Abstract
Traditional radiobiology has aimed at elucidating the mechanism of radiosensitivity of cancer cells and normal cells. Because the mechanism of DNA double-strand break (DSB) repair, which is inherently important to radiosensitivity, was unknown, it has been difficult to obtain results applicable to clinical radiotherapy from traditional radiobiology research. Today, however, the molecular mechanism of DNA DSB repair has been elucidated because of the rapid advances in molecular biology. In DNA DSB repair, at least two major repair mechanisms, homologous recombination and nonhomologous end joining (NHEJ) have been reported. In the NHEJ pathway, DSBs are directly, or after processing of the DNA ends, rejoined at an appropriate chromosomal end. DNA-dependent protein kinase (DNA-PK) plays an important role in DNA DSB repair by NHEJ. We have investigated how the ability of repair of DNA DSB influences cancer susceptibility and the radiosensitivity of tumors and normal tissues by focusing on the activity of DNA-PK. In the near future, research on DNA DSB repair mechanism will be able to be applied to research on carcinogenesis, prediction of radiosensitivity of tumors and normal cells, and sensitization of tumor cells.
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Sakata, Ki., Someya, M., Matsumoto, Y. et al. Ability to repair DNA double-strand breaks related to cancer susceptibility and radiosensitivity. Radiat Med 25, 433–438 (2007). https://doi.org/10.1007/s11604-007-0161-3
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DOI: https://doi.org/10.1007/s11604-007-0161-3