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- W2009772449 abstract "1. Responses of cytochrome P450-dependent ethoxyphenoxazone deethylase (EtOPx'ase) and benzyloxyphenoxazone debenzylase (BzOPx'ase) activities to changes in assay conditions were measured in total microsomal and isolated alveolar type II (tII) cells from rats pretreated with beta-naphthoflavone. 2. Whereas microsomal EtOPx'ase activity was unaffected by storage at -80 degrees C for up to 4 months, BzOPx'ase activity began to decline after only 1 month. 3. The microsomal and type II activities were unaffected by changes in pH (7.2-8.0) or salt content. 4. The type II activities increased after sonication 2.3-2.7-fold or in the presence of 10 microM dicumarol 1.7-1.9-fold. 5. Type II BzOPx'ase was sensitive to metyrapone (MP) whereas EtOPx'ase was sensitive to alpha-naphthoflavone (ANF). I50 values for the tII activities were calculated as: 0.63 microM--MP (BzOPx'ase), 80 microM--MP (EtOPx'ase), 0.024 microM--ANF (EtOPx'ase). At the highest concentration of ANF (10 microM), 50% inhibition tII BzOPx'ase was not observed. The results were similar to those obtained with the total lung microsomal fraction. 6. Microsomal and tII BzOPx'ase activities exhibited non-linear dependence at low enzyme concentration. Linearity was restored by 0.5 mM dimyristoylphosphatidylcholine." @default.
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- W2009772449 title "Lung cytochrome P450-dependent benzyloxyphenoxazone debenzylase and ethoxyphenoxazone deethylase activities in total microsomal and isolated alveolar type II cells: Responses to changes in assay conditions with special reference to non-linear dependence at low enzyme concentration" @default.
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- W2009772449 doi "https://doi.org/10.1016/0020-711x(90)90180-b" @default.
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