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• W2021102643 abstract "Interaction of ebselen, an anti-inflammatory compound of low toxicity, with rat liver cytochrome P-450 is used as a model system to quantify possible interactions of seleno-organic compounds with sulfhydryl groups of intracellular membrane-bound proteins. Ebselen induces a unique difference spectrum (maximum at 405 nm, minima at 385 and 425 nm) after addition to microsomes under in vitro conditions. This spectrum indicates an interaction with the thiolate anion at cytochrome P-450; it can be blocked by previous addition of dithioerythritol. With uninduced microsomes, addition of ebselen converts maximally 50% of the cytochrome P-450 to P-420 in a time-dependent (nearly complete effect within 10 min) and concentration-dependent manner (halfmaximal effect with 50 μM at 1 nmolml cytochrome P-450 concentration) in vitro. In phenobarbital- and 3-methylcholanthrene-induced microsomes, 73% and 64%, respectively, of cytochrome P-450 are converted to P-420 in presence of 200 μM ebselen. It is assumed that only certain isoenzymes of the total hepatic cytochrome P-450 are accessible to ebselen. Bovine serum albumin at physiological concentrations and sulfhydryl compounds such as dithioerythritol are effective in preventing this cytochrome P-450 inactivation by ebselen. Specificity studies reveal that variation of the N-substituent in the benzisoselenazolone system does not influence cytochrome P-450 inactivation, whereas ebselen derivatives with methylated or glucuronidated selenium moiety as well as diselenides do not convert cytochrome P-450 to P-420. It is concluded that benzisoselenazolones are able to interact with sulfhydryl groups of membrane-associated proteins in vitro." @default.
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• W2021102643 date "1989-02-01" @default.
• W2021102643 modified "2023-09-26" @default.
• W2021102643 title "Optical spectral studies of ebselen interaction with cytochrome P-450 of rat liver microsomes" @default.
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• W2021102643 doi "https://doi.org/10.1016/0006-2952(89)90207-4" @default.
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