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• W2080781360 abstract "In a Namru mouse liver epithelial cell strain designated NMuLi, aryl hydrocarbon hydroxylase (AHH) activity peaked at 12 h post-induction with 1 microgram/ml of benzo(a)pyrene (BaP) in both confluent and growing cells. Maximal levels of AHH activity were reached on day two post-plating. This induced activity was inhibited in vitro 78% by gassing the incubation mixture with carbon monoxide for 15 s, and inhibited 93% by addition of 40 microgram/ml of 7,8 benzoflavone(BF). Induced AHH levels were higher in epithelial clones that were sensitive to the toxicity of BaP than in resistant clones. The survival fraction of clones from NMuLi and of subclones derived from a sensitive clone of NMuLi after BaP treatment was a negative exponential function of the maximal induced AHH activity in the clones. One of the clones, NMuLi cl 8, was extremely susceptible to the toxic effects of BaP, the +/-(trans)-7alpha, 8beta-dihydroxy-7,8-dihydro-BaP(7,8-diol), and the (+/-)-7alpha, 8beta-dihydroxy-9beta, 10beta-epoxy-7,8,9,10-tetrahydro-BaP (diol-epoxide), known metabolites of BaP. The toxicity of BaP and the 7,8 diol to this clone was inhibited by BF, suggesting that these cells possessed an enzyme activity inhibitable by BF that could epoxidize BaP to the 7,8 oxide and then epoxidize the resultant 7,8 diol to the diol-epoxide. Another clone derived from NMuLi, clone 7, was relatively resistant to the toxic effects of BaP and the 7,8-diol, but still extremely susceptible to the toxic effects of the diol-epoxide. The slight toxicity to BaP in this clone was inhibited by BF, but the toxicity of the 7,8-diol to this clone was not inhibited by BF. A typical cytochrome P450 inhibitor, metyrapone, had no effect on the toxicity of BaP, the 7,8-diol, or the diol-epoxide to either clone 7 or clone 8. The results suggest that these liver cells possess two enzymes that play some role in polycyclic hydrocarbon-induced toxicity. Enzyme A, a BaP-inducible enzyme that is inhibitable by BF, efficiently metabolizes BaP to the 7,8-diol and the 7,8-diol to the diol-epoxide. It is responsible for most of the hydrocarbon toxicity. Enzyme B is not inhibitable by BF and metabolizes the 7,8-diol less efficiently to the diol-epoxide or efficiently to other, less toxic products." @default.
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• W2080781360 date "1978-12-01" @default.
• W2080781360 modified "2023-10-17" @default.
• W2080781360 title "Biochemical basis for the acquisition of resistance to benzo[a]pyrene in clones of mouse liver cells in culture" @default.
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• W2080781360 doi "https://doi.org/10.1016/0009-2797(78)90094-7" @default.
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