Abstract
Intramuscular (i.m.) injections of a plasmid encoding human carcinoembryonic antigen (CEA) elicited both humoral and cellular immune responses in mice, but only partial inhibition of the growth of transplanted syngeneic CEA-positive P815 tumor cells (CEA/P815). Coinjection of the CEA vector with a vector encoding either interferon-γ (IFNγ) or IL-12 promoted IgG2a isotype anti-CEA antibody production, anti-CEA/P815 CTL activity and greater resistance to CEA/P815 tumor challenge. As well, CEA/P815-stimulated IFNγ secretion in vitro was increased, but IL-4 diminished, consistent with a T-helper type 1 (Th1) response. In contrast, coinjection of the CEA vector with an IL-4 vector increased IgG1 production, but reduced CTL activity and resistance to tumor challenge. The latter treatment inhibited CEA/P815-dependent IFNγ production but enhanced IL-4 secretion, consistent with a Th type 2 (Th2) response. Antitumor immunity was enhanced when the CEA and IL-12 plasmids were coinjected at the same muscle site, but not at separate sites despite increased serum IL-12 levels. Though the tumor cells expressed neomycin phosphotransferase, mice immunized with vectors encoding that protein (without CEA) were not protected against tumor growth, and produced no CTLs except for low levels when coinjected with an IL-12 vector. Thus, we show that immunity elicited by DNA vaccination against CEA can be biased to a protective type (high Th1 and CTL activity) or nonprotective type (high Th2 and low CTL activity) by i.m. coinjection of cytokine-expressing plasmids. IL-12 appears to act locally, but not systemically, through an adjuvant effect.
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Acknowledgements
We thank Dr Abraham Fuks (McGill University, Montreal, Canada) and Dr Serge Jothy (Sunnybrook Hospital, Toronto, Ontario, Canada) for kindly providing reagents and cell lines, Dr Fawaz Halwani (McGill University) for assistance with FACS analyses, and Dr Fu Hu (Montreal General Hospital, Montreal, Canada) for assistance with statistical analyses. This study was funded by the Fraser Fund (Royal Victoria Hospital, Montreal, Canada). Keli Song was supported in part by Royal Victoria Hospital Research Institute Fellowship.
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Song, K., Chang, Y. & Prud'homme, G. Regulation of T-helper-1 versus T-helper-2 activity and enhancement of tumor immunity by combined DNA-based vaccination and nonviral cytokine gene transfer. Gene Ther 7, 481–492 (2000). https://doi.org/10.1038/sj.gt.3301123
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DOI: https://doi.org/10.1038/sj.gt.3301123
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