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• W2006229722 abstract "Specific characteristics of cells vary as a function of time in culture. We have determined the stability of selected Phase I and Phase II biotransformation capacities in rabbit renal proximal tubule cells in primary culture. When grown in hormonally-defined medium, proximal tubule cells lost Phase I metabolic capacity. Cytochrome P-450 content and associated mixed-function oxidase activities present in kidney cortex microsomes were not detectable after 14 days in culture. Phase II glutathione-dependent metabolic functions were well retained in cultured cells compared with freshly isolated proximal tubules (FIPT). Cellular total glutathione content was 2.8 mug/mg protein in FIPT compared with approximately 10 mug/mg protein in stable confluent cultures. A higher total glutathione content of 20.6 mug/mg was noted in preconfluent cultures. The glutathione redox state was initially perturbed in FIPT with 37% of the total glutathione present found in its oxidized form. Tubule cells recovered to a normal ratio (6-13% of total glutathione in the oxidized form) while in culture. The glutathione S-transferase activity in 4-day-old cells in culture was reduced to 50% of the 4 U/mg protein level found in FIPT. No appreciable further decline in glutathione S-transferase activity was detected during 15 days in culture. The level of gamma-glutamyl-transpeptidase (a brush-border enzyme necessary for glutathione uptake into proximal tubule cells) declined from 1499 mU/mg protein in homogenates of FIPT to 636 mU/mg in homogenates of 8-day-old cultured cells. A further decline in activity occurred during the next 7 days in culture. In conclusion, although Phase I metabolic functions were diminished in primary cultured rabbit proximal tubule cells, Phase II metabolic functions were retained at levels comparable with FIPT and well above those found in several established kidney cell lines." @default.
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• W2006229722 date "1990-01-01" @default.
• W2006229722 modified "2023-09-27" @default.
• W2006229722 title "Primary cultures of rabbit renal proximal tubule cells: II. Selected phase I and phase II metabolic capacities" @default.
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• W2006229722 doi "https://doi.org/10.1016/0887-2333(90)90041-q" @default.
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