BioKnife, a uPA activity-dependent oncolytic sendai virus, eliminates pleural spread of malignant mesothelioma via simultaneous stimulation of uPA expression

Yosuke Morodomi, Tokujiro Yano, Hiroaki Kinoh, Yui Harada, Satoru Saito, Ryoichi Kyuragi, Kumi Yoshida, Mitsuho Onimaru, Fumihiro Shoji, Tsukihisa Yoshida, Kensaku Ito, Yasunori Shikada, Riichiroh Maruyama, Mamoru Hasegawa, Yoshihiko Maehara, Yoshikazu Yonemitsu

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Malignant pleural mesothelioma (MPM) is highly intractable and readily spreads throughout the surface of the pleural cavity, and these cells have been shown to express urokinase-type plasminogen activator receptor (uPAR). We here examined the potential of our new and powerful recombinant Sendai virus (rSeV), which shows uPAR-specific cell-to-cell fusion activity (rSeV/dMFct14 (uPA2), named ′′BioKnife′′), for tumor cell killing in two independent orthotopic xenograft models of human. Multicycle treatment using BioKnife resulted in the efficient rescue of these models, in association with tumor-specific fusion and apoptosis. Such an effect was also seen on both MSTO-211H and H226 cells in vitro; however, we confirmed that the latter expressed uPAR but not uPA. Of interest, infection with BioKnife strongly facilitated the uPA release from H226 cells, and this effect was completely abolished by use of either pyrrolidine dithiocarbamate (PDTC) or BioKnife expressing the C-terminus-deleted dominant negative inhibitor for retinoic acid-inducible gene-I (RIG-IC), indicating that BioKnife-dependent expression of uPA was mediated by the RIG-I/nuclear factor-B (NF-κB) axis, detecting RNA viral genome replication. Therefore, these results suggest a proof of concept that the tumor cell-killing mechanism via BioKnife may have significant potential to treat patients with MPM that is characterized by frequent uPAR expression in a clinical setting.

Original languageEnglish
Pages (from-to)769-777
Number of pages9
JournalMolecular Therapy
Issue number4
Publication statusPublished - Apr 2012


All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Molecular Biology
  • Genetics
  • Pharmacology
  • Drug Discovery

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