Open Access

Hepatocellular carcinoma cell sensitivity to Vγ9Vδ2 T lymphocyte-mediated killing is increased by zoledronate

  • Authors:
    • Shiori Sugai
    • Toshiaki Yoshikawa
    • Tatsuaki Iwama
    • Nobuhiro Tsuchiya
    • Norihiro Ueda
    • Norihiro Fujinami
    • Manami Shimomura
    • Rong Zhang
    • Shin Kaneko
    • Yasushi Uemura
    • Tetsuya Nakatsura
  • View Affiliations

  • Published online on: February 19, 2016     https://doi.org/10.3892/ijo.2016.3403
  • Pages: 1794-1804
  • Copyright: © Sugai et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The limited efficacy of vaccines in hepatocellular carcinoma (HCC), due to the low frequency of tumor-infiltrating cytotoxic T lymphocytes (CTLs), indicates the importance of innate immune surveillance, which assists acquired immunity by directly recognizing and eliminating HCC. Innate Vγ9Vδ2 T cells have major histocompatibility complex-unrestricted antitumor activity and are activated by phosphoantigens, which are upregulated in cancer cells by the nitrogen-containing bisphosphonate, zoledronate (Zol). A better understanding of HCC susceptibility to Zol and downstream γδ T cell-mediated killing is essential to optimize γδ T cell-mediated immunotherapy. This study systematically examined the interactions between γδ T cells and Zol-treated HCC cell lines (HepG2, HLE, HLF, HuH-1, JHH5, JHH7, and Li-7) in vitro. All HCC cell lines expressed the DNAX accessory molecule-1 ligands, poliovirus receptor, and Nectin-2, and γδ T cell-mediated killing of these cells was significantly enhanced by Zol. Small interfering RNA-mediated knockdown of these ligands did not affect the susceptibility to γδ T cell lysis. This killing activity was partly inhibited by mevastatin, an inhibitor of the mevalonate pathway, and markedly reduced by a monoclonal antibody to γ- and δ-chain T cell receptor, indicating that this is crucial for Zol-induced HCC killing. In addition, Zol-treated HCC cell lines triggered γδ T cell proliferation and induced production of Th1 and Th2, but not Th17, cytokines. The Zol concentration that enhanced HCC cell susceptibility to γδ T cell killing was lower than that required to directly inhibit HCC proliferation. Thus, γδ T cells may be important effector cells in the presence of Zol, especially where there are insufficient number of cancer antigen-specific CTLs to eliminate HCC. Our in vitro data support the proposal that Zol-treatment, combined with adaptive γδ T cell immunotherapy, may provide a feasible and effective approach for treatment of HCC.
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May-2016
Volume 48 Issue 5

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Sugai S, Yoshikawa T, Iwama T, Tsuchiya N, Ueda N, Fujinami N, Shimomura M, Zhang R, Kaneko S, Uemura Y, Uemura Y, et al: Hepatocellular carcinoma cell sensitivity to Vγ9Vδ2 T lymphocyte-mediated killing is increased by zoledronate. Int J Oncol 48: 1794-1804, 2016.
APA
Sugai, S., Yoshikawa, T., Iwama, T., Tsuchiya, N., Ueda, N., Fujinami, N. ... Nakatsura, T. (2016). Hepatocellular carcinoma cell sensitivity to Vγ9Vδ2 T lymphocyte-mediated killing is increased by zoledronate. International Journal of Oncology, 48, 1794-1804. https://doi.org/10.3892/ijo.2016.3403
MLA
Sugai, S., Yoshikawa, T., Iwama, T., Tsuchiya, N., Ueda, N., Fujinami, N., Shimomura, M., Zhang, R., Kaneko, S., Uemura, Y., Nakatsura, T."Hepatocellular carcinoma cell sensitivity to Vγ9Vδ2 T lymphocyte-mediated killing is increased by zoledronate". International Journal of Oncology 48.5 (2016): 1794-1804.
Chicago
Sugai, S., Yoshikawa, T., Iwama, T., Tsuchiya, N., Ueda, N., Fujinami, N., Shimomura, M., Zhang, R., Kaneko, S., Uemura, Y., Nakatsura, T."Hepatocellular carcinoma cell sensitivity to Vγ9Vδ2 T lymphocyte-mediated killing is increased by zoledronate". International Journal of Oncology 48, no. 5 (2016): 1794-1804. https://doi.org/10.3892/ijo.2016.3403