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- W1987377212 abstract "The liver carcinogen phenobarbital (PB) causes a weak but reproducible increase of the mutant frequency in the Ames test, strain TA1535, without S9. Since there is no obvious chemical basis for a “DNA reactivity” of this compound experiments were performed to obtain information about possible indirect mechanisms of enhancing the number of spontaneous mutant colonies. In the course of the study strong synergistic and comutagenic effects of PB when given in combination with Na-azide or 2-aminoanthracene (2AA) were observed. Not only TA1535 but the complete set of tester strains was responsive. However, PB did not enhance the effects of other mutagens such as 4-nitroquinoline N-oxide or 2-nitrofluorene. It is argued that in strain TA1535 the fixation and expression of spontaneously occurring DNA lesions is amenable to modulation by PB similar to that of Na-azide or 2AA induced lesions. Thus in the usual sense, PB is not genotoxic in the Ames test. Methapyrilene, another liver carcinogen with an assumed non-genotoxic mode of action, showed almost identical properties in these experiments." @default.
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- W1987377212 date "1992-01-01" @default.
- W1987377212 modified "2023-10-18" @default.
- W1987377212 title "Phenobarbital: Does the positive result in TA1535 indicate genotoxic properties?" @default.
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- W1987377212 doi "https://doi.org/10.1002/em.2850190211" @default.
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