compounds on human health it is important to elucidate the mechanisms involved. We therefore developed and characterized relevant in vitro models using immortalized human epithelial cell lines derived from target tissues in carcinogenesis, such as lung, liver and colon. Assays were established, allowing the evaluation of the cytotoxic and genotoxic effects of various procarcinogens, including nitrosamines, mycotoxins and heterocyclic amines on these metabolically-competent human epithelial cell lines. These cellular models appeared to be a useful tool to study the capacity of certain food components to block the initiation stage of carcinogenesis. The ability of carnosol and carnosic acid from rosemary as well as the synthetic dithiolethione, oltipraz, to block the formation of DNA adducts, and their effects on the expression of phase I and phase II enzymes was investigated. We have observed that both rosemary extracts and oltipraz inhibited benzo(a)pyrene- or aflatoxin B,-induced DNA adduct formation by strongly inhibiting CYP45° activities and inducing the expression of glutathione S-transferase. These results in human cell models give some insight into the different mechanisms involved in the chemopreventive action of both natural and synthetic compounds in relation to phase I and phase II enzymes.
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Macé, K., Offord, E.A., Harris, C.C., Pfeifer, A.M.A. (1998). Development of In Vitro Models for Cellular and Molecular Studies in Toxicology and Chemoprevention. In: Seiler, J.P., Autrup, J.L., Autrup, H. (eds) Diversification in Toxicology — Man and Environment. Archives of Toxicology, vol 20. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-46856-8_20
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DOI: https://doi.org/10.1007/978-3-642-46856-8_20
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