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Article

Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells

  • Authors:
    • Naoki Makita
    • Itasu Ninomiya
    • Tomoya Tsukada
    • Koichi Okamoto
    • Shinichi Harada
    • Shinichi Nakanuma
    • Seisho Sakai
    • Isamu Makino
    • Jun Kinoshita
    • Hironori Hayashi
    • Katsunobu Oyama
    • Hisatoshi Nakagawara
    • Tomoharu Miyashita
    • Hidehiro Tajima
    • Hiroyuki Takamura
    • Sachio Fushida
    • Tetsuo Ohta
  • View Affiliations / Copyright

    Affiliations: Department of Gastroenterological Surgery, Division of Cancer Medicine, Graduate School of Medical Science, Kanazawa University, Kanazawa 920-8641, Japan, Center for Biomedical Research and Education, School of Medical Science, Kanazawa University, Kanazawa 920-8641, Japan
  • Pages: 1185-1192
    |
    Published online on: June 26, 2015
       https://doi.org/10.3892/or.2015.4089
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Abstract

Radiation therapy is one of the most promising therapeutic strategies in unresectable esophageal squamous cell carcinoma (ESCC). The histone deacetylase (HDAC) inhibitor has been shown to enhance radiosensitivity. Valproic acid (VPA) is a well-known drug used to treat seizure disorders and epilepsy, and has been shown to inhibit HDACs. We recently reported that a clinically safe dose of VPA enhances radiation‑induced cytotoxicity in human ESCC cells. However, the mechanism of radiosensitizing effect of VPA has not yet been confirmed. The present study examined the effect of VPA on DNA double-strand break (DSB) repair after radiation in the human ESCC cell lines KES, TE9 and TE11 by examining H2AX phosphorylation (γH2AX) levels as a marker of radiation‑induced DSBs. The present study also examined whether VPA inhibited radiation-induced DNA DSB repair by suppressing non-homologous end joining (NHEJ), focusing particularly on the acetylation of Ku70. VPA was shown to prolong γH2AX levels after irradiation in all three ESCC cell lines. Moreover, prolonged γH2AX foci formation after irradiation was also observed by immunocytochemistry following VPA pretreatment in KES and TE9 cells. VPA was shown to induce Ku70 acetylation after irradiation in all three ESCC cell lines. Our results suggest that VPA prolonged radiation‑induced DSBs by inhibiting NHEJ in DSB repair pathways in ESCC. VPA could therefore be used as an effective radiosensitizer in ESCC radiotherapy.
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Copy and paste a formatted citation
Spandidos Publications style
Makita N, Ninomiya I, Tsukada T, Okamoto K, Harada S, Nakanuma S, Sakai S, Makino I, Kinoshita J, Hayashi H, Hayashi H, et al: Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells. Oncol Rep 34: 1185-1192, 2015.
APA
Makita, N., Ninomiya, I., Tsukada, T., Okamoto, K., Harada, S., Nakanuma, S. ... Ohta, T. (2015). Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells. Oncology Reports, 34, 1185-1192. https://doi.org/10.3892/or.2015.4089
MLA
Makita, N., Ninomiya, I., Tsukada, T., Okamoto, K., Harada, S., Nakanuma, S., Sakai, S., Makino, I., Kinoshita, J., Hayashi, H., Oyama, K., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells". Oncology Reports 34.3 (2015): 1185-1192.
Chicago
Makita, N., Ninomiya, I., Tsukada, T., Okamoto, K., Harada, S., Nakanuma, S., Sakai, S., Makino, I., Kinoshita, J., Hayashi, H., Oyama, K., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells". Oncology Reports 34, no. 3 (2015): 1185-1192. https://doi.org/10.3892/or.2015.4089
Copy and paste a formatted citation
x
Spandidos Publications style
Makita N, Ninomiya I, Tsukada T, Okamoto K, Harada S, Nakanuma S, Sakai S, Makino I, Kinoshita J, Hayashi H, Hayashi H, et al: Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells. Oncol Rep 34: 1185-1192, 2015.
APA
Makita, N., Ninomiya, I., Tsukada, T., Okamoto, K., Harada, S., Nakanuma, S. ... Ohta, T. (2015). Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells. Oncology Reports, 34, 1185-1192. https://doi.org/10.3892/or.2015.4089
MLA
Makita, N., Ninomiya, I., Tsukada, T., Okamoto, K., Harada, S., Nakanuma, S., Sakai, S., Makino, I., Kinoshita, J., Hayashi, H., Oyama, K., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells". Oncology Reports 34.3 (2015): 1185-1192.
Chicago
Makita, N., Ninomiya, I., Tsukada, T., Okamoto, K., Harada, S., Nakanuma, S., Sakai, S., Makino, I., Kinoshita, J., Hayashi, H., Oyama, K., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Inhibitory effects of valproic acid in DNA double-strand break repair after irradiation in esophageal squamous carcinoma cells". Oncology Reports 34, no. 3 (2015): 1185-1192. https://doi.org/10.3892/or.2015.4089
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