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- W2042594920 abstract "Rat-liver S9 preparations became highly mutagenic to cultured L5178Y mouse lymphoma cells when the exposure period was increased to 18-24 h or when S9 mix was preincubated in Fischer's medium at 37 degrees C for 19 h and then used to treat the cells for 4 h. Five different S9 preparations (from untreated and Aroclor 1254-treated Fischer 344 or Sprague-Dawley male rats) behaved similarly. S9 mix, which contained 1 mM NADP and 5 mM isocitrate as cofactors, was more mutagenic than S9 alone. Heat treatment of S9 did not destroy its mutagenic activity, but the addition of cofactors no longer stimulated an increase in mutagenicity, as observed with native S9. Treatment with cofactors was not mutagenic. These results implied the involvement of both energy-independent and NADPH-dependent enzymatic changes in S9 mix in producing mutagenic substances. The mutagenic treatments with S9 or S9 mix induced predominantly small TFT-resistant mutant colonies, which suggested that these treatments should be clastogenic to cultured mammalian cells. A warning was given that test chemicals evaluated as mutagenic only in the presence of S9 mix may instead be accelerating the decomposition of S9 mix into mutagens, and it may become necessary to experimentally distinguish between these two mechanisms before a chemical can be regarded as mutagenic." @default.
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- W2042594920 date "1987-09-01" @default.
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- W2042594920 title "Mutagenicity of rat-liver S9 to L5178Y mouse lymphoma cells" @default.
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- W2042594920 doi "https://doi.org/10.1016/0165-1218(87)90030-9" @default.
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