Open Access

Synergistic effects of tetrandrine combined with ionizing radiation on a murine colorectal carcinoma‑bearing mouse model

  • Authors:
    • Wei‑Chan Lin
    • Wei‑Hsun Wang
    • Yi‑Hsien Lin
    • Jyh‑Der Leu
    • Shan‑Yun Cheng
    • Yu‑Jen Chen
    • Jeng‑Jong Hwang
  • View Affiliations

  • Published online on: July 12, 2018     https://doi.org/10.3892/or.2018.6568
  • Pages: 1390-1400
  • Copyright: © Lin et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Tetrandrine (TET), a traditional Chinese clinical agent, has been used for the treatment of many diseases, including cancers. The purpose of the present study was to investigate the combined effects of TET and ionizing radiation (IR) on murine CT26 colorectal adenocarcinoma cells in vitro and in vivo. A CT26 cell line transfected with dual HSV‑1 thymidine kinase and firefly luciferase (luc) reporter genes was used. The half‑maximal inhibitory concentration (IC50) of TET in CT26/tk‑luc cells was ~10 µM. An additive effect was observed after combination of both agents based on a colony formation assay. Apoptosis and cleaved caspase‑3 levels were increased significantly in cells after combination treatment, as shown by flow cytometric analysis, DNA fragmentation and western blotting. However, tumor growth inhibition and therapeutic efficacy of TET combined with IR in vivo were identified to be synergistic, as monitored by tumor growth delay time, measured with a digital caliper. A significant inhibition of tumor growth was identified in the combination group compared with the radiation only group. Furthermore, non‑invasive bioluminescent imaging (BLI) and gamma scintigraphy were also used to evaluate therapeutic efficacy. Both modalities revealed that the best tumor growth control was under combination treatment among all groups. The present study demonstrated that TET is not only beneficial for chemotherapy, but also has potential as a radiosensitizer for the treatment of cancer.
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September-2018
Volume 40 Issue 3

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Lin WC, Wang WH, Lin YH, Leu JD, Cheng SY, Chen YJ and Hwang JJ: Synergistic effects of tetrandrine combined with ionizing radiation on a murine colorectal carcinoma‑bearing mouse model. Oncol Rep 40: 1390-1400, 2018
APA
Lin, W., Wang, W., Lin, Y., Leu, J., Cheng, S., Chen, Y., & Hwang, J. (2018). Synergistic effects of tetrandrine combined with ionizing radiation on a murine colorectal carcinoma‑bearing mouse model. Oncology Reports, 40, 1390-1400. https://doi.org/10.3892/or.2018.6568
MLA
Lin, W., Wang, W., Lin, Y., Leu, J., Cheng, S., Chen, Y., Hwang, J."Synergistic effects of tetrandrine combined with ionizing radiation on a murine colorectal carcinoma‑bearing mouse model". Oncology Reports 40.3 (2018): 1390-1400.
Chicago
Lin, W., Wang, W., Lin, Y., Leu, J., Cheng, S., Chen, Y., Hwang, J."Synergistic effects of tetrandrine combined with ionizing radiation on a murine colorectal carcinoma‑bearing mouse model". Oncology Reports 40, no. 3 (2018): 1390-1400. https://doi.org/10.3892/or.2018.6568