Virus-mediated oncolysis induces danger signal and stimulates cytotoxic T-lymphocyte activity via proteasome activator upregulation

Y. Endo, R. Sakai, M. Ouchi, H. Onimatsu, M. Hioki, S. Kagawa, F. Uno, Y. Watanabe, Y. Urata, N. Tanaka, T. Fujiwara

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59 Citations (Scopus)


Dendritic cells (DCs) are the most potent antigen-presenting cells and acquire cellular antigens and danger signals from dying cells to initiate antitumor immune responses via direct cell-to-cell interaction and cytokine production. The optimal forms of tumor cell death for priming DCs for the release of danger signals are not fully understood. OBP-301 (Telomelysin) is a telomerase-specific replication-competent adenovirus that induces selective E1 expression and exclusively kills human cancer cells. Here, we show that OBP-301 replication produced the endogenous danger signaling molecule, uric acid, in infected human tumor cells, which in turn stimulated DCs to produce interferon-γ (IFN-γ) and interleukin 12 (IL-12). Subsequently, IFN-γ release upregulated the endogenous expression of the proteasome activator PA28 in tumor cells and resulted in the induction of cytotoxic T-lymphocytes. Our data suggest that virus-mediated oncolysis might be the effective stimulus for immature DCs to induce specific activity against human cancer cells.

Original languageEnglish
Pages (from-to)2375-2381
Number of pages7
Issue number17
Publication statusPublished - Apr 10 2008



  • Adenovirus
  • Danger signal
  • Dendritic cell
  • Telomerase
  • Uric acid

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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