Open Access

Effect of low- and high-linear energy transfer radiation on in vitro and orthotopic in vivo models of osteosarcoma by activation of caspase-3 and -9

  • Authors:
    • Eun Ho Kim
    • Mi-Sook Kim
    • Kyung-Hee Lee
    • Sei Sai
    • Youn Kyoung Jeong
    • Jae-Soo Koh
    • Chang-Bae Kong
  • View Affiliations

  • Published online on: August 25, 2017     https://doi.org/10.3892/ijo.2017.4102
  • Pages: 1124-1134
  • Copyright: © Kim et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Osteosarcoma (OS) is a malignant tumor of the bone derived from primitive transformed cells of the mesenchymal origin. Local low-linear energy transfer (LET) radiotherapy has limited benefits on OS owing to its radioresistance. Thus, this study aimed to investigate the effects of high-LET radiation on human OS. Therefore, the human OS cell lines, U2O2 and KHOS/NP, were examined in vitro, or an orthotopic mouse xenograft model was studied in vivo after treatment with low-LET (gamma-ray) and high-LET (neutron) radiation. Notably, OS cells were significantly more sensitive to high-LET radiation in vitro and in the orthotopic xenograft tumor model. Specifically, neutron radiation treatment increased the relative percentage of apoptotic sub-G1 phase cells via caspase-3/9 activation; increased intracellular reactive oxygen species, autophagy, and DNA damage; and decreased invasion and migration. Similarly, the mean size of gamma-irradiated (8 Gy) orthotopic KHOS/NP OS was 195 mm3 at 6 weeks after gamma-irradiation (8 Gy), but it was only 150 mm3 in mice treated with high-LET neutron radiotherapy. Significantly, our results provide a rationale for the use of high-LET radiotherapy to treat patients with OS.
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October-2017
Volume 51 Issue 4

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Kim EH, Kim M, Lee K, Sai S, Jeong YK, Koh J and Kong C: Effect of low- and high-linear energy transfer radiation on in vitro and orthotopic in vivo models of osteosarcoma by activation of caspase-3 and -9. Int J Oncol 51: 1124-1134, 2017.
APA
Kim, E.H., Kim, M., Lee, K., Sai, S., Jeong, Y.K., Koh, J., & Kong, C. (2017). Effect of low- and high-linear energy transfer radiation on in vitro and orthotopic in vivo models of osteosarcoma by activation of caspase-3 and -9. International Journal of Oncology, 51, 1124-1134. https://doi.org/10.3892/ijo.2017.4102
MLA
Kim, E. H., Kim, M., Lee, K., Sai, S., Jeong, Y. K., Koh, J., Kong, C."Effect of low- and high-linear energy transfer radiation on in vitro and orthotopic in vivo models of osteosarcoma by activation of caspase-3 and -9". International Journal of Oncology 51.4 (2017): 1124-1134.
Chicago
Kim, E. H., Kim, M., Lee, K., Sai, S., Jeong, Y. K., Koh, J., Kong, C."Effect of low- and high-linear energy transfer radiation on in vitro and orthotopic in vivo models of osteosarcoma by activation of caspase-3 and -9". International Journal of Oncology 51, no. 4 (2017): 1124-1134. https://doi.org/10.3892/ijo.2017.4102