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- W2008245763 abstract "Effects of chronic administration of 2-amino-3,8-dimethylimidazo[4,S-f]quinoxaline (MeIQx) at the very low doses of 0.4 and 4 ppm, respectively 1000- and 100-fold less than the dose shown to be carcinogenic (400 ppm), on the liver of rats fed a choline-deficient (CD) diet were examined in terms of glutathione S-transferase placental form (GST-P)-positive foci. Male F344 rats were given CD diet containing 0, 0.4 or 4 ppm MeIQx for 20 or 40 weeks. As controls, rats received choline-supplemented (CS) diet in the same manner. MeIQx at 4 ppm in the CD diet significantly increased both the number and area of GST-P-positive foci, the values being 2.3- and 2.1-fold at 20 weeks and 2.0- and 3.3-fold at 40 weeks, respectively, compared with those observed for CD diet alone. MeIQx at 0.4 ppm in CD diet did not affect the development of GST-P-positive foci. No influence of the heterocyclic amine was found in the CS groups, where only very small numbers of minute lesions were observed. The level of MeIQx-DNA adducts in rats given the CD diet containing 4 ppm MeIQx was 2- to 3-fold lower than that in rats given the CS diet containing 4 ppm MeIQx at 20 and 40 weeks. This result indicates that DNA adduct formation and cell proliferation are both required for the increase of GST-P-positive foci in rats fed 4 ppm MeIQx in a CD diet. The above findings strongly suggest that MeIQx could be carcinogenic even at 4 ppm under CD conditions, where liver cell regeneration is continuously occurring." @default.
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- W2008245763 title "Effects of Chronic Administration of Low Doses of 2-Ammo-3,8-dimethylimidazo-[4,5-f]qumoxaline on Glutathione S-Transferase Placental Form-positive Foci Development in the Livers of Rats Fed a Choline-deficient Diet" @default.
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- W2008245763 doi "https://doi.org/10.1111/j.1349-7006.1993.tb02058.x" @default.
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