Assay for Mutagenicity of Bile in Sprague-Dawley Rats Treated Subcutaneously With Intestinal Carcinogens

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Abstract
To investigate the mode of action of sc injected intestinal carcinogens, the mutagenicity assay of bile collected from noninbred Sprague-Dawley rats treated sc with carcinogens was conducted in the presence and absence of β-glucuronidase. The bile samples from rats inoculated with 4-aminobiphenyl were mutagenic for Salmonella typhimurium TA100 only in the presence of β-glucuronidase, whereas those from the 3,2′-dimethyl-4-aminobiphenyl-treated rats did not require the enzyme for mutagenicity toward strain TA100. On the contrary, the assays with S. typhimurium G46 and TA100 of bile from rats inoculated with 1,2-dimethylhydrazine, azoxymethane, or methylazoxymethanol acetate failed to reveal mutagenicity whether β-glucuronidase was added or not, though these carcinogens were highly mutagenic for strain G46 in the Salmonella-mlcrosome mutagenicity test and/or in the host-mediated assay.