Abstract
To increase the antitumor effects of cytosine deaminase (AdCD) gene therapy and induce more potent antitumor immunity, Th1 cytokine interleukin-18 encoded adenovirus (AdIL18) was combined with adenovirus encoding CD (AdCD) for the therapy of established murine B16 melanoma. Combination therapy of the tumor-bearing mice with AdIL18 and AdCD/5FC inhibited the growth of the subcutaneous B16 tumors more significantly, compared with AdIL18 or AdCD/5FC alone. In vivo depletion analysis with anti-CD4, anti-CD8 or anti-NK 1.1 McAb illustrated that both CD8+ T cells and CD4+ T cells played key roles in the augmented antitumor response of the combined therapy. Peptide/MHC tetramer represents a powerful and general tool for rapid, highly sensitive, and direct analysis of antigen-specific T cells. In this study, we prepared H-2Kb/TRP- 2180–188 tetramer, which was demonstrated to bind H-2Kb-restricted, B16 melanoma-specific CD8+T cells. B16 specific H-2Kb/TRP2180–188 tetramer was used to stain the tumor-specific CD8+ T cells and the results showed that CD8+ tetramer+ T cells were about 3–5% of the splenic CD8+ T cells derived from tumor-bearing mice after combined therapy. The CTL cytotoxicity was markedly induced in mice after combined therapy, suggesting efficient induction of tumor-specific CD8+ T cells after combined gene therapy with AdCD/5FC/AdIL18. IL-18 gene transfer could significantly augment the cytotoxicity of NK cells and macrophages, and increase the production of interleukin-2 and interferon-γ, as compared with treatments with AdCD/5FC, AdlacZ/5FC or PBS. These data suggested that in vivo IL-18 gene transfer could augment the antitumor effects of CD suicide gene therapy through efficient induction of antitumor immunity.
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Acknowledgements
This work was supported by grants from the National Natural Science Foundation of China (39600181, 39708173) and National High Biotechnology Foundation of China (96Z032).
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Ju, D., Yang, Y., Tao, Q. et al. Interleukin-18 gene transfer increases antitumor effects of suicide gene therapy through efficient induction of antitumor immunity. Gene Ther 7, 1672–1679 (2000). https://doi.org/10.1038/sj.gt.3301291
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DOI: https://doi.org/10.1038/sj.gt.3301291
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