Abstract
One of the major hurdles facing cancer immunotherapy is that cancers may downregulate expression of MHC class I molecules. The development of a suitable tumor model with downregulated MHC class I expression is critical for designing vaccines and immunotherapeutic strategies to control such tumors. We developed an E7-expressing murine tumor model with downregulated MHC class I expression, TC-1 P3 (A15). Using this model, we tested DNA and vaccinia vaccines for their ability to control tumors with downregulated MHC class I expression. We found that vaccination with DNA encoding E7 linked to Mycobacterial heat shock protein 70 (HSP70) generated a significant antitumor effect against TC-1 P3 (A15), while vaccination with E7/HSP70 vaccinia did not generate an appreciable antitumor effect. Lymphocyte depletion experiments revealed that both CD8+ T cells and NK cells were essential for the antitumor effect generated by E7/HSP70 DNA against TC-1 P3 (A15). Furthermore, tumor protection experiments using IFN-γ knockout mice revealed that IFN-γ was essential for the antitumor effect generated by E7/HSP70 DNA against TC-1 P3 (A15). Our results demonstrate that vaccination with E7/HSP70 DNA results in a significant antitumor effect against a neoplasm with downregulated MHC class I expression and the importance of CD8+ T cells, NK cells, and IFN-γ in generating this antitumor effect.
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Acknowledgements
We thank Drs Robert Kurman, Drew Pardoll, and Hyam Levitsky for helpful discussions. We also thank Drs Richard Roden and Ralph Hruban for a critical review of the manuscript. We thank The Tetramer Core Facility at NIH for providing PE-labeled E7 (aa 49–57) peptide-H2-Db tetramer. Dr Wen-Fang Cheng (RE88P005) is a recipient of the NHRI physician scientist fellowship award. Dr Cheng is supported by National Science Committee of Taiwan (NSC91-2341-B-002-369) and National Taiwan University Hospital (NTUH 91-F002). Ken-Yu Lin is a Howard Hughes predoctoral fellow.
This work was supported by NIH 5 PO1 34582-01, U19 CA72108-02, RO1 CA72631-01, RO1 CA83706-01, PO1AI48203-01, and American Cancer Society.
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Cheng, W., Hung, C., Lin, K. et al. CD8+ T cells, NK cells and IFN-γ are important for control of tumor with downregulated MHC class I expression by DNA vaccination. Gene Ther 10, 1311–1320 (2003). https://doi.org/10.1038/sj.gt.3301982
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DOI: https://doi.org/10.1038/sj.gt.3301982
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