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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Mi Sun (Department of Radiation Oncology, Yonsei University College of Medicine) Lee, Eun-Jung (Department of Radiation Oncology, Yonsei University College of Medicine) Kim, Jae-Won (Department of Radiation Oncology, Yonsei University College of Medicine) Chung, Ui Seok (Department of Chemical and Biomolecular Engineering, Yonsei University) Koh, Won-Gun (Department of Chemical and Biomolecular Engineering, Yonsei University) Keum, Ki Chang (Department of Radiation Oncology, Yonsei University College of Medicine) Koom, Woong Sub (Department of Radiation Oncology, Yonsei University College of Medicine)
저널정보
대한방사선종양학회 Radiation oncology journal : ROJ Radiation oncology journal : ROJ 제34권 제3호
발행연도
2016.1
수록면
230 - 238 (9page)

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Purpose: Hypoxia can impair the therapeutic efficacy of radiotherapy (RT). Therefore, a new strategy is necessary for enhancing the response to RT. In this study, we investigated whether the combination of nanoparticles and RT is effective in eliminating the radioresistance of hypoxic tumors. Materials and Methods: Gold nanoparticles (GNPs) consisting of a silica core with a gold shell were used. CT26 colon cancer mouse model was developed to study whether the combination of RT and GNPs reduced hypoxia-induced radioresistance. Hypoxia inducible $factor-1{\alpha}$ ($HIF-1{\alpha}$) was used as a hypoxia marker. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) staining were conducted to evaluate cell death. Results: Hypoxic tumor cells had an impaired response to RT. GNPs combined with RT enhanced anti-tumor effect in hypoxic tumor compared with RT alone. The combination of GNPs and RT decreased tumor cell viability compare to RT alone in vitro. Under hypoxia, tumors treated with GNPs + RT showed a higher response than that shown by tumors treated with RT alone. When a reactive oxygen species (ROS) scavenger was added, the enhanced antitumor effect of GNPs + RT was diminished. Conclusion: In the present study, hypoxic tumors treated with GNPs + RT showed favorable responses, which might be attributable to the ROS production induced by GNPs + RT. Taken together, GNPs combined with RT seems to be potential modality for enhancing the response to RT in hypoxic tumors.

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