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International Journal of Oncology
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Print ISSN: 1019-6439 Online ISSN: 1791-2423
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March 2013 Volume 42 Issue 3

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Article

Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis

  • Authors:
    • Fenghua Chen
    • Chang Xu
    • Liqing Du
    • Yan Wang
    • Jia Cao
    • Yue Fu
    • Yanting Guo
    • Qiang Liu
    • Feiyue Fan
  • View Affiliations / Copyright

    Affiliations: Department of Radiation Hazard Evaluation, Institute of Radiation Medicine of Chinese Academy of Medical Science and Peking Union Medical College, Tianjin 300192, P.R. China
  • Pages: 985-992
    |
    Published online on: January 22, 2013
       https://doi.org/10.3892/ijo.2013.1785
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Abstract

A major concern in cancer therapy is resistance of tumors such as human non-small cell lung cancer and esophageal cancer to radiotherapy. Intrinsic radioresistance of these cancer cells limits therapeutic efficiency. Here, we determined in two cancer cell lines the potential radiosensitizing activity of Tat-SmacN7, a small molecule compound, which mimics the activity of Smac, a mitochondrial protein released during apoptosis. We found that Tat-SmacN7 can enter the cells and promote RNA expression and the activity of caspase-3, -8 and -9 and sensitized the cancer cells to radiation with a sensitization enhancement ratio (SER) of 1.5-1.6. Tat-SmacN7 radiosensitization was mediated by both extrinsic and intrinsic apoptosis pathways through activation of caspases. Consistently, blockage of caspase activation, through treatment with a caspase inhibitor, z-VAD-fmk, inhibited apoptosis and abrogated Tat-SmacN7 radiosensitization. Our study demonstrates that Tat-SmacN7 also has radiosensitization effects in vivo, so it could be further developed as a novel class of radiosensitizers for the treatment of radioresistant human non-small cell lung cancer and esophageal cancer.
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Copy and paste a formatted citation
Spandidos Publications style
Chen F, Xu C, Du L, Wang Y, Cao J, Fu Y, Guo Y, Liu Q and Fan F: Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis. Int J Oncol 42: 985-992, 2013.
APA
Chen, F., Xu, C., Du, L., Wang, Y., Cao, J., Fu, Y. ... Fan, F. (2013). Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis. International Journal of Oncology, 42, 985-992. https://doi.org/10.3892/ijo.2013.1785
MLA
Chen, F., Xu, C., Du, L., Wang, Y., Cao, J., Fu, Y., Guo, Y., Liu, Q., Fan, F."Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis". International Journal of Oncology 42.3 (2013): 985-992.
Chicago
Chen, F., Xu, C., Du, L., Wang, Y., Cao, J., Fu, Y., Guo, Y., Liu, Q., Fan, F."Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis". International Journal of Oncology 42, no. 3 (2013): 985-992. https://doi.org/10.3892/ijo.2013.1785
Copy and paste a formatted citation
x
Spandidos Publications style
Chen F, Xu C, Du L, Wang Y, Cao J, Fu Y, Guo Y, Liu Q and Fan F: Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis. Int J Oncol 42: 985-992, 2013.
APA
Chen, F., Xu, C., Du, L., Wang, Y., Cao, J., Fu, Y. ... Fan, F. (2013). Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis. International Journal of Oncology, 42, 985-992. https://doi.org/10.3892/ijo.2013.1785
MLA
Chen, F., Xu, C., Du, L., Wang, Y., Cao, J., Fu, Y., Guo, Y., Liu, Q., Fan, F."Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis". International Journal of Oncology 42.3 (2013): 985-992.
Chicago
Chen, F., Xu, C., Du, L., Wang, Y., Cao, J., Fu, Y., Guo, Y., Liu, Q., Fan, F."Tat-SmacN7 induces radiosensitization in cancer cells through the activation of caspases and induction of apoptosis". International Journal of Oncology 42, no. 3 (2013): 985-992. https://doi.org/10.3892/ijo.2013.1785
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