Potent antitumor effects of intra-arterial injection of fibroblasts genetically engineered to express IL-12 in liver metastasis model of rat: No additional benefit of using retroviral producer cell

Takashi Iwazawa, Gar Yang Chau, Takahiro Mori, Keith A. Dookeran, Joshua T. Rubin, Simon Watkins, Paul D. Robbins, Michael T. Lotze, Hideaki Tahara

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Interleukin-12 (IL-12) mediates significant antitumor effects in animal models but associated with dose-dependent toxicity in human. To achieve local expression of IL-12 at the tumor site without systemic toxicity, we performed intra-arterial administration of fibroblasts genetically engineered to produce IL-12 protein with or without retrovirus (CRIP-IL-12 or 3T3-IL-12) in liver metastasis model. Rat breast cancer cells (MADB-106) were injected into the portal vein of syngeneic Fisher rats on day 0, and fibroblasts were injected into the hepatic artery on day 7. On day 21, liver weight and number of liver tumors were examined. As controls, CRIP cells expressing retrovirus carrying lacZ marker gene (CRIP-lacZ) or saline (Hanks balanced salt solution, HBSS) were injected. Administration of CRIP-IL-12 significantly reduced tumor metastasis in liver measured by number of foci (CRIP-IL-12: 45.2±36.7, CRIP-lacZ: >250, HBSS: >250, P<.05) and by liver weight (CRIP-IL-12: 13.0±2.5 g, CRIP-lacZ: 30.4±8.5 g, HBSS: 26.0±7.6 g, P<.05). 3T3-IL-12, which produced only IL-12 protein but not IL-12 retrovirus, also had significant antitumor effects equivalent to CRIP-IL-12. Intra-arterial injection of IL-12-producing fibroblasts into the liver may be an effective therapy for liver tumors reducing systemic toxicity, and could be developed for clinical application.

Original languageEnglish (US)
Pages (from-to)17-22
Number of pages6
JournalCancer gene therapy
Volume8
Issue number1
DOIs
StatePublished - Jan 1 2001
Externally publishedYes

Keywords

  • CRIP cell
  • Fibroblast
  • Gene therapy
  • IL-12
  • Intra-arterial injection
  • Liver tumor

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