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- W2130937946 abstract "We previously reported that the proportion of large-size micronuclei (MN) can be a reliable parameter to discriminate aneugens from clastogens in the in vitro MN assay using Chinese hamster lung cells. The frequencies of polynuclear (PN) and mitotic (M) cells are also supposed to be useful parameters for the same purpose since they are known to be increased by aneugens. In the present study, we investigated whether morphological observations of the cell nucleus can be applied for the in vitro MN assay using the p53-competent human lymphoblastoid cell line, TK6 cells. Our present MN assay with six clastogens and six aneugens revealed that the frequencies of large-size MN or PN cells cannot distinguish aneugens from clastogens, while the frequencies of M cells can distinguish them, suggesting that the M-cell frequency is a recommended parameter to determine a mode of action for MN induction in the in vitro MN assay using TK6 cells. Our further investigation using p53-null mutant NH32 cells showed that the frequencies of large-size MN or PN cells induced by aneugen treatments were higher than those in TK6 cells but not by clastogen treatments. These findings suggest that p53 abrogation promotes the susceptibility for morphological changes in the nucleus to aneugens and that morphological observation of the cell nucleus including size-classifying MN counting could distinguish aneugens from clastogens in the MN assay using NH32 cells." @default.
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- W2130937946 date "2011-10-31" @default.
- W2130937946 modified "2023-10-05" @default.
- W2130937946 title "Difference in susceptibility to morphological changes in the nucleus to aneugens between p53-competent and p53-abrogated lymphoblastoid cell lines (TK6 and NH32 cells) in the in vitro micronucleus assay" @default.
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- W2130937946 doi "https://doi.org/10.1093/mutage/ger074" @default.
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