Reductase enzyme expression across the National Cancer Institute Tumor cell line panel: correlation with sensitivity to mitomycin C and EO9

Journal of the National Cancer Institute
S A FitzsimmonsA D Lewis

Abstract

Many antitumor drugs require metabolic activation to exert their cytotoxic or cytostatic effects. The so-called bioreductive compounds, whose conversion into active antitumor agents is catalyzed by reductase enzymes, are examples of such drugs. The identification of specific enzymes involved in the activation of these compounds is important in understanding cellular factors that may influence drug antitumor activity. We measured expression levels of three different reductase enzymes-DT-diaphorase [NAD(P)H (i.e., reduced nicotinamide adenine dinucleotide, with or without phosphate): quinone oxidoreductase]; NADPH:cytochrome P-450 reductase; and NADH (i.e., reduced nicotinamide adenine dinucleotide): cytochrome-b5 reductase- in 69 cell lines (most of the National Cancer Institute [NCI] human tumor cell panel) to see if relationships could be established between the activities of these enzymes and cellular sensitivities to the bioreductive compounds mitomycin C and EO9. For all 69 cell lines, the activity of each enzyme was determined using cellular extracts and photometric assays involving the reduction of cytochrome c. Western blot analysis was used to measure the relative amount of DT-diaphorase protein in each extract, and cou...Continue Reading

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