Abstract
Dimethylarsinous acid (DMAIII) induced tetraploidy and multinucleation in V79 cells. While the highest yield of tetraploids and multinucleated cells was at 1.25 microM of DMAIII, the mitotic index was highest at DMAIII 2.5 microM due to mitotic arrest. Mitosis was not observed at 5 microM. We observed V79 cells treated with DMAIII and visualized with rhodamine-phalloidin. Abnormal actin location was observed in the dividing cells which were treated with DMAIII and visualized with rhodamine-phalloidin. These findings suggested strongly that DMAIII inhibits not only formation of the normal mitotic spindle but cytokinesis and induces the formation of multinuclear cells.
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