Abstract
ICR 170 and ICR 191, but not 9-aminoacridine or chloroquine, induced both 6-thioguanine- and, to a smaller extent, ouabain-resistance in Chinese hamster V79 cells. These results indicate that covalent binding to DNA is necessary for intercalating agents to induce mutation in this cell line, and that this assay can distinguish potential carcinogens from non-carcinogenic analogues of this chemical type. The induction of ouabain-resistance by both ICR 170 and ICR 191 indicates that these frameshift mutagens induce base-pair substitution to some extent in V79 cells.
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