Format

Send to

Choose Destination
Mutat Res. 1989 Oct;214(2):321-8.

X-ray-induced G2 arrest in ataxia telangiectasia lymphoblastoid cells.

Author information

1
Division of Radiation Biology, Faculty of Pharmaceutical Sciences, Kanazawa University, Japan.

Abstract

Sensitivity to X-ray-induced G2 arrest was compared between ataxia telangiectasia (AT) lymphoblastoid cells and normal human cells. Flow cytometrical analysis of cells following X-ray irradiation revealed that the fraction of cells with 4n DNA content was greater in AT cells than in normal cells as previously reported by other investigators. However, the other parameters for cell-cycle progression kinetics including mitotic indices, cumulative mitotic indices and cumulative labelled mitotic indices indicated that X-ray-induced G2 arrest as a function of dose in AT cells was indistinguishable from that in normal cells. Moreover, no significant difference in cell viability was noted between AT and normal cells until 48 h following X-irradiation up to 2.6 Gy, although X-irradiated AT cells, compared to normal cells, showed a significantly decreased survival in terms of cell multiplication in growth medium and colony formation in soft agar. These data collectively suggest that the greater accumulation of AT cells with 4n DNA content in flow cytometry cannot be attributed to more stringent irreversible blockage of cell-cycle progression at the G2 phase and eventual cell death there. The possible reasons for this greater accumulation are discussed.

PMID:
2797028
DOI:
10.1016/0027-5107(89)90174-7
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center