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Characterization of rapid recovery from gamma-ray damage in plateau-phase human diploid fibroblasts.

Rapid recovery was investigated in density-inhibited, stationary-phase human diploid cells subcultured to low density at various times after a single dose of radiation. The influence of total dose, postirradiation temperature, and cell-to-cell contact on recovery was examined. The cultures were exposed to /sup 60/Co ..gamma.. rays at a dose rate of 50 rad per second. When the irradiation and postirradiation temperatures were maintained at 25 or 37/sup 0/C, recovery, as manifested by an enhancement in survival, was similar during the first 30 min, whereas it was reduced at later times in the 25/sup 0/C compared with the 37/sup 0/C cultures. This result suggests the existence of different rapidly and slowly acting components to recovery. No recovery was noted at any time with incubation at 4/sup 0/C. The recovery observed in density-inhibited cultures was consistently greater than that in less dense cultures, suggesting an effect of cell-to-cell contact and cell cycle distribution. Following single doses of 200 to 900 rad, progressive enhancement in relative recovery occurred with increasing doses over a period of 2 to 90 min, illustrating the importance of the relationship of the dose to the rapid recovery process.