title: DNA vaccines based on chimeric potyvirus-like particles carrying HPV16 E7 peptide (aa 44-60).
abstract: Vaccine strategies for the treatment of human papillomavirus-induced cervical cancer are based mainly on the human papillomavirus 16 E7 (HPV16 E7) oncoprotein. The immunogenicity of the E7 gene has been enhanced by its fusion to many different genes. Here, we linked a short sequence coding for the E7 peptide (aa 44-60) containing immunodominant epitopes for B and T cells to the 3' end of the gene coding for the whole coat protein (CP) of the poty-virus, potato virus A (PVA), and its deleted form (CPdel) with a short C-terminal deletion of 5 amino acids (LGVKG). CP-E7 and CPdel-E7 fusion proteins, just like CP alone, spontaneously assembled into virus-like particles in both procaryotic and eucaryotic cells. The CP-E7 and CPdel-E7 fusion genes induced slightly stronger E7-specific cytotoxic T-lymphocyte responses than the whole E7 gene, although they were still lower than those elicited by the previously constructed fusion gene, Sig/E7GGG/LAMP-1. The E7- and CP-specific antibody responses were not detected in mice vaccinated with CP-E7 and CPdel-E7 fusion genes. The CP-E7 and CPdel-E7 fusion genes protected mice against the development of tumors induced by TC-1 cells producing the E7 antigen and were also effective in the therapeutic setting, i.e. when the vaccination was performed after tumor cell administration. Their antitumor effect was comparable to those of the whole E7 gene and Sig/E7GGG/LAMP-1 fusion gene. There was no relevant difference between immune responses elicited by CP-E7 and CPdel-E7 DNA vaccination.
authors.affiliation: Department of Experimental Virology, Institute of Hematology and Blood Transfusion, U Nemocnice 1, 128 20 Prague 2, Czech Republic. danap@uhkt.cz
authors.forename: Dana
authors.initials: D
authors.lastname: Pokorna
authors.forename: Noemi
authors.initials: N
authors.lastname: Cerovska
authors.forename: Michal
authors.initials: M
authors.lastname: Smahel
authors.forename: Tomas
authors.initials: T
authors.lastname: Moravec
authors.forename: Viera
authors.initials: V
authors.lastname: Ludvikova
authors.forename: Jana
authors.initials: J
authors.lastname: Mackova
authors.forename: Helena
authors.initials: H
authors.lastname: Synkova
authors.forename: Martina
authors.initials: M
authors.lastname: Duskova
authors.forename: Pavel
authors.initials: P
authors.lastname: Hozak
authors.forename: Jiri
authors.initials: J
authors.lastname: Veleminsky
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D019470:Biolistics; D019496:Cancer Vaccines; D002460:Cell Line; D045744:Cell Line, Tumor; D004797:Enzyme-Linked Immunosorbent Assay; D018014:Gene Transfer Techniques; D015316:Genetic Therapy / Q000379:methods*; D006801:Humans; D013058:Mass Spectrometry; D051379:Mice; D008810:Mice, Inbred C57BL; D046529:Microscopy, Electron, Transmission; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D041681:NIH 3T3 Cells; D009368:Neoplasm Transplantation; D009856:Oncogene Proteins, Viral / Q000737:chemistry*; D050725:Papillomavirus E7 Proteins; D010455:Peptides / Q000737:chemistry*; D010957:Plasmids / Q000378:metabolism; D017800:Potyvirus / Q000235:genetics*; D012313:RNA / Q000737:chemistry; D011993:Recombinant Fusion Proteins / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013602:T-Lymphocytes, Cytotoxic / Q000166:cytology; D013997:Time Factors; D019444:Vaccines, DNA
chemical_list: D000970:Antineoplastic Agents; D019496:Cancer Vaccines; D009856:Oncogene Proteins, Viral; D050725:Papillomavirus E7 Proteins; D010455:Peptides; D011993:Recombinant Fusion Proteins; D019444:Vaccines, DNA; C059731:oncogene protein E7, Human papillomavirus type 16; D012313:RNA