Antimutagenicity of rosmarinic acid in Swiss mice evaluated by the micronucleus assay.

Rosmarinic acid (RA) is a natural phenolic compound which presents different biological activities such as antitumor, antibacterial, anti-inflammatory, hepatoprotective and cardioprotective properties. In view of its important biological activities, the study of the effects of RA on genetic material becomes relevant. Thus, the objective of the present study was to evaluate the mutagenic and/or antimutagenic potential of RA on peripheral blood cells of Swiss mice using the micronucleus assay. Three doses of RA (50, 100 and 200 mg/kg body weight, b.w.) were used for the evaluation of its mutagenic potential. In the antimutagenicity assays, the different concentrations of RA were combined with the chemotherapeutic agent doxorubicin (DXR, 15 mg/kg b.w.). Peripheral blood samples were collected 24, 48 and 72 h after treatment for the evaluation of micronucleated polychromatic erythrocytes (MNPCEs). The results of the mutagenicity assays showed no increase in the frequency of micronuclei in animals treated with different concentrations of RA when compared to the negative controls. Treatment with different concentrations of RA combined with DXR revealed a significant reduction in the frequency of micronuclei compared to animals treated with DXR only. Although the mechanisms underlying the protective effect of RA are not completely understood, the putative antioxidant activity of RA might explain its effect on DXR mutagenicity.