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- W1479756876 abstract "Radical production from 3,5-bis(ethoxycarbonyl)-4-ethyl-2,6-dimethyl-1,4- dihydropyridine (DDEP) in rat liver microsomes has been attributed to one-electron oxidation via cytochrome P-450 followed by extrusion of an ethyl radical. In the presence of the spin trap alpha-(4-pyridyl 1-oxide)-N-tert-butylnitrone (4-POBN), this radical was detected as the 4-POBN/ethyl radical adduct by electron paramagnetic resonance spectroscopy. The addition of catalase resulted in over a 50% decrease in radical production. The concentration of the 4-POBN/ethyl radical adduct increased about 9-fold in the presence of EDTA and approximately 2-fold in the presence of either diethylenetriaminepentaacetic acid (DTPA) or deferoxamine mesylate. When DDEP was incubated with deferoxamine mesylate-washed microsomes and NADPH in Chelex-treated incubation buffer, much less 4-POBN/ethyl radical formation occurred. Addition of either DTPA, EDTA, or the ferric complexes of these chelators greatly stimulated production of the 4-POBN/ethyl radical adduct in this system. These results suggest that the ethyl radicals produced from DDEP in a microsomal system arise via trace transition metal-catalyzed reactions." @default.
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- W1479756876 date "1990-07-01" @default.
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- W1479756876 title "A reexamination of the cytochrome P-450-catalyzed free radical production from a dihydropyridine. Evidence of trace transition metal catalysis." @default.
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- W1479756876 doi "https://doi.org/10.1016/s0021-9258(19)38414-5" @default.
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