Roles of DNA-dependent protein kinase and ATM in cell-cycle-dependent radiation sensitivity in human cells

M. Yoshida, Y. Hosoi, H. Miyachi, N. Ishii, Y. Matsumoto, A. Enomoto, K. Nakagawa, S. Yamada, N. Suzuki, T. Ono

研究成果: Article査読

24 被引用数 (Scopus)

抄録

Purpose: The roles of DNA-dependent protein kinase (DNA-PK) and ATM in the cell-cycle-dependent radiosensitivity in human cells were investigated. Methods and materials: A DNA-PK activity-deficient human glioblastoma cell line M059J, ataxia telangiectasia cell lines AT3BISV and AT5BIVA, and control cell lines were used. Wortmannin inhibited DNA-PK and ATM activities. Cells were synchronized by hydroxyurea. Progression through the cell cycle was analysed by flow cytometry. Results: M059J exhibited hyper-radiosensitivity throughout the cell cycle, with extreme hyper-radiosensitivity in G1 to early S-phase compared with the control cell line M059K. AT3BISV and AT5BIVA exhibited hyper-radiosensitivity throughout the cell cycle but showed a similar pattern of cell-cycle-dependent radiosensitivity to that observed in LM217 or HeLa cells. In AT3BISV and AT5BIVA, radiosensitization by wortmannin was observed throughout the cell cycle and was most prominent in G1 to early S-phase. Wortmannin did not sensitize M059J to ionizing radiation in any cell-cycle phase. DNA-PK activities were not different throughout the cell cycle. Conclusion: The results suggest that (1) non-homologous end-joining plays a dominant role in G1 to early S-phase and a minor role in late S to G2-phase in repairing DNA double-strand breaks, (2) the role of ATM in repairing double-strand breaks may be almost cell-cycle-independent and (3) the dominant role of non-homologous end-joining during G1 to early S-phase is not due to cell-cycle-dependent fluctuations in DNA-PK activity.

本文言語English
ページ(範囲)503-512
ページ数10
ジャーナルInternational Journal of Radiation Biology
78
6
DOI
出版ステータスPublished - 2002

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

フィンガープリント 「Roles of DNA-dependent protein kinase and ATM in cell-cycle-dependent radiation sensitivity in human cells」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル