Abstract
Intraperitoneal (i.p.) injection and oral (p.o.) gavage were evaluated in the mouse micronucleus test with mitomycin C (MMC). The tests were carried out in 2 laboratories with the MS/Ae and CD-1 mouse strains. On the basis of a small-scale acute toxicity study and a pilot experiment, the full-scale micronucleus test was performed with a 24-h sampling time at doses of 1, 2, 4, and 8 mg/kg for both treatment routes. In both strains, a clear positive dose-response relation was shown by both routes. Although the frequency of micronucleated polychromatic erythrocytes (MNPCEs) was higher with i.p. on a mg/kg basis, this tendency was reversed when dose was expressed as a percentage of the LD 50.
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