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- W2026109721 abstract "The microflora of the human colon is a complex ecosystem of anaerobic bacteria which have the capability of enzymatically transforming a variety of dietary (or biliary) compounds to genotoxic metabolites. In the past, most investigators studying the interplay between diet and colonic flora and its role in the etiology of cancers focused on the reductive and glycosidic potential of the bacterial enzymes— many of which reverse the oxidative and conjugative reactions performed by the liver. Recent work in our laboratory has focused on the metabolism of two relatively new classes of genotoxins, the fecapentaenes and the heterocyclic amines (pyrolysis carcinogens). The fecapentaenes (conjugated ether lipids) are produced in the colon by Bacteroides spp. from polyunsaturated ether phospholipids (plasmalogens) whose natural origin and function are unknown. The fecapentaenes are potent direct-acting genotoxins that are detected in the feces of most individuals on normal western diets. The heterocyclic amines, which originate from fried or broiled proteinaceous foods, normally require activation by the liver before being potent mutagens or carcinogens. However, the “IQ” subclass (e.g. IQ and MeIQ) can be activated in the colon by Eubacterium and Clostridium species to a 7-hydroxy form which is directly mutagenic in Salmonella. Although there is no direct evidence that the fecapentaenes or the 7-hydroxy “IQ” compounds influence risk for colon cancer, the potency and prevalence of these bacterial metabolites is cause for concern." @default.
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- W2026109721 date "1990-05-01" @default.
- W2026109721 modified "2023-10-18" @default.
- W2026109721 title "Metabolism of dietary genotoxins by the human colonic microflora; the fecapentaenes and heterocyclic amines" @default.
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- W2026109721 doi "https://doi.org/10.1016/0165-1110(90)90013-2" @default.
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