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International Journal of Oncology
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Article

Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin

  • Authors:
    • Shinichi Tahata
    • Bo Yuan
    • Hidetomo Kikuchi
    • Norio Takagi
    • Toshihiko Hirano
    • Hiroo Toyoda
  • View Affiliations / Copyright

    Affiliations: Department of Clinical Molecular Genetics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan, Department of Applied Biochemistry, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan, Department of Clinical Pharmacology, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
  • Pages: 1749-1759
    |
    Published online on: July 28, 2014
       https://doi.org/10.3892/ijo.2014.2564
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Abstract

The cytocidal effect of pyrrolidine dithiocarbamate (PDTC) was investigated by focusing on cell viability, cell cycle arrest and apoptosis induction in small-cell lung cancer (SCLC) cell lines (NCI-H196 and NCI-H889). PDTC exhibited a much stronger dose-dependent cytotoxic activity against NCI-H196 compared to NCI-H889, while no such activity was observed in normal human embryonal lung fibroblast MRC-5 cells. Cell cycle arrest in S phase paralleled with suppression of c-myc expression without accompanying DNA fragmentation was observed in NCI-H196 cells. A transient increase in the intracellular ROS accompanied with an alteration of expression of oxidative stress-related genes was also confirmed in NCI-H196 cells. Furthermore, the addition of N-acetyl-l-cysteine (NAC), a free radical scavenger, not only abolished PDTC-trigger alterations of expression of these oxidative-related genes, but also almost completely abrogated PDTC-induced reduction in cell viability and morphological changes associated with cell damage. These results thus suggest that PDTC-induced cytotoxicity is attributed to its pro-oxidant activity. PDTC-induced cytotoxicity was further enhanced by CuCl2, however, abolished by bathocuproine disulfonate (BCPS), a non-permeable copper-specific chelator, supporting the plausibility that accumulation of intracellular Cu plays an important role in the cytotoxicity. Importantly, we demonstrated for the first time that PDTC downregulated the expression of ATP7A, known to be responsible for Cu efflux, but did not affect the expression of CTR1, known as a copper uptake transporter. Intriguingly, combination of much lower dose of cisplatin (5 µM) and non-toxic dose of PDTC (0.1 µM) synergistically induced a significant cytotoxicity in NCI-H196 cells. Given that ATP7A plays a critical role in the resistance of platinum-drug (such as cisplatin) representing a first-line treatment for SCLC, PDTC could be a promising candidate of adjunct therapeutic reagent for the patients requiring treatment with platinum-based regimens.
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Copy and paste a formatted citation
Spandidos Publications style
Tahata S, Yuan B, Kikuchi H, Takagi N, Hirano T and Toyoda H: Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin. Int J Oncol 45: 1749-1759, 2014.
APA
Tahata, S., Yuan, B., Kikuchi, H., Takagi, N., Hirano, T., & Toyoda, H. (2014). Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin. International Journal of Oncology, 45, 1749-1759. https://doi.org/10.3892/ijo.2014.2564
MLA
Tahata, S., Yuan, B., Kikuchi, H., Takagi, N., Hirano, T., Toyoda, H."Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin". International Journal of Oncology 45.4 (2014): 1749-1759.
Chicago
Tahata, S., Yuan, B., Kikuchi, H., Takagi, N., Hirano, T., Toyoda, H."Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin". International Journal of Oncology 45, no. 4 (2014): 1749-1759. https://doi.org/10.3892/ijo.2014.2564
Copy and paste a formatted citation
x
Spandidos Publications style
Tahata S, Yuan B, Kikuchi H, Takagi N, Hirano T and Toyoda H: Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin. Int J Oncol 45: 1749-1759, 2014.
APA
Tahata, S., Yuan, B., Kikuchi, H., Takagi, N., Hirano, T., & Toyoda, H. (2014). Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin. International Journal of Oncology, 45, 1749-1759. https://doi.org/10.3892/ijo.2014.2564
MLA
Tahata, S., Yuan, B., Kikuchi, H., Takagi, N., Hirano, T., Toyoda, H."Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin". International Journal of Oncology 45.4 (2014): 1749-1759.
Chicago
Tahata, S., Yuan, B., Kikuchi, H., Takagi, N., Hirano, T., Toyoda, H."Cytotoxic effects of pyrrolidine dithiocarbamate in small-cell lung cancer cells, alone and in combination with cisplatin". International Journal of Oncology 45, no. 4 (2014): 1749-1759. https://doi.org/10.3892/ijo.2014.2564
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