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• W1520382834 endingPage "341" @default.
• W1520382834 startingPage "307" @default.
• W1520382834 abstract "Enzymes of xenobiotic metabolism are involved in the activation and detoxification of carcinogens and can play a pivotal role in the susceptibility of individuals toward chemically induced cancer. Differences in such susceptibility are often related to genetically predetermined enzyme polymorphisms but may also be caused by enzyme induction or inhibition through environmental factors or in the frame of chemopreventive intervention. In this context, coffee consumption, as an important lifestyle factor, has been under thorough investigation. Whereas the data on a potential procarcinogenic effect in some organs remained inconclusive, epidemiology has clearly revealed coffee drinkers to be at a lower risk of developing cancers of the colon and the liver and possibly of several other organs. The underlying mechanisms of such chemoprotection, modifications of xenobiotic metabolism in particular, were further investigated in rodent and in vitro models, as a result of which several individual chemoprotectants out of the >1000 constituents of coffee were identified as well as some strongly metabolized individual carcinogens against which they specifically protected. This chapter discusses the chemoprotective effects of several coffee components and whole coffee in association with modifications of the usually protective glutathione‐S‐transferase (GST) and the more ambivalent N‐acetyltransferase (NAT). A key role is played by kahweol and cafestol (K/C), two diterpenic constituents of the unfiltered beverage that were found to reduce mutagenesis/tumorigenesis by strongly metabolized compounds, such as 2‐amino‐1‐methyl‐6‐phenylimidazo‐[4,5‐b]pyridine, 7,12‐dimethylbenz[a]anthracene, and aflatoxin B1, and to cause various modifications of xenobiotic metabolism that were overwhelmingly beneficial, including induction of GST and inhibition of NAT. Other coffee components such as polyphenols and K/C‐free coffee are also capable of increasing GST and partially of inhibiting NAT, although to a somewhat lesser extent." @default.
• W1520382834 created "2016-06-24" @default.
• W1520382834 creator A5000310922 @default.
• W1520382834 creator A5012217277 @default.
• W1520382834 date "2005-01-01" @default.
• W1520382834 modified "2023-09-23" @default.
• W1520382834 title "Modification of N‐Acetyltransferases and Glutathione S‐Transferases by Coffee Components: Possible Relevance for Cancer Risk" @default.
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