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. 1993 Jul;67(7):4154–4162. doi: 10.1128/jvi.67.7.4154-4162.1993

Cottontail rabbit papillomavirus L1 protein-based vaccines: protection is achieved only with a full-length, nondenatured product.

Y L Lin 1, L A Borenstein 1, R Ahmed 1, F O Wettstein 1
PMCID: PMC237784  PMID: 7685411

Abstract

Papillomas induced by the cottontail rabbit papillomavirus (CRPV) progress at a high frequency to carcinomas. In this regard, CRPV and its tumors can serve as an animal model for highly oncogenic human papillomaviruses. We have previously shown that immunization with major structural protein L1 elicits neutralizing antibodies and protects rabbits from papilloma development (Y.-L. Lin, L.A. Borenstein, R. Selvakumar, R. Ahmed, and F.O. Wettstein, Virology 187:612-619, 1992). In this study, we demonstrated that vaccination with the TrpE-L1 fusion protein not only protected rabbits from papilloma development but also prevented latent infection. This was indicated by the failure to amplify CRPV sequences by polymerase chain reaction in biopsies from infection sites of immunized animals. Furthermore, we showed that TrpE-L1 immunization protected rabbits from papilloma formation induced by virus but not from that induced by viral DNA. To explore the possibility of developing vaccines based on L1 subfragments, we mapped the linear L1 epitopes recognized by TrpE-L1-immunized rabbits and by virus-infected rabbits resistant to superinfection. Sera from papilloma-bearing rabbits reacted with one major epitope located at the carboxy-terminal end of L1, between amino acids (aa) 480 and 505. A second epitope, and in some animals a third one, was located in the amino-terminal region, between aa 78 and 101, as well as between aa 37 and 62. Sera from TrpE-L1-immunized animals recognized only one major epitope, located between aa 6 and 37. Immunization of rabbits with L1 subfragment fusion proteins led to seroconversion, but no neutralizing antibodies were produced and the animals were not protected against papilloma formation. The data indicate that a successful papillomavirus vaccine must be based on immunization with full-length native L1 and that further simplification to smaller peptides containing major linear epitopes is not feasible.

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Selected References

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