@article{oai:repo.qst.go.jp:00045791,
 author = {Takahashi, Momoko and Takakura, Kaoru and Furusawa, Yoshiya and 高橋 桃子 and 高倉 かほる and 古澤 佳也},
 issue = {5},
 journal = {Radiation Research},
 month = {Mar},
 note = {In this study, we attempted to clarify the influence of the DNA repair genes RAD54 and KU70, components of the homologous recombination (HR) and non-homologous end-joining (NHEJ) pathways, respectively, on apoptosis induced by 1 Gy (low-dose) and 5 Gy (high-dose) irradiation. All experiments were performed using chicken B-lymphocyte DT40 cells and the DNA repair-deficient cell lines KU70-/-, RAD54-/- and KU70-/-/ RAD54-/-. Morphological changes were detected by fluorescence methods, and the sub-G1 fraction and the activated caspases in DT40 cells were analyzed by flow cytometry. Irradiation with 1 Gy significantly increased the level of apoptosis in cells with the defective DNA repair genes, with the maximum apoptosis occurring in double mutant cells, KU70-/-/RAD54-/-, demonstrating that 1 Gy is enough to induce apoptosis in DNA repair-deficient DT40 cells, and that KU70 and RAD54 must have almost the same role in low-dose radiation-induced apoptosis. After 5 Gy, fast induction of apoptosis, within 2 h, was seen in both wild-type cells and RAD54-/- cells, indicating that functional KU70 must be important for the rescue of the cells from the induction of fast apoptosis.},
 pages = {645--650},
 title = {Comparison of the Kinetics of Radiation-Induced Apoptosis in DT40 Cells Irradiated with Low and High Doses of X Rays},
 volume = {173},
 year = {2010}
}