cis-Dichlorodiammine platinum(II) induced aberrations in mouse bone-marrow chromosomes.

The clastogenic effect of cis-dichlorodiammine platinum(II) (cis-platin) on mouse bone-marrow chromosomes has been studied. Cis-platin was injected at 3 different doses. Cells were fixed at different time intervals after treatment. Different types of aberrations together with the percent of mitotic index and frequency of abnormal metaphases were studied. The aberrations observed were primarily chromatid breaks, although isochromatid breaks, interchanges, and multiple breaks were also observed. A dose- and time-dependent effect was observed for both inhibition of mitotic index and frequency of abnormal metaphases. Trypsin-Giemsa staining of bone-marrow metaphase chromosomes from normal mice was compared with the bands of metaphase chromosomes obtained after Giemsa staining of chromosomes from platinum-treated mice and they were observed to be identical. Bands were present up to 120 h and aberrations were also induced in such plates.