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Article Open Access

Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines

  • Authors:
    • Yasuhiro Arakawa
    • Koji Ozaki
    • Yutaka Okawa
    • Hisashi Yamada
  • View Affiliations / Copyright

    Affiliations: Department of Oncology and Hematology, Jikei University School of Medicine, Minato‑Ku, Tokyo 105‑8471, Japan, Department of Molecular Genetics, Jikei University School of Medicine, Minato‑Ku, Tokyo 105‑8471, Japan, Department of Internal Medicine, Sasaki Hospital, Fukaya, Saitama 366-0824, Japan
    Copyright: © Arakawa et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].
  • Pages: 1053-1058
    |
    Published online on: July 5, 2013
       https://doi.org/10.3892/or.2013.2594
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Abstract

Various anticancer drugs, including camptothecins and indolocarbazoles, target DNA topoisomerase I (Top1). We previously described the camptothecin-resistant colon cancer cell line DLDSNR6, which has a Gly365Ser missense mutation in Top1. In the present study, we established highly camptothecin-resistant sublines from DLDSNR6 cells by continuous exposure to higher camptothecin concentrations. The established sublines grew in the presence of 30 µM of camptothecin, but exhibited markedly retarded growth. In addition to Gly365Ser, these sublines harbored a Top1 Gly717Arg mutation and some had also a Top1 Gln421Arg mutation. Top1 activity was reduced to approximately one-eighth in highly resistant cell lines compared with that in parental DLD-1 cells. Resistant clones with 3 Top1 mutations including Gln421RArg exhibited the highest resistance to the indolocarbazole J-107088 in terms of the effect on the cell cycle distribution. The Gln421 mutation was equivalent to a mutation recently found in camptothecin biosynthesizing plants, but it has not previously been found in mammalian cells.
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Copy and paste a formatted citation
Spandidos Publications style
Arakawa Y, Ozaki K, Okawa Y and Yamada H: Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines. Oncol Rep 30: 1053-1058, 2013.
APA
Arakawa, Y., Ozaki, K., Okawa, Y., & Yamada, H. (2013). Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines. Oncology Reports, 30, 1053-1058. https://doi.org/10.3892/or.2013.2594
MLA
Arakawa, Y., Ozaki, K., Okawa, Y., Yamada, H."Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines". Oncology Reports 30.3 (2013): 1053-1058.
Chicago
Arakawa, Y., Ozaki, K., Okawa, Y., Yamada, H."Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines". Oncology Reports 30, no. 3 (2013): 1053-1058. https://doi.org/10.3892/or.2013.2594
Copy and paste a formatted citation
x
Spandidos Publications style
Arakawa Y, Ozaki K, Okawa Y and Yamada H: Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines. Oncol Rep 30: 1053-1058, 2013.
APA
Arakawa, Y., Ozaki, K., Okawa, Y., & Yamada, H. (2013). Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines. Oncology Reports, 30, 1053-1058. https://doi.org/10.3892/or.2013.2594
MLA
Arakawa, Y., Ozaki, K., Okawa, Y., Yamada, H."Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines". Oncology Reports 30.3 (2013): 1053-1058.
Chicago
Arakawa, Y., Ozaki, K., Okawa, Y., Yamada, H."Three missense mutations of DNA topoisomerase I in highly camptothecin-resistant colon cancer cell sublines". Oncology Reports 30, no. 3 (2013): 1053-1058. https://doi.org/10.3892/or.2013.2594
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