The toxicity of menadione and mitozantrone in human liver-derived Hep G2 hepatoma cells

S J Duthie, M H Grant

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    The cytotoxic properties of quinone drugs such as menadione and adriamycin are thought to be mediated through one-electron reduction to semiquinone free radicals. Redox cycling of the semiquinones results in the generation of reactive oxygen species and in oxidative damage. In this study the toxicity of mitozantrone, a novel quinone anticancer drug, was compared with that of menadione in human Hep G2 hepatoma cells. Mitozantrone toxicity in these cells was not mediated by the one-electron reduction pathway. In support of this, inhibition of the enzymes glutathione reductase and catalase, responsible for protecting the cells from oxidative damage, did not affect the response of the Hep G2 cells to mitozantrone, whereas it exacerbated menadione toxicity. In addition, the toxicity of menadione was preceded by depletion of reduced glutathione which was probably due to oxidation of the glutathione. Mitozantrone did not cause glutathione depletion prior to cell death. DT-diaphorase activity and intracellular glutathione were found to protect the cells from the toxicity of both quinones. Inhibition of epoxide hydrolase potentiated mitozantrone toxicity but did not affect that of menadione. Our experiments indicate that mitozantrone toxicity may involve activation to an epoxide intermediate. Both quinone drugs inhibited cytochrome P-450-dependent mixed-function oxidase activity, although menadione was more potent in this respect.
    Original languageEnglish
    Pages (from-to)1247-55
    Number of pages9
    JournalBiochemical Pharmacology
    Volume38
    Issue number8
    Publication statusPublished - 1989

    Fingerprint

    Vitamin K 3
    Mitoxantrone
    Hep G2 Cells
    Liver
    Toxicity
    Hepatocellular Carcinoma
    Glutathione
    Pharmaceutical Preparations
    Electrons
    NAD(P)H Dehydrogenase (Quinone)
    Epoxide Hydrolases
    Quinones
    Glutathione Reductase
    Epoxy Compounds
    Mixed Function Oxygenases
    Catalase
    Doxorubicin
    Cytochrome P-450 Enzyme System
    Cell death
    Oxidation-Reduction

    Keywords

    • Adult
    • Biotransformation
    • Carcinoma, Hepatocellular
    • Cell Survival
    • Epoxide Hydrolases
    • Glutathione
    • Glutathione Transferase
    • Humans
    • Liver Neoplasms
    • Metabolic Detoxication, Drug
    • Mitoxantrone
    • Oxidation-Reduction
    • Oxidoreductases
    • Tumor Cells, Cultured
    • Vitamin K

    Cite this

    The toxicity of menadione and mitozantrone in human liver-derived Hep G2 hepatoma cells. / Duthie, S J; Grant, M H.

    In: Biochemical Pharmacology, Vol. 38, No. 8, 1989, p. 1247-55.

    Research output: Contribution to journalArticle

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    abstract = "The cytotoxic properties of quinone drugs such as menadione and adriamycin are thought to be mediated through one-electron reduction to semiquinone free radicals. Redox cycling of the semiquinones results in the generation of reactive oxygen species and in oxidative damage. In this study the toxicity of mitozantrone, a novel quinone anticancer drug, was compared with that of menadione in human Hep G2 hepatoma cells. Mitozantrone toxicity in these cells was not mediated by the one-electron reduction pathway. In support of this, inhibition of the enzymes glutathione reductase and catalase, responsible for protecting the cells from oxidative damage, did not affect the response of the Hep G2 cells to mitozantrone, whereas it exacerbated menadione toxicity. In addition, the toxicity of menadione was preceded by depletion of reduced glutathione which was probably due to oxidation of the glutathione. Mitozantrone did not cause glutathione depletion prior to cell death. DT-diaphorase activity and intracellular glutathione were found to protect the cells from the toxicity of both quinones. Inhibition of epoxide hydrolase potentiated mitozantrone toxicity but did not affect that of menadione. Our experiments indicate that mitozantrone toxicity may involve activation to an epoxide intermediate. Both quinone drugs inhibited cytochrome P-450-dependent mixed-function oxidase activity, although menadione was more potent in this respect.",
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    N2 - The cytotoxic properties of quinone drugs such as menadione and adriamycin are thought to be mediated through one-electron reduction to semiquinone free radicals. Redox cycling of the semiquinones results in the generation of reactive oxygen species and in oxidative damage. In this study the toxicity of mitozantrone, a novel quinone anticancer drug, was compared with that of menadione in human Hep G2 hepatoma cells. Mitozantrone toxicity in these cells was not mediated by the one-electron reduction pathway. In support of this, inhibition of the enzymes glutathione reductase and catalase, responsible for protecting the cells from oxidative damage, did not affect the response of the Hep G2 cells to mitozantrone, whereas it exacerbated menadione toxicity. In addition, the toxicity of menadione was preceded by depletion of reduced glutathione which was probably due to oxidation of the glutathione. Mitozantrone did not cause glutathione depletion prior to cell death. DT-diaphorase activity and intracellular glutathione were found to protect the cells from the toxicity of both quinones. Inhibition of epoxide hydrolase potentiated mitozantrone toxicity but did not affect that of menadione. Our experiments indicate that mitozantrone toxicity may involve activation to an epoxide intermediate. Both quinone drugs inhibited cytochrome P-450-dependent mixed-function oxidase activity, although menadione was more potent in this respect.

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