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Article

5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine

  • Authors:
    • Ryutaro Mori
    • Manabu Futamura
    • Toshiyuki Tanahashi
    • Yoshihiro Tanaka
    • Nobuhisha Matsuhashi
    • Kazuya Yamaguchi
    • Kazuhiro Yoshida
  • View Affiliations / Copyright

    Affiliations: Department of Surgical Oncology, Gifu University Graduate School of Medicine, Gifu 501‑1194, Japan
  • Pages: 3162-3168
    |
    Published online on: June 30, 2017
       https://doi.org/10.3892/ol.2017.6512
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Abstract

The mechanism of 5‑fluorouracil (5FU) resistance was investigated, focusing on the level of thymidylate synthase (TS) ternary complex formed with fluoro‑deoxyuridine monophosphate (FdUMP). MKN45 and 5FU‑resistant MKN45/F2R cells were treated with 5FU and fluoro‑deoxyuridine (FdU) in combination with deoxyuridine (dU) and thymidine (dT). Subsequently, the levels of ternary complex were determined by western blotting and the cell viability was calculated using an MTT assay. MKN45/F2R cells exhibited 5FU resistance (56.2‑fold relative to MKN45 cells), and demonstrated decreased orotate phosphoribosyltransferase (OPRT) and increased TS levels, requiring a higher concentration of 5FU to induce ternary complex formation than MKN45 cells. Following transfection of small interfering RNA against OPRT, MKN45 exhibited increased resistance to 5FU and decreased ternary complex formation subsequent to treatment with 5FU, indicating that decreased OPRT led to increased 5FU resistance. However, MKN45/F2R also exhibited resistance to FdU, which can be converted to FdUMP without OPRT, and there was decreased ternary complex formation after treatment with FdU, indicating that the 5FU‑resistant cells had the ability to decrease intracellular FdUMP. The addition of dU and thymidine dT to 5FU promoted the formation of ternary complexes and reversed 5FU resistance in MKN45/F2R cells, although dT inhibited the efficacy of raltitrexed (another TS inhibitor). These results suggested that 5FU‑resistant cells had the ability to reduce intracellular FdUMP irrespective of decreased OPRT, which led to resistance to 5FU. This resistance was then inhibited by treatment with dT or dU.
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Copy and paste a formatted citation
Spandidos Publications style
Mori R, Futamura M, Tanahashi T, Tanaka Y, Matsuhashi N, Yamaguchi K and Yoshida K: 5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine. Oncol Lett 14: 3162-3168, 2017.
APA
Mori, R., Futamura, M., Tanahashi, T., Tanaka, Y., Matsuhashi, N., Yamaguchi, K., & Yoshida, K. (2017). 5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine. Oncology Letters, 14, 3162-3168. https://doi.org/10.3892/ol.2017.6512
MLA
Mori, R., Futamura, M., Tanahashi, T., Tanaka, Y., Matsuhashi, N., Yamaguchi, K., Yoshida, K."5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine". Oncology Letters 14.3 (2017): 3162-3168.
Chicago
Mori, R., Futamura, M., Tanahashi, T., Tanaka, Y., Matsuhashi, N., Yamaguchi, K., Yoshida, K."5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine". Oncology Letters 14, no. 3 (2017): 3162-3168. https://doi.org/10.3892/ol.2017.6512
Copy and paste a formatted citation
x
Spandidos Publications style
Mori R, Futamura M, Tanahashi T, Tanaka Y, Matsuhashi N, Yamaguchi K and Yoshida K: 5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine. Oncol Lett 14: 3162-3168, 2017.
APA
Mori, R., Futamura, M., Tanahashi, T., Tanaka, Y., Matsuhashi, N., Yamaguchi, K., & Yoshida, K. (2017). 5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine. Oncology Letters, 14, 3162-3168. https://doi.org/10.3892/ol.2017.6512
MLA
Mori, R., Futamura, M., Tanahashi, T., Tanaka, Y., Matsuhashi, N., Yamaguchi, K., Yoshida, K."5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine". Oncology Letters 14.3 (2017): 3162-3168.
Chicago
Mori, R., Futamura, M., Tanahashi, T., Tanaka, Y., Matsuhashi, N., Yamaguchi, K., Yoshida, K."5FU resistance caused by reduced fluoro‑deoxyuridine monophosphate and its reversal using deoxyuridine". Oncology Letters 14, no. 3 (2017): 3162-3168. https://doi.org/10.3892/ol.2017.6512
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