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Alcohol and Cancer pp 15–35Cite as

Roles of Cytochrome P450 in Metabolism of Ethanol and Carcinogens

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Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1032))

Abstract

Cytochrome P450 (P450) enzymes are involved in the metabolism of carcinogens, as well as drugs, steroids, vitamins, and other classes of chemicals. P450s also oxidize ethanol, in particular P450 2E1. P450 2E1 oxidizes ethanol to acetaldehyde and then to acetic acid, roles also played by alcohol and aldehyde dehydrogenases. The role of P450 2E1 in cancer is complex in that P450 2E1 is also induced by ethanol, P450 2E1 is involved in the bioactivation and detoxication of a number of chemical carcinogens, and ethanol is an inhibitor of P450 2E1. Contrary to some literature, P450 2E1 expression and induction itself does not cause global oxidative stress in vivo, as demonstrated in studies using isoniazid treatment and gene deletion studies with rats and mice. However, a major fraction of P450 2E1 is localized in liver mitochondria instead of the endoplasmic reticulum, and studies with site-directed rat P450 2E1 mutants and natural human P450 2E1 N-terminal variants have shown that P450 2E1 localized in mitochondria is catalytically active and more proficient in producing reactive oxygen species and damage. The role of the mitochondrial oxidative stress in ethanol toxicity is still under investigation, as is the mechanism of altered electron transport to P450s that localize inside mitochondria instead of their typical endoplasmic reticulum environment.

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Authors and Affiliations

  1. Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee, USA

    F. Peter Guengerich

  2. Department of Biomedical Sciences, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA, USA

    Narayan G. Avadhani

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  1. F. Peter Guengerich
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Correspondence to F. Peter Guengerich .

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  1. Department of Environmental Health Sciences, Yale School of Public Health, Yale University, New Haven, CT, USA

    Vasilis Vasiliou

  2. Distilled Spirits Council of the US, Washington, DC, USA

    Samir Zakhari

  3. Mishra Laboratory, University of Texas, MD Anderson Cancer Center, Houston, TX, USA

    Lopa Mishra

  4. Salem Medical Centre, University of Heidelberg, Heidelberg, Baden-Württemberg, Germany

    Helmut K. Seitz

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Peter Guengerich, F., Avadhani, N.G. (2018). Roles of Cytochrome P450 in Metabolism of Ethanol and Carcinogens. In: Vasiliou, V., Zakhari, S., Mishra, L., Seitz, H. (eds) Alcohol and Cancer. Advances in Experimental Medicine and Biology, vol 1032. Springer, Cham. https://doi.org/10.1007/978-3-319-98788-0_2

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