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β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species

  • Authors:
    • Seo‑Young Kwak
    • Youn Kyoung Jeong
    • Bu‑Yeon Kim
    • Ji Young Lee
    • Hyun‑Joo Ahn
    • Jae‑Hoon Jeong
    • Mi‑Sook Kim
    • Joon Kim
    • Young‑Hoon Han
  • View Affiliations / Copyright

    Affiliations: Division of Radiation Cancer Research, Korea Institute of Radiological and Medical Sciences, Nowon‑gu, Seoul 139‑706, Republic of Korea, Research Center for Radiotherapy, Korea Institute of Radiological and Medical Sciences, Nowon‑gu, Seoul 139‑706, Republic of Korea, Laboratory of Biochemistry, School of Life Sciences and Biotechnology, Korea University, Seoul 136‑701, Republic of Korea
  • Pages: 1812-1818
    |
    Published online on: March 31, 2014
       https://doi.org/10.3892/ol.2014.2018
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Abstract

Shikonin, a naphthoquinone derivative, has been shown to possess antitumor activity. In the present study, the effects of shikonin and its analog, β,β‑dimethylacrylshikonin, were investigated as radiosensitizers on the human colon cancer cell line, HCT‑116. Shikonin and, to a greater extent, its analog‑induced apoptosis of HCT‑116 cells further synergistically potentiated the induction of apoptosis when combined with ionizing radiation (IR) treatment. Shikonins also stimulated an increase in reactive oxygen species (ROS) production and IR‑induced DNA damage. Pre‑treatment with the ROS scavenger, N‑acetylcysteine, suppressed the enhancement of IR‑induced DNA damage and apoptosis stimulated by shikonins, indicating that shikonins exert their radiosensitizing effects through ROS upregulation. The radiosensitizing effect of shikonins was also examined in vivo using the xenograft mouse model. Consistent with the in vitro results, injection of β,β‑dimethylacrylshikonin combined with IR treatment significantly suppressed tumor growth of the HCT‑116 xenograft. Taken together, the results show that β,β‑dimethylacrylshikonin is a promising agent for developing an improved strategy for radiotherapy against tumors.
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Copy and paste a formatted citation
Spandidos Publications style
Kwak SY, Jeong YK, Kim BY, Lee JY, Ahn HJ, Jeong JH, Kim MS, Kim J and Han YH: β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species. Oncol Lett 7: 1812-1818, 2014.
APA
Kwak, S., Jeong, Y.K., Kim, B., Lee, J.Y., Ahn, H., Jeong, J. ... Han, Y. (2014). β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species. Oncology Letters, 7, 1812-1818. https://doi.org/10.3892/ol.2014.2018
MLA
Kwak, S., Jeong, Y. K., Kim, B., Lee, J. Y., Ahn, H., Jeong, J., Kim, M., Kim, J., Han, Y."β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species". Oncology Letters 7.6 (2014): 1812-1818.
Chicago
Kwak, S., Jeong, Y. K., Kim, B., Lee, J. Y., Ahn, H., Jeong, J., Kim, M., Kim, J., Han, Y."β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species". Oncology Letters 7, no. 6 (2014): 1812-1818. https://doi.org/10.3892/ol.2014.2018
Copy and paste a formatted citation
x
Spandidos Publications style
Kwak SY, Jeong YK, Kim BY, Lee JY, Ahn HJ, Jeong JH, Kim MS, Kim J and Han YH: β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species. Oncol Lett 7: 1812-1818, 2014.
APA
Kwak, S., Jeong, Y.K., Kim, B., Lee, J.Y., Ahn, H., Jeong, J. ... Han, Y. (2014). β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species. Oncology Letters, 7, 1812-1818. https://doi.org/10.3892/ol.2014.2018
MLA
Kwak, S., Jeong, Y. K., Kim, B., Lee, J. Y., Ahn, H., Jeong, J., Kim, M., Kim, J., Han, Y."β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species". Oncology Letters 7.6 (2014): 1812-1818.
Chicago
Kwak, S., Jeong, Y. K., Kim, B., Lee, J. Y., Ahn, H., Jeong, J., Kim, M., Kim, J., Han, Y."β,β‑Dimethylacrylshikonin sensitizes human colon cancer cells to ionizing radiation through the upregulation of reactive oxygen species". Oncology Letters 7, no. 6 (2014): 1812-1818. https://doi.org/10.3892/ol.2014.2018
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