title: Genetic effects of procarbazine in the yeast Saccharomyces cerevisiae, strain D4.
abstract: Procarbazine ( PCZ ) was tested for its ability to induce mitotic gene conversions at the ade and trp loci of Saccharomyces cerevisiae, strain D4. The influence of the following factors was examined: growth phase of the yeast cells (log vs stationary phase), pH of the treatment solution, and addition of mouse S9 fractions prepared from different organs. The drug was found more toxic and mutagenic at low doses (up to 25 mg/ml) for log phase cells, and scarcely toxic but highly mutagenic, even at high doses, for stationary phase cells. PCZ activity was reduced by acidic pH, and suppressed by S9 mix. Gene conversions were also analyzed in the intrasanguineous host-mediated assay performed in mice orally administered with PCZ . In such conditions PCZ was ineffective in stimulating mitotic gene conversions, probably owing to its inactivation in the acidic environment of the gastroenteric tract.
mesh_terms: D000818:Animals; D001711:Biotransformation; D004260:DNA Repair; D004128:Dimethylnitrosamine / Q000633:toxicity; D005800:Genes, Fungal / Q000187:drug effects; D007668:Kidney / Q000378:metabolism; D008168:Lung / Q000378:metabolism; D008297:Male; D008769:Methylnitronitrosoguanidine / Q000633:toxicity; D051379:Mice; D008861:Microsomes / Q000378:metabolism; D008862:Microsomes, Liver / Q000378:metabolism; D009152:Mutagenicity Tests; D011344:Procarbazine / Q000633:toxicity*; D012441:Saccharomyces cerevisiae / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development
chemical_list: D008769:Methylnitronitrosoguanidine; D011344:Procarbazine; D004128:Dimethylnitrosamine