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. 1986 Feb;83(3):787–791. doi: 10.1073/pnas.83.3.787

Induction of NAD(P)H:quinone reductase in murine hepatoma cells by phenolic antioxidants, azo dyes, and other chemoprotectors: a model system for the study of anticarcinogens.

M J De Long, H J Prochaska, P Talalay
PMCID: PMC322950  PMID: 3080750

Abstract

Exposure of murine hepatoma (Hepa 1c1c7) cells to a variety of chemical agents known to protect animals against the neoplastic, mutagenic, and other toxic effects of chemical carcinogens results in dose- and time-dependent inductions of NAD(P)H:quinone reductase (EC 1.6.99.2). This enzyme protects against quinone toxicity by promoting obligatory two-electron reductions that divert quinones from oxidative cycling or direct interactions with critical nucleophiles. Quinone reductase levels are stable in culture, are easily measured, and are useful markers for the inductive effects of chemoprotective agents. The Hepa 1c1c7 system responds to chemoprotective compounds such as phenolic antioxidants (e.g., BHA [3(2)-tert-butyl-4-hydroxyanisole], BHT (3,5-ditert-butyl-4-hydroxytoluene), and tert-butylhydroquinone), lipophilic azo dyes belonging to the 1,1'-azonaphthalene, Sudan I (1-phenylazo-2-naphthol), and Sudan III [1-(4-phenylazophenylazo)-2-naphthol] families, polycyclic aromatic hydrocarbons, coumarin and various other lactones, flavonoids, and certain sulfur compounds (e.g., benzylisothiocyanate, dithiolthiones, and dithiocarbamates), all of which are recognized enzyme inducers and chemoprotectors in vivo. Quinone reductase induction in Hepa 1c1c7 cells therefore provides a simple, versatile, and reliable system for the evaluation of the potency, kinetics, and mechanism of action of anticarcinogens.

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Selected References

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