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Rounded mitotic cells showed 30% enhanced electrophoretic mobility (EPM) when compared to spindle-formed interphase cells. This increase in EPM that was not present in interphase cells that had been rounded chemically by EDTA is considered to reflect a structural change in the cell membrane during mitosis. X-ray irradiation induced a dose-dependent EPM decrease in both interphase and mitotic cells during a 4-hour period. During the next 20 h of incubation, EPM recovery took place in cells irradiated with 250R, but not in cells exposed to 1000R. EPM was enhanced during mitosis in cells irradiated with low doses, but was absent in cells irradiated with 1000R. The ratio of colony-forming cells and of electrophoretically recovered mitotic cells after 24 h of exposure showed a good statistical correlation. These results indicate that unrepaired membrane damage contributes to mitotic cell death after irradiation.

No elevated cell surface charge at mitosis in X-ray-irradiated mammalian cells.