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The Journal of Immunology, Vol 159, Issue 1 351-359, Copyright © 1997 by American Association of Immunologists
ARTICLES |
L Chen, D Chen, E Block, M O'Donnell, DW Kufe and SK Clinton
Dana-Farber Cancer Institute, Department of Urology, Harvard Medical School, Boston, MA 02115, USA.
IL-12 is a heterodimeric immunoregulatory cytokine composed of covalently linked p40 and p35 subunits and exhibits antitumor activity in a variety of laboratory models. The efficacy of systemically administered cytokines for cancer therapy is often limited by toxicity. The gene therapy approach provides a mechanism to achieve temporary and high local concentrations of cytokines within a tumor with less risk of systemic toxicity. We constructed replication-defective adenoviruses containing the murine IL-12 p40 subunit (Ad.mp40) or a bicistronic vector containing cDNAs for the p40 and p35 subunits (Ad.mIL-12). Murine MB49 bladder cancer cells infected with Ad.mIL-12 secrete high concentrations of biologically active IL-12, while those infected with Ad.mp40 produce the p40 homodimer. Tumors injected with Ad.mIL-12 show rapid increases in IL-12 and IFN-gamma expression over 2 to 5 days and a return to baseline by 7 to 14 days. Injection of tumors with Ad.mIL- 12 (1 x 10(9) plaque-forming units) results in a complete tumor regression in all mice, while those treated with control adenovirus succumb to their tumor. Efficacy is reduced when studies are performed in mice depleted of CD4+ and CD8+ cells or in nude mice. Mice cured of their tumor by Ad.mIL-12 demonstrate specific protective immunity upon rechallenge. Ad.mp40 does not exhibit antitumor activity and may antagonize the activity of rIL-12 or Ad.mIL-12. In summary, gene therapy strategies for cancer using adenoviral vectors containing IL-12 are highly effective with no significant toxicity in mice.
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