NADPH cytochrome P-450 reductase activation of quinone anticancer agents to free radicals.
Article Details
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Bachur NR, Gordon SL, Gee MV, Kon H
NADPH cytochrome P-450 reductase activation of quinone anticancer agents to free radicals.
Proc Natl Acad Sci U S A. 1979 Feb;76(2):954-7.
- PubMed ID
- 34156 [ View in PubMed]
- Abstract
With NADPH as the electron donor, rat liver NADPH cytochrome P-450 reductase (NADPH:ferricytochrome oxidoreductase, EC 1.6.2.4) catalyzes the single-electron reduction of several quinone antibiotics to a semiquinone or free radical state. The benzanthraquinones adriamycin, daunorubicin, carminomycin, 7-O-methylnogalarol, and aclacinomycin A and the N-heterocyclic quinones streptonigrin and mitomycin C are activated to free radical intermediates which can transfer their single electron to molecular oxygen to form superoxide. The overall Km range for this electron transfer is 0.4 to 42.1 X 10(-4) M. We postulate that the formation of the "site-specific free radical/ intermediate is central to the cytotoxic action of these antibiotics.
DrugBank Data that Cites this Article
- Drug Enzymes
Drug Enzyme Kind Organism Pharmacological Action Actions Daunorubicin NADPH--cytochrome P450 reductase Protein Humans UnknownSubstrateInducerDetails