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- Title
Genetic immunization against cervical carcinoma: induction of cytotoxic T lymphocyte activity with a recombinant alphavirus vector expressing human papillomavirus type 16 E6 and E7.
- Authors
Daemen, T; Pries, F; Bungener, L; Kraak, M; Regts, J; Wilschut, J
- Abstract
Infection of genital epithelial cells with human papillomavirus (HPV) types 16 and 18 is closely associated with the development of cervical carcinoma. The transforming potential of these high-risk HPVs depends on the expression of the E6 and E7 early viral gene products. Since the expression of E6 and E7 is selectively maintained in premalignant and malignant cervical lesions these proteins are attractive candidates for immunotherapeutic and prophylactic strategies. This report describes the construction, characterization and the in vivo immunotherapeutic potential of recombinant Semliki Forest virus (SFV) expressing the HPV16 E6 and E7 proteins (SFV-E6E7). Western blot analysis and immunofluorescence staining demonstrated expression of E6 and E7 in BHK cells infected with SFV-E6E7. Immunization of mice with SFV-E6E7 resulted in an efficient in vivo priming of HPV-specific CTL activity. The induced CTL lysed murine tumor cells transformed with the HPV16 genome and EL4 cells loaded with an immunodominant class I-binding HPV E7 peptide. CTLs could reproducably be induced by immunization with three injections of as few as 10[sup 5] infectious units of SFV-E6E7. Protection from tumor challenge was studied using the tumor ceil line TC-1. Immunization with 5 × 10[sup 6] SFV-E6E7 particles protected 40% of the mice from tumor challenge. These results indicate that E6E7 expression by the efficient and safe recombinant SFV system represents a promising strategy for immunotherapy or immunoprophylaxis of cervical carcinoma.
- Subjects
CERVICAL cancer; CANCER immunotherapy; PAPILLOMAVIRUSES
- Publication
Gene Therapy, 2000, Vol 7, Issue 21, p1859
- ISSN
0969-7128
- Publication type
Article
- DOI
10.1038/sj.gt.3301257