Effective eradication of established murine tumors with IL-12 gene therapy using a polycistronic retroviral vector

Hideaki Tahara, Laurence Zitvogel, Walter J. Storkus, Herbert J. Zeh, Thomas G. McKinney, Robert D. Schreiber, Ueli Gubler, Paul D. Robbins, Michael T. Lotze

Research output: Contribution to journalArticlepeer-review

287 Scopus citations


Our recent studies using IL-12 protein or fibroblasts genetically engineered to secrete IL-12 have demonstrated profound antitumor effects of IL-12 in murine models. The antitumor effects of local, high level IL-12 expression were examined using a retroviral vector, which can express both IL-12 subunits (p35 and p40) and the neomycin phosphotransferase (Neo)- marker gene from a polycistronic message utilizing internal ribosome entry site sequences. All animals intradermally (i.d.) receiving MCA207 murine sarcoma cell line nontransfected or Neo-transfected had progressively growing tumor, whereas all animals injected with MCA207 transfected with IL-12 were tumor free and were subsequently determined to be immune to a rechallenge of nontransfected MCA207 i.d. Similar results were obtained in experiments using the poorly immunogenic MCA102 murine sarcoma cell line. The inoculation of live MCA207-IL-12 tumor cells also caused the regression of contralateral nontransfected MCA207 inoculated either at the same time (80% protection) or up to 3 days before (33% protection) to the therapeutic tumor inoculation. In vivo depletion studies suggest that NK cells and IFN-γ play important roles in the development of the early phase of the antitumor response, but that T cells (both CD4+ and CD8+) play the major role in the subsequent events, leading to long-term immunity. The potent antitumor effects observed for paracrine gene-delivered administration of IL-12 have thus been confirmed for multiple tumor cell types and in multiple murine strains. We believe that these results support the feasibility of IL-12 gene therapy for the treatment of human cancer.

Original languageEnglish (US)
Pages (from-to)6466-6474
Number of pages9
JournalJournal of Immunology
Issue number12
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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