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. 1976 Apr;16(4):303–318. doi: 10.1016/S0006-3495(76)85690-1

Lethal response of HeLa cells to x-irradiation in the latter part of the generation cycle.

T D Griffith, L J Tolmach
PMCID: PMC1334844  PMID: 1252583

Abstract

The age-response for the killing of HeLa S3 cells by X-rays during the latter part of the generation cycle has been examined in detail. As synchronous cells move from the G1/S boundary through S phase, the relatively high sensitivity of late G1 cells gradually decreases; minimum sensitivity is reached in mid-S and maintained during the remainder of that phase. The response of cells as they progress from S to the point in G2 at which they are temporarily arrested by radiation (or by inhibitors of protein synthesis) was measured in populations free of both S phase cells and late G2 cells that had passed the arrest point: cells retain their high resistance from early G2 up to the arrest point. The response of G2 cells that have passed the arrest point before being irradiated was examined by exposing randomly growing cultures to X-rays and collecting cells periodically thereafter, as they entered mitosis. Survival values very close to those of sensitive mitotic cells were found in the 2 h period after irradiation during which unarrested cells continued to reach mitosis. Values typical of lateS/early G2 were found only after cells that had been arrested began arriving at mitosis. Thus, HeLa S3 cell undergo an abrupt increase in sensitivity at or near the arrest point. The sensitivity to a second irradiation of cells arrested in G2 by a conditioning X-ray dose increases rapidly in the early part of the arrest period.

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Selected References

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