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- W2000250623 abstract "The role of cytochrome P-450 in the stimulation of lipid peroxidation by the nephrotoxic mycotoxin ochratoxin A has been investigated. Ochratoxin A was previously shown to markedly stimulate lipid peroxidation in a reconstituted system consisting of phospholipid vesicles, NADPH-cytochrome P-450 reductase, Fe3+, ethylenediaminetetraacetic acid (EDTA), and reduced nicotinamide adenine dinucleotide phosphate (NADPH). We now show that purified cytochrome P-450IIB1 could effectively replace EDTA in stimulating lipid peroxidation suggesting that it could mediate the transfer of electrons from NADPH to Fe3+. Cobalt protoporphyrin is known to cause an extensive and long-lasting depletion of hepatic cytochrome P-450 in rats, and it has been used to evaluate the role of hepatic cytochrome P-450 in xenobiotic metabolism and toxicity. We have observed that microsomes isolated from livers of cobalt protoporphyrin-pretreated rats underwent ochratoxin A-dependent lipid peroxidation much more slowly than control microsomes. Also, the level of ethane exhaled (an index of in vivo lipid peroxidation) on ochratoxin A administration was much lower in cobalt protoporphyrin-pretreated rats than in control rats. Taken together, these results provide evidence for the stimulatory role of cytochrome P-450 in ochratoxin A-induced lipid peroxidation in a reconstituted system and strongly implicate its role in microsomal and in vivo ochratoxin A-induced lipid peroxidation." @default.
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- W2000250623 date "1991-01-01" @default.
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- W2000250623 title "Role of cytochrome P-450 in ochratoxin a-stimulated lipid peroxidation" @default.
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- W2000250623 doi "https://doi.org/10.1002/jbt.2570060306" @default.
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