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Article

Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells

  • Authors:
    • Sachio Maehara
    • Jitsuo Usuda
    • Taichiro Ishizumi
    • Shuji Ichinose
    • Keishi Ohtani
    • Tatsuya Inoue
    • Kentaro Imai
    • Hideyuki Furumoto
    • Yujin Kudo
    • Naohiro Kajiwara
    • Tatsuya Ohira
    • Norihiko Ikeda
  • View Affiliations / Copyright

    Affiliations: Department of Surgery, Tokyo Medical University, Tokyo 160‑0023, Japan, Department of Thoracic Surgery, Nippon Medical School, Tokyo 113‑8603, Japan
  • Pages: 741-749
    |
    Published online on: November 10, 2014
       https://doi.org/10.3892/ijo.2014.2746
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Abstract

To identify a possible new treatment modality for malignant pleural mesothelioma (MPM), we examined whether combination treatment consisting of pemetrexed chemotherapy and photodynamic therapy (PDT) using the photosensitizer NPe6, enhanced the antitumor effect in both in vitro and in vivo models. We also investigated preclinical treatment schedules. Four human malignant mesothelioma cell lines (MSTO‑211H, H2052, H2452 and H28) were assayed using the WST assay after treatment with pemetrexed and NPe6‑PDT. The treatment schedule for the combination treatment was examined using nude mice. Pemetrexed pre‑treatment enhanced the lethal effect of NPe6‑PDT in the four malignant mesothelioma cell lines, but NPe6‑PDT followed by pemetrexed treatment did not enhance cell lethality in the in vitro assay. Pemetrexed pre‑treatment did not enhance the intracellular accumulation of NPe6, which is one of the determinants of the antitumor effect of PDT. In nude mice injected with MSTO‑211H cells and then treated using a combination of pemetrexed and NPe6‑PDT (10 mg/kg NPe6, 10 J/cm2 laser irradiation), the tumor volume decreased by 50% but subsequently increased, reaching the pre‑treatment value after 14 days. Pemetrexed treatment followed by NPe6‑PDT resulted in an 80% reduction in the tumor size and inhibited re‑growth. NPe6‑PDT followed by pemetrexed treatment resulted in a 60% reduction in tumor size but did not inhibit re‑growth. NPe6‑PDT induced the expression of thymidylate synthase (TS), which confers resistance to pemetrexed, and NPe6‑PDT followed by pemetrexed treatment did not enhance the treatment outcome in vivo. In conclusion, combination treatment, consisting of pemetrexed followed by NPe6‑PDT, should be further investigated as a new treatment modality for MPM. In the future, this combination treatment may contribute to a reduction in local recurrence and a prolonged survival period in patients with MPM.
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Copy and paste a formatted citation
Spandidos Publications style
Maehara S, Usuda J, Ishizumi T, Ichinose S, Ohtani K, Inoue T, Imai K, Furumoto H, Kudo Y, Kajiwara N, Kajiwara N, et al: Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells. Int J Oncol 46: 741-749, 2015.
APA
Maehara, S., Usuda, J., Ishizumi, T., Ichinose, S., Ohtani, K., Inoue, T. ... Ikeda, N. (2015). Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells. International Journal of Oncology, 46, 741-749. https://doi.org/10.3892/ijo.2014.2746
MLA
Maehara, S., Usuda, J., Ishizumi, T., Ichinose, S., Ohtani, K., Inoue, T., Imai, K., Furumoto, H., Kudo, Y., Kajiwara, N., Ohira, T., Ikeda, N."Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells". International Journal of Oncology 46.2 (2015): 741-749.
Chicago
Maehara, S., Usuda, J., Ishizumi, T., Ichinose, S., Ohtani, K., Inoue, T., Imai, K., Furumoto, H., Kudo, Y., Kajiwara, N., Ohira, T., Ikeda, N."Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells". International Journal of Oncology 46, no. 2 (2015): 741-749. https://doi.org/10.3892/ijo.2014.2746
Copy and paste a formatted citation
x
Spandidos Publications style
Maehara S, Usuda J, Ishizumi T, Ichinose S, Ohtani K, Inoue T, Imai K, Furumoto H, Kudo Y, Kajiwara N, Kajiwara N, et al: Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells. Int J Oncol 46: 741-749, 2015.
APA
Maehara, S., Usuda, J., Ishizumi, T., Ichinose, S., Ohtani, K., Inoue, T. ... Ikeda, N. (2015). Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells. International Journal of Oncology, 46, 741-749. https://doi.org/10.3892/ijo.2014.2746
MLA
Maehara, S., Usuda, J., Ishizumi, T., Ichinose, S., Ohtani, K., Inoue, T., Imai, K., Furumoto, H., Kudo, Y., Kajiwara, N., Ohira, T., Ikeda, N."Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells". International Journal of Oncology 46.2 (2015): 741-749.
Chicago
Maehara, S., Usuda, J., Ishizumi, T., Ichinose, S., Ohtani, K., Inoue, T., Imai, K., Furumoto, H., Kudo, Y., Kajiwara, N., Ohira, T., Ikeda, N."Combination effect of photodynamic therapy using NPe6 with pemetrexed for human malignant pleural mesothelioma cells". International Journal of Oncology 46, no. 2 (2015): 741-749. https://doi.org/10.3892/ijo.2014.2746
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