Mutant Frequency is not Increased in Mice Orally Exposed to Sodium Dichromate

Yasunobu Aoki, Michiyo Matsumoto, Michi Matsumoto, Kenichi Masumura, Takehiko Nohmi
2019 Food Safety  
The in vivo mutagenicity of hexavalent chromium in the small intestine, the target organ of tumorgenicity, was examined by means of a transgenic mouse gene mutation assay. Sodium dichromate dihydrate was administered orally in drinking water to male gpt delta mice at a dose of 85.7 or 257.4 mg/L for 28 days or at a dose of 8.6, 28.6 or 85.7 mg/L for 90 days. No significant increase in gpt mutant frequency relative to that in control mice was observed in the small intestine in either the 28- or
more » ... 0-day study, whereas 28-day oral administration of potassium bromate, a positive control substance, increased mutant frequency.
doi:10.14252/foodsafetyfscj.2018014 pmid:31998582 pmcid:PMC6977768 fatcat:k6ok7k6ndjgqzhdbbwsduo7tle