Abstract：
:The mechanism underlying the induction of micronuclei induced by rifampicin and nicotine in mouse bone marrow was investigated by fluorescence in situ hybridization assay using mouse minor satellite DNA probe. Colchicine and mitomycin, known to be predominantly clastogenic and aneugenic, respectively were used as positive controls and these compounds produced the expected responses. In animals treated with different doses of rifampicin (10-320 mg/kg), the frequencies of micronucleated polychromatic erythrocytes (MNPCE) increased significantly after treatment with 160 and 320 mg/kg. Furthermore, rifampicin caused a significant depression of erythroblast proliferation at the high dose. At the two highest doses of 160 and 320 mg/kg rifampicin, a total of 0.96% and 1.44% MNPCE, respectively were found. Of the rifampicin-induced signal-positive MNPCE, an average of 58.1% of them was centromere-negative, reflecting the clastogenic activity of rifampicin. Correspondingly, about 41.9% of induced MNPCE were centromere-positive, representing the aneugenic activity of rifampicin. Eight and 16 mg/kg of nicotine induced 0.84% and 1.2% MNPCE, respectively, and of these an average of 29.5% showed one or more fluorescent signals, reflecting the predominant clastogenic activity of nicotine. The results obtained demonstrate that rifampicin induced both chromosome breakage and numerical chromosomal abnormalities, whereas nicotine induced one type of MNPCE and it could be considered a clastogenic agent.
journal_name
Toxicologyjournal_title
Toxicologyauthors
Attia SMdoi
10.1016/j.tox.2007.03.011subject
Has Abstractpub_date
2007-06-03 00:00:00pages
112-8issue
1-2eissn
0300-483Xissn
1879-3185pii
S0300-483X(07)00180-1journal_volume
235pub_type
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