Cratoxylum formosum Dyer is the Thai vegetable which commonly consumed a fresh leaves. In this study, we extracted Cratoxylum formosum with water and tested the extract for genotoxicity and anti-genotoxicity effects. We carried out the experiment using micronucleus test and comet assay in TK6 cells. In micronucleus experiment, we used cytokinesis-block proliferation technique to stop cell divis...

Baccharis dracunculifolia De Candole (DC) (Asteraceae) is indigenous throughout southeastern Latin America and is used by local people in traditional medicine. This plant is known to be the source of resin for the highly valued Brazilian green propolis. As no information is available on the safety of high doses of B. dracunculifolia extract, we evaluated the mutagenic potential of high doses of...

Methods are currently being explored which would permit the application of cytogenetic procedures such as metaphase and anaphase analyses to in vivo mammalian systems in order that due consideration may be given to metabolic activation or detoxification reactions which might affect the mutagenic or clastogenic (chromosome breaking) potential of environmental agents under study. It has been reco...

Enhanced sensitivity to the chromosome-damaging effects of ionizing radiation is a feature of many cancer-predisposing conditions. It has been suggested that women with breast cancer are deficient in the repair of radiation-induced DNA damage. We have now investigated whether mutagen sensitivity is related to mutations in the breast cancer gene BRCA1. We studied the induction and repair of DNA ...

The mouse (Mus musculus) bone marrow micronucleus test was carried out using 24 outbred National Institutes of Health (NIH) mice, 24 inbred Swiss Webster (CFW) mice and 20 inbred Bagg albino/color locus Jackson (BALB/cJ) mice. The mice in the experimental group (n = 32) were injected intraperitoneally with 133 mg kg of metronidazole parenteral solution and the control group consisted of mice (n...

As two cytogenetic parameters of radiation exposure, the frequency of micronucleus in erythroblasts, lymphocytes and red cells (Howell-Jolly body) as well as chromosome aberrations in bone marrow cells and in lymphocytes were studied in 24 thorotrast patients and in 32 atomic bomb (A-bomb) survivors who were exposed within one kilometer from the Hiroshima hypocenter. The incidence of both micro...