TriVax-HPV: an improved peptide-based therapeutic vaccination strategy against human papillomavirus-induced cancers
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Therapeutic vaccines for cancer are an attractive alternative to conventional therapies, since the later result in serious adverse effects and in most cases are not effective against advanced disease. Human papillomavirus (HPV) is responsible for several malignancies such as cervical carcinoma. Vaccines targeting oncogenic viral proteins like HPV16-E6 and HPV16-E7 are ideal candidates to elicit strong immune responses without generating autoimmunity because: (1) these products are not expressed in normal cells and (2) their expression is required to maintain the malignant phenotype. Our group has developed peptide vaccination strategy called TriVax, which is effective in generating vast numbers of antigen-specific T cells in mice capable of persisting for long time periods.
Materials and methods
We have used two HPV-induced mouse cancer models (TC-1 and C3.43) to evaluate the immunogenicity and therapeutic efficacy of TriVax prepared with the immunodominant CD8 T-cell epitope HPV16-E749-57, mixed with poly-IC adjuvant and costimulatory anti-CD40 antibodies.
TriVax using HPV16-E749-57 induced large and persistent T-cell responses that were therapeutically effective against established HPV16-E7 expressing tumors. In most cases, TriVax was successful in attaining complete rejections of 6–11-day established tumors. In addition, TriVax induced long-term immunological memory, which prevented tumor recurrences. The anti-tumor effects of TriVax were independent of NK and CD4 T cells and, surprisingly, did not rely to a great extent on type-I or type-II interferon.
These findings indicate that the TriVax strategy is an appealing immunotherapeutic approach for the treatment of established viral-induced tumors. We believe that these studies may help to launch more effective and less invasive therapeutic vaccines for HPV-mediated malignancies.
KeywordsPeptide vaccines HPV Cervical cancer CD8 T cells PIVAC 11
- αCD40 mAb
Anti-CD40 monoclonal antibodies
Major histocompatibility complex I
We gratefully acknowledge Dr. T-C Wu and Dr. W. M. Kast for providing us with the tumor cell lines and are indebted to Dr. A. Salazar for providing large amounts of Poly-ICLC. We also thank Moffitt Cancer Center Flow Cytometry Core, especially J. Kroger for her help in flow cytometer training. This work was supported by NIH grants R01CA136828 and R01CA157303 to EC.
Conflict of interest
Esteban Celis has filed a patent application based on the use of synthetic peptides and poly-IC combinatorial complexes for vaccination. The rights of the patent application have been transferred to the Moffitt Cancer Center. Kelly Barrios declares no conflict of interest.
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