Abstract
Lactitol (NS-4), a hepatic encephalopathy drug, was examined for mutagenicity in the reverse mutation test in bacteria, the chromosome aberration test with cultured mammalian cells, and the micronucleus test in mice. 1. In the reverse mutation test using Salmonella typhimurium (TA1535, TA100, TA1537, and TA98) and Escherichia coli (WP2uvrA), the drug did not significantly increase revertant colonies in any of the test strains with or without metabolic activation system (S-9mix). 2. In the chromosome aberration test with cultured Chinese hamster lung cells (CHL/IU), the drug did not significantly increase aberrant cells in the direct method or in the metabolic activation method. 3. In the micronucleus test with Slc:ddY male mice, the drug did not significantly increase micronucleated polychromatic erythrocytes in the bone marrows. These results suggest that lactitol has no mutagenicity in vitro or in vivo.
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