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Bioreductive activation of quinones: A mixed blessing

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Abstract

Quinones can be metabolized by various routes: substitution or reductive addition with nucleophilic compounds (mainly glutathione and protein thiol groups), one-electron reduction (mainly by NADPH: cytochrome P-450 reductase) and two-electron reduction (by D,T-diaphorase). During reduction semiquinone radicals and hydroquinones are formed, which can transfer electrons to molecular oxygen, resulting in the formation of reactive oxygen intermediates and back-formation of the parent quinone (redox cycling). Reaction of semiquinones and reactive oxygen intermediates with DNA and other macromolecules can lead to acute cytotoxicity and/or to mutagenicity and carcinogenicity. The enhanced DNA-alkylating properties of certain hydroquinones are exploited in the bioreductive alkylating quinones. Acute cytotoxicity of quinones appears to be related to glutathione depletion and to interaction with mitochondria and subsequent disturbance of cellular energy homoeostasis and calcium homoeostasis. These effects can to a certain extent be predicted from the electron-withdrawing and electron-donating effects of the substituents on the quinone nucleus of the molecule. Prediction of cytostatic potential remains much more complicated, because reduction of the quinones and the reactivity of the reduction products with DNA are modulated by the prevailing oxygen tension and by the prevalence of reducing enzymes in tumour cells.

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Authors and Affiliations

  1. Department of Pharmacology, Faculty of Pharmacy, Utrecht University, P.O. Box 80.082, 3508, TB Utrecht, the Netherlands

    Andries S. Koster

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  1. Andries S. Koster
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This article is based on a lecture given at the 16th LOF Symposium, 27 October 1989, Utrecht, the Netherlands.

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Koster, A.S. Bioreductive activation of quinones: A mixed blessing. Pharmaceutisch Weekblad Scientific Edition 13, 123–126 (1991). https://doi.org/10.1007/BF01981528

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