期刊
ONCOGENE
卷 21, 期 41, 页码 6377-6381出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1205782
关键词
ku; ATM; S phase checkpoint; ionizing radiation
资金
- NCI NIH HHS [T32-CA09137, P30-CA56036, CA76203, CA 56909, CA 50519] Funding Source: Medline
- NIA NIH HHS [AG18949] Funding Source: Medline
Following exposure to genotoxic stress, proliferating cells actively slow down DNA replication through an S phase checkpoint to provide time for repair. The ATM-dependent pathway plays an important role in the S phase checkpoint response following ionizing irradiation. We report that there is a stronger S phase checkpoint response in irradiated Ku80(-/-) cells as compared with their wild-type counterparts, which has no relationship to DNA-dependent protein kinase (DNA-PK) activity but correlates with a higher ATM activity and with more ATM bound to chromatin DNA in such cells. Wortmannin, a nonspecific inhibitor of ATM, not only reduces the higher activity of ATM kinase, but also abolishes the stronger S phase checkpoint response in Ku80(-/-) cells. Furthermore, a specific ATM antisense oligonucleotide abolishes the stronger S checkpoint response in Ku80(-/-) cells and renders these cells practically indistinguishable from Ku80(+/+) cells for this endpoint. These results in aggregate indicate that the stronger S checkpoint in irradiated Ku80(-/-) cells is due to the higher ATM kinase activity.
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